CONSOLIDATED STATEMENTS OF OPERATIONS OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
REVENUES
Rental income	$ 541,569	$ 478,419	$ 1,063,162	$ 939,121
Fee and asset management	2,212	1,948	4,276	3,754
Total revenues	543,781	480,367	1,067,438	942,875
EXPENSES
Property and maintenance	107,024	98,571	218,004	202,157
Real estate taxes and insurance	63,126	54,803	118,768	106,610
Property management	21,008	20,767	44,417	43,148
Fee and asset management	1,180	1,009	2,487	1,957
Depreciation	172,338	154,452	346,079	311,891
General and administrative	13,394	10,908	27,082	22,341
Total expenses	378,070	340,510	756,837	688,104
Operating income	165,711	139,857	310,601	254,771
Interest and other income	259	277	431	1,288
Other expenses	(9,517)	(4,630)	(16,584)	(6,790)
Interest:
Expense incurred, net	(115,618)	(119,997)	(234,247)	(240,443)
Amortization of deferred financing costs	(4,063)	(4,396)	(7,037)	(7,401)
Income before income and other taxes, net gain on sales of land parcels and discontinued operations	36,772	11,111	53,164	1,425
Income and other tax (expense) benefit	(214)	(202)	(405)	(386)
Net gain on sales of land parcels	0	4,217	0	4,217
Income from continuing operations	36,558	15,126	52,759	5,256
Discontinued operations, net	71,757	566,627	207,723	709,563
Net income	108,315	581,753	260,482	714,819
Net (income) attributable to Noncontrolling Interests - Partially Owned Properties	(319)	(71)	(769)	(31)
Net income attributable to controlling interests	103,264	555,924	248,563	683,255
Earnings per Unit - basic:
Weighted average Units outstanding	314,255	307,954	313,133	307,106
Earnings per Unit - diluted:
Weighted average Units outstanding	317,648	312,199	316,457	307,106
OPERATING PARTNERSHIP
REVENUES
Rental income	541,569	478,419	1,063,162	939,121
Fee and asset management	2,212	1,948	4,276	3,754
Total revenues	543,781	480,367	1,067,438	942,875
EXPENSES
Property and maintenance	107,024	98,571	218,004	202,157
Real estate taxes and insurance	63,126	54,803	118,768	106,610
Property management	21,008	20,767	44,417	43,148
Fee and asset management	1,180	1,009	2,487	1,957
Depreciation	172,338	154,452	346,079	311,891
General and administrative	13,394	10,908	27,082	22,341
Total expenses	378,070	340,510	756,837	688,104
Operating income	165,711	139,857	310,601	254,771
Interest and other income	259	277	431	1,288
Other expenses	(9,517)	(4,630)	(16,584)	(6,790)
Interest:
Expense incurred, net	(115,618)	(119,997)	(234,247)	(240,443)
Amortization of deferred financing costs	(4,063)	(4,396)	(7,037)	(7,401)
Income before income and other taxes, net gain on sales of land parcels and discontinued operations	36,772	11,111	53,164	1,425
Income and other tax (expense) benefit	(214)	(202)	(405)	(386)
Net gain on sales of land parcels	0	4,217	0	4,217
Income from continuing operations	36,558	15,126	52,759	5,256
Discontinued operations, net	71,757	566,627	207,723	709,563
Net income	108,315	581,753	260,482	714,819
Net (income) attributable to Noncontrolling Interests - Partially Owned Properties	(319)	(71)	(769)	(31)
Net income attributable to controlling interests	107,996	581,682	259,713	714,788
ALLOCATION OF NET INCOME:
Preference Units	3,467	3,467	6,933	6,933
General Partner	99,797	552,457	241,630	676,322
Limited Partners	4,732	25,758	11,150	31,533
Net income available to Units	$ 104,529	$ 578,215	$ 252,780	$ 707,855
Earnings per Unit - basic:
Income (loss) from continuing operations available to Units	$ 0.104	$ 0.038	$ 0.144	$ (0.006)
Net income available to Units	$ 0.332	$ 1.875	$ 0.807	$ 2.302
Weighted average Units outstanding	314,255	307,954	313,133	307,106
Earnings per Unit - diluted:
Income (loss) from continuing operations available to Units	$ 0.103	$ 0.037	$ 0.142	$ (0.006)
Net income available to Units	$ 0.329	$ 1.852	$ 0.799	$ 2.302
Weighted average Units outstanding	317,648	312,199	316,457	307,106
Distributions declared per Unit outstanding	$ 0.3375	$ 0.3375	$ 0.6750	$ 0.6750