PS Business Parks

                                  701 Western Avenue, Glendale, California 91201


July 14, 2009

VIA EDGAR AND COURIER

Sonia Barros
Special Counsel
Securities and Exchange Commission
100 F Street, NE
Washington, D.C.  20549

Re:      PS Business Parks
         Registration Statement on Form S-3
         Filed June 19, 2009
         File No. 333-160104

Dear Ms. Barros:

         Set forth below is the response of PS Business Parks, Inc. to the Staff
comment provided in your letter dated July 13, 2009,  regarding our Registration
Statement on Form S-3 filed June 19, 2009,  File No.  333-160104.  In connection
with this letter responding to the Staff's comment,  we are filing Amendment No.
1 to the  Registration  Statement  and I have  enclosed a courtesy  copy of such
Amendment No. 1 marked to show changes from the Registration  Statement as filed
on June 19, 2009.

         The  Staff's  comment,  indicated  in bold  below,  is  followed  by PS
Business Parks' response.

1.       WE NOTE THAT YOU HAVE NOT FILED THE  STATEMENT  OF  ELIGIBILITY  OF THE
         TRUSTEE.  PLEASE FILE THIS IN ACCORDANCE WITH THE  REQUIREMENTS OF ITEM
         601(B)(25)  OF  REGULATION  S-K. TO THE EXTENT YOU INTEND TO REPLY UPON
         SECTION  305(B)(2) OF THE TRUST  INDENTURE ACT TO DESIGNATE THE TRUSTEE
         ON A DELAYED  BASIS,  YOU MUST NOTE THIS IN THE  EXHIBIT  LIST.  IF YOU
         INTEND TO  DESIGNATE  THE TRUSTEE ON A DELAYED  BASIS,  PLEASE BE AWARE
         THAT COMPANIES  RELYING ON SECTION  305(B)(2) MUST  SEPARATELY FILE THE
         FORM T-1  UNDER  THE  ELECTRONIC  FORM TYPE  "305B2."  PLEASE  REFER TO
         SECTION  220.01  UNDER  "1939  ACT -  GENERAL  GUIDANCE,"  WHICH CAN BE
         LOCATED AT HTTY://WWW.SEC.GOV/DIVISIONS/CORPFIN/GUIDANCE/TIAINTERP.HTM.
                    ------------------------------------------------------------

         Response:
         ---------

         In  response  to the Staff's  comment,  we revised the exhibit  list to
         indicate that we will file the statement of  eligibility of the trustee
         on a delayed basis.  The revised exhibit index is included in Amendment
         No. 1 to our Form S-3 that was filed today on EDGAR.

         In connection with PS Business Parks' response to the Staff's  comment,
we hereby acknowledge that:




Sonia Barros
Securities and Exchange Commission
July 14,2009
Page2



o        PS Business Parks is  responsible  for the adequacy and accuracy of the
         disclosure in the filings,

o        Staff  comments or changes to disclosure in response to Staff  comments
         do not foreclose the Commission  from taking any action with respect to
         the filings, and

o        PS  Business  Parks may not assert  Staff  comments as a defense in any
         proceeding  initiated by the Commission or any person under the federal
         securities laws of the United States.

Should you need additional  information,  please call me at  818-244-8080,  ext.
1319. My fax number is 818-548-9288 if you need it.

Sincerely,

/s/Stephanie G. Heim

Stephanie G. Heim
Vice President, Corporate Counsel & Assistant Secretary

cc:    Erin Martin, Attorney-Advisor,  Division of Corporate Finance, Securities
       and Exchange Commission