FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * KROPP JAMES H   2. Issuer Name and Ticker or Trading Symbol PS BUSINESS PARKS INC/CA [PSB] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O PS BUSINESS PARKS, INC., 701 WESTERN AVENUE 3. Date of Earliest Transaction (Month/Day/Year) 05/09/2018 (Street) GLENDALE, CA 91201 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 05/09/2018   M   2,068 (1) A $ 42.4 11,202 D   Common Stock 05/09/2018   S   1,768 D $ 117.9136 9,434 D   Common Stock               4,491 I by IRA (2)

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Stock Option (right to buy) (3)

$ 42.4 (4)

05/09/2018

M

2,068 (4)

05/04/2010

05/04/2019

Common Stock (4)

2,068 (4)

$ 0

0

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
KROPP JAMES H C/O PS BUSINESS PARKS, INC. 701 WESTERN AVENUE GLENDALE, CA 91201	X

Signatures

/s/ Lily Yan Hughes, Attorney-in-Fact		05/10/2018
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	On December 15, 2014, PSB declared a special dividend, payable on December 30, 2014. As a result, pursuant to anti dilution provisions of PSB's 2003 Stock Option and Incentive Plan, an option for 2,000 shares of common stock held by the reporting person on December 30, 2014 became exercisable for an additional 68 shares of common stock.
(2)	By a custodian of an IRA for benefit of the reporting person.
(3)	Stock Option granted pursuant to the 2003 Stock Option and Incentive Plan. The Option vested in five (5) equal annual installments beginning one (1) year from date of grant.
(4)	This option was previously reported as an option for 2,000 shares of common stock at an exercise price of $43.84, but was adjusted to reflect the special dividend declared by PSB on December 15, 2014.

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