CONSOLIDATED STATEMENTS OF OPERATIONS OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
REVENUES
Rental income	$ 525,595	$ 464,550
Fee and asset management	2,064	1,806
Total revenues	527,659	466,356
EXPENSES
Property and maintenance	112,379	105,047
Real estate taxes and insurance	55,987	52,139
Property management	23,409	22,381
Fee and asset management	1,307	948
Depreciation	174,737	158,455
General and administrative	13,688	11,433
Total expenses	381,507	350,403
Operating income	146,152	115,953
Interest and other income	172	1,011
Other expenses	(7,067)	(2,160)
Interest:
Expense incurred, net	(118,703)	(120,528)
Amortization of deferred financing costs	(2,974)	(3,005)
Income (loss) before income and other taxes, (loss) from investments in unconsolidated entities, net gain (loss) on sales of unconsolidated entities and land parcels and discontinued operations	17,580	(8,729)
Income and other tax (expense) benefit	(191)	(184)
Income (loss) from continuing operations	17,389	(8,913)
Discontinued operations, net	134,778	141,979
Net income	152,167	133,066
Net (income) attributable to Noncontrolling Interests - Partially Owned Properties	(450)	40
Net income attributable to controlling interests	145,299	127,331
Earnings per Unit - basic:
Weighted average Units outstanding	312,011	306,248
Earnings per Unit - diluted:
Weighted average Units outstanding	315,230	306,248
OPERATING PARTNERSHIP
REVENUES
Rental income	525,595	464,550
Fee and asset management	2,064	1,806
Total revenues	527,659	466,356
EXPENSES
Property and maintenance	112,379	105,047
Real estate taxes and insurance	55,987	52,139
Property management	23,409	22,381
Fee and asset management	1,307	948
Depreciation	174,737	158,455
General and administrative	13,688	11,433
Total expenses	381,507	350,403
Operating income	146,152	115,953
Interest and other income	172	1,011
Other expenses	(7,067)	(2,160)
Interest:
Expense incurred, net	(118,703)	(120,528)
Amortization of deferred financing costs	(2,974)	(3,005)
Income (loss) before income and other taxes, (loss) from investments in unconsolidated entities, net gain (loss) on sales of unconsolidated entities and land parcels and discontinued operations	17,580	(8,729)
Income and other tax (expense) benefit	(191)	(184)
Income (loss) from continuing operations	17,389	(8,913)
Discontinued operations, net	134,778	141,979
Net income	152,167	133,066
Net (income) attributable to Noncontrolling Interests - Partially Owned Properties	(450)	40
Net income attributable to controlling interests	151,717	133,106
ALLOCATION OF NET INCOME:
Preference Units	3,466	3,466
General Partner	141,833	123,865
Limited Partners	6,418	5,775
Net income available to Units	$ 148,251	$ 129,640
Earnings per Unit - basic:
Income (loss) from continuing operations available to Units	$ 0.043	$ (0.040)
Net income available to Units	$ 0.475	$ 0.423
Weighted average Units outstanding	312,011	306,248
Earnings per Unit - diluted:
Income (loss) from continuing operations available to Units	$ 0.043	$ (0.040)
Net income available to Units	$ 0.470	$ 0.423
Weighted average Units outstanding	315,230	306,248
Distributions declared per Unit outstanding	$ 0.3375	$ 0.3375