PS Business Parks, Inc. (NYSE:PSB) announced today that it has priced a public offering of 8.0 million depositary shares, each representing 1/1,000 of a share of the Company’s 6.45% Cumulative Preferred Stock, Series S at $25.00 per share. The Company also granted the underwriters an over-allotment option to purchase an additional 1.2 million depositary shares. The offering is expected to result in $200.0 million of gross proceeds (assuming no exercise of the underwriters’ over-allotment option) and is expected to close on or about January 18, 2012. Merrill Lynch, Pierce, Fenner & Smith Incorporated, Morgan Stanley & Co. LLC and Wells Fargo Securities, LLC acted as joint book-running managers of the offering. This announcement shall not constitute an offer to sell or a solicitation of an offer to buy these securities nor shall there be any offer or sale of these securities in any state or jurisdiction in which such an offer, solicitation or sale would be unlawful. The offering will be made only by means of a prospectus and prospectus supplement, copies of which may be obtained by contacting Merrill Lynch, Pierce, Fenner & Smith Incorporated at 1-800-294-1322, Morgan Stanley & Co. LLC at 1-866-718-1649 and Wells Fargo Securities, LLC at 1-800-326-5897. 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 31, 2011, the Company wholly owned 27.2 million rentable square feet with approximately 4,400 customers located in eight states, concentrated in California (11.1 million sq. ft.), Virginia (4.2 million sq. ft.), Florida (3.7 million sq. ft.), Texas (3.3 million sq. ft.), Maryland (2.4 million sq. ft.), Oregon (1.3 million sq. ft.), Arizona (0.7 million sq. ft.) and Washington (0.5 million sq. ft.).