CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Comprehensive income:
Net income	$ 231,190	$ 391,717	$ 431,642	$ 1,789,483
Other comprehensive (loss) income – derivative instruments:
Unrealized holding (losses) gains arising during the period	97	(3,600)	(21,784)	8,737
Losses reclassified into earnings from other comprehensive income	4,271	3,986	12,606	16,084
Other comprehensive income (loss) – other instruments:
Unrealized holding gains (losses) arising during the period	0	(374)	0	554
(Gains) realized during the period	0	(830)	0	(830)
Other comprehensive (loss) – foreign currency:
Currency translation adjustments arising during the period	(2,184)	(1,730)	(466)	(789)
Other comprehensive (loss) income	2,184	(2,548)	(9,644)	23,756
Comprehensive income	233,374	389,169	421,998	1,813,239
Comprehensive (income) loss attributable to Noncontrolling Interests – Partially Owned Properties	(9,530)	(14,428)	(17,705)	(70,770)
Comprehensive income attributable to controlling interests	223,844	374,741	404,293	1,742,469
OPERATING PARTNERSHIP
Comprehensive income:
Net income	231,190	391,717	431,642	1,789,483
Other comprehensive (loss) income – derivative instruments:
Unrealized holding (losses) gains arising during the period	97	(3,600)	(21,784)	8,737
Losses reclassified into earnings from other comprehensive income	4,271	3,986	12,606	16,084
Other comprehensive income (loss) – other instruments:
Unrealized holding gains (losses) arising during the period	0	(374)	0	554
(Gains) realized during the period	0	(830)	0	(830)
Other comprehensive (loss) – foreign currency:
Currency translation adjustments arising during the period	(2,184)	(1,730)	(466)	(789)
Other comprehensive (loss) income	2,184	(2,548)	(9,644)	23,756
Comprehensive income	233,374	389,169	421,998	1,813,239
Comprehensive (income) loss attributable to Noncontrolling Interests – Partially Owned Properties	(708)	311	(1,800)	1,101
Comprehensive income attributable to controlling interests	$ 232,666	$ 389,480	$ 420,198	$ 1,814,340