CONSOLIDATED STATEMENTS OF OPERATIONS OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
REVENUES
Rental income	$ 553,092	$ 490,944	$ 1,602,635	$ 1,417,136
Fee and asset management	3,052	2,928	7,328	6,682
Total revenues	556,144	493,872	1,609,963	1,423,818
EXPENSES
Property and maintenance	110,679	101,712	325,071	300,362
Real estate taxes and insurance	64,235	57,109	182,222	162,430
Property management	18,493	19,175	62,769	62,191
Fee and asset management	1,108	1,250	3,595	3,207
Depreciation	167,406	159,691	509,338	467,416
General and administrative	10,096	10,121	37,178	32,462
Total expenses	372,017	349,058	1,120,173	1,028,068
Operating income	184,127	144,814	489,790	395,750
Interest and other income	70,087	5,313	70,516	6,598
Other expenses	(4,094)	(2,528)	(20,678)	(9,318)
Interest:
Expense incurred, net	(113,876)	(112,449)	(347,452)	(350,957)
Amortization of deferred financing costs	(3,338)	(4,650)	(10,319)	(11,900)
Income before income and other taxes, net gain on sales of land parcels and discontinued operations	132,906	30,500	181,857	30,173
Income and other tax (expense) benefit	(222)	(283)	(627)	(669)
(Loss) from investments in unconsolidated entities	(3)	0	(3)	0
Gain Loss On Sale Of Land Parcels	0	0	0	4,217
Income from continuing operations	132,681	30,217	181,227	33,721
Discontinued operations, net	103,642	82,760	315,578	794,075
Net income	236,323	112,977	496,805	827,796
Net (income) attributable to Noncontrolling Interests - Partially Owned Properties	312	(387)	(457)	(418)
Net income attributable to controlling interests	226,139	107,848	474,702	791,103
ALLOCATION OF NET INCOME:
Redemption Premium	5,150	0	5,150	0
Earnings per Unit - basic:
Income (loss) from continuing operations available to Units	$ 0.397	$ 0.085	$ 0.529	$ 0.074
Net income available to Units	$ 0.725	$ 0.353	$ 1.534	$ 2.651
Weighted average Units outstanding	315,513	308,884	313,932	307,705
Earnings per Unit - diluted:
Income (loss) from continuing operations available to Units	$ 0.394	$ 0.084	$ 0.524	$ 0.073
Net income available to Units	$ 0.719	$ 0.349	$ 1.519	$ 2.619
Weighted average Units outstanding	318,773	312,844	317,265	311,908
OPERATING PARTNERSHIP
REVENUES
Rental income	553,092	490,944	1,602,635	1,417,136
Fee and asset management	3,052	2,928	7,328	6,682
Total revenues	556,144	493,872	1,609,963	1,423,818
EXPENSES
Property and maintenance	110,679	101,712	325,071	300,362
Real estate taxes and insurance	64,235	57,109	182,222	162,430
Property management	18,493	19,175	62,769	62,191
Fee and asset management	1,108	1,250	3,595	3,207
Depreciation	167,406	159,691	509,338	467,416
General and administrative	10,096	10,121	37,178	32,462
Total expenses	372,017	349,058	1,120,173	1,028,068
Operating income	184,127	144,814	489,790	395,750
Interest and other income	70,087	5,313	70,516	6,598
Other expenses	(4,094)	(2,528)	(20,678)	(9,318)
Interest:
Expense incurred, net	(113,876)	(112,449)	(347,452)	(350,957)
Amortization of deferred financing costs	(3,338)	(4,650)	(10,319)	(11,900)
Income before income and other taxes, net gain on sales of land parcels and discontinued operations	132,906	30,500	181,857	30,173
Income and other tax (expense) benefit	(222)	(283)	(627)	(669)
(Loss) from investments in unconsolidated entities	(3)	0	(3)	0
Gain Loss On Sale Of Land Parcels	0	0	0	4,217
Income from continuing operations	132,681	30,217	181,227	33,721
Discontinued operations, net	103,642	82,760	315,578	794,075
Net income	236,323	112,977	496,805	827,796
Net (income) attributable to Noncontrolling Interests - Partially Owned Properties	312	(387)	(457)	(418)
Net income attributable to controlling interests	236,635	112,590	496,348	827,378
ALLOCATION OF NET INCOME:
Preference Units	2,386	3,466	9,319	10,399
General Partner	218,603	104,382	460,233	780,704
Limited Partners	10,496	4,742	21,646	36,275
Net income available to Units	$ 229,099	$ 109,124	$ 481,879	$ 816,979
Earnings per Unit - basic:
Income (loss) from continuing operations available to Units	$ 0.400	$ 0.090	$ 0.530	$ 0.070
Net income available to Units	$ 0.730	$ 0.350	$ 1.530	$ 2.650
Weighted average Units outstanding	315,513	308,884	313,932	307,705
Earnings per Unit - diluted:
Income (loss) from continuing operations available to Units	$ 0.390	$ 0.080	$ 0.520	$ 0.070
Net income available to Units	$ 0.720	$ 0.350	$ 1.520	$ 2.620
Weighted average Units outstanding	318,773	312,844	317,265	311,908
Distributions declared per Unit outstanding	$ 0.3375	$ 0.3375	$ 1.0125	$ 1.0125