SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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

                                 SCHEDULE 13D/A

    INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULE 13d-1(a)
             AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(a)

                                (Amendment No. 7)

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

                             PS BUSINESS PARKS, INC.
                                (Name of Issuer)

                          COMMON STOCK $0.01 PAR VALUE
                         (Title of Class of Securities)


                                   69360J 10 7
                                 (CUSIP Number)

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

                                STEPHANIE G. HEIM
                               701 WESTERN AVENUE
                         GLENDALE, CALIFORNIA 91201-2397
                                 (818) 244-8080
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

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

                                 AUGUST 14, 2009
             (Date of Event Which Requires Filing of This Statement)

If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box. [ ]

Note:  Schedules  filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See Rule 13d-7 for other parties
to whom copies are to be sent.

*   The  remainder  of this  cover  page  shall be  filled  out for a  reporting
    person's  initial  filing on this form with respect to the subject  class of
    securities,  and for any subsequent amendment  containing  information which
    would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).




1. NAMES OF REPORTING PERSONS
         I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

         Public Storage

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



2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a)
(b)

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

3. SEC USE ONLY

--------------------------------------------------------------------------------
4. SOURCE OF FUNDS

         WC
--------------------------------------------------------------------------------

5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
         ITEMS 2(d) OR 2(e)

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

6. CITIZENSHIP OR PLACE OF ORGANIZATION

         Maryland
------------------- ------ -----------------------------------------------------
    Number of              7.  SOLE VOTING POWER
      Shares                    5,801,606(1)
                           -----------------------------------------------------
   Beneficially            8.  SHARED VOTING POWER
     Owned By                   0
                           -----------------------------------------------------
       Each                9.  SOLE DISPOSITIVE POWER
    Reporting                   5,801,606(1)
                           -----------------------------------------------------
   Person With             10.  SHARED DISPOSITIVE POWER
                                0
------------------- ------ -----------------------------------------------------
11.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         5,801,606(1)
--------------------------------------------------------------------------------

12.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
--------------------------------------------------------------------------------

13.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 23.8%(2)
--------------------------------------------------------------------------------

14.      TYPE OF REPORTING PERSON REPORTING
         CO
--------------------------------------------------------------------------------

(1) Includes shares previously  reported as held by PS Texas Holdings,  Ltd. and
    PS GPT Properties,  Inc.,  wholly-owned  subsidiaries of Public Storage that
    were dissolved and all shares held distributed to Public Storage.

(2) Percentage of class based on number of shares outstanding at August 14, 2009
    of 24,380,925.




         This  Amendment No. 7 to Statement on Schedule 13D amends the Statement
on Schedule  13D dated  November  16,  1995,  as amended  (the  "Schedule  13D")
previously filed by Public Storage, Inc., as predecessor to Public Storage.

ITEM 1.  SECURITY AND ISSUER

         This  Amendment  No. 7 to the Schedule 13D relates to the Common Stock,
par value $.01 per share (the "Shares") of PS Business Parks, Inc., a California
corporation formerly known as Public Storage Properties XI, Inc. (the "Issuer").

         The  address  of the  principal  executive  office of the Issuer is 701
Western Avenue, Glendale, California 92101-2397.

ITEM 2.  IDENTITY AND BACKGROUND

         This  Amendment  No. 7 to the  Schedule  13D is being  filed by  Public
Storage,  as  successor  by merger  to Public  Storage,  Inc.  Unless  otherwise
indicated,  all  capitalized  terms used herein shall have the meanings given to
them in the  Schedule  13D,  and unless  amended  or  supplemented  hereby,  all
information previously filed remains in effect.

         Public  Storage is a Maryland  real  estate  investment  trust and is a
fully  integrated,  self-advised and self-managed  real estate  investment trust
which  is  engaged  primarily  in the  development,  construction,  acquisition,
ownership, operation, management and leasing of mini-warehouses.  Effective June
1, 2007,  Public Storage,  Inc.  merged into Public Storage.  As a result of the
merger,  Public Storage owns all the Shares  previously owned by Public Storage,
Inc.  In  addition,  Shares  previously  reported  as owned by two  wholly-owned
subsidiaries  of  Public  Storage,  Inc.,  PS Texas  Holdings,  Ltd.  and PS GPT
Properties,  Inc.,  totaling  266,706 Shares were  transferred to Public Storage
when those entities were dissolved.

         The  address  of Public  Storage's  principal  executive  office is 701
Western Avenue, Glendale, California 91201-2397.

         Information  regarding the identity and  background  of Public  Storage
trustees  and  executive  officers  is set forth in  Appendix A attached to this
Statement  on  Schedule  13D. To the  knowledge  of Public  Storage,  all of its
trustees and executive  officers are citizens of the Unites States except Uri P.
Harkham,  who is a citizen of Australia  and John T. Evans,  who is a citizen of
Canada.

         During the last five years,  neither the  Reporting  Person nor, to its
knowledge,  any  trustee,  executive  officer,  or  controlling  person  of  the
Reporting Person, has been convicted in a criminal proceeding (excluding traffic
violations or similar misdemeanors) or has been a party to a civil proceeding of
a judicial or administrative  body of competent  jurisdiction and as a result of
such proceeding was or is subject to a judgment, decree or final order enjoining
future violations of, or prohibiting or mandating activities subject to, federal
or state securities laws or finding any violation with respect to such laws.



ITEM 3.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION

         Public Storage paid a total of $17,824,985 to acquire  383,333  Shares.
All of the funds for the  acquisition  of the Shares came from Public  Storage's
available  cash-on-hand.  The Shares were  acquired from the Issuer in a private
transaction  pursuant to a Share Purchase  Agreement  dated August 14, 2009. The
price per Share paid by Public  Storage of $46.50 was set at the offering  price
of Shares sold by the Issuer in a concurrent public offering of Shares.

ITEM 4.  PURPOSE OF TRANSACTION

         The purpose of the acquisition was to partially offset the effects of a
concurrent  public  offering of 3,450,000  Shares by the Issuer.  The  Reporting
Person currently intends to hold its Shares for investment. The Reporting Person
may, at some future time,  depending on the Issuer's business  prospects,  other
developments  concerning the Issuer,  market and economic conditions,  and other
factors,  acquire  additional  Shares or other securities of the Issuer (through
one or more market purchases or purchases in private transactions) or dispose of
all or a portion of the Shares which the Reporting  Person now owns or hereafter
may acquire.

ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER

         As of August 14,  2009,  the  Reporting  Person owned (or was deemed to
own) a total of 5,801,606 Shares. Such Shares constitute approximately 23.8%, in
the aggregate,  of the total number of Shares  outstanding on August 14, 2009 of
24,380,925.  The  Reporting  Person has sole voting  power and sole  dispositive
power with  respect to all of the Shares it owns.  Public  Storage  undertook no
other transactions in Shares during the post sixty days.

         The number of Shares  beneficially  owned by each of the  trustees  and
executive officers of Public Storage is set forth on Appendix A attached to this
Statement  on  Schedule  13D.  Unless  otherwise  indicated,  each  trustee  and
executive  officer  has the sole  power to vote and the sole power to dispose of
his or her Shares.

ITEM 6.  CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT
         TO SECURITIES OF THE ISSUER

         Public  Storage  also  holds  7,305,355  units of  limited  partnership
interest  in the  Operating  Partnership  ("Units"),  including  units  held  by
partnerships of which Public Storage is a general partner. Pursuant to the terms
of the  Operating  Partnership's  Agreement  of Limited  Partnership,  Units are
redeemable for cash, or at the election of the Issuer,  for Shares of the Issuer
on a one-for-one basis.

         Except as disclosed  herein,  to the knowledge of the Reporting Person,
there are no contracts,  arrangements,  understandings or relationships  between



the  Reporting  Person and any person  with  respect  to any  securities  of the
Issuer, including but not limited to transfer or voting of any of the securities
of the Issuer, finder's fees, joint ventures, loan or option arrangements,  puts
or calls,  guarantees  of profits,  division of profits or loss or the giving or
withholding of proxies, or a pledge or contingency the occurrence of which would
give another person voting power over securities of the Issuer.

ITEM 7.  MATERIAL TO BE FILED AS EXHIBITS

         N/A


                                    SIGNATURE

         After  reasonable  inquiry and to the bet of my knowledge and belief, I
certify that the information  set forth in this statement is true,  complete and
correct.

Dated:  August 28, 2009                     PUBLIC STORAGE


                                            By:  /s/ Stephanie G. Heim
                                                 ---------------------
                                                 Stephanie G. Heim
                                                 Vice President









                                   Appendix A

                                                                                  No. of Shares
                                                                                  Beneficially
Name                           Title                                              Owned
----                           -----                                              --------------

                                                                                  
B. Wayne Hughes                Chairman of the Board                                    114,355

Ronald L. Havner, Jr.          Vice Chairman, Chief Executive Officer
                               and President                                            202,984*

Dann V. Angeloff               Trustee                                                       -0-

William C. Baker               Trustee                                                       -0-

John T. Evans                  Trustee                                                       -0-

Tamara Hughes Gustavson        Trustee                                                       -0-

Uri P. Harkham                 Trustee                                                       -0-

B. Wayne Hughes, Jr.           Trustee                                                    2,500

Harvey Lenkin                  Trustee                                                   16,416*

Gary E. Pruitt                 Trustee                                                       -0-

Daniel C. Staton               Trustee                                                       -0-

Mark Good                      Chief Operating Officer                                       -0-

Candace Krol                   Senior Vice President, Human Resources                        -0-

John Reyes                     Senior Vice President and                                     -0-
                               Chief Financial Officer



*   Includes  Shares  which  represent  vested  portion of Shares  subject to an
    option under the Issuer's employee and director stock option plans.