PS BUSINESS PARKS, INC. EXHIBIT 12: STATEMENT RE: COMPUTATION OF RATION OF EARNINGS TO FIXED CHARGES Nine Months Ended September 30, ---------------------------------------- 2000 1999 -------------------- ----------------- Net income...................................................... $ 33,726,000 $ 30,352,000 Minority interest............................................... 18,391,000 10,769,000 Interest expense................................................ 1,246,000 2,658,000 -------------------- ----------------- Earnings available to cover fixed charges....................... $ 53,363,000 $ 43,779,000 ==================== ================= Fixed charges (1)............................................... $ 2,242,000 $ 3,242,000 Preferred distributions......................................... 12,814,000 3,370,000 -------------------- ----------------- Combined fixed charges and preferred distributions.............. $ 15,056,000 $ 6,612,000 ==================== ================= Ratio of earnings to fixed charges.............................. 23.8 13.50 ==================== ================= Ratio of earnings to combined fixed charges and preferred distributions.................................................. 3.54 6.62 ==================== ================= Years Ended December 31, --------------------------------------------------------------------------------- 1999 1998 1997 1996 1995 ---------------- --------------- ---------------- --------------- --------------- Net income.......................... $ 41,255,000 $ 29,400,000 $ 3,836,000 $ 519,000 $ 1,192,000 Minority interest................... 16,049,000 11,208,000 8,566,000 - - Interest expense.................... 3,153,000 2,361,000 1,000 - - ---------------- --------------- ---------------- --------------- --------------- Earnings available to cover fixed charges.......................... $60,457,000 $ 42,969,000 $ 12,403,000 $ 519,000 $ 1,192,000 ================ =============== ================ =============== =============== Fixed charges (1)................... $ 4,142,000 $ 2,629,000 $ 1,000 $ - $ - Preferred distributions............. 7,562,000 - - - - ---------------- --------------- ---------------- --------------- --------------- Combined fixed charges and preferred distributions.................... $ 11,704,000 $ 2,629,000 $ 1,000 $ - $ - ================ =============== ================ =============== =============== Ratio of earnings to fixed charges.. 14.60 16.34 12,403 N/A N/A ================ =============== ================ =============== =============== Ratio of earnings to combined fixed charges and preferred distributions.................... 5.17 16.34 12,403 N/A N/A ================ =============== ================ =============== =============== (1) Fixed charges include interest expense plus capitalized interest. Exhibit 12