UNITED STATES SECURITIES AND EXCHANGE COMMISSION , D.C. 20549

______

FORM 8-K

CURRENT REPORT ______

PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): December 29, 2010

PS BUSINESS PARKS, INC. (Exact Name of Registrant as Specified in its Charter)

California 1-10709 95-4300881 (State or Other Jurisdiction of Incorporation) (Commission File Number) (I.R.S. Employer Identification No.)

701 Western Avenue, Glendale, 91201-2349 (Address of Principal Executive Offices) (Zip Code)

(818) 244-8080 (Registrant's telephone number, including area code)

Check the appropriate box below if the Form 8-K is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

o Written communication pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o Pre-commencements communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

(b) By letter dated December 29, 2010, Harvey Lenkin advised the company of his decision to retire from the Board of Directors of PS Business Parks, Inc. effective Monday, January 3, 2011. Mr. Lenkin, age 74, was a member of the Board since 1998.

A copy of the press release PS Business Parks, Inc. issued on January 4, 2011 to announce Mr. Lenkin’s decision to retire from the Board of Directors is being filed with this Current Report on Form 8-K as Exhibit 99.1.

Item 9.01 Financial Statements and Exhibits

(d) Exhibits

The following exhibit is being filed with this Report: Exhibit 99.1—Press Release dated January 4, 2011

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: January 4, 2011

PS BUSINESS PARKS, INC.

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

Exhibit Index

The following exhibit is being filed with this Report: Exhibit 99.1—Press Release dated January 4, 2011 Ex. 99.1

News Release

PS Business Parks, Inc. 701 Western Avenue Glendale, CA 91201-2349 www.psbusinessparks.com

For Release: Immediately Date: January 4, 2011 Contact: Edward A. Stokx (818) 244-8080, Ext. 1649

Harvey Lenkin Retires From PS Business Parks Board of Directors

GLENDALE, California–PS Business Parks, Inc. (NYSE:PSB) announced today that Harvey Lenkin has retired from its Board of Directors effective January 3, 2011. Mr. Lenkin was associated with the Company since its inception in 1990 and served as a founding director since its initial public offering in 1998.

Joseph D. Russell, Jr., President and Chief Executive Officer of PS Business Parks, commented, “Harvey has been a valued board member throughout his tenure, helping guide and strategically set the foundation for PS Business Parks’ success as a public company. Due to Harvey’s outstanding counsel and his deep understanding of the capital markets, PS Business Parks has grown dramatically as a public company which initially had six million square feet and revenues of $90 million. Today, PS Business Parks owns nearly 22 million square feet of assets in eight states, generates annual revenues in excess of $270 million and has a market capitalization of approximately $2.5 billion. PS Business Parks is fortunate to have had Harvey Lenkin as a founding director and we wish to thank him for his many years of service and leadership. He will surely be missed.”

Company Information

PS Business Parks, Inc., a member of the S&P SmallCap 600, is a self-advised and self-managed equity real estate investment trust (“REIT”) that acquires, develops, owns and operates commercial properties, primarily multi-tenant flex, office and industrial space. The Company defines “flex” space as buildings that are configured with a combination of office and warehouse space and can be designed to fit a number of uses (including office, assembly, showroom, laboratory, light manufacturing and warehouse space). As of December 15, 2010, PSB wholly owned 21.8 million rentable square feet, with approximately 4,100 customers located in eight states, concentrated in California (5.8 million sq. ft.), (4.0 million sq. ft.), (3.7 million sq. ft.), (3.4 million sq. ft.), (2.4 million sq. ft.), Oregon (1.3 million sq. ft.), Arizona (0.7 million sq. ft.) and Washington (0.5 million sq. ft.).

Additional information about PS Business Parks, Inc. is available on the Internet. The Company’s website is www.psbusinessparks.com.

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