X0202 0001143313 AMERICAN STOCK EXCHANGE LLC 0000866368 PS BUSINESS PARKS INC/CA 001-10709

701 WESTERN AVE SUITE 200 GLENDALE CA CALIFORNIA 91201

(818) 244-8080 Depositary Shares representing 1/1,000 of a share of 9.5% Series D Cumulative Preferred Stock 17 CFR 240.12d2-2(a)(2) Kerri Ramirez Manager, Corporate Actions and Proxy Rulings Department 2006-05-10