PS BUSINESS PARKS, INC. Exhibit 12: Statement re: Computation of Ratio of Earnings to Fixed Charges Three Months Ended March 31, --------------------------------------- 1999 1998 -------------- -------------- (Amounts in thousands, except ratios) Net income............................................ $ 9,442,000 $ 4,330,000 Minority interest..................................... 2,966,000 2,814,000 Interest expense...................................... 909,000 247,000 -------------- ------------- Earnings available to cover fixed charges............. $ 13,317,000 $ 7,391,000 ============== ============= Fixed charges (1)..................................... $ 1,094,000 $ 247,000 ============== ============= Ratio of earnings to fixed charges.................... 12.17 29.92 ============== ============= Years Ended December 31, ------------------------------------------------------------------------------ 1998 1997 1996 1995 1994 ------------ ------------ ------------ ------------ ------------ Net income......................... $ 29,400,000 $ 3,836,000 $ 519,000 $ 1,192,000 $ 1,245,000 Minority interest.................. 11,208,000 8,566,000 - - - Interest expense................... 2,361,000 1,000 - - - ------------ ------------ ------------ ------------ ------------ Earnings available to cover fixed charges......................... $ 42,969,000 $ 12,403,000 $ 519,000 $ 1,192,000 $ 1,245,000 ============ ============ ============ ============= ============ Fixed charges (1).................. $ 2,629,000 $ 1,000 $ - $ - $ - ============ ============ ============ ============= ============ Ratio of earnings to fixed charges. 16.34 12,403 N/A N/A N/A ============ ============ ============ ============= ============ (1) Fixed charges include interest expense plus capitalized interest. Exhibit 12 PS BUSINESS PARKS, INC. Exhibit 12: Statement re: Computation of Ratio of Earnings to Fixed Charges Supplemental disclosure of Ratio of Funds from Operations ("FFO") to fixed charges: Three Months Ended March 31, 1999 1998 (Amounts in thousands, except ratios) FFO................................................... $ 18,390,000 $9,444,000 Interest expense...................................... 909,000 247,000 -------------- --------------- Adjusted FFO available to cover fixed charges......... $ 19,299,000 $ 9,691,000 ============== =============== Fixed charges (1)..................................... $ 1,094,000 $ 247,000 ============== =============== Ratio of FFO to fixed charges......................... 17.64 39.23 ============== =============== Years Ended December 31, ------------------------------------------------------------------------------ 1998 1997 1996 1995 1994 ------------ ------------ ------------ ------------ ------------ FFO................................ $ 57,430,000 $ 17,597,000 $ 303,000 $ 720,000 $ 757,000 Interest expense................... 2,361,000 1,000 - - - ------------ ------------ ------------ ------------ ------------ Adjusted FFO available to cover fixed charges................... $ 59,791,000 $ 17,598,000 $ 303,000 $ 720,000 $ 757,000 ============ ============ ============ ============ ============ Fixed charges (1).................. $ 2,629,000 $ 1,000 $ - $ - $ - ============ ============ ============ ============ ============ Ratio of FFO to fixed charges...... 22.74 17,598 N/A N/A N/A ============ ============ ============ ============ ============ (1) Fixed charges include interest expense plus capitalized interest. Exhibit 12