PS Business Parks (PSBXP) 10-K 2006 FY Annual report

Exhibit 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in the Registration Statement on Form S-8 (No. 333-48313) of PS Business Parks, Inc. pertaining to the PS Business Parks, Inc. 1997 Stock Option and Incentive Plan, the Registration Statement on Form S-8 (No. 333-50274) of PS Business Parks, Inc. pertaining to the PS 401(k) Profit Sharing Plan, the Registration Statement on Form S-8 (No. 333-104604) of PS Business Parks, Inc. pertaining to the PS Business Parks, Inc. 2003 Stock Option and Incentive Plan, the Registration Statement on Form S-8 (No. 333-129463) of PS Business Parks, Inc. pertaining to the PS Business Parks, Inc. Retirement Plan for Non-Employee Directors, the Registration Statement on Form S-3 (No. 333-78627) and in the related prospectus, the Registration Statement on Form S-3 (No. 333-50463) and in the related prospectus, and the Registration Statement on Form S-3 (No. 333-112969) and the related prospectus of our reports dated February 23, 2007 with respect to the consolidated financial statements and related financial statement schedule of PS Business Parks, Inc., PS Business Parks, Inc. management’s assessment of the effectiveness of internal control over financial reporting, and the effectiveness of internal control over financial reporting of PS Business Parks, Inc., included in this Annual Report on Form 10-K for the year ended December 31, 2006.

     /s/ Ernst & Young LLP

Los Angeles, California
February 23, 2007