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FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person*
KROPP JAMES H
(Last)(First)(Middle)
C/O PS BUSINESS PARKS, INC., 701 WESTERN AVENUE
(Street)
GLENDALECA91201-2397
(City)(State)(Zip)
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)
XDirector10% Owner
Officer (give title below)Other (specify below)
3. Date of Earliest Transaction (Month/Day/Year)
05/07/2009
4. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person

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)
CodeVAmount(A) or (D)Price
Common Stock         4,491 I by IRA (1)
Common Stock 05/07/2009 M  1,000 A$ 24.6875 6,000 D  
Common Stock 05/07/2009 S  266 D$ 39.344 5,734 D  
Common Stock 05/07/2009 S  200 D$ 39.372 5,534 D  
Common Stock 05/07/2009 S  200 D$ 39.382 5,334 D  
Depositary Shares Representing Series I Preferred Stock         1,000 I by IRA (1)
Depositary Shares Representing Series L Preferred Stock         1,000 I by IRA (1)
Depositary Shares Representing Series P Preferred Stock         1,000 I by IRA (1)

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 Security3. 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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Stock Option (right to buy) (2) $ 43.84       05/04/201005/04/2019 Common Stock 2,000   2,000 D  
Stock Option (right to buy) (2) $ 57.79       05/05/200905/05/2018 Common Stock 2,000   2,000 D  
Stock Option (right to buy) (2) $ 68.9       04/30/200804/30/2017 Common Stock 2,000   2,000 D  
Stock Option (right to buy) (2) $ 51.25       05/01/200705/01/2016 Common Stock 2,000   2,000 D  
Stock Option (right to buy) (2) $ 39.95       05/03/200605/03/2015 Common Stock 2,000   2,000 D  
Stock Option (right to buy) (2) $ 39.26       05/04/200505/04/2014 Common Stock 2,000   2,000 D  
Stock Option (right to buy) (2) $ 32.48       05/06/200405/06/2013 Common Stock 2,000   2,000 D  
Stock Option (right to buy) (3) $ 35.43       05/14/200305/14/2012 Common Stock 1,000   1,000 D  
Stock Option (right to buy) (3) $ 26.4       05/08/200205/08/2011 Common Stock 1,000   1,000 D  
Stock Option (right to buy) (3) $ 23.75       05/09/200105/09/2010 Common Stock 1,000   1,000 D  
Stock Option (right to buy) (3) $ 24.6875 05/07/2009 M   1,000 05/10/200005/10/2009 Common Stock 1,000 $ 0 0 D  
Explanation of Responses:
1. By a custodian of an IRA for benefit of the reporting person.
2. Stock Options granted pursuant to the 2003 Stock Option and Incentive Plan; options vest in 5 equal annual installments beginning 1 year from date of grant.
3. Stock Options granted pursuant to the 1997 Stock Option and Incentive Plan; options vest in 3 equal annual installments beginning 1 year from date of grant.
/s/ Stephanie G. Heim, Attorney in Fact05/07/2009
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

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