Filed pursuant to Rule 424(b)(5)

Under the Securities Act of 1933

Registration No. 333-213864 and

Registration No. 333-213864-01

CALCULATION OF REGISTRATION FEE

Prospectus Supplement

(to Prospectus dated September 29, 2016)

Kilroy Realty, L.P.

$425,000,000

3.450% Senior Notes due 2024

guaranteed by

Kilroy Realty Corporation

The notes will bear interest at the rate of 3.450% per year. Interest on the notes will be payable semi-annually in arrears on June 15 and December 15 of each year, beginning June 15, 2018. The notes will mature on December 15, 2024 unless earlier redeemed as described in this prospectus supplement.

Kilroy Realty, L.P., which we refer to as the operating partnership, may, at its option, redeem the notes at any time in whole or from time to time in part at the applicable redemption price described under “Description of Notes—Redemption of the Notes at the Option of the Operating Partnership” in this prospectus supplement.

The notes will be senior unsecured obligations of the operating partnership and will rank equally in right of payment with all of its other existing and future senior unsecured indebtedness and will be effectively subordinated in right of payment to, among other things, all of its existing and future mortgage indebtedness and other secured indebtedness (to the extent of the value of the collateral securing such indebtedness) and to all existing and future indebtedness and other liabilities of the operating partnership’s subsidiaries, whether secured or unsecured. The notes will be guaranteed by Kilroy Realty Corporation, which we refer to as the Company. The Company has no material assets other than its investment in the operating partnership.

The notes are a new issue of securities with no established trading market. We do not intend to apply for listing of the notes on any securities exchange or for inclusion of the notes in any quotation system.

An investment in the notes involves various risks and prospective investors should carefully consider the matters discussed under “Risk Factors” beginning on page S-6 of this prospectus supplement and the matters discussed in the documents incorporated by reference in this prospectus supplement and the accompanying prospectus before making a decision to invest in the notes.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or passed upon the adequacy or accuracy of this prospectus supplement or the accompanying prospectus. Any representation to the contrary is a criminal offense.

We expect that the notes will be ready for delivery in book-entry form through The Depository Trust Company on or about December 11, 2017.

Joint-Book Running Managers

Senior Co-Managers

Co-Managers

The date of this prospectus supplement is November 27, 2017.

Table of Contents

Prospectus Supplement

Prospectus

Kilroy Realty, L.P., or the operating partnership, is a Delaware limited partnership, and Kilroy Realty Corporation, or the Company or guarantor, is the sole general partner of the operating partnership. Unless otherwise expressly stated or the context otherwise requires, in this prospectus supplement and the accompanying prospectus, “we,” “us” and “our” refer collectively to the Company, the operating partnership and the Company’s other subsidiaries. References in this prospectus supplement to the operating partnership’s revolving credit facility mean the operating partnership’s $750 million unsecured revolving credit facility, and references in this prospectus supplement to the operating partnership’s term loan facility mean the operating partnership’s $150 million unsecured term loan facility with a 12-month delayed draw option (subject to a specified reduction in commitments unless 50% drawn within six months).

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You should rely only on the information contained in this prospectus supplement and the accompanying prospectus, any document incorporated or deemed to be incorporated by reference herein or therein and any free writing prospectus that we may prepare in connection with this offering. Neither we nor the underwriters have authorized anyone to provide you with any information or make any representation that is different. If anyone provides you with any additional or different information, you should not rely on it. Neither this prospectus supplement nor the accompanying prospectus nor any such free writing prospectus is an offer to sell or a solicitation of an offer to buy any securities other than the notes to which this prospectus supplement relates or an offer to sell or the solicitation of an offer to buy securities in any jurisdiction where, or to any person to whom, it is unlawful to make an offer or solicitation. You should not assume that the information contained in this prospectus supplement, the accompanying prospectus, any document incorporated or deemed to be incorporated by reference herein or therein or any free writing prospectus that we may provide you in connection with this offering is accurate on any date after the respective dates of those documents. Our business, financial condition, liquidity, results of operations, funds from operations and prospects may have changed since those respective dates.

Industry and Market Data

In this prospectus supplement and the documents incorporated and deemed to be incorporated by reference in this prospectus supplement and the accompanying prospectus, we refer to information and statistics regarding, among other things, the industry, markets, submarkets and sectors in which we operate, including, among other things, the percentage by which certain leases are above or below applicable market rents and the number of square feet of office and other space that could be developed from specific parcels of undeveloped land. We obtained this information and these statistics from various third-party sources and our own internal estimates. We believe that these sources and estimates are reliable, but this information and these statistics are subject to assumptions, estimates and other uncertainties, and we have not independently verified them and cannot guarantee their accuracy or completeness.

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Risk Factors

Investing in the notes involves risks. Before acquiring any notes pursuant to this prospectus supplement and the accompanying prospectus, you should carefully consider the information contained in this prospectus supplement, the accompanying prospectus, the documents incorporated or deemed to be incorporated by reference herein or therein and any free writing prospectus that we may prepare in connection with this offering, including, without limitation, the risks set forth below and under the captions (or similar captions) “Item 1A. Risk Factors” and “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations” in Kilroy Realty Corporation’s and Kilroy Realty, L.P.’s Annual Report on Form 10-K for the year ended December 31, 2016, under the caption “Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations” in Kilroy Realty Corporation’s and Kilroy Realty, L.P.’s subsequent Quarterly Reports on Form 10-Q and as described in other filings of Kilroy Realty Corporation and Kilroy Realty, L.P. with the Securities Exchange Commission, or SEC. The occurrence of any of these risks could materially and adversely affect our business, financial condition, liquidity, results of operations, funds from operations and prospects, as well as the trading price of the notes, and might cause you to lose all or a part of your investment in the notes. Please also refer to the section in this prospectus supplement entitled “Forward-Looking Statements.”

Risks Related to this Offering and the Notes

The effective subordination of the notes may limit our ability to satisfy our obligations under the notes.

The notes will be the operating partnership’s senior unsecured obligations and will rank equally in right of payment with all of its other existing and future senior unsecured indebtedness. The notes will be effectively subordinated in right of payment to:

Similarly, the Company’s guarantee of the notes will be its senior unsecured obligation and will rank equally in right of payment with all of its other existing and future senior unsecured indebtedness and guarantees. The Company’s guarantee of the notes will be effectively subordinated in right of payment to:

The indenture that will govern the notes will not prohibit the operating partnership, the Company or any of their respective subsidiaries from incurring secured or unsecured indebtedness in the future and, although the

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indenture will contain covenants that will limit the ability of the operating partnership and its subsidiaries to incur secured and unsecured indebtedness, those covenants are subject to significant exceptions and limitations, and in any event the operating partnership and its subsidiaries may be able, without taking advantage of any such exceptions and limitations, to incur substantial amounts of additional secured and unsecured indebtedness without violating those covenants. Moreover, these covenants limiting the incurrence of indebtedness will not apply to the Company. For additional information, see “Description of Notes—Certain Covenants.”

In the event of the bankruptcy, liquidation, reorganization or other winding up of the operating partnership or the Company, assets that secure any of their respective secured indebtedness, secured guarantees and other secured obligations will be available to pay their respective obligations under the notes or the guarantee of the notes, as applicable, and their other respective unsecured indebtedness, unsecured guarantees and other unsecured obligations only after all of their respective indebtedness, guarantees and other obligations secured by those assets has been repaid in full, and we caution you that there may not be sufficient assets remaining to pay amounts due on any or all the notes or the guarantee of the notes, as the case may be, then outstanding. In the event of the bankruptcy, liquidation, reorganization or other winding up of any of subsidiaries of the operating partnership or the Company, the rights of holders of indebtedness and other obligations of the operating partnership (including the notes) or the Company (including its guarantee of the notes), as the case may be, will be effectively subordinated to the prior claims of that subsidiary’s creditors and of the holders of any indebtedness or other obligations guaranteed by that subsidiary, except to the extent that the operating partnership or the Company is itself a creditor with recognized claims against that subsidiary, in which case those claims would still be effectively subordinated to all debt secured by mortgages or other liens on the assets of that subsidiary (to the extent of the value of those assets) and would be subordinate to all indebtedness of that subsidiary senior to that held by the operating partnership or the Company, as the case may be. Moreover, in the event of the bankruptcy, liquidation, reorganization or other winding up of any subsidiary of the operating partnership or the Company, the rights of holders of indebtedness and other obligations of the operating partnership (including the notes) or the Company (including its guarantee of the notes), as the case may be, will be effectively subordinated to any equity interests in that subsidiary held by persons other than the operating partnership or the Company, as the case may be. In addition, in the event of the bankruptcy, liquidation, reorganization or other winding up of any subsidiary of the operating partnership or the Company, or of any other entity that the operating partnership or the Company accounts for using the equity method of accounting, the rights of holders of indebtedness and other obligations of the operating partnership (including the notes) or the Company (including its guarantee of the notes), as the case may be, will be subject to the prior claims of that entity’s creditors and the holders of any indebtedness or other obligations of that entity, except to the extent that the operating partnership or the Company, as the case may be, is itself a creditor with recognized claims against that entity, in which case those claims would still be effectively subordinated to all debt secured by mortgages or other liens on the assets of that entity (to the extent of the value of those assets) and would be subordinate to all indebtedness of that entity senior to that held by the operating partnership or the Company, as the case may be.

As of September 30, 2017, the operating partnership (excluding its subsidiaries) had approximately $1,985.0 million aggregate principal amount of outstanding indebtedness (before the impact of $9.6 million of unamortized deferred financing costs and $6.0 million of unamortized discounts for its unsecured senior notes), and had approximately $690.0 million of borrowing capacity available (subject to customary conditions) under its $750.0 million revolving credit facility and $150.0 million of borrowing capacity available (subject to customary conditions) under its term loan facility. In addition, the operating partnership may elect to increase its total borrowing capacity (subject to receiving additional lender commitments and customary conditions) under its revolving credit facility and/or term loan facility by up to $600.0 million in the aggregate for a maximum borrowing capacity of $1.5 billion. As of September 30, 2017, the Company (excluding its subsidiaries) had no outstanding indebtedness and had guaranteed the operating partnership’s borrowings and other amounts due under the operating partnership’s revolving credit facility and term loan facility and other outstanding indebtedness of the operating partnership totaling approximately $1,985.0 million aggregate principal amount (before the impact of the unamortized deferred financing costs and the unamortized discounts for the unsecured senior notes referred to above). As of September 30, 2017, the subsidiaries of the operating partnership and the

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subsidiaries of the Company (excluding the operating partnership) had approximately $464.0 million of outstanding indebtedness (before the impact of $3.0 million of unamortized premiums) and no outstanding unsecured indebtedness, in addition to their trade payables and other liabilities. In addition, as of September 30, 2017, the subsidiaries of the operating partnership and the subsidiaries of the Company did not guarantee any indebtedness of the operating partnership or the Company.

We may not be able to meet our debt service obligations.

Our ability to make payments on and to refinance our indebtedness, including the notes, and to fund our operations, working capital and capital expenditures, depends on our ability to generate cash in the future. Our cash flow is subject to general economic, industry, financial, competitive, operating, legislative, regulatory and other factors, many of which are beyond our control.

The instruments and agreements governing some of our outstanding indebtedness (including borrowings under the operating partnership’s revolving credit facility and term loan facility) contain provisions that require us to repay that indebtedness under specified circumstances or upon the occurrence of specified events (including certain changes of control of the Company or in the composition of its board of directors or if the Company or one of its wholly-owned subsidiaries ceases to be the sole general partner of the operating partnership or the Company ceases to own, directly or indirectly, at least 60% of the voting equity interests in the operating partnership) and our future debt agreements and debt securities may contain similar provisions or may require that we repurchase or offer to repurchase the applicable indebtedness for cash under specified circumstances or upon the occurrence of specified changes of control of the Company or the operating partnership or other events. We may not have sufficient funds to pay our indebtedness when due (including upon any such required repurchase, repayment or offer to repurchase), and we may not be able to arrange for the financing necessary to make those payments on favorable terms or at all. In addition, our ability to make required payments on our indebtedness when due (including upon any such required repurchase, repayment or offer to repurchase) may be limited by the terms of other debt instruments or agreements. Our failure to pay amounts due in respect of any of our indebtedness when due would generally constitute an event of default under the instrument governing that indebtedness, which could permit the holders of that indebtedness to require the immediate repayment of that indebtedness in full and, in the case of secured indebtedness, could allow them to sell the collateral securing that indebtedness and use the proceeds to repay that indebtedness. Moreover, any acceleration of or default in respect of any of our indebtedness could, in turn, constitute an event of default under other debt instruments or agreements, thereby resulting in the acceleration and required repayment of that other indebtedness. Any of these events could materially adversely affect our ability to make payments of principal and interest on the notes when due and could prevent us from making those payments altogether.

We cannot assure you that our business will generate sufficient cash flow from operations or that future sources of cash will be available to us in an amount sufficient to enable us to pay amounts due on our indebtedness, including the notes, or to fund our other liquidity needs, including cash distributions to stockholders necessary to maintain the Company’s REIT qualification. Additionally, if we incur additional indebtedness in connection with future acquisitions or for any other purpose, our debt service obligations could increase.

We may need to refinance all or a portion of our indebtedness, including the notes, on or before maturity. Our ability to refinance our indebtedness or obtain additional financing will depend on, among other things:

As a result, we may not be able to refinance our indebtedness, including the notes, on commercially reasonable terms or at all. If we do not generate sufficient cash flow from operations, and additional borrowings or refinancings or proceeds of asset sales or other sources of cash are not available to us, we may not have

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sufficient cash to enable us meet all of our obligations, including payments on the notes. Accordingly, if we cannot service our indebtedness, we may have to take actions such as seeking additional equity financing, delaying capital expenditures, or strategic acquisitions and alliances.

Any of these events or circumstances could have a material adverse effect on our financial condition, results of operations, cash flows, the trading price of our securities (including the notes) and our ability to satisfy our debt service obligations and to pay dividends and distributions to our security holders. In addition, foreclosures could create taxable income without accompanying cash proceeds, which could require us to borrow or sell assets to raise the funds necessary to pay amounts due on our indebtedness, including the notes, and to meet the REIT distribution requirements, even if such actions are not on favorable terms.

Despite our substantial indebtedness, we may still incur significantly more debt, which could exacerbate the risks related to our indebtedness, and adversely impact our ability to pay the principal of or interest on the notes.

We may be able to incur substantial additional indebtedness in the future. Although the agreements governing our secured and unsecured indebtedness limit, and the indenture governing the notes will limit, our ability to incur additional indebtedness, these restrictions are subject to a number of significant exceptions and, in addition, we will have the ability to incur additional indebtedness, which could be substantial, without violating the limitations imposed by these debt instruments. To the extent we incur additional indebtedness, we may face additional risks associated with our indebtedness, including our possible inability to pay the principal of and interest on the notes.

The Company has no significant operations, other than as the operating partnership’s general partner, and no material assets, other than its investment in the operating partnership.

The notes will be guaranteed by the Company. However, the Company has no significant operations, other than as general partner of the operating partnership, and no material assets, other than its investment in the operating partnership. Accordingly, if the operating partnership fails to make a payment on the notes when due, there can be no assurance that the Company would have funds to pay that amount pursuant to its guarantee. Furthermore, as described above under “—The effective subordination of the notes may limit our ability to satisfy our obligations under the notes,” the Company’s guarantee will be effectively subordinated in right of payment to:

Federal and state laws allow courts, under specific circumstances, to void guarantees and require holders of guaranteed debt to return payments received from guarantors.

Under the federal bankruptcy law and comparable provisions of state fraudulent transfer laws, a court could void the guarantee of the notes provided by the Company or could subordinate the guarantee to all other debts and guarantees of the Company if, among other things, the Company, at the time it incurred or entered into its guarantee of the notes, received less than reasonably equivalent value or fair consideration for the incurrence of the guarantee and any of the following is also true:

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In addition, under any of the circumstances described above, any payment by the Company pursuant to its guarantee of the notes could be voided and holders of the notes could be required to return those payments to the Company or to a fund for the benefit of the creditors of the Company.

The measures of insolvency for purposes of these fraudulent transfer laws will vary depending upon the law applied in any proceeding to determine whether a fraudulent transfer has occurred. Generally, however, a guarantor would be considered insolvent if:

Moreover, a court might also void the Company’s guarantee of the notes, without regard to the above factors, if it found that the Company entered into its guarantee with actual or deemed intent to hinder, delay, or defraud its creditors.

We cannot be certain as to the standards a court would use to determine whether reasonably equivalent value or fair consideration was received by the Company for its guarantee of the notes. If a court voided such guarantee, holders of the notes would no longer have a claim against the Company under such guarantee. In addition, the court might direct holders of the notes to repay any amounts already received from the Company under its guarantee.

If the court were to void the Company’s guarantee, require the return of monies paid by the Company under its guarantee or subordinate the guarantee to other obligations of the Company, we could not assure you that funds to pay the notes would be available from the operating partnership or any of our other subsidiaries or from any other source.

There is currently no trading market for the notes, and an active public trading market for the notes may not develop or, if it develops, be maintained or be liquid. The failure of an active public trading market for the notes to develop or be maintained is likely to adversely affect the market price and liquidity of the notes.

The notes are a new issue of securities with no established trading market. We do not intend to apply for listing of the notes on any securities exchange or for inclusion in any quotation system. Although the underwriters have advised us that they intend to make a market in the notes, they are not obligated to do so and may discontinue any market-making at any time without notice. Accordingly, an active public trading market may not develop for the notes and, even if one develops, may not be maintained or be liquid. If an active public trading market for the notes does not develop or is not maintained, the market price and liquidity of the notes are likely to be adversely affected and holders may not be able to sell their notes at desired times and prices or at all. If any of the notes are traded after their purchase in this offering, they may trade at a discount, which could be substantial, from their purchase price.

The liquidity of the trading market, if any, and future trading prices of the notes will depend on many factors, including, among other things, prevailing interest rates, the financial condition, results of operations, business, prospects and credit quality of the operating partnership and its subsidiaries and the Company and its

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subsidiaries and other comparable entities, the market for similar securities and the overall securities markets, and may be adversely affected by unfavorable changes in any of these factors, many of which are beyond our control. In addition, market volatility or events or developments in the credit markets could materially and adversely affect the market value of the notes, regardless of the operating partnership’s, the Company’s or their respective subsidiaries’ financial condition, results of operations, business, prospects or credit quality.

The market price of the notes may fluctuate significantly.

The market price of the notes may fluctuate significantly in response to many factors, including:

Many of the factors listed above are beyond our control. These factors may cause the market price of the notes to decline, regardless of our financial condition, results of operations, business or prospects. We cannot assure you that the market price of the notes will not fall in the future, and it may be difficult for investors to resell the notes at prices they find attractive, or at all.

Holders of the notes will not be entitled to require us to redeem or repurchase the notes upon the occurrence of change of control or highly levered transactions or other designated events.

As of September 30, 2017, we had $60.0 million principal amount of indebtedness outstanding under the operating partnership’s $750.0 million revolving credit facility, and we had $690.0 million of borrowing capacity available (subject to customary conditions) under the revolving credit facility. As of September 30, 2017, we had no outstanding indebtedness under the operating partnership’s term loan facility, and we had $150.0 million of borrowing capacity available (subject to customary conditions) under the term loan facility. In addition, the operating partnership may elect to increase its total borrowing capacity (subject to receiving additional lender

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commitments and customary conditions) under its revolving credit facility and/or term loan facility by up to $600.0 million in the aggregate for a maximum borrowing capacity of $1.5 billion. These facilities include provisions that permit the lenders to demand immediate repayment of all borrowings outstanding thereunder upon the acquisition by any person or group of more than a specified percentage of the aggregate voting power of all of the Company’s issued and outstanding voting stock, upon certain changes in the composition of a majority of the members of the Company’s board of directors or if the Company or one of its wholly-owned subsidiaries ceases to be the sole general partner of the operating partnership or the Company ceases to own, directly or indirectly, at least 60% of the voting equity interests in the operating partnership, and debt instruments that the Company or the operating partnership may enter into in the future may contain similar provisions requiring us to repay or offer to repay or repurchase all borrowings thereunder upon the occurrence of similar events or circumstances. However, the notes offered hereby do not have any similar rights to require us to repurchase or repay the notes, whether upon the occurrence of a change of control or highly leveraged transaction or otherwise, even though these transactions could increase the amount of our indebtedness or otherwise adversely affect our capital structure or credit ratings, thereby adversely affecting the market value of the notes. These provisions may also allow holders of that other indebtedness to be repaid upon the occurrence of specified transactions or events, which may deplete our available cash and sources of financing and make it difficult or impossible for us to make payments on the notes when due.

An increase in interest rates could result in a decrease in the market value of the notes.

In general, as market interest rates rise, notes bearing interest at a fixed rate generally decline in value. Consequently, if you purchase these notes and market interest rates increase, the market value of your notes may decline. We cannot predict the future level of market interest rates.

A downgrade in our credit ratings could materially adversely affect our business and financial condition and the market value of the notes.

The credit ratings assigned to the notes and other debt securities of the operating partnership could change based upon, among other things, our results of operations and financial condition. These ratings are subject to ongoing evaluation by credit rating agencies, and we cannot assure you that any rating will not be changed or withdrawn by a rating agency in the future if, in its judgment, circumstances warrant. Moreover, these credit ratings are not recommendations to buy, sell or hold the notes or any other securities. If any of the credit rating agencies that have rated the notes or other debt securities of the operating partnership downgrades or lowers its credit rating, or if any credit rating agency indicates that it has placed any such rating on a so- called “watch list” for a possible downgrading or lowering or otherwise indicates that its outlook for that rating is negative, it could have a material adverse effect on the market value of the notes and our costs and availability of capital, which could in turn have a material adverse effect on our financial condition, results of operations, cash flows and our ability to satisfy our debt service obligations (including payments on the notes) and to make dividends and distributions to our security holders and could also have the material adverse effect on the market value of the notes.

The notes are subject to early redemption.

As described under “Description of Notes—Redemption of the Notes at the Option of the Operating Partnership,” the operating partnership may, at its option, redeem the notes offered hereby at any time in whole or from time to time in part at the redemption prices described under such caption. Consequently, the operating partnership may choose to redeem your notes at times when prevailing interest rates are lower than the effective interest rate paid on your notes. If that were to occur, you may be unable to reinvest your redemption proceeds in an investment with a return that is as high as the return you would have earned on the notes had they not been redeemed and that presents a similar level of investment risk as the notes.

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Recently proposed tax legislation may affect your investment in the notes.

Congress has recently proposed legislation that would significantly reform U.S. tax laws. As of the date of this prospectus supplement, it is unclear how and to what extent the proposed tax legislation may be amended and whether Congress will ultimately enact any such legislation. If enacted, the legislation could alter the tax consequences of investing in the notes. This prospectus supplement does not discuss any such proposed tax legislation or the manner in which it might affect purchasers of the notes. Investors are urged to consult with their own legal and tax advisors with respect to any such legislation and the potential tax consequences of investing in the notes.

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Forward-Looking Statements

This prospectus supplement and the accompanying prospectus, including the documents incorporated by reference herein or therein, contain, and documents we subsequently file with the SEC and incorporate by reference herein or therein may contain, certain “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, or the Securities Act, and Section 21E of the Securities Exchange Act of 1934, as amended, or the Exchange Act, including, among other things, statements or information concerning our plans, objectives, capital resources, portfolio performance, results of operations, projected future occupancy and rental rates, lease expirations, debt maturities, potential investments, strategies such as capital recycling, development and redevelopment activity, projected construction costs, projected construction commencement and completion dates, projected square footage of office space that could be constructed on undeveloped land that we own, projected rentable square footage of or number of units in properties under construction or in the development pipeline, anticipated proceeds from capital recycling activity or other dispositions and anticipated dates of those activities or dispositions, projected increases in the value of properties, dispositions, future executive incentive compensation, pending, potential or proposed acquisitions, the anticipated use of proceeds from this offering, plans to grow our net operating income and funds from operations, our ability to re-lease properties at or above current market rates, anticipated market conditions and demographics and other forward-looking financial data. Forward-looking statements can be identified by the use of words such as “believes,” “expects,” “projects,” “may,” “will,” “should,” “seeks,” “approximately,” “intends,” “plans,” “pro forma,” “estimates” or “anticipates” and the negative of these words and phrases and similar expressions that do not relate to historical matters. Forward-looking statements are based on our current expectations, beliefs and assumptions, and are not guarantees of future performance. Forward-looking statements are inherently subject to uncertainties, risks, changes in circumstances, trends and factors that are difficult to predict, many of which are outside of our control. Accordingly, actual performance, results and events may vary materially from those indicated in the forward-looking statements, and you should not rely on the forward-looking statements as predictions of future performance, results or events. Numerous factors could cause actual future performance, results and events to differ materially from those indicated in the forward-looking statements, including, among others:

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The risk factors included in this prospectus supplement and the accompanying prospectus, including the documents incorporated by reference herein or therein, and documents we subsequently file with the SEC and incorporate by reference herein or therein, are not exhaustive and additional factors could adversely affect our business and financial performance. For a discussion of additional factors that could materially adversely affect the Company’s and operating partnership’s business and financial performance, see the factors included under the caption “Risk Factors” in this prospectus supplement, in the accompanying prospectus, in the Company’s and the operating partnership’s Annual Report on Form 10-K for the year ended December 31, 2016, as well as the other risks described in this prospectus supplement and the accompanying prospectus and the documents incorporated by reference herein or therein. All forward-looking statements are based on information that was available and speak only as of the date on which they were made. We assume no obligation to update any forward-looking statement that becomes untrue because of subsequent events, new information or otherwise, except to the extent we are required to do so in connection with our ongoing requirements under federal securities laws.

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Consolidated Ratio of Earnings to Fixed Charges

Kilroy Realty Corporation’s consolidated ratio of earnings to fixed charges for each of the periods indicated was as follows:

We have computed the consolidated ratio of earnings to fixed charges for Kilroy Realty Corporation by dividing earnings by fixed charges. Earnings consist of income (loss) from continuing operations before the effect of noncontrolling interest plus fixed charges and amortization of capitalized interest, reduced by capitalized interest and loan costs and distributions on the operating partnership’s cumulative redeemable preferred units. Fixed charges consist of interest costs, whether expensed or capitalized, amortization of loan costs, an estimate of the interest within rental expense, and distributions on the operating partnership’s cumulative redeemable preferred units. Amortization of capitalized interest represents an estimate of capitalized interest that has been amortized each year based on the Company’s established depreciation policy and an analysis of total interest costs and loan costs capitalized since 1997.

The computation of the ratio of earnings to fixed charges indicates that earnings were inadequate to cover fixed charges, calculated as described above, by approximately $14.6 million and $23.5 million for the years ended December 31, 2013 and 2012, respectively.

Kilroy Realty, L.P.’s consolidated ratio of earnings to fixed charges for each of the periods indicated was as follows:

We have computed the consolidated ratio of earnings to fixed charges for Kilroy Realty, L.P. by dividing earnings by fixed charges. Earnings consist of income (loss) from continuing operations before the effect of noncontrolling interest plus fixed charges and amortization of capitalized interest, reduced by capitalized interest and loan costs. Fixed charges consist of interest costs, whether expensed or capitalized, amortization of loan costs and an estimate of the interest within rental expense. Amortization of capitalized interest represents an estimate of capitalized interest that has been amortized each year based on the operating partnership’s established depreciation policy and an analysis of total interest costs and loan costs capitalized since 1997.

The computation of the ratio of earnings to fixed charges indicates that earnings were inadequate to cover fixed charges, calculated as described above, by approximately $14.6 million and $19.9 million for the years ended December 31, 2013 and 2012, respectively.

We adopted Accounting Standards Update No. 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity, effective January 1, 2015. As a result, properties classified as held for sale and/or disposed of subsequent to January 1, 2015 that do not represent a strategic shift are no longer presented as discontinued operations. In accordance with the accounting pronouncement, we adopted the guidance on a prospective basis. Therefore, earnings presented prior to adoption do not include the results of operations for properties classified as held for sale and/or disposed of prior to January 1, 2015.

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Use of Proceeds

We expect that net proceeds from this offering will be approximately $421.0 million after deducting the underwriting discount and our estimated expenses. We intend to use the net proceeds from this offering to redeem all $325.0 million aggregate principal amount (plus the make-whole amount and accrued and unpaid interest) of the operating partnership’s 2018 Notes and to use the remaining net proceeds for general corporate purposes, which may include funding development projects, acquiring land and properties and repaying other outstanding indebtedness. Pending application of the net proceeds for those purposes, we may use the net proceeds from this offering to repay borrowings under the operating partnership’s revolving credit facility and/or temporarily invest such net proceeds in marketable securities. The 2018 Notes bear interest at the rate of 4.800% per annum and mature on July 15, 2018. As of November 22, 2017, we had $30.0 million principal amount of indebtedness outstanding under the revolving credit facility. On November 21, 2017, the operating partnership made a $55.0 million draw request under the revolving credit facility that we expect will be funded on November 28, 2017. The revolving credit facility matures in July 2022 and, as of November 22, 2017, bore interest at a rate equal to the London Interbank Offered Rate, or LIBOR, plus 1.000%. Proceeds from borrowings under the revolving credit facility were applied for general corporate purposes, including acquiring properties, funding development and redevelopment projects and repaying indebtedness. Any borrowings under the revolving credit facility that are repaid with net proceeds from this offering may be reborrowed, subject to customary conditions.

To the extent that any of the underwriters or their affiliates own any of the operating partnership’s 2018 Notes, they may receive proceeds from this offering through the redemption of those 2018 Notes. In addition, affiliates of some or all of the underwriters are lenders under the operating partnership’s revolving credit facility and term loan facility. As described above, net proceeds of this offering may be used to repay borrowings under the revolving credit facility and other indebtedness. Because affiliates of some or all of the underwriters are lenders under the revolving credit facility, to the extent that net proceeds from this offering are applied to repay borrowings under the revolving credit facility, such affiliates will receive proceeds of this offering through the repayment of those borrowings. Likewise, to the extent that the underwriters or any of their affiliates hold other indebtedness that is repaid with net proceeds from this offering, they will receive proceeds from this offering through the repayment of that indebtedness. If 5% or more of the net proceeds of this offering (not including the underwriting discount) is used to repay indebtedness owed to at least one of the underwriters and/or affiliates of such underwriter, this offering will be conducted in accordance with FINRA Rule 5121. In such event, such underwriter or underwriters may not confirm sales of the notes to accounts over which they exercise discretionary authority without the prior written approval of the customer. See “Underwriting (Conflicts of Interest)—Conflicts of Interest.”

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Description of Notes

The notes will be issued pursuant to an indenture dated as of March 1, 2011 (the “base indenture”), as amended and supplemented by a supplemental indenture dated as of July 5, 2011 (the “supplemental indenture”; the base indenture, as amended and supplemented by the supplemental indenture, is referred to in this prospectus supplement as the “indenture”), in each case among the operating partnership, as issuer, the Company, as guarantor, and U.S. Bank National Association, as trustee. The terms of the notes include those stated in the indenture and those made part of the indenture by reference to the Trust Indenture Act of 1939, as amended.

The notes will be a series of “debt securities” referred to in the accompanying prospectus. The following description of some of the provisions of the notes and the indenture supplements, and to the extent inconsistent supersedes and replaces, the description of some of the general provisions of the debt securities and the indenture contained in the accompanying prospectus. The following description of some of the provisions of the notes, the officers’ certificate establishing certain terms of the notes and the indenture and the description of some of the general provisions of the debt securities and the indenture contained in the accompanying prospectus are not complete and are subject to, and qualified in their entirety by reference to, the forms of the notes and indenture which have been or will be filed as exhibits to the registration statement of which the accompanying prospectus is a part and which may be obtained as described under “Where You Can Find More Information” in the accompanying prospectus. We urge you to read those documents in their entirety because they, and not this description nor the description in the accompanying prospectus, define your rights as a holder of notes. You may request a copy of those documents from us as described in “Where You Can Find More Information” in the accompanying prospectus.

As used in this “Description of Notes” and in the “Description of Debt Securities and Related Guarantees” in the accompanying prospectus, references to the “operating partnership,” “we,” “our” or “us” refer solely to Kilroy Realty, L.P. and not to any of its subsidiaries and references to the “Company” or “guarantor” refer solely to Kilroy Realty Corporation and not to any of its subsidiaries, unless otherwise expressly stated or the context otherwise requires.

General

The notes:

The notes will constitute a single series of debt securities under the indenture and will initially be limited to an aggregate principal amount of $425,000,000. The operating partnership may, without the consent of or notice

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to the holders of the notes, increase the principal amount of the notes by issuing additional notes of this series from time to time in the future. Any such additional notes will have the same terms and provisions as the notes offered hereby, except for any difference in issue date, issue price, date from which interest will begin to accrue, interest accrued prior to the issue date and first interest payment date of those additional notes. The notes offered hereby and any additional notes of this series that the operating partnership may issue in the future will vote and act together as a single series of debt securities under the indenture, which means that, in circumstances where the indenture provides for holders of the notes of this series to vote or take any action, the notes offered hereby and any additional notes of this series that the operating partnership may issue in the future will vote or take that action as a single series.

Except to the extent described below under “—Certain Covenants” and in the accompanying prospectus under “Description of Debt Securities and Related Guarantees—Merger, Consolidation and Sale of Assets,” the indenture governing the notes does not prohibit the operating partnership or the Company or any of the operating partnership’s or the Company’s subsidiaries from incurring additional indebtedness or issuing preferred equity in the future, nor does the indenture afford holders of the notes protection in the event of (1) a recapitalization or other highly leveraged or similar transaction involving the operating partnership or the Company, (2) a change of control of the operating partnership or the Company or (3) a merger, consolidation, reorganization, restructuring or transfer or lease of all or substantially all of the operating partnership’s or the Company’s assets or similar transactions that may adversely affect the holders of the notes. The operating partnership or the Company may, in the future, enter into certain transactions, such as the sale of all or substantially all of the operating partnership’s or the Company’s assets or a merger or consolidation, that may increase the amount of the operating partnership’s or the Company’s indebtedness or substantially change the operating partnership’s or the Company’s assets, which may have a material adverse effect on the operating partnership’s ability to service its indebtedness, including the notes, or on the Company’s ability to pay amounts due under its guarantees of the notes. Furthermore, the notes and the indenture do not include any provisions that would allow holders of the notes to require the operating partnership or the Company to repurchase or redeem the notes in the event of a transaction of the nature described above. See “Risk factors—Risks Related to this Offering and the Notes—The effective subordination of the notes may limit our ability to satisfy our obligations under the notes” and “Risk Factors—Risk Related to this Offering and the Notes—Holders of the notes will not be entitled to require us to redeem or repurchase the notes upon the occurrence of change of control or highly leveraged transactions or other designated events.”

The operating partnership does not intend to apply to list the notes on any securities exchange or include them on any quotation system.

Interest

Interest on the notes will accrue at the rate of 3.450% per year from and including December 11, 2017 or the most recent interest payment date to which interest has been paid or provided for, and will be payable semi-annually in arrears on June 15 and December 15 of each year, beginning June 15, 2018. The interest so payable will be paid to each holder in whose name a note is registered at the close of business on the June 1 or December 1 (whether or not a business day) immediately preceding the applicable interest payment date. Interest on the notes will be computed on the basis of a 360- day year consisting of twelve 30-day months.

Ranking

The notes will be the operating partnership’s senior unsecured obligations and will rank equally in right of payment with all of the operating partnership’s other existing and future senior unsecured indebtedness. The notes will be effectively subordinated in right of payment to:

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The indenture that will govern the notes will not prohibit the operating partnership, the Company or any of their respective subsidiaries from incurring secured or unsecured indebtedness in the future and, although the indenture will contain covenants that will limit the ability of the operating partnership and its subsidiaries to incur secured and unsecured indebtedness, those covenants are subject to significant exceptions and the operating partnership and its subsidiaries may be able to incur substantial amounts of additional secured and unsecured indebtedness without violating those covenants.

For additional information, see “Risk Factors—Risks Related to this Offering and the Notes—The effective subordination of the notes may limit our ability to satisfy our obligations under the notes.”

Company Guarantee

The Company will guarantee the operating partnership’s obligations under the notes, including the due and punctual payment of principal of and premium, if any, and interest on the notes, whether at stated maturity, upon acceleration, upon redemption or otherwise. Under the terms of the Company’s guarantee, holders of the notes will not be required to exercise their remedies against the operating partnership before they proceed directly against the Company. The Company’s obligations under the guarantee of the notes will be limited to the maximum amount that will not, after giving effect to all other contingent and fixed liabilities of the Company, result in the guarantee constituting a fraudulent transfer or conveyance. See “Risk factors—Risks Related to this Offering and the Notes—Federal and state laws allow courts, under specific circumstances, to void guarantees and require holders of guaranteed debt to return payments received from guarantors.”

The guarantee of the notes will be a senior unsecured obligation of the Company and will rank equally in right of payment with all other existing and future senior unsecured indebtedness and guarantees of the Company. The Company’s guarantee of the notes will be effectively subordinated in right of payment to:

The covenants in the indenture that will limit the ability of the operating partnership and its subsidiaries to incur indebtedness will not apply to the Company.

The Company has no significant operations, other than as the operating partnership’s general partner, and no material assets, other than its investment in the operating partnership. Accordingly, if the operating partnership fails to make a payment on the notes when due, there can be no assurance that the Company would have funds to pay that amount pursuant to its guarantee. See “Risk factors—Risks Related to this Offering and the Notes—The Company has no significant operations, other than as the operating partnership’s general partner, and no material assets, other than its investment in the operating partnership.”

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For additional information, see “Risk Factors—Risks Related to this Offering and the Notes—The effective subordination of the notes may limit our ability to satisfy our obligations under the notes.”

Redemption of the Notes at the Option of the Operating Partnership

The notes will be redeemable at the option of the operating partnership, at any time or from time to time prior to September 15, 2024 (the “Par Call Date”), either in whole or in part, at a redemption price equal to the greater of (i) 100% of the principal amount of the notes to be redeemed and (ii) the sum of the present values of the remaining scheduled payments of principal of and interest (exclusive of interest accrued to the applicable redemption date) on the notes to be redeemed assuming that such notes matured, and that interest on such notes was payable, on the Par Call Date discounted to such redemption date on a semiannual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 20 basis points, plus in each case accrued and unpaid interest on the principal amount of the notes being redeemed to such redemption date.

On and after the Par Call Date, the notes will be redeemable at the option of the operating partnership, at any time or from time to time, either in whole or in part, at a redemption price equal to 100% of the principal amount of the notes to be redeemed, plus accrued and unpaid interest on the principal amount of the notes being redeemed to the applicable redemption date.

Notwithstanding the foregoing, installments of interest that are due and payable on any interest payment date falling on or prior to a redemption date will be payable to the persons who were the registered holders of the notes (or one or more predecessor notes) at the close of business on the relevant record dates according to their terms and the provisions of the indenture. Written notice of redemption must be given to holders of the notes not less than 15 nor more than 60 days prior to the redemption date.

If the operating partnership redeems the notes in part, the trustee will select the notes to be redeemed (in principal amounts of $2,000 and integral multiples of $1,000 in excess thereof) by such method as it deems fair and appropriate or, if applicable, as is required by the depository for notes in global form.

In the event of any redemption of notes, the operating partnership will not be required to:

Unless the operating partnership defaults in the payment of the redemption price and accrued interest on the notes (or portions thereof) called for redemption on a redemption date, then, from and after the redemption date, such notes (or portions thereof, as the case may be) shall cease to bear interest.

Notwithstanding the foregoing, the operating partnership will not redeem the notes on any date if the principal amount of the notes has been accelerated, and the acceleration has not been rescinded or cured on or prior to the redemption date.

“Treasury Rate” means, with respect to any redemption date, the rate per annum equal to the semi-annual equivalent yield to maturity of the Comparable Treasury Issue, calculated by the operating partnership using a price for the Comparable Treasury Issue (expressed as a percentage of its principal amount) equal to the Comparable Treasury Price for such redemption date. The Treasury Rate shall be calculated on the third business day preceding the applicable redemption date. As used in the immediately preceding sentence and in the definition of “Reference Treasury Dealer Quotations” below, the term “business day” means any day (other than a Saturday or Sunday) that is not a day on which banking institutions in The City of New York are authorized or required by law, regulation or executive order to close.

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“Comparable Treasury Issue” means, with respect to any redemption date, the United States Treasury security selected by the Independent Investment Banker as having a maturity comparable to the remaining term (the “Remaining Life”) of the notes to be redeemed (assuming for this purpose that such notes matured on the Par Call Date) that would be utilized, at the time of selection and in accordance with customary financial practice, in pricing new issues of corporate debt securities of comparable maturity to the Remaining Life of such notes.

“Comparable Treasury Price” means, with respect to any redemption date, (i) if four or five Reference Treasury Dealer Quotations are obtained, the average (as calculated by the operating partnership) of the remaining Reference Treasury Dealer Quotations for such redemption date after excluding the highest and lowest such Reference Treasury Dealer Quotations from the four or five, as the case maybe, obtained, (ii) if fewer than four but more than one such Reference Treasury Dealer Quotations are obtained, the average (as calculated by the operating partnership) of all such quotations, or (iii) if only one such Reference Treasury Dealer Quotation is obtained, such Reference Treasury Dealer Quotation.

“Independent Investment Banker” means, with respect to any redemption date, J.P. Morgan Securities LLC and its successors, Barclays Capital Inc. and its successors, Merrill Lynch, Pierce, Fenner & Smith Incorporated and its successors, U.S. Bancorp Investments, Inc. and its successors or Wells Fargo Securities, LLC and its successors (whichever shall be appointed by the operating partnership in respect of such redemption date) or, if all such firms or the respective successors, if any, to such firms, as the case may be, are unwilling or unable to select the Comparable Treasury Issue, an independent investment banking institution of national standing appointed by the operating partnership.

“Reference Treasury Dealers” means, with respect to any redemption date, each of (i) J.P. Morgan Securities LLC, Barclays Capital Inc., Merrill Lynch, Pierce, Fenner & Smith Incorporated and Wells Fargo Securities, LLC (or their respective affiliates which are Primary Treasury Dealers (as defined below)) and their respective successors; provided, however, that if any such firm (or, if applicable, any such affiliate) or any such successor, as the case may be, shall cease to be a primary U.S. Government securities dealer in the United States (a “Primary Treasury Dealer”), the operating partnership will substitute therefor another Primary Treasury Dealer; and (ii) a Primary Treasury Dealer selected by U.S. Bancorp Investments, Inc., or its successor.

“Reference Treasury Dealer Quotations” means, with respect to each Reference Treasury Dealer and any redemption date, the average (as calculated by the operating partnership) of the bid and asked prices for the Comparable Treasury Issue (expressed in each case as a percentage of its principal amount) quoted in writing to the operating partnership by such Reference Treasury Dealer at 5:00 p.m., New York time, on the third business day preceding such redemption date.

Certain Covenants

The following covenants will be applicable to the notes:

Aggregate Debt Test. The operating partnership will not, and will not permit any of its Subsidiaries to, incur any Debt (including without limitation Acquired Debt) if, immediately after giving effect to the incurrence of such Debt and the application of the proceeds from such Debt on a pro forma basis, the aggregate principal amount of all outstanding Debt of the operating partnership and its Subsidiaries (determined on a consolidated basis in accordance with United States generally accepted accounting principles) is greater than 60% of the sum of the following (without duplication):

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For purposes of this covenant, Debt will be deemed to be incurred by the operating partnership or any of its Subsidiaries whenever the operating partnership or such Subsidiary shall create, assume, guarantee or otherwise become liable in respect thereof.

Debt Service Test. The operating partnership will not, and will not permit any of its Subsidiaries to, incur any Debt (including without limitation Acquired Debt) if the ratio of Consolidated Income Available for Debt Service to Annual Debt Service Charge for the period consisting of the four consecutive fiscal quarters most recently ended prior to the date on which such additional Debt is to be incurred shall have been less than 1.5:1 on a pro forma basis after giving effect to the incurrence of such Debt and the application of the proceeds from such Debt (determined on a consolidated basis in accordance with United States generally accepted accounting principles), and calculated on the following assumptions:

If the Debt giving rise to the need to make the calculation described in this covenant or any other Debt incurred after the first day of the relevant four-quarter period bears interest at a floating rate, then, for purposes of calculating the Annual Debt Service Charge, the interest rate on such Debt will be computed on a pro forma basis by applying the average daily rate which would have been in effect during the entire four-quarter period to the greater of the amount of such Debt outstanding at the end of such period or the average amount of such Debt outstanding during such period. For purposes of this covenant, Debt will be deemed to be incurred by the operating partnership or any of its Subsidiaries whenever the operating partnership or such Subsidiary shall create, assume, guarantee or otherwise become liable in respect thereof.

Secured Debt Test. The operating partnership will not, and will not permit any of its Subsidiaries to, incur any Debt (including without limitation Acquired Debt) secured by any Lien on any property or assets of the operating partnership or any of its Subsidiaries, whether owned on the date that the notes are originally issued or subsequently acquired, if, immediately after giving effect to the incurrence of such Debt and the application of the proceeds from such Debt on a pro forma basis, the aggregate principal amount (determined on a consolidated basis in accordance with United States generally accepted accounting principles) of all outstanding Debt of the operating partnership and its Subsidiaries which is secured by a Lien on any property or assets of the operating partnership or any of its Subsidiaries is greater than 40% of the sum of (without duplication):

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For purposes of this covenant, Debt will be deemed to be incurred by the operating partnership or any of its Subsidiaries whenever the operating partnership or such Subsidiary shall create, assume, guarantee or otherwise become liable in respect thereof.

Maintenance of Total Unencumbered Assets. The operating partnership will not have at any time Total Unencumbered Assets of less than 150% of the aggregate principal amount of all outstanding Unsecured Debt of the operating partnership and its Subsidiaries determined on a consolidated basis in accordance with United States generally accepted accounting principles.

Existence. Except as permitted by the covenant described in the accompanying prospectus under “Description of Debt Securities and Related Guarantees—Merger, Consolidation and Sale of Assets,” the operating partnership will do or cause to be done all things necessary to preserve and keep in full force and effect its existence, rights (charter and statutory) and franchises, and the Company will do or cause to be done all things necessary to preserve and keep in full force and effect its existence, rights (charter and statutory) and franchises. However, neither the operating partnership nor the Company will be required to preserve any right or franchise if the board of directors of the operating partnership’s general partner or the Company (or any duly authorized committee of that board of directors), as the case may be, determines that the preservation of the right or franchise is no longer desirable in the conduct of the business of the operating partnership or the Company, as the case may be.

Maintenance of Properties. The operating partnership will cause all of its properties used or useful in the conduct of its business or the business of any Subsidiary of the operating partnership to be maintained and kept in good condition, repair and working order and supplied with all necessary equipment and cause all necessary repairs, renewals, replacements, betterments and improvements to be made, all as in the judgment of the operating partnership may be necessary in order for the operating partnership to at all times properly and advantageously conduct its business carried on in connection with such properties.

Insurance. The operating partnership will, and will cause each of its Subsidiaries to, keep in force upon all of its properties and operations insurance policies carried with responsible companies in such amounts and covering all such risks as is customary in the industry in which the operating partnership and its Subsidiaries do business in accordance with prevailing market conditions and availability.

Payment of Taxes and Other Claims. Each of the operating partnership and the Company will pay or discharge or cause to be paid or discharged before it becomes delinquent:

However, neither the Company nor the operating partnership will be required to pay or discharge or cause to be paid or discharged any tax, assessment, charge or claim the amount, applicability or validity of which is being contested in good faith by appropriate proceedings.

Provision of Financial Information. The operating partnership and the Company will:

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The covenants described under this caption “—Certain Covenants” shall, insofar as they relate to the notes, be subject to covenant defeasance as described in the accompanying prospectus under “Description of Debt Securities and Related Guarantees—Discharge, Defeasance and Covenant Defeasance,” provided that, notwithstanding the foregoing, the covenant of the operating partnership and the Company to do or cause to be done all things necessary to preserve and keep in full force and effect their respective existence (except as permitted by the provisions described in the accompanying prospectus under “Description of Debt Securities and Related Guarantees—Merger, Consolidation and Sale of Assets”) and the provisions described above under “—Provision of Financial Information” shall not be subject to covenant defeasance. In addition, the operating partnership and the Company may omit in any particular instance to comply, insofar as relates to the notes, with any covenant described under this caption “—Certain Covenants” (other than the covenant described under “—Provision of Financial Information”) if the holders of at least a majority in principal amount of the outstanding notes waive such compliance.

Trustee

U.S. Bank National Association will initially act as the trustee, registrar and paying agent for the notes.

If the trustee becomes one of the operating partnership’s or the Company’s creditors, it will be subject to limitations on its rights to obtain payment of claims or to realize on some property received for any such claim, as security or otherwise. The trustee is permitted to engage in other transactions with the operating partnership, the Company or their respective subsidiaries. If, however, it acquires any conflicting interest, it must eliminate that conflict or resign.

Payments on the Notes; Paying Agent and Registrar; Transfer

The operating partnership will maintain an office or agency where notes may be presented or surrendered for payment and for registration of transfer and exchange. Interest on any note that is payable, and is punctually paid or duly provided for, on any interest payment date will be paid to the person in whose name that note (or one or more predecessor notes) is registered at the close of business on the applicable record date; provided, however, that except as provided in the next sentence, each installment of interest on any note may at the operating partnership’s option be paid by mailing a check for such interest to the address of the person entitled thereto as such address appears in the notes register or by wire transfer to an account maintained by the payee located inside the United States. Notwithstanding the foregoing, a (1) holder of certificated notes (if issued) in an

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aggregate principal amount of more than $5.0 million will have the right, upon application by such holder to the registrar for the notes not later than the relevant record date, to require that interest on those notes be paid by wire transfer in immediately available funds to that holder’s account within the United States, which application shall remain in effect until the holder notifies, in writing, the registrar to the contrary; and (2) the operating partnership will pay the principal of and premium, if any, and interest on notes in global form registered in the name of DTC or its nominee by wire transfer of immediately available funds to DTC or its nominee, as the case may be, as the registered holder of such global notes. The operating partnership has initially designated the trustee as paying agent and registrar for the notes and its agency in Los Angeles, California as a place where notes may be presented for payment or for registration of transfer or exchange. The operating partnership may, however, change the paying agent or registrar without prior notice to the holders of the notes, and the operating partnership may act as paying agent or registrar.

If any interest payment date, stated maturity date or redemption date of a note is not a business day, the payment otherwise required to be made on such date may be made on the next business day with the same force and effect as if made on such interest payment date, stated maturity date or redemption date, as the case may be, and no interest shall accrue on the amount so payable for the period from and after such interest payment date, stated maturity date or redemption date, as the case may be. All payments will be made in United States dollars.

A holder of notes may transfer or exchange notes at the office of the registrar in accordance with the indenture. Every note presented or surrendered for registration of transfer or for exchange or redemption shall (if so required by the operating partnership or the registrar) be duly endorsed, or accompanied by a written instrument of transfer in form satisfactory to the operating partnership and the registrar, duly executed by the registered holder thereof or such holder’s attorney duly authorized in writing. No service charge shall be made for any registration of transfer or exchange of notes, but the operating partnership may require payment of a sum sufficient to cover any tax or other governmental charge that may be imposed in connection therewith, subject to limited exceptions.

The registered holder of a note will be treated as the owner of the note for all purposes.

No Personal Liability of Directors, Officers, Employees and Stockholders

No recourse under or upon any obligation, covenant or agreement contained in the indenture or any note or because of any indebtedness evidenced thereby shall be had against any past, present or future stockholder, employee, officer or director, as such, of the operating partnership or the Company (either in its capacity as the operating partnership’s general partner or as guarantor of the notes), all such liability being expressly waived and released by the acceptance of the notes by the registered holders and as part of the consideration for the issue of the notes.

Notices

The indenture provides that notices to holders of the notes will be given by mail to the addresses of holders of the notes as they appear in the note register.

Governing Law

The indenture, the notes and the guarantees endorsed on the notes will be governed by, and construed in accordance with, the law of the State of New York.

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Definitions

As used in the indenture, the following terms have the respective meanings specified below (the terms “Government Obligations” and “Significant Subsidiary” are used in the accompanying prospectus and, as used therein, shall have the meanings set forth below):

“Acquired Debt” means Debt of a person:

Acquired Debt shall be deemed to be incurred on the date the acquired person is merged or consolidated with or into the operating partnership or any of its Subsidiaries or becomes a Subsidiary of the operating partnership or the date of the related acquisition, as the case may be.

“Annual Debt Service Charge” means, for any period, the interest expense of the operating partnership and its Subsidiaries for such period, determined on a consolidated basis in accordance with United States generally accepted accounting principles, including, without duplication:

“Consolidated Income Available for Debt Service” for any period means Consolidated Net Income of the operating partnership and its Subsidiaries for such period, plus amounts which have been deducted and minus amounts which have been added for, without duplication:

all determined on a consolidated basis in accordance with United States generally accepted accounting principles.

“Consolidated Net Income” for any period means the amount of net income (or loss) of the operating partnership and its Subsidiaries for such period, excluding, without duplication:

all determined on a consolidated basis in accordance with United States generally accepted accounting principles.

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“Debt” means, with respect to any person, any indebtedness of such person, whether or not contingent, in respect of:

and also includes, to the extent not otherwise included, any obligation of such person to be liable for, or to pay, as obligor, guarantor or otherwise (other than for purposes of collection in the ordinary course of business), Debt of the types referred to above of another person (it being understood that Debt shall be deemed to be incurred by such person whenever such person shall create, assume, guarantee or otherwise become liable in respect thereof).

“Government Obligations” means securities which are:

and which, in either of the above cases, are not callable or redeemable at the option of the issuer thereof and also includes a depository receipt issued by a bank or trust company as custodian with respect to any such Government Obligation or a specific payment of interest on or principal of any such Government Obligation held by such custodian for the account of the holder of a depository receipt, provided that (except as provided by law) such custodian is not authorized to make any deduction from the amount payable to the holder of such depository receipt from any amount received by the custodian in respect of the Government Obligation or the specific payment of interest on or principal of the Government Obligation evidenced by such depository receipt.

“Lien” means any mortgage, deed of trust, lien, charge, pledge, security interest, security agreement, or other encumbrance of any kind.

“Significant Subsidiary” means, with respect to the operating partnership or the Company, any Subsidiary which is a “significant subsidiary” (as defined in Article 1, Rule 1-02 of Regulation S-X promulgated under the Securities Act of 1933, as amended) of the operating partnership or the Company, as the case may be.

“Subsidiary” means, with respect to the operating partnership or the Company, any person (as defined in the indenture but excluding an individual), a majority of the outstanding voting stock, partnership interests, membership interests or other equity interest, as the case may be, of which is owned or controlled, directly or indirectly, by the operating partnership or the Company, as the case may be, or by one or more other Subsidiaries of the operating partnership or the Company, as the case may be. For the purposes of this definition, “voting stock” means stock having voting power for the election of directors, trustees or managers, as the case may be, whether at all times or only so long as no senior class of stock has such voting power by reason of any contingency.

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“Total Assets” means the sum of, without duplication:

all determined on a consolidated basis in accordance with United States generally accepted accounting principles.

“Total Unencumbered Assets” means the sum of, without duplication:

all determined on a consolidated basis in accordance with United States generally accepted accounting principles; provided, however, that, in determining Total Unencumbered Assets as a percentage of outstanding Unsecured Debt for purposes of the covenant set forth above in “Certain Covenants—Maintenance of Total Unencumbered Assets,” all investments in unconsolidated limited partnerships, unconsolidated limited liability companies and other unconsolidated entities shall be excluded from Total Unencumbered Assets.

“Undepreciated Real Estate Assets” means, as of any date, the cost (original cost plus capital improvements) of real estate assets of the operating partnership and its Subsidiaries on such date, before depreciation and amortization, all determined on a consolidated basis in accordance with United States generally accepted accounting principles.

“Unsecured Debt” means Debt of the operating partnership or any of its Subsidiaries which is not secured by a Lien on any property or assets of the operating partnership or any of its Subsidiaries.

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Supplement to Certain Provisions of Maryland Law and of the Company’s Charter and Bylaws

The discussion appearing under the caption “Certain Provisions of Maryland Law and of the Company’s Charter and Bylaws” in the accompanying prospectus has been supplemented and, in certain cases, superseded by the discussion appearing in our Current Report on Form 8-K filed with the SEC on February 1, 2017 (the “February 1 Form 8-K”) with respect to certain provisions of our bylaws and Maryland law. The February 1 Form 8-K is incorporated by reference in this prospectus supplement and the accompanying prospectus and may be obtained as described under “Where You Can Find More Information” in the accompanying prospectus. See “Incorporation of Certain Documents by Reference.” Prospective investors should carefully review the discussion appearing under the caption “Certain Provisions of Maryland Law and of the Company’s Charter and Bylaws” in the accompanying prospectus and in the February 1 Form 8-K, as well as the other information included and incorporated by reference in this prospectus supplement and the accompanying prospectus, before acquiring any of the notes pursuant to this prospectus supplement and the accompanying prospectus.

Supplemental United States Federal Income Tax Considerations

The discussion appearing under the caption “United States Federal Income Tax Considerations” in the accompanying prospectus has been supplemented and, in certain cases, superseded by the discussion appearing in Exhibit 99.1 to our and the operating partnership’s Current Report on Form 8-K filed with the SEC on October 30, 2017 (the “October 30 Form 8-K”) with respect to certain supplemental United States federal income tax considerations. The October 30 Form 8-K is incorporated by reference in this prospectus supplement and the accompanying prospectus and may be obtained as described under “Where You Can Find More Information” in the accompanying prospectus. See “Incorporation of Certain Documents By Reference.” Prospective investors should carefully review the discussion appearing under the caption “United States Federal Income Tax Considerations” in the accompanying prospectus and in Exhibit 99.1 to the October 30 Form 8-K, as well as the other information included and incorporated by reference in this prospectus supplement and the accompanying prospectus, before acquiring any notes pursuant to this prospectus supplement and the accompanying prospectus.

Prospective investors in the notes should consult their tax advisors regarding the United States federal income and other tax consequences to them of the acquisition, ownership and disposition of the notes offered by this prospectus supplement and the accompanying prospectus.

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Underwriting (Conflicts of Interest)

J.P. Morgan Securities LLC, U.S. Bancorp Investments, Inc., Barclays Capital Inc., Merrill Lynch, Pierce, Fenner & Smith Incorporated and Wells Fargo Securities, LLC are acting as joint book-running managers of this offering and J.P. Morgan Securities LLC and U.S. Bancorp Investments, Inc. are acting as representatives of the underwriters named below. Subject to the terms and conditions set forth in an underwriting agreement among the Company, the operating partnership and the representatives of the underwriters, the operating partnership has agreed to sell to the underwriters, and each of the underwriters has agreed, severally and not jointly, to purchase from the operating partnership, the principal amount of notes set forth opposite its name below.

Subject to the terms and conditions set forth in the underwriting agreement, the underwriters have agreed to purchase all of the notes sold under the underwriting agreement if any of these notes are purchased. If an underwriter defaults, the underwriting agreement provides that the purchase commitments of the non-defaulting underwriters may be increased or the underwriting agreement may be terminated.

The operating partnership and the Company have agreed to indemnify the underwriters against certain liabilities in connection with this offering, including liabilities under the Securities Act, or to contribute to payments the underwriters may be required to make in respect of those liabilities.

The underwriters are offering the notes, subject to prior sale, when, as and if issued to and accepted by them, subject to approval of legal matters by their counsel and other conditions contained in the underwriting agreement, such as the receipt by the underwriters of officers’ certificates. The underwriters reserve the right to withdraw, cancel or modify offers to the public and to reject orders in whole or in part.

Discounts

The representatives of the underwriters have advised us that the underwriters propose initially to offer the notes to the public at the public offering price listed on the cover page of this prospectus supplement and may offer notes to dealers at that price less a concession not in excess of 0.375% of the principal amount of the notes. The underwriters may allow, and the dealers may reallow, a discount not in excess of 0.250% of the principal amount of the notes to other dealers. After the initial public offering, the public offering price, concession and discount may be changed.

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The following table shows the underwriting discount to be paid to the underwriters by us.

The expenses of this offering, not including the underwriting discount, are estimated at $750,000 and are payable by us.

New Issue of Notes

The notes are a new issue of securities with no established trading market. We do not intend to apply for listing of the notes on any securities exchange or for inclusion of the notes on any automated quotation system. We have been advised by the underwriters that they presently intend to make a market in the notes after completion of the offering. However, they are under no obligation to do so and may discontinue any market-making activities at any time without any notice.

We cannot assure you that an active trading market for the notes will develop or as to the liquidity of any trading market that may develop. If an active trading market for the notes does not develop, the market price and liquidity of the notes may be adversely affected.

Price Stabilization and Short Positions

In connection with the offering of the notes, the underwriters may engage in transactions that stabilize, maintain or otherwise affect the market price of the notes. Specifically, the underwriters may overallot in connection with this offering, creating a short position. In addition, the underwriters may bid for, and purchase, the notes in the open market to cover short positions or to stabilize the price of the notes. Any of these activities may stabilize or maintain the market price of the notes above independent market levels, but no representation is made that the underwriters will engage in any of those transactions or of the magnitude of any effect that the transactions described above, if commenced, may have on the market price of the notes. The underwriters will not be required to engage in these activities, and if they engage in these activities, they may end any of these activities at any time without notice.

Delayed Settlement

We expect that the delivery of the notes will be made against payment therefor on or about the closing date specified on the cover page of this prospectus supplement, which will be the tenth business day following the date of pricing of the notes (such settlement cycle being referred to herein as “T+10”). Under rules of the SEC, trades in the secondary market generally are required to settle in two business days, unless the parties to that trade expressly agree otherwise. Accordingly, purchasers who wish to trade the notes on the date of pricing or the next seven business days will be required, by virtue of the fact that the notes initially will settle in T+10, to specify an alternate settlement cycle at the time of any such trade to prevent a failed settlement. Purchasers of notes who wish to trade the notes on the date of pricing or the next seven business days should consult their own advisors.

Conflicts of Interest

We intend to use net proceeds from this offering to redeem the operating partnership’s 2018 Notes and to use the remaining net proceeds for general corporate purposes, which may include acquiring land and properties, funding development projects and repaying other outstanding indebtedness. Pending application for the foregoing purposes, we may use the net proceeds from this offering to repay borrowings under the operating partnership’s revolving credit facility and/or temporarily invest such net proceeds in marketable securities.

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To the extent that any of the underwriters or their affiliates own any of the operating partnership’s 2018 Notes, they may receive proceeds from this offering through the redemption of those 2018 Notes. In addition, affiliates of some or all of the underwriters are lenders under the operating partnership’s revolving credit facility and term loan facility. As described above under “Use of Proceeds,” net proceeds of this offering may be used to repay borrowings under the revolving credit facility and other indebtedness. Because affiliates of some or all of the underwriters are lenders under the revolving credit facility, to the extent that net proceeds from this offering are applied to repay borrowings under the revolving credit facility, such affiliates will receive proceeds of this offering through the repayment of those borrowings. Likewise, to the extent that the underwriters or any of their affiliates hold other indebtedness that is repaid with net proceeds from this offering, they will receive proceeds from this offering through the repayment of that indebtedness. If 5% or more of the net proceeds of this offering (not including the underwriting discount) is used to repay indebtedness owed to at least one of the underwriters and/or affiliates of such underwriter, this offering will be conducted in accordance with FINRA Rule 5121. In such event, such underwriter or underwriters may not confirm sales of the notes to accounts over which they exercise discretionary authority without the prior written approval of the customer.

Other Relationships

In addition to the matters discussed above under “—Conflicts of Interest,” some or all of the underwriters and/or their respective affiliates have engaged in, and/or may in the future engage in, investment banking, commercial banking, financial advisory and other commercial dealings in the ordinary course of business with the Company and the operating partnership and have received and in the future may receive fees and commissions for these transactions and services. In particular, U.S. Bancorp Investments, Inc., one of the underwriters, is an affiliate of the trustee under the indenture governing the notes.

In addition, in the ordinary course of their various business activities, the underwriters and their respective affiliates may make or hold a broad array of investments and actively trade debt and equity securities (or related derivative securities) and financial instruments (including bank loans) for their own account and for the accounts of their customers and such investment and securities activities may involve securities and/or instruments of the Company or the operating partnership. Certain of the underwriters or their affiliates that may have lending relationships with the Company or the operating partnership may also choose to hedge their credit exposure to the Company or the operating partnership, as the case may be, consistent with their customary risk management policies. Typically those underwriters and their affiliates would hedge such exposure by entering into transactions, which may consist of either the purchase of credit default swaps or the creation of short positions in securities of the Company or the operating partnership, including potentially the notes offered hereby. Any such credit default swaps or short positions could adversely affect future trading prices of the notes offered hereby. The underwriters and their respective affiliates may also make investment recommendations and/or publish or express independent research views in respect of securities or financial instruments of the Company or the operating partnership and may at any time hold, or recommend to clients that they acquire, long and/or short positions in such securities and instruments.

Selling Restrictions

No action has been taken in any jurisdiction (except in the United States) that would permit a public offering of the notes, or the possession, circulation or distribution of this prospectus supplement, the accompanying prospectus or any other material relating to us or the notes where action for that purpose is required. Accordingly, the notes may not be offered or sold, directly or indirectly, and neither this prospectus supplement, the accompanying prospectus nor any other offering material or advertisements in connection with the notes may be distributed or published, in or from any country or jurisdiction except in compliance with any applicable rules and regulations of any such country or jurisdiction.

Each of the underwriters may arrange to sell the notes offered hereby in certain jurisdictions outside the United States, either directly or through affiliates, where they are permitted to do so.

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Notice to Prospective Investors in the European Economic Area

Neither this prospectus supplement nor the accompanying prospectus is a prospectus for the purposes of the prospectus directive (as defined below). This prospectus supplement and the accompanying prospectus have been prepared on the basis that all offers of the notes in any Member State of the European Economic Area which has implemented the prospectus directive (a “relevant member state”) will be made pursuant to an exemption under the prospectus directive from the requirement to produce a prospectus in connection with offers of the notes. Accordingly, any person making or intending to make any offer in that relevant member state of the notes which are the subject of the offering contemplated in this prospectus supplement should only do so in circumstances in which no obligation arises for the operating partnership, the Company or any underwriter to produce a prospectus pursuant to Article 3 of the prospective directive for such offers.

In relation to each relevant member state, the notes which are the subject of the offering contemplated by this prospectus supplement may not be offered to the public in that relevant member state other than:

provided that no such offer of notes shall require the operating partnership, the Company or any underwriter to publish a prospectus pursuant to Article 3 of the prospectus directive or supplement a prospectus pursuant to Article 16 of the prospectus directive.

For the purposes of this provision, the expression “an offer of notes to the public” in relation to any notes in any relevant member state means the communication in any form and by any means of sufficient information on the terms of the offer and the notes to be offered so as to enable an investor to decide to purchase or subscribe for the notes, as the same may be varied in that member state by any measure implementing the prospectus directive in that member state and the expression “prospectus directive” means Directive 2003/71/EC (as amended, including by Directive 2010/73/EU), and includes any relevant implementing measure in the relevant member state.

Notice to Prospective Investors in the United Kingdom

The communication of this prospectus supplement, the accompanying prospectus and any other document or materials relating to the issue of the notes offered hereby is not being made, and such documents and/or materials have not been approved, by an authorized person for the purposes of section 21 of the United Kingdom’s Financial Services and Markets Act 2000, as amended (the “FSMA”). Accordingly, such documents and/or materials are not being distributed to, and must not be passed on to, the general public in the United Kingdom. The communication of such documents and/or materials as a financial promotion is only being made to those persons in the United Kingdom who have professional experience in matters relating to investments and who fall within the definition of investment professionals (as defined in Article 19(5) of the Financial Services and Markets Act 2000 (Financial Promotion) Order 2005, as amended (the “Financial Promotion Order”)), or within Article 49(2)(a) to (d) of the Financial Promotion Order, or to any other persons to whom it may otherwise lawfully be made under the Financial Promotion Order (all such persons together being referred to as “relevant persons”). In the United Kingdom, the notes offered hereby are only available to, and any investment or investment activity to which this prospectus supplement relates will be engaged in only with, relevant persons. Any person in the United Kingdom that is not a relevant person should not act or rely on this prospectus supplement, the accompanying prospectus or any of their contents.

The notes may only be offered (a) in compliance with all applicable provisions of the FSMA with respect to anything done in relation to the notes in, from or otherwise involving the United Kingdom and (b) where each

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underwriter has only communicated or caused to be communicated and will only communicate or cause to be communicated any invitation or inducement to engage in investment activity (within the meaning of Section 21 of the FSMA) received by it in connection with the issue or sale of notes in circumstances in which Section 21(1) of the FSMA does not apply to the operating partnership or the Company.

Notice to Prospective Investors in Australia

No placement document, prospectus, product disclosure statement or other disclosure document (including as defined in the Corporations Act 2001 (Cth) (“Corporations Act”)) has been or will be lodged with the Australian Securities and Investments Commission (“ASIC”) or any other governmental agency, in relation to the offering. This prospectus supplement and the accompanying prospectus do not constitute a prospectus, product disclosure statement or other disclosure document for the purposes of Corporations Act, and do not purport to include the information required for a prospectus, product disclosure statement or other disclosure document under the Corporations Act. No action has been taken which would permit an offering of the notes in circumstances that would require disclosure under Parts 6D.2 or 7.9 of the Corporations Act.

The notes may not be offered for sale, nor may application for the sale or purchase or any notes be invited in Australia (including an offer or invitation which is received by a person in Australia) and neither this prospectus supplement, the accompanying prospectus nor any other offering material or advertisement relating to the notes may be distributed or published in Australia unless, in each case:

Notice to Prospective Investors in Hong Kong

The contents of this prospectus supplement and the accompanying prospectus have not been reviewed or approved by any regulatory authority in Hong Kong. This prospectus supplement and the accompanying prospectus do not constitute an offer or invitation to the public in Hong Kong to acquire the notes. Accordingly, no person may issue or have in its possession for the purpose of issue, this prospectus supplement and/or the accompanying prospectus or any advertisement, invitation or document relating to the notes, which is directed at, or the contents of which are likely to be accessed or read by, the public in Hong Kong, except (i) where the notes are only intended to be offered to “professional investors” (as such term is defined in the Securities and Futures Ordinance (Cap. 571 of the Laws of Hong Kong) (“SFO”) and the subsidiary legislation made thereunder), (ii) in circumstances which do not result in this prospectus supplement and/or the accompanying prospectus being a “prospectus” as defined in the Companies (Winding Up and Miscellaneous Provisions) Ordinance of Hong Kong (Cap. 32 of the Laws of Hong Kong) (“CO”), or (iii) in circumstances which do not constitute an offer or an invitation to the public for the purposes of the SFO or the CO. The offer of the notes is personal to the person to

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whom this prospectus supplement and/or the accompanying prospectus have been delivered, and a subscription for the notes will only be accepted from such person. No person to whom a copy of this prospectus supplement and/or the accompanying prospectus is issued may copy, issue or distribute this prospectus supplement and/or the accompanying prospectus to any other person. You are advised to exercise caution in relation to the offer. If you are in any doubt about the contents of this prospectus supplement and/or the accompanying prospectus, you should obtain independent professional advice.

Notice to Prospective Investors in Japan

The notes have not been and will not be registered for a public offering in Japan pursuant to Article 4, Paragraph 1 of the Financial Instruments and Exchange Act of Japan (Act No. 25 of 1948, as amended; the “FIEA”). The notes may not be offered or sold, directly or indirectly, in Japan or to or for the account or benefit of any resident of Japan (which term as used herein means any person resident in Japan, including any corporation or other entity organized under the laws of Japan or having its principal office in Japan) or to, or for the account or benefit of, others for reoffering or resale, directly or indirectly, in Japan or to or for the account or benefit of any resident of Japan, except pursuant to an exemption from the registration requirements of the FIEA and otherwise in compliance with the FIEA and any other applicable laws, regulations and ministerial guidelines of Japan in effect at the relevant time.

Notice to Prospective Investors in Singapore

This prospectus supplement and the accompanying prospectus have not been registered as a prospectus under the Securities and Futures Act, Chapter 289 of Singapore (the “SFA”) by the Monetary Authority of Singapore, and the offer of the notes in Singapore is made primarily pursuant to the exemptions under Sections 274 and 275 of the SFA. Accordingly, this prospectus supplement and the accompanying prospectus or any other document or material in connection with the offer or sale, or invitation for subscription or purchase of the notes may not be circulated or distributed, nor may the notes be offered or sold, or be made the subject of an invitation for subscription or purchase, whether directly or indirectly, to any person in Singapore other than (i) to an institutional investor (as defined under Section 4A of the SFA) (an “Institutional Investor”) pursuant to Section 274 of the SFA, (ii) to an accredited investor (as defined in Section 4A of the SFA) (an “Accredited Investor”) or other relevant person (as defined in Section 275(2) of the SFA) (a “Relevant Person”) and pursuant to Section 275(1) of the SFA, or to any person pursuant to an offer referred to in Section 275(1A) of the SFA, and in accordance with the conditions specified in Section 275 of the SFA, or (iii) otherwise pursuant to, and in accordance with, the conditions of any other applicable exemption or provision of the SFA.

It is a condition of the offer that where the notes are subscribed for or acquired pursuant to an offer made in reliance on Section 275 of the SFA by a Relevant Person which is:

the shares, debentures and units of shares and debentures of that corporation and the beneficiaries’ rights and interest in that trust (howsoever described) shall not be transferred within 6 months after that corporation or that trust has subscribed for or acquired the notes except:

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Notice to Prospective Investors in Switzerland

The notes may not be publicly offered in Switzerland and will not be listed on the SIX Swiss Exchange (“SIX”) or on any other stock exchange or regulated trading facility in Switzerland. This prospectus supplement and the accompanying prospectus do not constitute a prospectus within the meaning of and have been prepared without regard to the disclosure standards for issuance prospectuses under art. 652a or art. 1156 of the Swiss Code of Obligations or the disclosure standards for listing prospectuses under art. 27 ff. of the SIX Listing Rules or the listing rules of any other stock exchange or regulated trading facility in Switzerland. Neither this prospectus supplement, the accompanying prospectus or any other offering or marketing material relating to the notes or the offering may be publicly distributed or otherwise made publicly available in Switzerland.

Neither this prospectus supplement, the accompanying prospectus nor any other offering or marketing material relating to the offering, Realty Income or the notes has been or will be filed with or approved by any Swiss regulatory authority. In particular, this prospectus supplement and the accompanying prospectus will not be filed with, and the offer of notes will not be supervised by, the Swiss Financial Market Supervisory Authority, and the offer of notes has not been and will not be authorized under the Swiss Federal Act on Collective Investment Schemes (the “CISA”). The investor protection afforded to acquirers of interests in collective investment schemes under the CISA does not extend to acquirers of the notes.

Notice to Prospective Investors in the United Arab Emirates

The notes have not been, and are not being, publicly offered, sold, promoted or advertised in the United Arab Emirates (including the Dubai International Financial Centre) other than in compliance with the laws of the United Arab Emirates (and the Dubai International Financial Centre) governing the issue, offering and sale of securities. Further, this prospectus supplement and the accompanying prospectus do not constitute a public offer of securities in the United Arab Emirates (including the Dubai International Financial Centre) and are not intended to be a public offer. This prospectus supplement and the accompanying prospectus have not been approved by or filed with the Central Bank of the United Arab Emirates, the Securities and Commodities Authority or the Dubai Financial Services Authority.

Notice to Prospective Investors in the Dubai International Financial Centre

This prospectus supplement and the accompanying prospectus relate to an Exempt Offer in accordance with the Markets Rules 2012 of the Dubai Financial Services Authority (“DFSA”). This prospectus supplement and the accompanying prospectus are intended for distribution only to persons of a type specified in the Markets Rules 2012 of the DFSA. They must not be delivered to, or relied on by, any other person. The DFSA has no responsibility for reviewing or verifying any documents in connection with Exempt Offers. The DFSA has not approved this prospectus supplement or the accompanying prospectus nor taken steps to verify the information set forth herein or therein and has no responsibility for this document. The securities to which this prospectus supplement and the accompanying prospectus relate may be illiquid and/or subject to restrictions on their resale. Prospective purchasers of the notes offered hereby should conduct their own due diligence on the notes. If you do not understand the contents of this prospectus supplement and the accompanying prospectus, you should consult an authorized financial advisor.

In relation to its use in the Dubai International Financial Centre, this prospectus supplement and the accompanying prospectus are strictly private and confidential and are being distributed to a limited number of investors and must not be provided to any person other than the original recipient, and may not be reproduced or used for any other purpose. The interests in the notes may not be offered or sold directly or indirectly to the public in the Dubai International Financial Centre.

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Incorporation of Certain Documents by Reference

The SEC allows us to “incorporate by reference” the information we file with the SEC, which means that we can disclose important information to you by referring to those documents. The information incorporated by reference is an important part of this prospectus supplement and the accompanying prospectus. Any statement contained in this prospectus supplement, the accompanying prospectus or a document which is incorporated by reference in this prospectus supplement or the accompanying prospectus is automatically updated and superseded if information contained in this prospectus supplement or the accompanying prospectus, or information that we later file with the SEC prior to the termination of this offering that is incorporated by reference or deemed to be incorporated by reference herein or therein, as the case may be, modifies or replaces such statements. We incorporate by reference the following documents we filed with the SEC:

We are also incorporating by reference any additional documents that we file with the SEC pursuant to Sections 13 (a), 13(c), 14 or 15(d) of the Exchange Act on or after the date of this prospectus supplement and before the termination of this offering. We are not, however, incorporating by reference any documents or portions thereof or exhibits thereto, whether specifically listed above or filed in the future, that are deemed to have been “furnished” to, rather than “filed” with, the SEC, including our compensation committee report and performance graph included or incorporated by reference in any Annual Report on Form 10-K or proxy statement, or any information or related exhibits furnished pursuant to Items 2.02 or 7.01 of Form 8-K, or any exhibits filed pursuant to Item 9.01 of Form 8-K that are not deemed “filed” with the SEC.

To receive a free copy of any of the documents incorporated by reference in this prospectus supplement and the accompanying prospectus, including exhibits, if they are specifically incorporated by reference in the documents, call or write Kilroy Realty Corporation, 12200 West Olympic Boulevard, Suite 200, Los Angeles, California 90064, Attention: Secretary (telephone (310) 481-8400).

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Legal Matters

Certain legal matters in connection with this offering will be passed upon for us by Latham & Watkins LLP, Los Angeles, California. Certain legal matters relating to Maryland law will be passed upon for us by Ballard Spahr LLP, Baltimore, Maryland. Sidley Austin LLP, San Francisco, California, will act as counsel for the underwriters.

Experts

The consolidated financial statements, and the related financial statement schedules, incorporated in this prospectus supplement by reference from Kilroy Realty Corporation’s Annual Report on Form 10-K for the year ended December 31, 2016, and the effectiveness of Kilroy Realty Corporation’s internal control over financial reporting have been audited by Deloitte & Touche LLP, an independent registered public accounting firm, as stated in their reports, which are incorporated herein by reference. Such consolidated financial statements and financial statement schedules have been so incorporated in reliance upon the reports of such firm given upon their authority as experts in accounting and auditing.

The consolidated financial statements, and the related financial statement schedules, incorporated in this prospectus supplement by reference from Kilroy Realty, L.P.’s Annual Report on Form 10-K for the year ended December 31, 2016, and the effectiveness of Kilroy Realty, L.P.’s internal control over financial reporting have been audited by Deloitte & Touche LLP, an independent registered public accounting firm, as stated in their reports, which are incorporated herein by reference. Such consolidated financial statements and financial statement schedules have been so incorporated in reliance upon the reports of such firm given upon their authority as experts in accounting and auditing.

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PROSPECTUS

KILROY REALTY CORPORATION

Common Stock, Preferred Stock, Depositary Shares, Warrants and Guarantees

KILROY REALTY, L.P.

Debt Securities

We may offer from time to time in one or more series or classes (i) debt securities of Kilroy Realty, L.P. which may be fully and unconditionally guaranteed by Kilroy Realty Corporation, (ii) shares of Kilroy Realty Corporation’s common stock, par value $.01 per share, (iii) shares or fractional shares of Kilroy Realty Corporation’s preferred stock, par value $.01 per share, (iv) shares of Kilroy Realty Corporation’s preferred stock represented by depositary shares and (v) warrants to purchase preferred stock or common stock, referred to collectively in this prospectus as the offered securities, separately or together, in separate series in amounts, at prices and on terms to be set forth in one or more supplements to this prospectus.

The specific terms of the offered securities with respect to which this prospectus is being delivered will be set forth in the applicable prospectus supplement, along with any applicable modifications of or additions to the general terms of the debt securities as described in this prospectus, and will include, where applicable (i) in the case of debt securities and, as applicable, related guarantees, the specific terms of such debt securities, which may be either senior or subordinated, secured or unsecured, and related guarantees, (ii) in the case of common stock, any initial public offering price; (iii) in the case of preferred stock, the specific title and any dividend, liquidation, redemption, conversion, voting and other rights and any initial public offering price; (iv) in the case of depositary shares, the fractional or multiple shares of preferred stock represented by each such depositary share; and (v) in the case of warrants, the duration, offering price, exercise price and detachability. In addition, such specific terms may include limitations on actual or constructive ownership and restrictions on transfer of the offered securities, in each case as may be appropriate to preserve Kilroy Realty Corporation’s status as a real estate investment trust, or REIT, for federal income tax purposes.

The applicable prospectus supplement will also contain information, where applicable, about (i) certain United States federal income tax consequences relating to, and (ii) any listing on a securities exchange of, the offered securities covered by such prospectus supplement.

The securities may be offered directly, through agents we may designate from time to time or by, to or through underwriters or dealers. The securities also may be offered by securityholders, if so provided in a prospectus supplement hereto. We will provide specific information about any selling securityholders in one or more supplements to this prospectus. If any agents or underwriters are involved in the sale of any of the offered securities, their names, and any applicable purchase price, fee, commission or discount arrangement with or among them, will be set forth in, or will be calculable from the information set forth in, the applicable prospectus supplement. See “Plan of Distribution.” No offered securities may be sold without delivery of this prospectus and the applicable prospectus supplement describing the method and terms of the offering of such series of offered securities.

Kilroy Realty Corporation’s common stock is listed on the New York Stock Exchange, or NYSE, under the symbol “KRC.” On September 28, 2016, the last reported sales price of Kilroy Realty Corporation’s common stock on the NYSE was $69.55 per share.

Before you invest in the offered securities, you should consider the risks discussed in “Risk Factors” on page 1.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or passed upon the accuracy or completeness of this prospectus. Any representation to the contrary is a criminal offense.

The date of this prospectus is September 29, 2016.

TABLE OF CONTENTS

Kilroy Realty, L.P., or the operating partnership, is a Delaware limited partnership. Kilroy Realty Corporation, or the Company or guarantor, is the sole general partner of the operating partnership. Unless otherwise expressly stated or the context otherwise requires, in this prospectus, “we,” “us” and “our” refer collectively to the Company, the operating partnership and the Company’s other subsidiaries, references to “Company common stock” or similar references refer to the common stock, par value $.01 per share, of the Company and references to “common units” or similar references refer to the common units of the operating partnership.

You should rely only on the information contained in this prospectus, the applicable prospectus supplement, the documents incorporated or deemed to be incorporated by reference in either and any free writing prospectus that we may provide you in connection with the offered securities. We have not authorized anyone to provide you with information or make any representation that is different. If anyone provides you with any additional or different information, you should not rely on it. Neither this prospectus nor the applicable prospectus supplement nor any such free writing prospectus is an offer to sell or a solicitation of an offer to buy any securities other than the registered securities to which they relate or an offer to sell or the solicitation of an offer to buy securities in any jurisdiction where, or to any person to whom, it is unlawful to make an offer or solicitation. You should not assume that the information contained in this prospectus, the applicable prospectus supplement, any document incorporated or deemed to be incorporated by reference in either or any free writing prospectus that we may provide you in connection with the offered securities is accurate on any date after the respective dates of those documents. Our business, financial condition, results of operations, funds from operations and prospects may have changed since those respective dates.

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RISK FACTORS

Investment in the offered securities involves risks. Before acquiring any offered securities pursuant to this prospectus, you should carefully consider the information contained or incorporated by reference in this prospectus, in the applicable prospectus supplement or in any free writing prospectus that we may prepare in connection with the offered securities, including, without limitation, the risks set forth under the captions “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” (or similar captions) in Kilroy Realty Corporation’s and Kilroy Realty, L.P.’s most recent Annual Report on Form 10-K and subsequent Quarterly Reports on Form 10-Q, incorporated into this prospectus and the applicable prospectus supplement by reference, as updated in subsequent filings of Kilroy Realty Corporation and Kilroy Realty, L.P. with the Securities and Exchange Commission, or the SEC, under the Securities Exchange Act of 1934, as amended, or the Exchange Act, that are incorporated by reference in either. The occurrence of any of these risks could materially and adversely affect our business, financial condition, liquidity, results of operations, funds from operations and prospects and might cause you to lose all or a part of your investment in the offered securities. Please also refer to the section entitled “Forward-Looking Statements” included elsewhere in this prospectus and the applicable prospectus supplement.

FORWARD-LOOKING STATEMENTS

This prospectus and the applicable prospectus supplement, including the documents incorporated by reference in either, contain, and documents we subsequently file with the SEC and incorporate by reference in either may contain, certain “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, or Securities Act, and Section 21E of the Exchange Act, including information concerning our capital resources, portfolio performance, results of operations, projected future occupancy and rental rates, lease expirations, debt maturities, potential investments, strategies such as capital recycling, development and redevelopment activity, projected construction costs, projected construction commencement and completion dates, dispositions, future executive incentive compensation, pending, potential or proposed acquisitions, the anticipated use of proceeds from any offered securities, anticipated growth in our funds from operations and anticipated market conditions, demographics, and similar matters. Forward-looking statements can be identified by the use of words such as “believes,” “expects,” “projects,” “may,” “will,” “should,” “seeks,” “approximately,” “intends,” “plans,” “pro forma,” “estimates” or “anticipates” and the negative of these words and phrases and similar expressions that do not relate to historical matters. Forward-looking statements are based on our current expectations, beliefs and assumptions, and are not guarantees of future performance. Forward- looking statements are inherently subject to uncertainties, risks, changes in circumstances, trends and factors that are difficult to predict, many of which are outside of our control. Accordingly, actual performance, results and events may vary materially from those indicated in the forward-looking statements, and you should not rely on the forward-looking statements as predictions of future performance, results or events. Numerous factors could cause actual future performance, results and events to differ materially from those indicated in the forward-looking statements, including, among others:

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The factors included in this prospectus and the applicable prospectus supplement, including the documents incorporated by reference in either, and documents we subsequently file with the SEC and incorporate by reference in either, are not exhaustive and additional factors could adversely affect our business and financial performance. For a discussion of additional risk factors, see the factors included under the caption “Risk Factors” in this prospectus, in the applicable prospectus supplement, in our and the operating partnership’s most recent Annual Report on Form 10-K, and in our and the operating partnership’s subsequent Quarterly Reports on Form 10-Q, as well as the other risks described in this prospectus and the applicable prospectus supplement and the documents incorporated by reference in either. All forward-looking statements are based on information that was available, and speak only, as of the date on which they were made. We assume no obligation to update any forward-looking statement that becomes untrue because of subsequent events, new information or otherwise, except to the extent we are required to do so in connection with our ongoing requirements under Federal securities laws.

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CONSOLIDATED RATIO OF EARNINGS TO COMBINED FIXED CHARGES AND PREFERRED DIVIDENDS

Kilroy Realty Corporation’s consolidated ratio of earnings to fixed charges and consolidated ratio of earnings to combined fixed charges and preferred dividends for each of the periods indicated was as follows:

We have computed the consolidated ratio of earnings to fixed charges for Kilroy Realty Corporation by dividing earnings by fixed charges. Earnings consist of income from continuing operations before the effect of noncontrolling interest plus fixed charges and amortization of capitalized interest, reduced by capitalized interest and loan costs and distributions on Series A cumulative redeemable preferred units prior to their redemption on August 15, 2012. Fixed charges consist of interest costs, whether expensed or capitalized, amortization of loan costs, an estimate of the interest within rental expense, and distributions on Series A cumulative redeemable preferred units prior to their redemption on August 15, 2012.

We have computed the consolidated ratio of earnings to combined fixed charges and preferred dividends for Kilroy Realty Corporation by dividing earnings by combined fixed charges and preferred dividends. Earnings consist of income from continuing operations before the effect of noncontrolling interest plus fixed charges and amortization of capitalized interest, reduced by capitalized interest and loan costs and distributions on Series A cumulative redeemable preferred units prior to their redemption on August 15, 2012. Fixed charges consist of interest costs, whether expensed or capitalized, amortization of loan costs, an estimate of the interest within rental expense, and distributions on Series A cumulative redeemable preferred units prior to their redemption on August 15, 2012. Preferred dividends consist of dividends on the Company’s 6.375% Series H Cumulative Redeemable Preferred Stock (the “Series H preferred stock”) and 6.875% Series G Cumulative Redeemable Preferred Stock (the “Series G preferred stock”) since their issuance on August 6, 2012 and March 16, 2012, respectively, and on the Company’s 7.50% Series F Cumulative Redeemable Preferred Stock and 7.80% Series E Cumulative Redeemable Preferred Stock prior to their redemption on April 16, 2012.

The computation of the consolidated ratio of earnings to fixed charges indicates that earnings were inadequate to cover fixed charges, calculated as described above, by approximately $14.6 million, $23.5 million and $26.8 million for the years ended December 31, 2013, 2012 and 2011, respectively.

The computation of the consolidated ratio of earnings to combined fixed charges and preferred dividends indicates that earnings were inadequate to cover fixed charges and preferred dividends, calculated as described above, by approximately $27.9 million, $34.1 million and $36.4 million for the years ended December 31, 2013, 2012 and 2011, respectively.

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Kilroy Realty, L.P.’s consolidated ratio of earnings to fixed charges for each of the periods indicated was as follows:

We have computed the consolidated ratio of earnings to fixed charges for Kilroy Realty, L.P. by dividing earnings by fixed charges. Earnings consist of income from continuing operations before the effect of noncontrolling interest plus fixed charges and amortization of capitalized interest, reduced by capitalized interest and loan costs. Fixed charges consist of interest costs, whether expensed or capitalized, amortization of loan costs and an estimate of the interest within rental expense.

The computation of the consolidated ratio of earnings to fixed charges indicates that earnings were inadequate to cover fixed charges, calculated as described above, by approximately $14.6 million, $19.9 million and $21.2 million for the years ended December 31, 2013, 2012 and 2011, respectively.

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THE COMPANY

We are a self-administered REIT active in premier office submarkets along the West Coast. We own, develop, acquire and manage real estate assets, consisting primarily of Class A properties in the coastal regions of Los Angeles, Orange County, San Diego County, the San Francisco Bay Area and greater Seattle, which we believe have strategic advantages and strong barriers to entry. Class A real estate encompasses attractive and efficient buildings of high quality that are attractive to tenants, are well-designed and constructed with above-average material, workmanship and finishes and are well-maintained and managed.

As of June 30, 2016, our stabilized office portfolio was comprised of 102 office properties, which encompassed an aggregate of approximately 13.7 million rentable square feet. As of June 30, 2016, these properties were approximately 95.5% occupied by 526 tenants. Our stabilized portfolio includes all of our properties with the exception of development and redevelopment properties currently under construction or committed for construction, “lease-up” properties, real estate assets held for sale, undeveloped land and our recently completed residential property. As of June 30, 2016, we had one development project under construction that is expected to encompass approximately 700,000 aggregate rentable square feet upon completion. We define “redevelopment properties” as those properties for which we expect to spend significant development and construction costs on the existing or acquired buildings pursuant to a formal plan, the intended result of which is a higher economic return on the property. As of June 30, 2016, we had no redevelopment properties. We define “lease-up” properties as office properties we recently developed or redeveloped that have not yet reached 95% occupancy and are within one year following cessation of major construction activities. As of June 30, 2016, we had two development projects in “lease-up,” encompassing approximately 443,000 aggregate rentable square feet, two properties held for sale and eight development sites, representing approximately 70 gross acres of undeveloped land.

Kilroy Realty Corporation is a Maryland corporation organized to qualify as a REIT under the Internal Revenue Code of 1986, as amended, or the Code, which owns its interests in all of its properties through the operating partnership and Kilroy Realty Finance Partnership, L.P., both of which are Delaware limited partnerships. We generally conduct substantially all of our operations through the operating partnership in which, as of June 30, 2016, Kilroy Realty Corporation owned an approximate 97.2% general partnership interest. The remaining approximately 2.8% common limited partnership interest in the operating partnership as of June 30, 2016 was owned by non-affiliated investors and certain executive officers and directors of Kilroy Realty Corporation.

The Company’s outstanding common stock and preferred stock are listed on the NYSE. The Company’s common stock is listed under the symbol “KRC,” the Company’s 6.875% Series G Cumulative Redeemable Preferred Stock is listed under the symbol “KRC-PG,” and the Company’s 6.375% Series H Cumulative Redeemable Preferred Stock is listed under the symbol “KRC-PH.”

Our principal executive offices are located at 12200 West Olympic Boulevard, Suite 200, Los Angeles, California 90064. Our telephone number is (310) 481-8400.

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USE OF PROCEEDS

We intend to use the net proceeds from the sale of the offered securities as set forth in the applicable prospectus supplement. We will not receive any of the proceeds from sales of offered securities by selling securityholders.

DESCRIPTION OF DEBT SECURITIES AND RELATED GUARANTEES

This section describes the general terms and provisions of the operating partnership’s debt securities. When our operating partnership offers to sell a particular series of debt securities, we will describe the specific terms of the series in a supplement to this prospectus, along with any applicable modifications of or additions to the general terms of the debt securities as described in this prospectus, including the terms of any related guarantees by the Company and the terms, if any, on which a series of debt securities may be convertible into or exchangeable for other securities. To the extent the information contained in the prospectus supplement differs from this summary description, you should rely on the information in the prospectus supplement.

The debt securities may be offered either separately, or together with, or upon the conversion or exercise of or in exchange for, other securities described in this prospectus. Debt securities may be the operating partnership’s senior, senior subordinated or subordinated obligations and may be issued in one or more series. Unless otherwise specified in the applicable prospectus supplement, the debt securities will be the operating partnership’s direct, unsecured senior obligations and will rank equally in right of payment with all of its other senior unsecured indebtedness.

Unless otherwise specified in a prospectus supplement, the debt securities will be issued under the indenture dated as of March 1, 2011, as amended and supplemented by a supplemental indenture thereto dated as of July 5, 2011 (as so amended and supplemented, the “indenture”), among the operating partnership, the Company and U.S. Bank National Association, as trustee. The indenture contains the full legal text of the matters described in this section. We have summarized select portions of the indenture below. The summary is not complete and is subject to and qualified in its entirety by reference to all the provisions of the indenture, including definitions of the terms used in the indenture. Whenever we refer to particular sections or defined terms of the indenture in this prospectus or in a prospectus supplement, those sections or defined terms are incorporated by reference into this prospectus or the applicable prospectus supplement, and this summary also is subject to and qualified by reference to the description of the particular terms of a particular series of debt securities described in the applicable prospectus supplement. The form of the indenture has been filed as an exhibit to the Registration Statement of which this prospectus is a part and you should read the indenture for provisions that may be important to you. Capitalized terms used in the summary and not defined herein have the meanings specified in the indenture.

As used in this “Description of Debt Securities and Related Guarantees,” references to the “operating partnership,” “we,” “our” or “us” refer solely to Kilroy Realty, L.P. and not to any of its subsidiaries and references to the “Company” or “guarantor” refer solely to Kilroy Realty Corporation and not to any of its subsidiaries, unless otherwise expressly stated or the context otherwise requires.

General

The terms of each series of debt securities will be established by or pursuant to a resolution of the Company’s board of directors and set forth or determined in the manner provided in a resolution of the Company’s board of directors, in an officer’s certificate or by a supplemental indenture. The particular terms of each series of debt securities, along with any applicable modifications of or additions to the general terms of the debt securities as described in this prospectus, will be described in a prospectus supplement relating to such series (including any pricing supplement or term sheet). A prospectus supplement, pricing supplement or term sheet may change any of the terms of the debt securities described in this prospectus.

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Unless we state otherwise in the applicable prospectus supplement, we can issue an unlimited amount of the operating partnership’s debt securities under the indenture that may be in one or more series with the same or various maturities, at par, at a premium, or at a discount. We will set forth in a prospectus supplement (including any pricing supplement or term sheet) relating to any series of debt securities being offered, the aggregate principal amount and the following terms of the debt securities, if applicable:

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As discussed above, we may issue debt securities of the operating partnership that provide for an amount less than their stated principal amount to be due and payable upon declaration of acceleration of their maturity pursuant to the terms of the indenture. In addition, we may denominate the purchase price of any of the debt securities in a foreign currency or currencies or a foreign currency unit or units, and the principal of and any premium and interest on any series of debt securities may be payable in a foreign currency or currencies or a foreign currency unit or units. The applicable prospectus supplement will provide you with information on the federal income tax considerations and other special considerations applicable to any such debt securities.

No Protection in the Event of a Change of Control

Unless we state otherwise in the applicable prospectus supplement, the debt securities of any series will not contain any provisions which may afford holders of the debt securities of such series protection in the event the operating partnership or the Company has a change of control or in the event of a highly leveraged transaction (whether or not such transaction results in a change of control), which could adversely affect holders of debt securities.

Covenants

We will set forth in the applicable prospectus supplement any restrictive covenants applicable to any issue of any series of debt securities.

Merger, Consolidation and Sale of Assets

Unless we state otherwise in the applicable prospectus supplement, the operating partnership and the Company may consolidate with, or sell, lease or convey all or substantially all of their respective assets to, or merge with or into, any other entity, provided that the following conditions are met:

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Upon any such merger, consolidation or conveyance, the resulting, surviving or transferee person shall succeed to, and may exercise every right and power of, the operating partnership or the Company, as the case may be, under the indenture.

Events of Default

Unless we state otherwise in the applicable prospectus supplement, the indenture provides that the following events are “Events of Default” with respect to any series of debt securities:

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A supplemental indenture or officer’s certificate establishing the terms of a particular series of debt securities may delete, modify or add to the Events of Default described above.

If an Event of Default with respect to the debt securities of a particular series occurs and is continuing (other than an Event of Default specified in the last bullet above, which shall result in an automatic acceleration), then in every case the trustee or the holders of not less than 25% in principal amount of the outstanding debt securities of such series may declare the principal amount of, and accrued and unpaid interest on, all of the debt securities of such series to be due and payable immediately by written notice thereof to the operating partnership and the Company (and to the trustee if given by the holders). However, at any time after the declaration of acceleration (or automatic acceleration) with respect to the debt securities of such series has occurred, but before a judgment or decree for payment of the money due has been obtained by the trustee, the holders of not less than a majority in principal amount of the debt securities of such series outstanding may rescind and annul the declaration and its consequences if:

The indenture also provides that the holders of not less than a majority in principal amount of the outstanding debt securities of any series may waive any past default or Event of Default with respect to the debt securities of such series and its consequences, except, among other things, a default:

The trustee will be required to give notice to the holders of the debt securities of any particular series within 90 days of a default under the indenture with respect to the debt securities of such series known to a responsible officer (as defined in the indenture) of the trustee unless the default has been cured or waived; provided, however, that the trustee may withhold notice to the holders of the debt securities of such series of any default with respect to the debt securities of such series (except a default in the payment of the principal of or premium, if any or interest on the debt securities of such series) if responsible officers of the trustee in good faith determine the withholding to be in the interest of the holders of the debt securities of such series; and provided, further, that in the case of a default with respect to the debt securities of any series of the character specified in the penultimate bullet point of the first paragraph under this caption “Events of Default,” no such notice to holders of debt securities of such series shall be given until at least 60 days after the occurrence thereof.

The indenture provides that no holder of the debt securities of a particular series may institute any action or proceedings, judicial or otherwise, with respect to the indenture or for any remedy thereunder, unless:

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This provision will not prevent, however, any holder of the debt securities of any series from instituting suit for the enforcement of payment of the principal of or premium if any, or interest on such debt securities on or after the respective due dates thereof.

Subject to provisions in the indenture relating to its duties in case of default, the trustee will be under no obligation to exercise any of its rights or powers under the indenture at the request or direction of any holders of debt securities of any series then outstanding under the indenture, unless the holders of debt securities of such series shall have offered to the trustee reasonable security or indemnity. The holders of not less than a majority in principal amount of the outstanding debt securities of any series shall have the right to direct the time, method and place of conducting any proceeding for any remedy available to the trustee, or of exercising any trust or power conferred upon the trustee with respect to the debt securities of such series. However, the trustee may refuse to follow any direction which is in conflict with any law or the indenture or which may involve the trustee in personal liability or be unduly prejudicial to the holders of the debt securities of such series not joining therein.

Within 120 days after the close of each fiscal year, the operating partnership and the Company must deliver a certificate of an officer certifying to the trustee whether or not the officer has knowledge of any default under the indenture and, if so, specifying each default and the nature and status thereof.

Modification, Waiver and Meetings

Unless we state otherwise in the applicable prospectus supplement, modifications and amendments of the indenture will be permitted to be made pursuant to a supplemental indenture entered into by the operating partnership, the Company and the trustee with the consent of the holders of not less than a majority in principal amount of all outstanding debt securities of each series affected by such supplemental indenture (including consent obtained in connection with a tender offer or exchange offer for the outstanding debt securities of such series); provided, however, that no modification or amendment may, without the consent of the holder of each debt security affected thereby:

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Notwithstanding the foregoing, modifications and amendments of the indenture will be permitted to be made by supplemental indenture executed by the operating partnership, the Company and the trustee without the consent of any holder of the debt securities for, among other things, any of the following purposes:

The operating partnership and the Company may omit in any particular instance to comply with certain specified covenants in the indenture with respect to the debt securities of any series (which, if expressly stated in the prospectus supplement applicable to the debt securities of such series, may include any additional covenants specified in such prospectus supplement) if the holders of at least a majority in principal amount of all outstanding debt securities of such series waive such compliance. In determining whether the holders of the

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requisite principal amount of outstanding debt securities have given any request, demand, authorization, direction, notice, consent or waiver under the indenture or whether a quorum is present at a meeting of holders of debt securities, the indenture provides that debt securities owned by the operating partnership, the Company or any other obligor upon the debt securities or the guarantees thereof or any affiliate of the operating partnership, the Company, or of any other such obligor shall be disregarded.

The indenture contains provisions for convening meetings of the holders of debt securities of any series. A meeting of the holders of debt securities of any series will be permitted to be called at any time by the trustee, and also, upon request, by the operating partnership or the holders of at least 25% in principal amount of the outstanding debt securities of such series, in any case upon notice given as provided in the indenture. Except for any consent that must be given by the holder of each debt security affected by certain modifications and amendments of the indenture, any resolution presented at a meeting or adjourned meeting duly reconvened at which a quorum is present will be permitted to be adopted by the affirmative vote of the holders of a majority in principal amount of the outstanding debt securities of such series; provided, however, that, except for any consent that must be given by the holder of each debt security affected as referred to above, any resolution with respect to any request, demand, authorization, direction, notice, consent, waiver or other action that may be made, given or taken by the holders of a specified percentage, which is less than a majority, in principal amount of the outstanding debt securities of such series may be adopted at a meeting or adjourned meeting duly reconvened at which a quorum is present by the affirmative vote of the holders of the specified percentage in principal amount of the outstanding debt securities of such series. Any resolution passed or decision taken at any meeting of holders of debt securities of any series duly held in accordance with the indenture will be binding on all holders of the debt securities of such series. The quorum at any meeting called to adopt a resolution, and at any reconvened meeting, of the debt securities of any series will be holders of a majority in principal amount of the outstanding debt securities of such series; provided, however, that if any action is to be taken at the meeting with respect to a request, demand, authorization, direction, notice, consent, waiver or other action which may be given by the holders of not less than a specified percentage in principal amount of the outstanding debt securities of such series, holders of the specified percentage in principal amount of the outstanding debt securities of such series will constitute a quorum with respect to that matter. In the absence of a quorum at the reconvening of any adjourned meeting, such adjourned meeting may be further adjourned for a period of not less than ten days; at the reconvening of any meeting adjourned or further adjourned for lack of a quorum, the persons entitled to vote 25% in aggregate principal amount of the then outstanding debt securities of such series shall constitute a quorum.

Notwithstanding the foregoing provisions, if any action is to be taken at a meeting of holders of debt securities of any series with respect to any request, demand, authorization, direction, notice, consent, waiver or other action that the indenture expressly provides may be taken by holders of such series and one or more additional series acting collectively and voting together as a single class, there shall be no minimum quorum requirement for that meeting and the principal amount of outstanding debt securities of all such series that are entitled to vote in favor of that request, demand, authorization, direction, notice, consent, waiver or other action shall be taken into account in determining whether such action has been made, given or taken under the indenture.

Discharge, Defeasance and Covenant Defeasance

Unless we state otherwise in the applicable prospectus supplement, the indenture shall cease to be of further effect with respect to any series of debt securities, and the Company shall be released from its guarantee of the debt securities of such series (subject to the survival of a limited number of specified provisions) when:

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The indenture provides that the operating partnership may elect:

To effect legal defeasance or covenant defeasance, the operating partnership will be required to make an irrevocable deposit with the trustee, in trust for such purpose, of money and/or Government Obligations that, through the scheduled payment of interest and principal in accordance with their terms, will provide money in an amount sufficient to pay and discharge the principal, premium, if any, and interest on the debt securities of such series on the scheduled due dates or the applicable redemption date, as the case may be, in accordance with the terms of the indenture and the debt securities of such series. Upon any legal defeasance (but not covenant defeasance) the Company will be released from its guarantee of the debt securities of such series.

The trust described in the preceding paragraph may only be established if, among other things:

In the event we effect covenant defeasance with respect to the debt securities of any series, then any failure by the operating partnership or the Company to comply with any covenant as to which there has been covenant defeasance will not constitute an Event of Default. However, if the debt securities of such series are declared due

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and payable because of the occurrence of any other Event of Default, the amount of monies and/or Government Obligations deposited with the trustee to effect such covenant defeasance may not be sufficient to pay amounts due on the debt securities of such series at the time of any acceleration resulting from such Event of Default. However, the operating partnership and the Company would remain liable to make payment of such amounts due at the time of acceleration.

Governing Law

The indenture, the debt securities and any guarantees endorsed on the certificates evidencing the debt securities will be governed by, and construed in accordance with, the internal laws of the State of New York.

Book-entry System

The Global Notes

The debt securities of each series will be initially issued in the form of one or more registered debt securities in global form, without interest coupons, or the global notes. Upon issuance, each of the global notes will be deposited with the trustee as custodian for The Depository Trust Company, or DTC, and registered in the name of Cede & Co., as nominee of DTC.

Ownership of beneficial interests in a global note will be limited to persons who have accounts with DTC, or DTC participants, or persons who hold interests through DTC participants. We expect that under procedures established by DTC:

Beneficial interests in global notes may not be exchanged for notes in physical, certificated form except in the limited circumstances described below.

Book-entry Procedures for the Global Notes

All interests in the global notes will be subject to the operations and procedures of DTC. We provide the following summary of those operations and procedures solely for the convenience of investors. The operations and procedures of DTC are controlled by that settlement system and may be changed at any time. None of the operating partnership, the Company or the applicable underwriters are responsible for those operations or procedures.

DTC has advised us that it is:

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DTC was created to hold securities for its participants and to facilitate the clearance and settlement of securities transactions between its participants through electronic book-entry changes to the accounts of its participants. DTC’s participants include securities brokers and dealers, including underwriters, banks and trust companies, clearing corporations and other organizations. Indirect access to DTC’s system is also available to others such as banks, brokers, dealers and trust companies; these indirect participants clear through or maintain a custodial relationship with a DTC participant, either directly or indirectly. Investors who are not DTC participants may beneficially own securities held by or on behalf of DTC only through DTC participants or indirect participants in DTC.

So long as DTC’s nominee is the registered owner of a global note, that nominee will be considered the sole owner or holder of the debt securities represented by that global note for all purposes under the indenture. Except as provided below, owners of beneficial interests in a global note:

As a result, each investor who owns a beneficial interest in a global note of any series must rely on the procedures of DTC to exercise any rights of a holder of debt securities of such series under the indenture (and, if the investor is not a participant or an indirect participant in DTC, on the procedures of the direct, or, if applicable, indirect DTC participant through which the investor owns its interest).

Payments of principal, premium, if any, and interest with respect to the debt securities represented by a global note will be made by the trustee to DTC or DTC’s nominee as the registered holder of the global note. Neither the operating partnership, the Company nor the trustee will have any responsibility or liability for the payment of amounts to owners of beneficial interests in a global note, for any aspect of the records relating to or payments made on account of those interests by DTC, or for maintaining, supervising or reviewing any records of DTC relating to those interests.

Payments by participants and indirect participants in DTC to the owners of beneficial interests in a global note will be governed by standing instructions and customary industry practice and will be the responsibility of those participants or indirect participants and DTC.

Transfers between participants in DTC will be effected under DTC’s procedures and will be settled in same-day funds.

Certificated Notes

If the Debt securities of any series are initially issued as global notes, debt securities of such series in physical, certificated form will be issued and delivered to each person that DTC identifies as a beneficial owner of the debt securities of such series only if:

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DESCRIPTION OF CAPITAL STOCK

The following is a summary of some of the terms and provisions of the capital stock of Kilroy Realty Corporation. The following description does not purport to be complete and is subject to, and qualified in its entirety by reference to, the provisions of the Company’s charter (including, without limitation, the articles supplementary (the “Articles Supplementary”) establishing the terms of the Company’s 6.875% Series G Cumulative Redeemable Preferred Stock (the “Series G preferred stock”) and 6.375% Series H Cumulative Redeemable Preferred Stock (the “Series H preferred stock”)) incorporated by reference to our SEC filings. See “Where You Can Find More Information.” As used in this “Description of Capital Stock,” references to the “Company,” “we,” “our” or “us” refer solely to Kilroy Realty Corporation and not to any of its subsidiaries, unless otherwise expressly stated or the context otherwise requires.

Common Stock

General

The Company’s charter authorizes us to issue 150,000,000 shares of common stock, par value $.01 per share. As of September 23, 2016, we had 92,270,393 shares of common stock outstanding. The number of outstanding shares of common stock excludes the following as of September 23, 2016: (i) 286,000 shares of common stock issuable upon exercise of options granted under our equity compensation plans; (ii) 1,353,349 additional shares of common stock reserved and available for issuance under our equity compensation plans; (iii) 2,043,999 shares of common stock underlying restricted stock units awarded under our stock award deferral program; (iv) 2,631,276 shares of common stock issuable upon redemption of common units of the operating partnership outstanding; and (v) a total of up to 9,236,100 shares of our common stock (subject to certain anti-dilution and other potential adjustments) issuable upon conversion of our Series G preferred stock and Series H preferred stock following a “Change of Control” (as defined in the terms of the Series G preferred stock and Series H preferred stock, respectively) of us.

Shares of our common stock:

We may pay distributions on shares of the Company’s common stock, subject to the preferential rights of the Company’s Series G preferred stock, the Company’s Series H preferred stock and any other series or class of capital stock that we may issue in the future with rights to dividends and other distributions senior to the Company’s common stock. However, we may only pay distributions when the board of directors (in its sole discretion) authorizes a distribution out of legally available funds.

The Company’s board of directors may:

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Certain Provisions of the Maryland General Corporation Law

Under the Maryland General Corporation Law, or the MGCL, the Company’s stockholders are generally not liable for our debts or obligations. If we liquidate, we will first pay all debts and other liabilities, including debts and liabilities arising out of the Company’s status as general partner of the operating partnership, and, second, any preferential distributions on any outstanding shares of our preferred stock. Each holder of the Company’s common stock then will share ratably in our remaining assets. All shares of the Company’s common stock have equal distribution, liquidation and voting rights, and have no preference or exchange rights, subject to the ownership limits in the Company’s charter or as permitted by the board of directors pursuant to executed agreements waiving these ownership limits with respect to specific stockholders.

Under the MGCL, we generally require approval by the Company’s stockholders by the affirmative vote of at least two-thirds of the votes entitled to vote before we can:

Because the term “substantially all” of a company’s assets is not defined in the MGCL, it is subject to Maryland common law and to judicial interpretation and review in the context of the unique facts and circumstances of any particular transaction. Although the MGCL allows the Company’s charter to establish a lesser percentage of affirmative votes by the Company’s stockholders for approval of those actions, the Company’s charter does not include such a provision.

Preferred Stock

The Company’s charter authorizes us to issue 30,000,000 shares of preferred stock, par value $.01 per share. Of the 30,000,000 authorized shares of preferred stock, we have classified and designated 4,600,000 shares as Series G preferred stock and 4,000,000 shares as Series H preferred stock. As of September 23, 2016, 4,000,000 shares of the Company’s Series G preferred stock are issued and outstanding and 4,000,000 shares of Series H preferred stock are issued and outstanding.

We may classify, designate and issue additional shares of currently authorized shares of preferred stock, in one or more classes or series, as authorized by the board of directors without the prior consent of the Company’s stockholders. The board of directors may grant the holders of preferred stock of any class or series preferences, powers and rights—voting or otherwise—senior to the rights of holders of shares of the Company’s common stock. The board of directors can authorize the issuance of currently authorized shares of preferred stock with terms and conditions that could have the effect of delaying or preventing a change of control transaction that might involve a premium price for holders of shares of the Company’s common stock or otherwise be in their

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best interest. All shares of preferred stock which are issued and are or become outstanding are or will be fully paid and nonassessable. Before we may issue any shares of preferred stock of any class or series, the MGCL and the Company’s charter require the board of directors to determine the following with respect to such class or series:

6.875% Series G Cumulative Redeemable Preferred Stock

General

Of the Company’s 30,000,000 authorized preferred shares, 4,600,000 shares have been classified and designated as 6.875% Series G Cumulative Redeemable Preferred Stock. Of these shares, as of September 23, 2016, 4,000,000 are issued and outstanding.

Dividends

Each share of Series G preferred stock is entitled to receive, when, as, and if authorized by the Company’s board of directors and declared by us, out of funds legally available for the payment of dividends, cumulative cash dividends at the rate of 6.875% of the $25.00 per share liquidation preference per annum (equivalent to $1.71875 per annum per share), payable quarterly in arrears on February 15, May 15, August 15 and November 15 of each year.

Except as provided in the immediately following paragraph, unless full cumulative dividends for all past dividend periods on the Series G preferred stock have been or contemporaneously are declared and paid or declared and a sum sufficient for the payment thereof is set apart for such payment, no dividends (other than in shares of the Company’s common stock or shares of any other class or series of stock of the Company ranking junior to the Series G preferred stock as to dividends and as to the distribution of assets upon liquidation, dissolution and winding up of the Company) shall be declared or paid or set aside for payment nor shall any other distribution be declared or made on the Company’s common stock or any other class or series of stock of the Company ranking junior to or on a parity with the Series G preferred stock as to dividends or as to the distribution of assets upon liquidation, dissolution or winding up of the Company, nor shall any shares of the Company’s common stock or any other class or series of stock of the Company ranking junior to or on a parity with the Series G preferred stock as to dividends or as to the distribution of assets upon liquidation, dissolution or winding up of the Company be redeemed, purchased or otherwise acquired for any consideration (or any amounts be paid to or made available for a sinking fund for the redemption of any shares of any such stock) by the Company (except by conversion into or exchange for shares of the Company’s common stock or shares of any other class or series of stock of the Company ranking junior to the Series G preferred stock as to dividends and as to the distribution of assets upon liquidation, dissolution and winding up of the Company); provided, however, that the foregoing shall not prevent the purchase or acquisition of shares of the Company’s stock to preserve the Company’s status as a real estate investment trust, or REIT, for federal and/or state income tax purposes. With

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respect to the Series G preferred stock, all references to “past dividend periods” shall mean, as of any date, dividend periods ending on or prior to such date, and with respect to shares of any other class or series of stock ranking on a parity as to dividends with the Series G preferred stock, “past dividend periods” shall mean, as of any date, dividend periods with respect to such other class or series of stock ending on or prior to such date.

When full cumulative dividends for all past dividend periods are not paid in full (or a sum sufficient for the full payment is not set apart) upon the shares of Series G preferred stock and when full cumulative dividends for all past dividend periods are not paid in full (or a sum sufficient for such full payment is not so set apart) upon the shares of any other class or series of the Company’s stock ranking on a parity as to dividends with the Series G preferred stock, then all dividends declared on shares of Series G preferred stock and any other outstanding classes or series of the Company’s stock ranking on a parity as to dividends with the Series G preferred stock shall be declared pro rata so that the amount of dividends declared per share on the Series G preferred stock and such other classes or series of stock ranking on a parity as to dividends with the Series G preferred stock shall in all cases bear to each other the same ratio that accumulated and unpaid dividends per share on the shares of Series G preferred stock and such other classes or series of stock ranking on a parity as to dividends with the Series G preferred stock (which, in the case of any such other class or series of stock ranking on a parity as to dividends with the Series G preferred stock, shall not include any accumulation in respect of unpaid dividends for past dividend periods if such other class or series of stock ranking on a parity as to dividends with the Series G preferred stock does not have a cumulative dividend) bear to each other.

Ranking

The Series G preferred stock will, with respect to dividends and rights upon the distribution of assets upon the Company’s voluntary or involuntary liquidation, dissolution or winding-up, rank:

Redemption

The Series G preferred stock will not be redeemable before March 27, 2017, except to preserve our status as a REIT for federal and/or state income tax purposes and except as described below upon the occurrence of a Series G Change of Control (as defined below). On and after March 27, 2017, we may, at our option, redeem any or all of the shares of the Series G preferred stock, for cash, at $25.00 per share plus, subject to exceptions, any accrued and unpaid dividends to but excluding the date fixed for redemption.

Upon the occurrence of a Series G Change of Control, we may, at our option, at any time or from time to time, redeem any or all of the shares of Series G preferred stock, within 120 days after the first date on which such Series G Change of Control occurred, for cash, at $25.00 per share plus, subject to exceptions, any accrued and unpaid dividends to but excluding the date fixed for redemption. If, prior to the Series G Change of Control Conversion Date (as defined below), we have provided or provide notice of our election to redeem some or all of the shares of Series G preferred stock (whether pursuant to our optional redemption right described in the paragraph above or the special optional redemption right described in this paragraph), the holders of Series G preferred stock will not have the conversion right described below under “—Conversion Rights” with respect to the shares of Series G preferred stock called for redemption.

A “Series G Change of Control” is when the following have occurred and are continuing:

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The “Series G Change of Control Conversion Date” is the date the Series G preferred stock is to be converted into the Company’s common stock, which will be a business day selected by the Company that is no fewer than 20 days nor more than 35 days after the date on which the Company provides a notice of the occurrence of the Series G Change of Control that describes the resulting Series G Change of Control Conversion Right to the holders of Series G preferred stock.

Conversion Rights

Upon the occurrence of a Series G Change of Control, each holder of Series G preferred stock will have the right, which we refer to as the Series G Change of Control Conversion Right (unless, prior to the Series G Change of Control Conversion Date, the Company has provided notice of its election to redeem some or all of the shares of Series G preferred stock held by such holder pursuant to the redemption provisions described above under “—Redemption,” in which case such holder will have the right only with respect to shares of Series G preferred stock that are not called for redemption) to convert some or all of the Series G preferred stock held by such holder on the Series G Change of Control Conversion Date, into a number of shares of the Company’s common stock per share of Series G preferred stock equal to the lesser of:

subject, in each case, to provisions for the receipt of alternative consideration under specified circumstances as set forth in the Articles Supplementary for the Series G preferred stock.

The “Series G Common Stock Price” is (i) if the consideration to be received in the Series G Change of Control by the holders of the Company’s common stock is solely cash, the amount of cash consideration per share of the Company’s common stock or (ii) if the consideration to be received in the Series G Change of Control by holders of the Company’s common stock is other than solely cash (x) the average of the closing sale prices per share of the Company’s common stock (or, if no closing sale price is reported, the average of the closing bid and ask prices per share or, if more than one in either case, the average of the average closing bid and the average closing ask prices per share) for the ten consecutive trading days immediately preceding, but not including, the date on which such Series G Change of Control occurred as reported on the principal U.S. securities exchange on which the Company’s common stock is then traded, or (y) the average of the last quoted

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bid prices for the Company’s common stock in the over-the-counter market as reported by Pink OTC Markets Inc. or similar organization for the ten consecutive trading days immediately preceding, but not including, the date on which such Series G Change of Control occurred, if the Company’s common stock is not then listed for trading on a U.S. securities exchange.

No Maturity, Sinking Fund or Mandatory Redemption

The Series G preferred stock has no maturity date, and the Company is not required to redeem the Series G preferred stock at any time. Accordingly, the shares of Series G preferred stock will remain outstanding indefinitely, unless the Company decides, at its option, to exercise its redemption rights or otherwise repurchase them or they become convertible and are converted in the manner set forth in Articles Supplementary for the Series G preferred stock. None of the Series G preferred stock is subject to any sinking fund.

Limited Voting Rights

Holders of Series G preferred stock do not have any voting rights except as set forth below. Whenever dividends on any shares of Series G preferred stock are in arrears for six or more quarterly periods, whether or not consecutive, the holders of Series G preferred stock will have the right to vote as a single class with all other classes or series of stock ranking on parity with the Series G preferred stock upon which like voting rights have been conferred and are exercisable for the election of two additional directors to the board of directors. The election will take place at:

When all of the dividends in arrears have been paid or declared and provided for in full, the right of holders of the Series G preferred stock to elect those two directors will cease and, unless there are one or more other classes or series of the Company’s preferred stock ranking on a parity with the Series G preferred stock upon which like voting rights have been conferred and are exercisable, the term of office of the two directors shall automatically terminate and the number of directors constituting the board of directors shall be reduced accordingly.

In addition, so long as any shares of Series G preferred stock are outstanding, without the consent or affirmative vote of at least two-thirds of the shares of Series G preferred stock then outstanding, the Company may not:

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provided that any amendment to the Company’s charter to increase the number of authorized shares of stock or the creation or issuance of any other class or series of preferred stock or any increase in the number of authorized or outstanding shares of Series G preferred stock or any other class or series of stock, in each case ranking on a parity with or junior to the Series G preferred stock with respect to payment of dividends and the distribution of assets upon liquidation, dissolution and winding up, shall not be deemed to materially and adversely affect any right, preference, privilege or voting power of the Series G preferred stock.

On each matter on which holders of Series G preferred stock are entitled to vote, each share of Series G preferred stock will be entitled to one vote, except that when shares of any other class or series of the Company’s preferred stock have the right to vote with the Series G preferred stock as a single class on any matter, the Series G preferred stock and the shares of each such other class or series will have one vote for each $50.00 of liquidation preference (excluding accrued and unpaid dividends), resulting in each share of Series G preferred stock being entitled to one-half of a vote under such circumstances.

Except as expressly stated in the Articles Supplementary for the Series G preferred stock, the Series G preferred stock will not have any relative, participating, optional or other special voting rights or powers and the consent of the holders shall not be required for the taking of any corporate action.

The voting provisions above will not apply if, at or prior to the time when the act with respect to which the vote would otherwise be required would occur, all outstanding shares of Series G preferred stock shall have been redeemed or called for redemption upon proper notice and sufficient funds shall have been irrevocably deposited in trust to effect the redemption.

Liquidation Preference

Upon any voluntary or involuntary liquidation, dissolution or winding-up of the Company, each share of Series G preferred stock is entitled to receive, out of our assets legally available for distribution to stockholders, a liquidation distribution of $25.00 per share, plus any accrued but unpaid dividends, in preference to any of the Company’s common stock or any other class or series of the Company’s stock ranking junior to the Series G preferred stock, but subject to the preferential rights of any class or series of our preferred stock ranking senior to the Series G preferred stock.

6.375% Series H Cumulative Redeemable Preferred Stock

General

Of the Company’s 30,000,000 authorized preferred shares, 4,000,000 shares have been classified and designated as 6.375% Series H Cumulative Redeemable Preferred Stock. Of these shares, as of September 23, 2016, 4,000,000 are issued and outstanding.

Dividends

Each share of Series H preferred stock is entitled to receive, when, as, and if authorized by the Company’s board of directors and declared by us, out of funds legally available for the payment of dividends, cumulative

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cash dividends at the rate of 6.375% of the $25.00 per share liquidation preference per annum (equivalent to $1.59375 per annum per share), payable quarterly in arrears on February 15, May 15, August 15 and November 15 of each year.

Except as provided in the immediately following paragraph, unless full cumulative dividends for all past dividend periods on the Series H preferred stock have been or contemporaneously are declared and paid or declared and a sum sufficient for the payment thereof is set apart for such payment, no dividends (other than in shares of the Company’s common stock or shares of any other class or series of stock of the Company ranking junior to the Series H preferred stock as to dividends and as to the distribution of assets upon liquidation, dissolution and winding up of the Company) shall be declared or paid or set aside for payment nor shall any other distribution be declared or made on the Company’s common stock or any other class or series of stock of the Company ranking junior to or on a parity with the Series H preferred stock as to dividends or as to the distribution of assets upon liquidation, dissolution or winding up of the Company, nor shall any shares of the Company’s common stock or any other class or series of stock of the Company ranking junior to or on a parity with the Series H preferred stock as to dividends or as to the distribution of assets upon liquidation, dissolution or winding up of the Company be redeemed, purchased or otherwise acquired for any consideration (or any amounts be paid to or made available for a sinking fund for the redemption of any shares of any such stock) by the Company (except by conversion into or exchange for shares of the Company’s common stock or shares of any other class or series of stock of the Company ranking junior to the Series H preferred stock as to dividends and as to the distribution of assets upon liquidation, dissolution and winding up of the Company); provided, however, that the foregoing shall not prevent the purchase or acquisition of shares of the Company’s stock to preserve the Company’s status as a REIT for federal and/or state income tax purposes. With respect to the Series H preferred stock, all references to “past dividend periods” shall mean, as of any date, dividend periods ending on or prior to such date, and with respect to shares of any other class or series of stock ranking on a parity as to dividends with the Series H preferred stock, “past dividend periods” shall mean, as of any date, dividend periods with respect to such other class or series of stock ending on or prior to such date.

When full cumulative dividends for all past dividend periods are not paid in full (or a sum sufficient for the full payment is not set apart) upon the shares of Series H preferred stock and when full cumulative dividends for all past dividend periods are not paid in full (or a sum sufficient for such full payment is not so set apart) upon the shares of any other class or series of the Company’s stock ranking on a parity as to dividends with the Series H preferred stock, then all dividends declared on shares of Series H preferred stock and any other outstanding classes or series of the Company’s stock ranking on a parity as to dividends with the Series H preferred stock shall be declared pro rata so that the amount of dividends declared per share on the Series H preferred stock and such other classes or series of stock ranking on a parity as to dividends with the Series H preferred stock shall in all cases bear to each other the same ratio that accumulated and unpaid dividends per share on the shares of Series H preferred stock and such other classes or series of stock ranking on a parity as to dividends with the Series H preferred stock (which, in the case of any such other class or series of stock ranking on a parity as to dividends with the Series H preferred stock, shall not include any accumulation in respect of unpaid dividends for past dividend periods if such other class or series of stock ranking on a parity as to dividends with the Series H preferred stock does not have a cumulative dividend) bear to each other.

Ranking

The Series H preferred stock will, with respect to dividends and rights upon the distribution of assets upon the Company’s voluntary or involuntary liquidation, dissolution or winding-up, rank:

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Redemption

The Series H preferred stock will not be redeemable before August 15, 2017, except to preserve our status as a REIT for federal and/or state income tax purposes and except as described below upon the occurrence of a Series H Change of Control (as defined below). On and after August 15, 2017, we may, at our option, redeem any or all of the shares of the Series H preferred stock, for cash, at $25.00 per share plus, subject to exceptions, any accrued and unpaid dividends to but excluding the date fixed for redemption.

Upon the occurrence of a Series H Change of Control, we may, at our option, at any time or from time to time, redeem any or all of the shares of Series H preferred stock, within 120 days after the first date on which such Series H Change of Control occurred, for cash, at $25.00 per share plus, subject to exceptions, any accrued and unpaid dividends to but excluding the date fixed for redemption. If, prior to the Series H Change of Control Conversion Date (as defined below), we have provided or provide notice of our election to redeem some or all of the shares of Series H preferred stock (whether pursuant to our optional redemption right described in the paragraph above or the special optional redemption right described in this paragraph), the holders of Series H preferred stock will not have the conversion right described below under “—Conversion Rights” with respect to the shares of Series H preferred stock called for redemption.

A “Series H Change of Control” is when the following have occurred and are continuing:

The “Series H Change of Control Conversion Date” is the date the Series H preferred stock is to be converted into the Company’s common stock, which will be a business day selected by the Company that is no fewer than 20 days nor more than 35 days after the date on which the Company provides a notice of the occurrence of the Series H Change of Control that describes the resulting Series H Change of Control Conversion Right to the holders of Series H preferred stock.

Conversion Rights

Upon the occurrence of a Series H Change of Control, each holder of Series H preferred stock will have the right, which we refer to as the Series H Change of Control Conversion Right (unless, prior to the Series H Change of Control Conversion Date, the Company has provided notice of its election to redeem some or all of the shares of Series H preferred stock held by such holder pursuant to the redemption provisions described above under “—Redemption,” in which case such holder will have the right only with respect to shares of Series H preferred stock that are not called for redemption) to convert some or all of the Series H preferred stock held by such holder on the Series H Change of Control Conversion Date, into a number of shares of the Company’s common stock per share of Series H preferred stock equal to the lesser of:

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subject, in each case, to provisions for the receipt of alternative consideration under specified circumstances as set forth in the Articles Supplementary for the Series H preferred stock.

The “Series H Common Stock Price” is (i) if the consideration to be received in the Series H Change of Control by the holders of the Company’s common stock is solely cash, the amount of cash consideration per share of the Company’s common stock or (ii) if the consideration to be received in the Series H Change of Control by holders of the Company’s common stock is other than solely cash (x) the average of the closing sale prices per share of the Company’s common stock (or, if no closing sale price is reported, the average of the closing bid and ask prices per share or, if more than one in either case, the average of the average closing bid and the average closing ask prices per share) for the ten consecutive trading days immediately preceding, but not including, the date on which such Series H Change of Control occurred as reported on the principal U.S. securities exchange on which the Company’s common stock is then traded, or (y) the average of the last quoted bid prices for the Company’s common stock in the over-the-counter market as reported by Pink OTC Markets Inc. or similar organization for the ten consecutive trading days immediately preceding, but not including, the date on which such Series H Change of Control occurred, if the Company’s common stock is not then listed for trading on a U.S. securities exchange.

No Maturity, Sinking Fund or Mandatory Redemption

The Series H preferred stock has no maturity date, and the Company is not required to redeem the Series H preferred stock at any time. Accordingly, the shares of Series H preferred stock will remain outstanding indefinitely, unless the Company decides, at its option, to exercise its redemption rights or otherwise repurchase them or they become convertible and are converted in the manner set forth in Articles Supplementary for the Series H preferred stock. None of the Series H preferred stock is subject to any sinking fund.

Limited Voting Rights

Holders of Series H preferred stock do not have any voting rights except as set forth below. Whenever dividends on any shares of Series H preferred stock are in arrears for six or more quarterly periods, whether or not consecutive, the holders of Series H preferred stock will have the right to vote as a single class with all other classes or series of stock ranking on parity with the Series H preferred stock upon which like voting rights have been conferred and are exercisable for the election of two additional directors to the board of directors. The election will take place at:

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When all of the dividends in arrears have been paid or declared and provided for in full, the right of holders of the Series H preferred stock to elect those two directors will cease and, unless there are one or more other classes or series of the Company’s preferred stock ranking on a parity with the Series H preferred stock upon which like voting rights have been conferred and are exercisable, the term of office of the two directors shall automatically terminate and the number of directors constituting the board of directors shall be reduced accordingly.

In addition, so long as any shares of Series H preferred stock are outstanding, without the consent or affirmative vote of at least two-thirds of the shares of Series H preferred stock then outstanding, the Company may not:

provided that any amendment to the Company’s charter to increase the number of authorized shares of stock or the creation or issuance of any other class or series of preferred stock or any increase in the number of authorized or outstanding shares of Series H preferred stock or any other class or series of stock, in each case ranking on a parity with or junior to the Series H preferred stock with respect to payment of dividends and the distribution of assets upon liquidation, dissolution and winding up, shall not be deemed to materially and adversely affect any right, preference, privilege or voting power of the Series H preferred stock.

On each matter on which holders of Series H preferred stock are entitled to vote, each share of Series H preferred stock will be entitled to one vote, except that when shares of any other class or series of the Company’s preferred stock have the right to vote with the Series H preferred stock as a single class on any matter, the Series H preferred stock and the shares of each such other class or series will have one vote for each $50.00 of liquidation preference (excluding accrued and unpaid dividends), resulting in each share of Series H preferred stock being entitled to one-half of a vote under such circumstances.

Except as expressly stated in the Articles Supplementary for the Series H preferred stock, the Series H preferred stock will not have any relative, participating, optional or other special voting rights or powers and the consent of the holders shall not be required for the taking of any corporate action.

The voting provisions above will not apply if, at or prior to the time when the act with respect to which the vote would otherwise be required would occur, all outstanding shares of Series H preferred stock shall have been redeemed or called for redemption upon proper notice and sufficient funds shall have been irrevocably deposited in trust to effect the redemption.

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Liquidation Preference

Upon any voluntary or involuntary liquidation, dissolution or winding-up of the Company, each share of Series H preferred stock is entitled to receive, out of our assets legally available for distribution to stockholders, a liquidation distribution of $25.00 per share, plus any accrued but unpaid dividends, in preference to any of the Company’s common stock or any other class or series of the Company’s stock ranking junior to the Series H preferred stock, but subject to the preferential rights of any class or series of our preferred stock ranking senior to the Series H preferred stock.

Restrictions on Ownership and Transfer of the Company’s Capital Stock

Internal Revenue Code Requirements

To maintain the Company’s tax status as a REIT, five or fewer “individuals,” as that term is defined in the Code, which includes certain entities, may not own, actually or constructively, more than 50% in value of the Company’s issued and outstanding capital stock at any time during the last half of a taxable year. Constructive ownership provisions in the Code determine if any individual or entity constructively owns the Company’s capital stock for purposes of this requirement. In addition, 100 or more persons must beneficially own the Company’s capital stock during at least 335 days of a taxable year or during a proportionate part of a short taxable year. Also, rent from tenants in which we actually or constructively own a 10% or greater interest is not qualifying income for purposes of the gross income tests of the Code. To help ensure we meet these tests, the Company’s charter restricts the acquisition and ownership of shares of the Company’s capital stock.

Transfer Restrictions in the Company’s Charter

Subject to exceptions specified therein, the Company’s charter provides that no holder may own, either actually or constructively under the applicable constructive ownership provisions of the Code:

In addition, because rent from tenants in which we actually or constructively own a 10% or greater interest is not qualifying rent for purposes of the gross income tests under the Code, the Company’s charter provides that no holder may own, either actually or constructively by virtue of the constructive ownership provisions of the Code, which differ from the constructive ownership provisions used for purposes of the preceding sentence:

We refer to the limits described in this paragraph and the preceding paragraph, together, as the “ownership limits.”

The constructive ownership provisions set forth in the Code are complex, and may cause shares of the Company’s capital stock owned actually or constructively by a group of related individuals and/or entities to be

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constructively owned by one individual or entity. As a result, the acquisition of shares of the Company’s capital stock in an amount that does not exceed the ownership limits, or the acquisition of an interest in an entity that actually or constructively owns the Company’s capital stock, could, nevertheless cause that individual or entity, or another individual or entity, to own constructively shares in excess of the ownership limits and thus violate the ownership limits described above or otherwise permitted by the Company’s board of directors.

The Company’s charter permits the board of directors to waive the ownership limits with respect to a particular stockholder if the board of directors:

As a condition of this waiver, the Company’s board of directors may require opinions of counsel satisfactory to it and/or undertakings or representations from the applicant with respect to preserving the Company’s REIT status. The board of directors has waived the ownership limit applicable to the Company’s common stock for John B. Kilroy, Sr. and John Kilroy, members of their families and some of their affiliated entities, allowing them to own up to 19.6% of the Company’s common stock. However, the board of directors conditioned this waiver upon the receipt of undertakings and representations from Messrs. Kilroy which it believed were reasonably necessary to conclude that the waiver would not cause us to fail to qualify and maintain the Company’s status as a REIT.

In addition to the foregoing ownership limits, the Company’s charter provides that no holder may own, either actually or constructively under the applicable attribution rules of the Code, any shares of any class of the Company’s capital stock if, as a result of this ownership:

Under the Company’s charter, any person who acquires or attempts or intends to acquire actual or constructive ownership of the Company’s shares of capital stock that violate any of the foregoing restrictions on transferability and ownership must give us notice immediately and provide us with any other information that we may request to determine the effect of the transfer on the Company’s status as a REIT. The foregoing restrictions on transferability and ownership will not apply if the Company’s board of directors determines that it is no longer in the Company’s best interest to attempt to qualify, or to continue to qualify, as a REIT.

Effect of Violation of Ownership Limits and Transfer Restrictions

The Company’s charter provides that if any attempted transfer of the Company’s capital stock or any other event would result in any person violating the ownership limits described above, unless otherwise permitted by the board of directors, then the purported transfer will be void ab initio and of no force or effect with respect to the attempted transferee as to that number of shares in excess of the applicable ownership limit, and the transferee shall acquire no right or interest in the excess shares. The Company’s charter further provides that in the case of any event other than a purported transfer, the person or entity holding record title to any of the excess shares shall cease to own any right or interest in the excess shares.

The Company’s charter provides that if any transfer or other event occurs that, if effective, would result in any person owning shares of Company’s capital stock in violation of the ownership limit described above, the

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number of shares of capital stock that otherwise would cause such person to violate the ownership limit (the “excess shares”) will be transferred automatically to a trust, the beneficiary of which will be a qualified charitable organization selected by us or, if for any reason that transfer is not automatically effective, then the transfer of such excess shares shall be void ab initio and the purported transferee will not have any rights in such excess shares. The automatic transfer will be effective as of the close of business on the business day prior to the date of the violative transfer.

The trustee of the charitable trust must:

Excess shares transferred to the charitable trust shall be deemed to have been offered for sale to us at a price per share equal to the lesser of the price paid by the prohibited transferee or owner for the excess shares (or, if the event which resulted in the transfer to the charitable shares did not involve the purchase of the applicable stock for fair value, the market price of such shares on the day of the event which resulted in the transfer of such shares to the charitable trust) and the market price on the date we accept such offer. We will have the right to accept such offer until the charitable trust has sold the excess shares as described above.

The trustee shall be designated by us and be unaffiliated with us and any prohibited transferee or owner. Prior to a sale of any excess shares by the trust, the trustee will receive, in trust for the beneficiary, all dividends and other distributions paid by us with respect to the excess shares, and may also exercise all voting rights with respect to the excess shares.

The Company’s charter provides that, subject to Maryland law, effective as of the date that the shares have been transferred to the trust, the trustee shall have the authority, at the trustee’s sole discretion:

However, if we have already taken irreversible corporate action, then the trustee may not rescind and recast the vote. Any dividend or other distribution paid to the prohibited transferee or owner, prior to our discovery that the shares had been automatically transferred to a trust as described above, must be repaid to the trustee upon demand for distribution to the beneficiary of the trust. If the transfer to the trust as described above is not automatically effective, for any reason, to prevent violation of the applicable ownership limit or as otherwise permitted by the board of directors, then the Company’s charter provides that the transfer of the excess shares will be void ab initio.

If shares of capital stock are transferred to any person in a manner which would cause us to be beneficially owned by fewer than 100 persons, the Company’s charter provides that the transfer shall be null and void in its entirety, and the intended transferee will acquire no rights to the stock.

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If the Company’s board of directors shall at any time determine in good faith that a person has acquired, intends to acquire or own, has attempted to acquire or own, or may acquire or own the Company’s capital stock in violation of the limits described above, the Company’s charter provides that the board of directors shall take actions to refuse to give effect to or to prevent the ownership or acquisition, including, but not limited to:

All certificates representing shares of the Company’s capital stock bear a legend referring to the restrictions described above.

All persons who own at least a specified percentage of the outstanding shares of the Company’s stock must file with us a completed questionnaire annually containing information about their ownership of the shares, as set forth in the applicable Treasury regulations. Under current Treasury regulations, the percentage is between 0.5% and 5.0%, depending on the number of record holders of the Company’s shares. In addition, each stockholder may be required to disclose to us in writing information about the actual and constructive ownership of the Company’s shares as the board of directors deems necessary to comply with the provisions of the Code applicable to a REIT or to comply with the requirements of any taxing authority or governmental agency.

These ownership limitations could discourage a takeover or other transaction in which holders of some, or a majority, of the Company’s shares of capital stock might receive a premium for their shares over the then prevailing market price or which stockholders might believe to be otherwise in their best interest.

Transfer Agent and Registrar for Shares of Capital Stock

Computershare Shareowner Services LLC is the transfer agent and registrar for shares of the Company’s preferred stock and common stock.

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DESCRIPTION OF WARRANTS

We may issue warrants for the purchase of the Company’s preferred stock or common stock. Warrants may be issued independently or together with any other offered securities offered by the applicable prospectus supplement and may be attached to or separate from such offered securities. Each series of warrants will be issued under a separate warrant agreement to be entered into between the Company and a warrant agent specified in the applicable prospectus supplement. The warrant agent will act solely as our agent in connection with the warrants of such series and will not assume any obligation or relationship of agency or trust for or with any provisions of the warrants offered hereby. Further terms of the warrants and the applicable warrant agreements will be set forth in the applicable prospectus supplement. As used in this “Description of Warrants,” references to the “Company,” “we,” “our” or “us” refer solely to Kilroy Realty Corporation and not to any of its subsidiaries, unless otherwise expressly stated or the context otherwise requires.

The applicable prospectus supplement will describe the terms of the warrants in respect of which this prospectus is being delivered, including, where applicable, the following:

Copies of the applicable form of warrant agreement and warrant may be obtained from us upon request, and the statements made within this prospectus relating to the warrant agreement and warrant to be issued pursuant to the warrant agreement are summaries of certain anticipated provisions, and do not purport to be complete and are subject to, and qualified in their entirety by reference to, all of the provisions of the applicable warrant agreement and related warrants.

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DESCRIPTION OF DEPOSITARY SHARES

We may, at our option, elect to offer fractional or multiple shares of preferred stock, rather than single shares of preferred stock. In the event we exercise this option, we may issue depository receipts evidencing depositary shares, each of which will represent a fraction or multiple of, to be described in an applicable prospectus supplement, of a share of a particular series of preferred stock. The preferred stock represented by depositary shares will be deposited under a deposit agreement between us and a bank or trust company selected by us. Subject to the terms of the deposit agreement, each owner of a depositary share will, in general, be entitled, in proportion to the applicable fraction or multiple of a share of preferred stock represented by the depositary share, to all of the rights and preferences of the preferred stock or other equity stock represented thereby, including any dividend, voting, redemption, conversion or liquidation rights. For a description of our common stock and preferred stock, see the descriptions in this prospectus under the heading “Description of Capital Stock.” As used in this “Description of Depositary Shares,” references to the “Company,” “we,” “our” or “us” refer solely to Kilroy Realty Corporation and not to any of its subsidiaries, unless otherwise expressly stated or the context otherwise requires.

The depositary shares will be evidenced by depositary receipts issued pursuant to the deposit agreement. The particular terms of the depositary shares offered by the applicable prospectus supplement will be described in the prospectus supplement, which may also include a discussion of certain U.S. federal income tax consequences.

Copies of the applicable form of deposit agreement and depositary receipt may be obtained from us upon request, and the statements made within this prospectus relating to the deposit agreement and the depositary receipt to be issued pursuant to the deposit agreement are summaries of certain anticipated provisions, and do not purport to be complete and are subject to, and qualified in their entirety by reference to, all of the provisions of the applicable deposit agreement and related depositary receipts.

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DESCRIPTION OF MATERIAL PROVISIONS OF THE PARTNERSHIP AGREEMENT OF KILROY REALTY, L.P.

The following is a summary of certain terms and provisions of the Seventh Amended and Restated Agreement of Limited Partnership of the operating partnership, which we refer to, together with any subsequent amendments, supplements or restatements thereof, as the “partnership agreement.” The following description does not purport to be complete and is subject to, and qualified in its entirety by reference to, the provisions of the partnership agreement. For more detail, you should refer to the partnership agreement itself, which is incorporated by reference to our SEC filings. See “Where You Can Find More Information.”

Management of the Partnership

The operating partnership is a Delaware limited partnership. The Company is the sole general partner of the operating partnership and conducts substantially all of its business through the operating partnership.

As the sole general partner of the operating partnership, the Company exercises exclusive and complete discretion in the day-to-day management and control of the operating partnership. Subject to certain exceptions set forth in the partnership agreement, the Company can cause the operating partnership to enter into certain major transactions including acquisitions, dispositions and refinancings and cause changes in its line of business, capital structure and distribution policies. Limited partners may not transact business for, or participate in the management activities or decisions of, the operating partnership, except as provided in the partnership agreement and as required by applicable law.

The operating partnership has both preferred limited partnership interests and common limited partnership interests. As of September 23, 2016, the operating partnership had issued and outstanding 4,000,000 6.875% Series G Cumulative Redeemable Preferred Units, or the Series G preferred units, 4,000,000 6.375% Series H Cumulative Redeemable Preferred Units, or the Series H preferred units, all of which were held by the Company, and 2,631,276 common units. In this discussion, We refer collectively to the Series G preferred units, the Series H preferred units and any other preferred units the operating partnership may issue in the future as preferred units, and to the preferred units and the common units as the units.

Indemnification of the Company’s Officers and Directors

To the extent permitted by applicable law, the partnership agreement provides indemnity to the Company, as general partner, and its officers, directors, employees, agents and any other persons the Company may designate. Similarly, the partnership agreement limits the Company’s liability, as well as that of its officers, directors, employees and agents, to the operating partnership.

Transferability of Partnership Interests

Generally, the Company may not voluntarily withdraw from or transfer or assign its interest in the operating partnership without the consent of the holders of at least 60% of the common units including the Company’s interest. The limited partners may, without the consent of the general partner, transfer, assign, sell, encumber or otherwise dispose of their units in the operating partnership to family members, affiliates (as defined under federal securities laws) and charitable organizations and as collateral in connection with certain lending transactions, and, with the consent of the general partner, may also transfer, assign or sell their units to accredited investors. In each case, the transferee must agree to assume the transferor’s obligations under the partnership agreement. This transfer is also subject to the Company’s right of first refusal to purchase the limited partner’s units for our benefit.

In addition, without the Company’s consent, limited partners may not transfer their units:

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The Company may not engage in any “termination transaction” without the approval of at least 60% of the common units in the operating partnership, including the Company’s general partnership interest in the operating partnership. Termination transactions consist of:

In connection with a termination transaction, all common limited partners must either receive, or have the right to elect to receive, for each common unit an amount of cash, securities or other property equal to the product of:

If, in connection with a termination transaction, a purchase, tender or exchange offer is made to holders of Company common stock, and the common stockholders accept the purchase, tender or exchange offer, each holder of common units must either receive, or must have the right to elect to receive, the greatest amount of cash, securities or other property which that holder would have received if immediately prior to the purchase, tender or exchange offer it had exercised its right to redeem common units, received shares of Company common stock in exchange for its common units, and accepted the purchase, tender or exchange offer.

The Company also may merge or otherwise combine its assets with another entity with the approval of at least 60% of the common units if:

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The board of directors of the Company, in the Company’s capacity as general partner, will reasonably determine relative fair market values and rights, preferences and privileges of the limited partners as of the time of the termination transaction. These values may not be less favorable to the limited partners than the relative values reflected in the terms of the termination transaction.

The Company must use commercially reasonable efforts to structure termination transactions to avoid causing the common limited partners to recognize gain for federal income tax purposes by virtue of the occurrence of or their participation in the termination transaction. In addition, the operating partnership must use commercially reasonable efforts to cooperate with the common limited partners to minimize any taxes payable in connection with any repayment, refinancing, replacement or restructuring of indebtedness, or any sale, exchange or other disposition of its assets.

Issuance of Additional Units Representing Partnership Interests

As sole general partner of the operating partnership, the Company has the ability to cause the operating partnership to issue additional units representing general and limited partnership interests. These units may include units representing preferred limited partnership interests, subject to the approval rights of holders of the Series G preferred units with respect to the issuance of preferred units ranking senior to the Series G preferred units and holders of the Series H preferred units with respect to the issuance of preferred units ranking senior to the Series H preferred units.

Capital Contributions by the Company to the Operating Partnership

The Company may borrow additional funds in excess of the funds available from borrowings or capital contributions from a financial institution or other lender or through public or private debt offerings. The Company may then lend these funds to the operating partnership on the same terms and conditions that applied to the Company. In some cases, the Company may instead contribute these funds as an additional capital contribution to the operating partnership and increase its interest in the operating partnership and decrease the interests of the limited partners.

The Effect of Awards Granted Under Our Stock Incentive Plans

The Company may issue shares of common stock (including restricted Company common stock) to employees and other service providers of the operating partnership and/or its subsidiaries Kilroy Services, LLC or Kilroy Realty TRS, Inc., which we refer to collectively as the services companies, as applicable, in respect of

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services provided to such entity, pursuant to awards granted under the Company’s 1997 Stock Option and Incentive Plan, as amended, the Company’s 2006 Incentive Award Plan, as amended, or any other equity incentive award plan maintained by the Company from time to time.

Issuances of any such shares of Company common stock are treated as follows: (i) upon the issuance of the shares (or, with respect to restricted Company common stock, upon the vesting of such shares) a number of operating partnership units equal to the number of shares of Company common stock issued (or vested), are transferred by the operating partnership to the Company; (ii) any amounts paid by an employee or other service provider of the operating partnership or services companies, as applicable, to the Company to purchase such shares of Company common stock are transferred by the Company to the operating partnership or services companies, as applicable; and (iii) shares of Company common stock received by the employee or other service provider of the operating partnership or services companies, as applicable, are treated as compensation paid by the operating partnership or the services companies, as applicable, to the employee or other service provider (to the extent that the value of such shares at the time of transfer or subsequent vesting exceeds the amount paid for them).

Any distributions made to employees or other service providers of the operating partnership or services companies by the Company in respect of unvested shares of Company common stock are reimbursed to the Company by the operating partnership or services companies, as applicable, and are treated as compensation paid directly by the operating partnership or the services companies, as applicable. Unvested shares of Company common stock that are forfeited prior to vesting are returned to the Company by the employee or other service provider. In addition, any amounts paid for such shares are returned by the operating partnership or services companies, as applicable, to the Company. To the extent that an employee or other service provider provides services to more than one of the Company, the operating partnership, the services companies or any subsidiary, the Company may, in its discretion, allocate the payment or issuance of shares among such entities.

The foregoing description assumes that no employee or other service provider of the Company, the operating partnership or the services companies has made (or will make) an election under Section 83(b) of the Code.

Tax Matters that Affect the Operating Partnership

The Company has the authority under the partnership agreement to make tax elections under the Code on the operating partnership’s behalf.

Allocations of Net Income and Net Losses to Partners

The net income of the operating partnership will generally be allocated:

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Net losses of the operating partnership will generally be allocated:

Notwithstanding the foregoing, the partnership agreement generally provides that the operating partnership’s adjusted net income (as defined in the partnership agreement) will first be allocated to the holders of the operating partnership’s Series G preferred units and the Series H preferred units and any other preferred units that the operating partnership may issue in the future to the extent of their preferred returns, with the remaining items of net income or net loss allocated according to the provisions described above. The allocations described above are subject to compliance with the provisions of Sections 704(b) and 704(c) of the Code and the associated Treasury regulations.

Operations and Management of the Operating Partnership

The operating partnership must be operated in a manner that will enable the Company to maintain its qualification as a REIT and avoid any federal income tax liability. The partnership agreement provides that the Company will determine from time to time, but not less frequently than quarterly, the net operating cash revenues of the operating partnership, as well as net sales and refinancing proceeds, pro rata in accordance with the partners respective percentage interests, subject to the distribution preferences with respect to the Series G preferred units and the Series H preferred units and any other preferred units that the operating partnership may issue in the future. The partnership agreement further provides that the operating partnership will assume and pay when due, or reimburse the Company for payment of, all expenses that the Company incurs relating to the ownership and operation of, or for the benefit of, the operating partnership and all costs and expenses relating to the Company’s operations.

Term of the Partnership Agreement

The operating partnership will continue in full force and effect until December 31, 2095, or until sooner dissolved in accordance with the terms of the partnership agreement.

6.875% Series G Cumulative Redeemable Preferred Units

Distributions

Each Series G preferred unit is entitled to receive cumulative preferential distributions payable on or before the 15th day of February, May, August and November of each year at a rate of 6.875% per annum of the $25.00 stated value of a Series G preferred unit (equivalent to $1.71875 per annum). The cumulative preferential distributions will be paid in preference to any payment made on any other class or series of partnership interest of the operating partnership, other than the Series H preferred units and any other class or series of partnership interest expressly designated as ranking on parity with or senior to the Series G preferred units.

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Ranking

The Series G preferred units rank:

Redemption

The Series G preferred units will not be redeemable before March 27, 2017, except under circumstances intended to preserve the Company’s status as a REIT for federal and/or state income tax purposes or upon the occurrence of a Series G Change of Control (as defined above under “Description of Capital Stock—6.875% Series G Cumulative Redeemable Preferred Stock”). On and after March 27, 2017, the Series G preferred units may be redeemed at a redemption price, payable in cash, equal to the sum of $25.00 plus any accumulated and unpaid distributions to the date of redemption per Series G preferred unit. In addition, upon the occurrence of a Series G Change of Control, the Series G preferred units may be redeemed at a redemption price equal to the sum of $25.00 plus accumulated and unpaid distributions to the date of redemption per Series G preferred unit.

Conversion Rights

The Series G preferred units may be exchanged for common units upon a Series G Change of Control, all on the terms and subject to the conditions and exceptions described in the partnership agreement.

Liquidation Preference

The distribution and income allocation provisions of the partnership agreement have the effect of providing each Series G preferred unit with a liquidation preference equal to $25.00 per unit, plus any accumulated but unpaid distributions, in preference to any other class or series of partnership interest other than those interests expressly designated as ranking on a parity with or senior to the Series G preferred units.

6.375% Series H Cumulative Redeemable Preferred Units

Distributions

Each Series H preferred unit is entitled to receive cumulative preferential distributions payable on the 15th day of February, May, August and November of each year at a rate of 6.375% per annum of the $25.00 stated value of a Series H preferred unit (equivalent to $1.59375 per annum). The cumulative preferential distributions will be paid in preference to any payment made on any other class or series of partnership interest of the operating partnership, other than the Series G preferred units and any other class or series of partnership interest expressly designated as ranking on parity with or senior to the Series H preferred units.

Ranking

The Series H preferred units rank:

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Redemption

The Series H preferred units will not be redeemable before August 15, 2017, except under circumstances intended to preserve the Company’s status as a real estate investment trust for federal and/or state income tax purposes or upon the occurrence of a Series H Change of Control (as defined above under “Description of Capital Stock—6.375% Series H Cumulative Redeemable Preferred Stock”). On and after August 15, 2017, the Series H preferred units may be redeemed at a redemption price payable in cash, equal to the sum of $25.00 plus any accumulated and unpaid distributions to the date of redemption per Series H preferred unit. In addition, upon the occurrence of a Series H Change of Control, the Series H preferred units may be redeemed at a redemption price equal to the sum of $25.00 plus accumulated and unpaid distributions to the date of redemption per Series H preferred unit.

Conversion Rights

The Series H preferred units may be exchanged for common units upon a Series H Change of Control, all on the terms and subject to the conditions and exceptions described in the partnership agreement.

Liquidation Preference

The distribution and income allocation provisions of the partnership agreement have the effect of providing each Series H preferred unit with a liquidation preference equal to $25.00 per unit, plus any accumulated but unpaid distributions, in preference to any other class or series of partnership interest other than those interests expressly designated as ranking on a parity with or senior to the Series H preferred units.

Common Limited Partnership Units

General

The partnership agreement provides that, subject to the distribution preferences of the Series G preferred units and the Series H preferred units and any other preferred units that may be issued in the future, common units are entitled to receive quarterly distributions of available cash on a pro rata basis in accordance with their respective percentage interests. As of September 23, 2016, 2,631,276 issued and outstanding common units were held by our common limited partners other than the Company.

Redemption/Exchange Rights

Common limited partners have the right to require the operating partnership to redeem part or all of their common units for cash based upon the fair market value of an equivalent number of shares of Company common stock at the time of the redemption. Alternatively, the Company may elect to acquire those units tendered for redemption in exchange for shares of Company common stock. The Company’s acquisition will be on a one-for-one basis, subject to adjustment in the event of stock splits, stock dividends, issuance of some rights, some extraordinary distributions and similar events. However, even if the Company elects not to acquire tendered units in exchange for shares of common stock, holders of common units that are corporations or limited liability companies may require that the Company issue common stock in exchange for their common units, subject to applicable ownership limits or any other limit as provided in the Company’s charter or as otherwise determined by the board of directors, as applicable. The Company presently anticipates that the Company will elect to issue

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shares of common stock in exchange for common units in connection with each redemption request, rather than having the operating partnership redeem the common units for cash. With each redemption or exchange, the Company increases its percentage ownership interest in the operating partnership. Common limited partners may exercise this redemption right from time to time, in whole or in part, except when, as a consequence of shares of common stock being issued, any person’s actual or constructive stock ownership would exceed the ownership limits, or any other limit as provided in the Company’s charter or as otherwise determined by the board of directors.

Common Limited Partner Approval Rights

The partnership agreement provides that if the limited partners own at least 5% of the common units representing common partnership interests in the operating partnership, including those common units held by the Company as general partner, the Company will not, on behalf of the operating partnership and without the prior consent of the holders of more than 50% of the common units representing limited partnership interests in the operating partnership, dissolve the operating partnership, unless the dissolution or sale is incident to a merger or a sale of substantially all of the Company’s assets.

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CERTAIN PROVISIONS OF MARYLAND LAW AND OF THE COMPANY’S CHARTER AND BYLAWS

The following is a description of certain provisions of Maryland law and the Company’s charter and bylaws. This description is not complete and is subject to, and qualified in its entirety by reference to, Maryland law and the Company’s charter and bylaws. You should read the Company’s charter and bylaws, which are incorporated by reference to our SEC filings. See “Where You Can Find More Information.”

The Board of Directors

The Company’s charter provides that the number of the directors shall be established by its bylaws, but cannot be less than the minimum number required by the Maryland General Corporation Law, or MGCL, which is one. The Company’s bylaws allow the board of directors to fix or change the number to not fewer than three and not more than 13 members. The number of directors is currently fixed at six. A majority of the remaining board of directors may fill any vacancy, other than a vacancy caused by removal. A majority of the board of directors may fill a vacancy resulting from an increase in the number of directors. The stockholders entitled to vote for the election of directors at an annual or special meeting of the Company’s stockholders may fill a vacancy resulting from the removal of a director.

The Company’s charter and bylaws provide that a majority of the board of directors must be “independent directors.” An “independent director” is a director who is not:

No Cumulative Voting

Holders of shares of Company common stock have no right to cumulative voting for the election of directors. Consequently, at each annual meeting of the Company’s stockholders, the holders of a majority of the shares of Company common stock entitled to vote will be able to elect all of the successors of the directors at that meeting.

Removal of Directors

The Company’s charter provides that its stockholders may remove a director only for “cause” and only by the affirmative vote of at least two-thirds of the shares entitled to vote in the election of directors. The MGCL does not define the term “cause.” As a result, removal for “cause” is subject to Maryland common law and to judicial interpretation and review in the context of the unique facts and circumstances of any particular situation.

Election of Directors

The Company’s bylaws provide a majority vote standard for uncontested elections of directors. As a result, except in the case of directors to be elected by the holders of any class or series of the Company’s preferred stock, at each meeting of stockholders at which the election of directors is uncontested, a director nominee will be elected to the board of directors only if the number of votes cast “FOR” the nominee exceeds the number of votes cast “AGAINST” the nominee (with abstentions and broker non-votes not counted as a vote cast either “FOR” or “AGAINST” the director nominee). A plurality vote standard applies in contested elections, in which case stockholders will not be permitted to vote “AGAINST” any director nominee but will only be permitted to vote “FOR” or withhold their vote with respect to such nominee. An election will be considered to be contested if

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the Company’s secretary has received notice that a stockholder or group of stockholders has nominated or proposes to nominate one or more persons for election as a director and, at least 14 days prior to the date on which notice of the meeting is first mailed to stockholders, the nomination has not been withdrawn and would thereby cause the number of director nominees to exceed the number of directors to be elected at the meeting.

Under the MGCL, if an incumbent director is not re-elected at a meeting of stockholders at which he or she stands for re-election in an uncontested election, then the incumbent director continues to serve in office as a holdover director until his or her successor is elected and qualifies. However, the Company’s bylaws provide that if an incumbent director is not re-elected due to his or her failure to receive a majority of the votes cast in an uncontested election, the director will promptly tender his or her resignation as a director, subject to acceptance by the board of directors. The nominating and corporate governance committee of the board of directors will then make a recommendation to the board of directors as to whether to accept or reject the tendered resignation or whether other action should be taken. The board of directors will publicly disclose within 90 days of certification of the stockholder vote its decision and rationale regarding whether to accept, reject or take other action with respect to the tendered resignation. If a director’s tendered resignation is not accepted by the board of directors, such director would continue to serve until the next annual meeting of stockholders and until his or her successor is elected and qualified or his or her earlier death, retirement, resignation or removal. If a director’s tendered resignation is accepted, then the board of directors may, among other things, fill the resulting vacancy or decrease the size of the board of directors.

The Company is not Subject to the Maryland Business Combination Statute

The Company has elected not to be subject to the “business combination” provisions of the MGCL (sections 3-601 through 3-604) and it cannot rescind such election and become subject to these business combination provisions without the approval of holders of a majority of its shares entitled to vote.

In the event that the Company decides to be subject to the business combinations provision, “business combinations” between a Maryland corporation and an interested stockholder or an affiliate of an interested stockholder are generally prohibited for five years after the most recent date on which the interested stockholder becomes an interested stockholder. A business combination includes a merger, consolidation or share exchange. A business combination may also include an asset transfer or issuance or reclassification of equity securities. An interested stockholder is defined in the MGCL as:

A person is not an interested stockholder under the business combinations provisions of the MGCL if the board of directors approved in advance the transaction by which such person would otherwise have become an interested stockholder.

At the conclusion of the five-year prohibition, any business combination between the Maryland corporation and an interested stockholder generally must be recommended by the board of directors of the corporation and approved by the affirmative vote of at least:

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These super-majority vote requirements do not apply if the corporation’s common stockholders receive a minimum price, as defined under Maryland law, for their shares in the form of cash or other consideration in the same form as previously paid by the interested stockholder for its shares. None of these provisions of Maryland law will apply, however, to business combinations that are approved or exempted by the board of directors of the corporation prior to the time that the interested stockholder becomes an interested stockholder.

As a result of the Company’s decision not to be subject to the business combinations statute, an interested stockholder would be able to effect a “business combination” without complying with the requirements discussed above, which may make it easier for stockholders who become interested stockholders to consummate a business combination involving the Company. However, the Company cannot assure you that any business combinations will be consummated or, if consummated, will result in a purchase of shares of capital stock from its stockholders at a premium.

The Company is not Subject to the Maryland Control Share Acquisition Statute

The Company has elected in its bylaws not to be subject to the “control share acquisition” provisions of the MGCL (sections 3-701 through 3-710). If it wants to be subject to these provisions, its bylaws would need to be amended. Such amendments would require the approval of the holders of a majority of the shares entitled to vote.

Maryland law provides that “control shares” of a company acquired in a “control share acquisition” have no voting rights except to the extent approved by a vote of two-thirds of the votes entitled to vote, excluding shares owned by the acquiror or by officers or directors who are employees of the Company. “Control shares” are voting shares of stock which, if aggregated with all other voting shares of stock previously acquired by the acquiror, or over which the acquiror is able to directly or indirectly exercise voting power, except solely by revocable proxy, would entitle the acquiror to exercise voting power in electing directors within one of the following ranges of voting power:

“Control shares” do not include shares of stock the acquiring person is entitled to vote having obtained prior stockholder approval. Generally, “control share acquisition” means the acquisition of control shares.

A person who has made or proposes to make a control share acquisition may compel the board of directors to call a special meeting of stockholders to consider voting rights for the shares. The meeting must be held within 50 days of demand. If no request for a meeting is made, the Company may present the question at any stockholders’ meeting.

If voting rights are not approved at the meeting or if the acquiring person does not deliver an acquiring person statement as required by the statute, then, subject to conditions and limitations, the corporation may redeem any or all of the control shares, except those for which voting rights previously have been approved, for fair value. Fair value is determined without regard to the absence of voting rights for control shares, as of the date of the last control share acquisition or of any meeting of stockholders at which the voting rights of control shares are considered and not approved. If voting rights for control shares are approved at a stockholders meeting and the acquiror becomes entitled to vote a majority of the shares entitled to vote, all other stockholders may exercise appraisal rights. The fair value of the shares as determined for purposes of these appraisal rights may not be less than the highest price per share paid in the control share acquisition. Limitations and restrictions otherwise applicable to the exercise of dissenters’ rights do not apply in the context of a control share acquisition.

The control share acquisition statute does not apply to shares acquired in a merger, consolidation or share exchange if the company is a party to the transaction, or to acquisitions approved or exempted by its charter or

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bylaws. Because the Company is not subject to these provisions, stockholders who acquire a substantial block of Company common stock do not need approval of the other stockholders before exercising full voting rights with respect to their shares on all matters. This may make it easier for any of these control share stockholders to effect a business combination with the Company. However, the Company cannot assure you that any business combinations will be consummated or, if consummated, will result in a purchase of shares of Company common stock from any stockholder at a premium.

Unsolicited Takeovers

Under certain provisions of the MGCL relating to unsolicited takeovers, a Maryland corporation with a class of equity securities registered under the Exchange Act and at least three independent directors may elect to be subject to certain statutory provisions relating to unsolicited takeovers which, among other things, would automatically classify the board of directors into three classes with staggered terms of three years each and vest in its board of directors the exclusive right to determine the number of directors and the exclusive right, by the affirmative vote of a majority of the remaining directors, to fill vacancies on the board of directors, even if the remaining directors do not constitute a quorum. These statutory provisions also provide that any director elected to fill a vacancy shall hold office for the remainder of the full term of the class of directors in which the vacancy occurred, rather than the next annual meeting of directors as would otherwise be the case, and until his successor is elected and qualified.

An election to be subject to any or all of the foregoing statutory provisions may be made in the Company’s charter or bylaws, or by resolution of the board of directors. Any such statutory provision to which the Company elects to be subject will apply even if other provisions of Maryland law or the Company’s charter or bylaws provide to the contrary.

If the Company made an election to be subject to the statutory provisions described above, the board of directors would automatically be classified into three classes with staggered terms of office of three years each, and would have the exclusive right to determine the number of directors and the exclusive right to fill vacancies on the board of directors. Moreover, any director elected to fill a vacancy would hold office for the remainder of the full term of the class of directors in which the vacancy occurred.

In such instance, the classification and staggered terms of office of the directors would make it more difficult for a third party to gain control of the board of directors since at least two annual meetings of stockholders, instead of one, generally would be required to effect a change in the majority of the board of directors.

The Company has not elected to become subject to the foregoing statutory provisions relating to unsolicited takeovers. However, the Company could by resolutions adopted by the board of directors and without stockholder approval, elect to become subject to some or all of these statutory provisions.

Amendment of the Company’s Charter and Bylaws

The Company’s charter may generally be amended only if the amendment is declared advisable by the board of directors and approved by its stockholders by the affirmative vote of at least two-thirds of the shares entitled to vote on the amendment. The Company’s bylaws generally may be amended by the affirmative vote of a majority of the board of directors or of a majority of the Company’s shares entitled to vote. However, the following bylaw provisions may be amended only by the approval of a majority of the Company’s shares of capital stock entitled to vote:

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Meetings of Stockholders

The Company’s bylaws provide for annual meetings of its stockholders to elect directors and to transact other business properly brought before the meeting. In addition, a special meeting of stockholders may be called by: