EXHIBIT 12 ERP OPERATING LIMITED PARTNERSHIP Consolidated Historical Earnings to Combined Fixed Charges and Preferred Distributions Ratio HISTORICAL --------------------------------------------------- 3/31/00 3/31/99 12/31/99 --------------------------------------------------- REVENUES Rental income $ 473,547 406,062 $ 1,711,738 Fee income - outside managed 1,298 1,234 4,970 Interest income - investment in mortgage notes 2,762 2,895 12,559 Interest and other income 7,803 5,946 23,851 -------------- ---------- ------------ Total revenues 485,410 416,137 1,753,118 -------------- ---------- ------------ EXPENSES Property and maintenance 113,868 97,047 414,026 Real estate taxes and insurance 48,334 42,048 171,289 Property management 18,914 14,201 61,626 Fee and asset management 1,066 867 3,587 Depreciation 111,886 96,901 408,688 Interest: Expense incurred 95,111 79,197 337,189 Amortization of deferred financing costs 1,341 845 4,084 General and administrative 6,698 5,767 22,296 -------------- ---------- ------------ Total expenses 397,218 336,873 1,422,785 -------------- ---------- ------------ Income before extraordinary items $ 88,192 $ 79,264 $ 330,333 ============== ========== ============ Combined Fixed Charges and Preferred Distributions: Interest and other financing costs $ 95,111 $ 79,197 $ 337,189 Amortization of deferred financing costs 1,341 845 4,084 Preferred distributions 28,388 29,377 113,196 -------------- ---------- ------------ TOTAL COMBINED FIXED CHARGES AND PREFERRED DISTRIBUTIONS $ 124,840 $ 109,419 $ 454,469 ============== ========== ============ EARNINGS BEFORE COMBINED FIXED CHARGES AND PREFERRED DISTRIBUTIONS $ 184,644 $ 159,306 $ 671,606 ============== ========== ============ FUNDS FROM OPERATIONS BEFORE COMBINED FIXED CHARGES AND PREFERRED DISTRIBUTIONS (1)(2)(3) $ 294,725 $ 254,778 $ 1,074,072 ============== ========== ============ RATIO OF EARNINGS BEFORE COMBINED FIXED CHARGES AND PREFERRED DISTRIBUTIONS TO COMBINED FIXED CHARGES AND PREFERRED DISTRIBUTIONS 1.48 1.46 1.48 ============== ========== ============ RATIO OF FUNDS FROM OPERATIONS BEFORE COMBINED FIXED CHARGES AND PREFERRED DISTRIBUTIONS TO COMBINED FIXED CHARGES AND PREFERRED DISTRIBUTIONS 2.36 2.33 2.36 ============== ========== ============ (1) Includes the Company's share of depreciation from Unconsolidated Properties $ 105 $ 276 $ 1,009 ============== ========== ============ (2) Excludes non-real estate depreciation $ (1,567) $ (1,705) $ (7,231) ============== ========== ============ (3) Excludes the minority interests' share of depreciation from Partially Owned Properties $ (343) $ - $ - ============== ========== ============ HISTORICAL ----------------------------------------------------------------- 12/31/98 12/31/97 12/31/96 12/31/95 ----------------------------------------------------------------- (Amounts in thousands) REVENUES Rental income $ 1,293,560 $ 707,733 $ 454,412 $ 373,919 Fee income - outside managed 5,622 5,697 6,749 7,030 Interest income - investment in mortgage notes 18,564 20,366 12,819 4,862 Interest and other income 19,250 13,282 4,405 4,573 -------------- ---------- ------------ --------- Total revenues 1,336,996 747,078 478,385 390,384 -------------- ---------- ------------ --------- EXPENSES Property and maintenance 326,733 176,075 127,172 112,186 Real estate taxes and insurance 126,009 69,520 44,128 37,002 Property management 53,101 26,793 17,512 15,213 Fee and asset management 4,279 3,364 3,837 3,887 Depreciation 301,869 156,644 93,253 72,410 Interest: Expense incurred 246,585 121,324 81,351 78,375 Amortization of deferred financing costs 2,757 2,523 4,242 3,444 General and administrative 20,631 14,821 9,857 8,129 -------------- ---------- ------------ --------- Total expenses 1,081,964 571,064 381,352 330,646 -------------- ---------- ------------ --------- Income before extraordinary items $ 255,032 $ 176,014 $ 97,033 $ 59,738 ============== ========== ============ ========= Combined Fixed Charges and Preferred Distributions: Interest and other financing costs $ 246,585 $ 121,324 $ 81,351 $ 78,375 Amortization of deferred financing costs 2,757 2,523 4,242 3,444 Preferred distributions 92,917 59,012 29,015 10,109 -------------- ---------- ------------ --------- TOTAL COMBINED FIXED CHARGES AND PREFERRED DISTRIBUTIONS $ 342,259 $ 182,859 $ 114,608 $ 91,928 ============== ========== ============ ========= EARNINGS BEFORE COMBINED FIXED CHARGES AND PREFERRED DISTRIBUTIONS $ 504,374 $ 299,861 $ 182,626 $ 141,557 ============== ========== ============ ========= FUNDS FROM OPERATIONS BEFORE COMBINED FIXED CHARGES AND PREFERRED DISTRIBUTIONS (1)(2)(3) $ 801,065 $ 453,387 $ 273,800 $ 212,138 ============== ========== ============ =========== RATIO OF EARNINGS BEFORE COMBINED FIXED CHARGES AND PREFERRED DISTRIBUTIONS TO COMBINED FIXED CHARGES AND PREFERRED DISTRIBUTIONS 1.47 1.64 1.59 1.54 ============== ========== ============ =========== RATIO OF FUNDS FROM OPERATIONS BEFORE COMBINED FIXED CHARGES AND PREFERRED DISTRIBUTIONS TO COMBINED FIXED CHARGES AND PREFERRED DISTRIBUTIONS 2.34 2.48 2.39 2.31 ============== ========== ============ =========== - ------------------------------------------------------------------------------------------------------------------------ (1) Includes the Company's share of depreciation from Unconsolidated Properties $ 183 $ - $ - $ - =============== ========== ============ =========== (2) Excludes non-real estate depreciation $ (5,361) $ (3,118) $ (2,079) $ (1,829) =============== ========== ============ =========== (3) Excludes the minority interests' share of depreciation from Partially Owned Properties $ - $ - $ - $ - =============== ========== ============ ===========