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
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Lewis Sara Grootwassink 		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 (MM/DD/YYYY)

11/7/2016
(Street)

GLENDALE, CA 91201
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form 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. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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   11/7/2016     M    4137   (1) A $46.43   (1) 7137   D    
Common Stock   11/7/2016     S    4137   D $106.9291   (2) 3000   D    

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. 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 7. Title and Amount of Securities Underlying Derivative Security
(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) $46.43   (4) 11/7/2016     M         4137   (4)   2/19/2011   2/19/2020   Common Stock   (4) 4137   (4) $0   0   D    

Explanation of Responses:
( 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 4,000 shares of common stock held by the reporting person on December 30, 2014 became exercisable for an additional 137 shares of common stock.
( 2)  Represents weighted average purchase price. These shares were sold at prices ranging from $106.65 to $107.14. Full information regarding the number of shares purchased at each separate price will be provided by the reporting person upon request to the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer.
( 3)  Stock Option granted pursuant to the 2003 Stock Option and Incentive Plan. Option vested in five (5) equal annual installments beginning one (1) year from the date of grant.
( 4)  This option was previously reported as an option for 4,000 shares of common stock at an exercise price of $48.01, but was adjusted to reflect the special dividend declared by PSB on December 15, 2014.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Lewis Sara Grootwassink
C/O PS BUSINESS PARKS, INC.
701 WESTERN AVENUE
GLENDALE, CA 91201 		X



Signatures
/s/ Lily Yan Hughes, Attorney-in-Fact 11/8/2016
** Signature of Reporting Person Date


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 control number.
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