SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

                                   FORM 8-K/A


                 Current Report Pursuant to Section 13 or 15(d)
                     of The Securities Exchange Act of 1934

       Date of Report (Date of earliest event reported) December 27, 2001


                             PS BUSINESS PARKS, INC.
                             -----------------------
             (Exact name of registrant as specified in its charter)


      CALIFORNIA                       1-10709                 95-4300881
      ----------                       -------                 ----------
(State or Other Jurisdiction   (Commission File Number)     (I.R.S. Employer
    of Incorporation)                                     Identification Number)


               701 Western Avenue, Glendale, California 91201-2379
               ---------------------------------------------------
               (Address of principal executive offices) (Zip Code)


       Registrant's telephone number, including area code: (818) 244-8080
                                                           --------------


                                       N/A
                                       ---
          (Former name or former address, if changed since last report)




ITEM 5.  Other Events

PS Business Parks,  Inc.,  through its  consolidated  partnership  (collectively
referred  to as the  "Company"),  acquired  a  business  park  consisting  of 17
buildings  known as "Metro  Park North" on  December  27,  2001 at an  aggregate
purchase  price of  approximately  $127.3 million  (including  closing costs and
deferred  maintenance).  The park was acquired  through the  acquisition of five
limited  liability  companies  controlled  by one  seller.  The  Company  is not
affiliated with the seller and the purchase price was established  through arm's
length negotiations. The acquisition was funded with the Company's existing cash
balances, borrowings of $40 million from its unsecured line of credit with Wells
Fargo Bank and borrowings from an affiliate of $35 million.

The following  table  provides  certain  information  concerning  the facilities
acquired:




         Name and                                       Date of                   Allocation of    Net Rentable    Occupancy
         Location                    Seller           Acquisition  Property Type  Purchase Price  Square Footage   at Closing
-------------------------   ------------------------ ------------- ------------- --------------- ---------------- ------------
                                                                                                
Metro Park I
  Rockville, Maryland        MP Investments I, LLC     12/27/01     Flex/Office    $ 41,939,000       340,424         100%


Metro Park II
  Rockville, Maryland        MP Investments II, LLC    12/27/01      Flex/Office     13,532,000       109,473         100%

Metro Park III
  Rockville, Maryland        MP Investments III, LLC   12/27/01        Office        17,594,000       116,753          62%
                             LLC

Metro Park IV
  Rockville, Maryland        MP Investments IV, LLC    12/27/01        Office        16,223,000       113,912         100%

Metro Park V
  Rockville, Maryland        MP Investments V, LLC     12/27/01        Office        38,027,000       224,725          97%
                                                                                 --------------- ---------------- ------------
                                                                                   $127,315,000       905,287          95%
                                                                                 =============== ================ ============


                                       1



Item 7. Financial Statements and Exhibits

(a)(3)  Financial Statements Specified by Rule 3.14 of Regulation S-X
        -------------------------------------------------------------

         Metro Park North

         o    Report of Independent Auditors

         o    Combined  Statements  of Certain  Revenues  and Certain  Operating
              Expenses for the six months ended  September 30, 2001  (unaudited)
              and for the year ended March 31, 2001

         o    Notes  to  Combined  Statements  of  Certain  Revenues and Certain
              Operating Expenses

         An audited statement is being presented for the most recent fiscal year
         available instead of the three most recent years based on the following
         factors:  (i) Metro Park North was acquired from a single  unaffiliated
         party and (ii)  based on the  investigation  of Metro Park North by the
         Company,  management is not aware of any material  factors  relating to
         Metro Park North that would cause this financial  information not to be
         necessarily  indicative  of future  operating  results  other  than the
         factors specifically considered by the Company as described below.

         In the decision to acquire Metro Park North, the Company considered the
         competition from other commercial  property owners,  the location,  the
         leases, the rental rates and the occupancy levels.

         The Company has reviewed  the  expenses of Metro Park North,  including
         salaries of on-site  personnel,  utilities,  property taxes,  supplies,
         insurance and repairs and maintenance. The Company expects that certain
         operating expenses in the future will be consistent with those reported
         the six months  ended  September  30, 2001 and for the year ended March
         31, 2001.

(b)      Pro Forma Consolidated Finanical Statements
         -------------------------------------------

(c)      Exhibits
         --------

         23.  Consent of Independent Auditors

                                       2


                                   SIGNATURES


Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
Registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.


                                                         PS BUSINESS PARKS, INC.


Date:  January 16, 2002                                    By: /S/ JACK CORRIGAN
                                                               -----------------
                                                                   Jack Corrigan
                                      Vice President and Chief Financial Officer


                                       3



                        REPORT OF INDEPENDENT ACCOUNTANTS

To the Board of Directors
of PS Business Parks, Inc.


We have audited the  accompanying  combined  statement  of certain  revenues and
certain operating expenses of the operating  properties that comprise Metro Park
North, described in Note 1 (the "Statement"), for the year ended March 31, 2001.
The  Statement  is the  responsibility  of Metro Park  North's  management.  Our
responsibility is to express an opinion on the Statement based on our audit.

We conducted our audit in accordance with auditing standards  generally accepted
in the  United  States of  America.  Those  standards  require  that we plan and
perform the audit to obtain reasonable  assurance about whether the Statement is
free of material  misstatement.  An audit includes  examining,  on a test basis,
evidence supporting the amounts and disclosures in the Statement.  An audit also
includes assessing the accounting principles used and significant estimates made
by management,  as well as evaluating the overall presentation of the Statement.
We believe that our audit provides a reasonable basis for our opinion.

The  accompanying  Statement was prepared for the purpose of complying  with the
rules and regulations of the Securities and Exchange Commission, as described in
Note 1, and is not intended to be a complete  presentation of Metro Park North's
revenues and expenses.

In our opinion, the Statement referred to above presents fairly, in all material
respects, the combined certain revenues and certain operating expenses described
in Note 1 of Metro Park North for the year ended  March 31,  2001 in  conformity
with accounting principles generally accepted in the United States of America.




PricewaterhouseCoopers LLP
San Francisco, California
January 4, 2002

                                       4



                               METRO PARK NORTH
      Combined Statements of Certain Revenus and Certain Operating Expenses


                                            Six months ended        Year ended
                                           September 30, 2001     March 31, 2001
                                          -------------------- -----------------
                                                         (Unaudited)
Certain rental revenues................    $    8,121,000        $  15,646,000
Certain operating expenses.............        (2,868,000)          (5,690,000)
                                          -------------------- -----------------
Certain rental  revenues in  excess  of
    certain operating expenses.........    $    5,253,000        $   9,956,000
                                          ==================== =================



                             See accompanying notes
                                       5


                               METRO PARK NORTH
 Notes to Combined Statements of Certain Revenues and Certain Operating Expenses


1.       Background and Basis for Presentation

         The  accompanying  combined  statements of certain revenues and certain
         operating  expenses  include the accounts of the  operating  properties
         that comprise Metro Park North,  located in Maryland and acquired by PS
         Business   Parks,   Inc.,   through   its   consolidated    partnership
         (collectively  referred to as the  "Company")  on December 27, 2001 for
         approximately $127 million.  The statements have been prepared in order
         to comply with Rule 3-14 of Regulation S-X,  "Special  instructions for
         real estate  operations to be acquired" and are prepared on the accrual
         basis of accounting.

         The following table summarizes the properties acquired:

            Name and Location              Seller              Property Type
        --------------------------- ------------------------- ---------------
         Metro Park I
           Rockville, Maryland        MP Investments I, LLC    Flex/Office

         Metro Park II
           Rockville, Maryland        MP Investments II,        Flex/Office
                                      LLC
         Metro Park III
           Rockville, Maryland        MP Investments III,         Office
                                      LLC
         Metro Park IV
           Rockville, Maryland        MP Investments IV,          Office
                                      LLC
         Metro Park V
           Rockville, Maryland        MP Investments V, LLC       Office

         The  combined  statements  of certain  revenues  and certain  operating
         expenses  include  only the accounts and  activities  of the  operating
         properties  that  comprise  Metro  Park  North.   Items  that  are  not
         comparable  to the  future  operations  of Metro  Park  North have been
         excluded.  Such items include  depreciation,  amortization,  management
         fees,   interest   expense,   interest   income,   professional   fees,
         miscellaneous income and straight line rent adjustments.

2.       Summary of Significant Accounting Policies

         Revenue Recognition

         Metro Park North leases space to tenants for which they charge  minimum
         rents and receive  reimbursement  for certain operating  expenses.  The
         leases are  accounted  for as operating  leases and are  non-cancelable
         with varying terms and expiration  dates.  Recoveries  from tenants are
         recognized as income in the period the applicable costs are accrued.

         Certain Operating Expenses

         Certain operating expenses include costs paid or incurred by the owners
         for maintaining, operating and repairing the operating properties. This
         includes utilities, repairs and maintenance and real estate taxes.

                                       6



                                METRO PARK NORTH
 Notes to Combined Statements of Certain Revenues and Certain Operating Expenses


         Use of Estimates

         The  preparation  of the  statements  of certain  revenues  and certain
         operating expenses in conformity with accounting  principles  generally
         accepted in the United  States of America  requires  management to make
         estimates  and  assumptions  that  affect the  amounts  reported in the
         statements  of certain  revenues  and certain  operating  expenses  and
         accompanying notes. Actual results could differ from those estimates.

         Interim Statements

         The interim  financial data for the six months ended September 30, 2001
         is unaudited; however, in the opinion of the management of the Company,
         the interim data includes all  adjustments,  consisting  only of normal
         recurring  adjustments,  necessary for a fair  statement of the results
         for the interim  period.  The results for the period  presented are not
         necessarily indicative of the results for the full year.


                                       7


ITEM 7 (b)  PRO FORMA CONSOLIDATED FINANCIAL STATEMENTS (Unaudited)

The  following  unaudited  pro  forma  consolidated  financial  statements  were
prepared to reflect the  acquisition  of real estate  facilities  by PS Business
Parks, Inc., through its consolidated  partnership  (collectively referred to as
the "Company").

The Company  acquired a business park consisting of 17 buildings known as "Metro
Park North" on December 27, 2001 at an aggregate purchase price of approximately
$127.3 million (including closing costs and deferred  maintenance).  The Company
is not  affiliated  with the  sellers  and the  purchase  price was  established
through arm's length negotiations. The acquisition was funded with the Company's
existing cash  balances,  borrowings  of $40 million from its unsecured  line of
credit with Wells Fargo Bank and borrowings from an affiliate of $35 million.

The Company acquired 12 buildings known as the "Prosperity  Business Campus" and
12 buildings (including 24 acres of developable land) known as the "Cornell Oaks
Corporate  Center" on June 1, 2001 and November 20,  2001,  respectively,  at an
aggregate  purchase price of  approximately  $175.9 million.  The Company is not
affiliated with the sellers and the purchase price was established through arm's
length  negotiations.  The acquisitions were funded with the Company's  existing
cash balances,  proceeds from preferred  offerings (see below) and borrowings of
$60 million from its unsecured line of credit with Wells Fargo Bank.

In addition to  adjustments  to reflect the recently  acquired  properties,  pro
forma adjustments were made to reflect the following transactions:

        1.    On May 10, 2001 and June 18, 2001,  the Company  issued  1,840,000
              and 800,000  depositary  shares,  respectively,  each representing
              1/1,000 of a share of the  Company's 9 1/2%  Cumulative  Preferred
              Stock,   Series  D  at  $25.00  per  share.   Net  proceeds   were
              approximately  $64.3 million and were used for  investment in real
              estate.

        2.    On September 21, 2001, the Company  completed a private  placement
              of 2,120,000 preferred units with a preferred distribution rate of
              9 1/4%.  Net proceeds  were  approximately  $51.6 million and were
              used for investment in real estate.


                                       8



The pro forma consolidated balance sheet at September 30, 2001 has been prepared
to reflect the subsequent acquisitions of commercial properties.

The pro forma  consolidated  statements  of  income  for the nine  months  ended
September  30,  2001 and the year ended  December  31,  2000 have been  prepared
assuming (i) the aforementioned  acquisitions of commercial  properties and (ii)
the aforementioned public offerings of depositary shares representing fractional
interest in preferred stock and the private  placement of preferred units, as if
all  such  transactions  were  consummated  at  the  beginning  of  the  periods
presented.  The operations of all property  acquisitions are based on historical
operating results.

As a result of the different  existing  fiscal  year-ends of December 31 for the
Company and March 31 for Metro Park North,  the  unaudited  pro forma  condensed
combined  statement of income for the year ended  December 31, 2000 includes the
actual  operations  of the Company for the year ended  December 31, 2000 and the
actual  operations  of Metro Park North for the year ended  March 31,  2001.  As
such, the operating results of Metro Park North for the three months ended March
31, 2001 are  included in the  unaudited  pro forma  condensed  combined  income
statements  for the year ended  December  31,  2000 and also for the nine months
ended September 30, 2001.

The pro forma adjustments are based upon available  information and upon certain
assumptions  as set forth in the notes to the pro forma  consolidated  financial
statements that the Company believes is reasonable in the circumstances. The pro
forma consolidated financial statements and accompanying notes should be read in
conjunction  with the historical  financial  statements of the Company and other
documents filed with the Securities and Exchange  Commission (such as Form 8-K's
which  reference  property  acquisitions)  from time to time.  The following pro
forma  consolidated  financial  statements do not purport to represent  what the
Company's results of operations would actually have been if the transactions had
in fact  occurred  at the  beginning  of the dates  indicated  or to project the
Company's results of operations for any future date or period.


                                       9




                             PS BUSINESS PARKS, INC.
                      PRO FORMA CONSOLIDATED BALANCE SHEET
                               September 30, 2001
                                   (Unaudited)
                  (Amounts in thousands, except per share data)



                                                                                       Property
                                                                                     Acquisitions
                                                                  Historical           (Note 1)           Pro Forma
                           ASSETS                            ------------------- ------------------- ---------------------
                           ------
                                                                                            
Cash and cash equivalents.................................     $         66,291   $        (66,291)   $              -
Marketable securities.....................................                8,657                  -               8,657
Real estate, net of accumulated depreciation..............              941,998            214,815           1,156,813
Receivables and other assets..............................               11,559                  -              11,559
                                                             ------------------- ------------------- ---------------------
     Total assets.........................................     $      1,028,505   $        148,524    $      1,177,029
                                                             =================== =================== =====================

            LIABILITIES AND SHAREHOLDERS' EQUITY
            ------------------------------------

Accrued and other liabilities.............................     $         35,202   $              -    $         35,202
Line of credit............................................                    -            100,000             100,000
Mortgage notes payable....................................               30,354                  -              30,354
Notes payable to affiliate................................                    -             48,524              48,524

Minority interests:
   Preferred units........................................              197,750                  -             197,750
   Common units...........................................              162,338                  -             162,338

Shareholders' equity:
   Preferred stock,  $0.01 par value,   50,000,000  shares
      authorized, 4,840 shares issued and  outstanding  at
      September 30, 2001..................................              121,000                  -             121,000
   Common  stock,  $0.01 par  value,  100,000,000   shares
      authorized, 21,704,067 shares issued and outstanding
      at September 30, 2001...............................                  217                  -                 217
   Paid-in capital........................................              426,546                  -             426,546
   Cumulative net income..................................              162,134                  -             162,134
   Other comprehensive loss...............................                 (740)                 -                (740)
   Cumulative distributions...............................             (106,296)                 -            (106,296)
                                                             ------------------- ------------------- ---------------------
       Total shareholders' equity.........................              602,861                  -             602,861
                                                             ------------------- ------------------- ---------------------
   Total liabilities and shareholders' equity.............     $      1,028,505   $        148,524    $      1,177,029
                                                             =================== =================== =====================

Book value per common share (Note 2)......................     $         22.20                        $         22.20
                                                             =================== =================== =====================
Shares outstanding........................................              21,704                                 21,704
                                                             =================== =================== =====================


        See Accompanying Notes to Pro Forma Consolidated Balance Sheet.
                                       10


                             PS BUSINESS PARKS, INC.
                  NOTES TO PRO FORMA CONSOLIDATED BALANCE SHEET
                               September 30, 2001
                                   (Unaudited)


1.       Property Acquisitions
         ---------------------

         On November 20, 2001,  the Company  acquired 12 buildings  known as the
         Cornell Oaks Corporate  Center from an  unaffiliated  third party at an
         aggregate cost of  approximately  $87.5 million.  On December 27, 2001,
         the  Company  acquired 17  buildings  known as Metro Park North from an
         unaffiliated  third party at an aggregate cost of approximately  $127.3
         million.

         The  following  pro forma  adjustments  have been made to the pro forma
         consolidated balance sheet to reflect the aforementioned transaction as
         if these  properties  had been owned by the Company as of September 30,
         2001.

        o Pro forma  adjustments  have been made to cash and cash equivalents to
          reflect:




                                                                                                
        o        The acquisition cost of Cornell Oaks Corporate Center.........................     $  (87,500,000)
        o        The acquisition cost of Metro Park North......................................       (127,315,000)
        o        Borrowings from the line of credit to fund the acquisition....................        100,000,000
        o        Borrowings from an affiliate to fund the acquisition..........................         48,524,000
                                                                                                   ------------------
                                                                                                    $  (66,291,000)
                                                                                                   ==================
        o    A  pro forma  adjustment  has  been made to real estate  facilities to reflect the
             acquisition cost of the facilities acquired.......................................     $  214,815,000
                                                                                                   ==================
        o    A  pro  forma  adjustment  has  been  made to reflect borrowings  from the line of
             credit to fund the acquisition....................................................     $  100,000,000
                                                                                                   ==================
        o    A  pro forma  adjustment  has  been  made to reflect borrowings  from an affiliate
             to fund the acquisition...........................................................     $   48,524,000
                                                                                                   ==================

2.       Book value per common share
         ---------------------------

         Book value per  common  share has been  determined  by  dividing  total
         common  shareholders'  equity by the  outstanding  common  shares.  The
         following summarizes the common shares outstanding:

                                                                                                     Common shares
                                                                                                      outstanding
                                                                                                   -------------------
        o        Historical shares outstanding at September 30, 2001...........................         21,704,000





     See Accompanying Notes to Pro Forma Consolidated Statements of Income.
                                       11



                             PS BUSINESS PARKS, INC.
                   PRO FORMA CONSOLIDATED STATEMENT OF INCOME
                  For the Nine Months Ended September 30, 2001
                                   (Unaudited)
                  (Amounts in thousands, except per share data)




                                                                                  Property          Other
                                                                                Acquisitions     Adjustments
                                                               Historical         (Note 1)         (Note 2)         Pro Forma
                                                             ---------------- ----------------- ---------------- ---------------
                                                                                                     
               REVENUES:
                  Rental income............................   $    121,964     $     25,270      $          -     $    147,234
                 Facility management fees primarily from
                    affiliates.............................            499                -                 -              499
                  Business services........................            308                -                 -              308
                  Interest income                                    1,659                -            (1,280)             379
                  Dividend income..........................             12                -                 -               12
                                                             ---------------- ----------------- ---------------- ---------------
                                                                   124,442           25,270            (1,280)         148,432
                                                             ---------------- ----------------- ---------------- ---------------
               EXPENSES:
                  Cost of operations.......................         32,852            7,805                 -           40,657
                  Cost of facility management..............            111                -                 -              111
                  Cost of business services................            460                -                 -              460
                  Depreciation and amortization............         30,058            4,765                 -           34,823
                  General and administrative...............          3,157                -                 -            3,157
                  Interest expense.........................            932                -             3,461            4,393
                                                             ---------------- ----------------- ---------------- ---------------
                                                                    67,570           12,570             3,461           83,601
                                                             ---------------- ----------------- ---------------- ---------------
               Income  (loss)  before  gain on real estate
               investments and minority interest in income.         56,872           12,700            (4,741)          64,831
                  Gain on investment in Pacific Gulf
                  Properties, Inc..........................             15                -                 -               15
                                                             ---------------- ----------------- ---------------- ---------------
               Income  (loss) before  minority interest in
               income......................................         56,887           12,700            (4,741)          64,846
                  Minority interest in income - preferred
                  units...................................          (9,696)               -            (3,541)         (13,237)
                  Minority interest in income - common
                  units (Note 4)...........................        (10,047)          (3,099)            2,632          (10,514)
                                                             ---------------- ----------------- ---------------- ---------------
               Net income (loss)...........................   $     37,144     $      9,601      $     (5,650)    $      41,095
                                                             ================ ================= ================ ===============

               Net income (loss) allocation:
                  Allocable to preferred shareholders......   $      6,014     $          -      $      2,504     $      8,518
                  Allocable to common shareholders.........         31,130            9,601            (8,154)          32,577
                                                             ---------------- ----------------- ---------------- ---------------
                                                              $     37,144     $      9,601      $     (5,650)    $     41,095
                                                             ================ ================= ================ ===============
               Net income per common share (Note 3):
                    Basic..................................   $      1.38                                         $        1.44
                                                             ================                                    ===============
                    Diluted................................   $      1.37                                         $        1.44
                                                             ================                                    ===============

               Weighted average common shares outstanding
                (Note 3):
                    Basic..................................        22,610                                                22,610
                                                             ================                                    ===============
                    Diluted................................        22,685                                                22,685
                                                             ================                                    ===============



     See Accompanying Notes to Pro Forma Consolidated Statements of Income.
                                       12



                             PS BUSINESS PARKS, INC.
                   PRO FORMA CONSOLIDATED STATEMENT OF INCOME
                  For the Nine Months Ended September 30, 2001
                                   (Unaudited)
                  (Amounts in thousands, except per share data)




                                                                                  Property          Other
                                                                                Acquisitions     Adjustments
                                                               Historical         (Note 1)         (Note 2)         Pro Forma
                                                             ---------------- ----------------- ---------------- ---------------
                                                                                                     
               REVENUES:
                  Rental income............................   $    144,171     $     36,712      $          -     $    180,883
                 Facility management fees primarily from
                    affiliates.............................            581                -                 -              581
                  Business services........................            505                -                 -              505
                  Interest income..........................          4,076                -            (2,520)           1,556
                  Dividend income..........................          1,301                -                 -            1,301
                                                             ---------------- ----------------- ---------------- ---------------
                                                                   150,634           36,712            (2,520)         184,826
                                                             ---------------- ----------------- ---------------- ---------------
               EXPENSES:
                  Cost of operations.......................         39,290           11,285                 -           50,575
                  Cost of facility management..............            111                -                 -              111
                  Cost of business services................            344                -                 -              344
                  Depreciation and amortization............         35,637            7,358                 -           42,995
                  General and administrative...............          3,954                -                 -            3,954
                  Interest expense.........................          1,481                -             4,615            6,096
                                                             ---------------- ----------------- ---------------- ---------------
                                                                    80,817           18,643             4,615          104,075
                                                             ---------------- ----------------- ---------------- ---------------
               Income  (loss)  before  gain on real  estate
               investments and minority interest in income.         69,817           18,069            (7,135)          80,751
                  Gain on disposition of real estate.......            256                -                 -              256
                  Gain on investment in Pacific Gulf
                  Properties, Inc..........................          7,849                -                 -            7,849
                                                             ---------------- ----------------- ---------------- ---------------
               Income  (loss) before  minority  interest in
               income......................................         77,922           18,069            (7,135)          88,856
                  Minority interest in income - preferred
                  units....................................        (12,185)               -            (4,903)         (17,088)
                  Minority interest in income - common
                  units (Note 4)...........................        (14,556)          (4,337)            4,394          (14,499)
                                                             ---------------- ----------------- ---------------- ---------------
               Net income (loss)...........................   $     51,181     $     13,732      $     (7,644)    $     57,269
                                                             ================ ================= ================ ===============

               Net income allocation:
                  Allocable to preferred shareholders......   $      5,088     $          -      $      6,270     $     11,358
                  Allocable to common shareholders.........         46,093           13,732           (13,914)          45,911
                                                             ---------------- ----------------- ---------------- ---------------
                                                              $     51,181     $     13,732      $     (7,644)    $     57,269
                                                             ================ ================= ================ ===============
               Net income per common share (Note 3):
                    Basic..................................   $      1.98                                         $        1.97
                                                             ================                                    ===============
                    Diluted................................   $      1.97                                         $        1.96
                                                             ================                                    ===============

               Weighted average common shares outstanding
                 (Note 3):
                    Basic..................................        23,284                                               23,284
                                                             ================                                    ===============
                    Diluted................................        23,365                                               23,365
                                                             ================                                    ===============



     See Accompanying Notes to Pro Forma Consolidated Statements of Income.
                                       13



                             PS BUSINESS PARKS, INC.
              NOTES TO PRO FORMA CONSOLIDATED STATEMENTS OF INCOME
                  For the nine months ended September 30, 2001
                      and the year ended December 31, 2000
                                   (Unaudited)


1.       Property Acquisitions
         ---------------------

         The  following  pro forma  adjustments  have been made to  reflect  the
         operations of the newly acquired  properties as if such  properties had
         been owned and operated by the Company  throughout  the entire  periods
         presented:





                                                                              Nine months ended       Year ended
                                                                              September 30, 2001   December 31, 2000
                                                                           ---------------------- -------------------
                                                                                     (Amounts in thousands)
                                                                                            
        o   Rental income has been adjusted to reflect:
             o    the pro  forma   rental   income  as  if  the   acquired
                  properties were owned  by the  Company  for the  periods
                  presented:
                     Prosperity Business Campus...........................    $        9,731        $       11,572
                     Cornell Oaks Corporate Center........................             7,625                 9,494
                     Metro Park North.....................................            12,287                15,646
             o    the rental income of these  properties which are already
                  included in the Company's historical amounts............            (4,373)                    -
                                                                           ---------------------- -------------------
                                                                              $       25,270        $       36,712
                                                                           ====================== ===================
        o   Cost of operations has been adjusted to reflect:
             o   the pro  forma  cost  of  operations  as if the  acquired
                 properties  were  owned by the  Company  for the  periods
                 presented:
                     Prosperity Business Campus...........................    $        2,625        $        3,254
                     Cornell Oaks Corporate Center........................             1,758                 2,341
                     Metro Park North.....................................             4,503                 5,690
             o   the cost of  operations  of these  properties  which  are
                 already included in the Company's historical amounts.....            (1,081)                    -
                                                                           ---------------------- -------------------
                                                                              $        7,805        $       11,285
                                                                           ====================== ===================

        o    A  pro  forma   adjustment  has  been  made  to  reflect  the
             incremental depreciation expense of the  acquired  properties
             as  if  they  were  owned  by  the  Company  for  the periods
             presented....................................................    $        4,765        $        7,358
                                                                           ====================== ===================

        o    Minority    interest    in   income    allocable   to  common
             unitholders  has  been  adjusted  based  upon  its  pro  rata
             ownership interest in the pro forma adjustments above........    $       (3,099)       $       (4,337)
                                                                           ====================== ===================



                                       14



                             PS BUSINESS PARKS, INC.
              NOTES TO PRO FORMA CONSOLIDATED STATEMENTS OF INCOME
                  For the nine months ended September 30, 2001
                      and the year ended December 31, 2000
                                   (Unaudited)


2.       Other Pro Forma Adjustments
         ---------------------------





                                                                              Nine months ended       Year ended
                                                                              September 30, 2001   December 31, 2000
                                                                           ---------------------- -------------------
                                                                                      (Amounts in thousands,
                                                                                      except per share data)
                                                                                            

        o    Interest  income  has  been  adjusted to reduce the interest
             earned on average cash balances that would not have  existed
             had the acquisitions  been  consummated  at the beginning of
             the periods presented.......................................     $        1,280        $        2,520
                                                                           ====================== ===================

        o    Interest  expense has been adjusted to reflect the interest
             expense associated with the line of credit and note payable
             to affiliate as if the borrowings had been completed at the
             beginning of the periods presented..........................     $        3,461        $        4,615
                                                                           ====================== ===================

        o    Minority interest in income - preferred has been adjusted to
             reflect  the  incremental  preferred distributions as if the
             preferred unit offering  had been completed at the beginning
             of the periods presented....................................     $       (3,541)       $       (4,903)
                                                                           ====================== ===================

        o    Net  income  allocable  to  preferred  shareholders has been
             adjusted  to  reflect the incremental preferred dividends as
             if  the  preferred  stock offering had been completed at the
             beginning of the periods presented..........................     $        2,504        $        6,270
                                                                           ====================== ===================

        o    Minority interest  in income allocable to common unitholders
             has been adjusted based upon its pro rata ownership interest
             in the above pro forma adjustments...........................    $        2,632        $        4,394
                                                                           ====================== ===================



                                       15


                             PS BUSINESS PARKS, INC.
              NOTES TO PRO FORMA CONSOLIDATED STATEMENTS OF INCOME
                  For the nine months ended September 30, 2001
                      and the year ended December 31, 2000
                                   (Unaudited)


3.       Net income per common share has been computed as follows:
         ---------------------------------------------------------




                                                                              Nine months ended       Year ended
                                                                              September 30, 2001   December 31, 2000
                                                                           ---------------------- -------------------
                                                                                      (Amounts in thousands,
                                                                                      except per share data)
                                                                                            
        Historical net income allocable to common shareholders...........    $        31,130       $        46,093
                                                                           ====================== ===================

        Historical weighted average common shares - basic................             22,610                23,284
             Dilutive effect of stock options............................                 75                    81
                                                                           ---------------------- -------------------
        Historical weighted average common shares - diluted..............             22,685                23,365
                                                                           ====================== ===================

        Historical net income per common share - basic...................    $         1.38        $         1.98
        Historical net income per common share - diluted.................    $         1.37        $         1.97

---------------------------------------------------------------------------------------------------------------------

        Pro forma net income allocable to common shareholders............    $        32,577       $        45,911
                                                                           ====================== ===================

        Pro forma weighted average common shares - basic.................             22,610                23,284
             Dilutive effect of stock options............................                 75                    81
                                                                           ---------------------- -------------------
        Pro forma weighted average common shares - diluted...............             22,685                23,365
                                                                           ====================== ===================

        Pro forma net income per common share - basic....................    $        1.44         $         1.97
        Pro forma net income per common share - diluted..................    $        1.44         $         1.96



                                       16



                             PS BUSINESS PARKS, INC.
              NOTES TO PRO FORMA CONSOLIDATED STATEMENTS OF INCOME
                  For the nine months ended September 30, 2001
                      and the year ended December 31, 2000
                                   (Unaudited)


4.       Minority Interest
         -----------------

         Minority interest represents  ownership interests of common OP units in
         the  consolidated  Operating  Partnership  which  are not  owned by the
         Company.  The common OP units,  subject to  certain  conditions  of the
         Operating Partnership Agreement,  are convertible into common shares of
         the Company on a one-for-one  basis. The following table summarizes the
         ownership interests:




                                                                              Nine months ended        Year ended
                                                                              September 30, 2001     December 31, 2000
                                                                           ---------------------- ---------------------
                                                                                      (Amounts in thousands,
                                                                                       except per share data)
                                                                                            
        Pro forma weighted average common shares outstanding..............          22,610                23,284
        Pro forma  weighted  average  common  OP  units  owned by minority
          interests.......................................................           7,307                 7,363
                                                                           ---------------------- ---------------------
        Pro forma  weighted  average  common shares  outstanding  assuming
        conversion of common OP units.....................................          29,917                30,647
                                                                          ====================== =====================

        Percentage owned by common shareholders...........................           75.6%                 76.0%
        Percentage owned by common unitholders............................           24.4%                 24.0%
                                                                           ---------------------- ---------------------
             Total ownership interest.....................................          100.0%                100.0%
                                                                           ====================== =====================



                                       17