CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Comprehensive income:
Net income	$ 117,720	$ 336,732	$ 200,452	$ 1,397,766
Other comprehensive (loss) income – derivative instruments:
Unrealized holding (losses) gains arising during the period	(9,929)	9,523	(21,881)	12,337
Losses reclassified into earnings from other comprehensive income	4,206	3,826	8,335	12,098
Other comprehensive income – other instruments:
Unrealized holding gains arising during the period	0	501	0	928
Other comprehensive income – foreign currency:
Currency translation adjustments arising during the period	1,627	1,814	1,718	941
Other comprehensive (loss) income	(4,096)	15,664	(11,828)	26,304
Comprehensive income	113,624	352,396	188,624	1,424,070
Comprehensive (income) loss attributable to Noncontrolling Interests – Partially Owned Properties	(4,873)	(12,568)	(8,175)	(56,342)
Comprehensive income attributable to controlling interests	108,751	339,828	180,449	1,367,728
OPERATING PARTNERSHIP
Comprehensive income:
Net income	117,720	336,732	200,452	1,397,766
Other comprehensive (loss) income – derivative instruments:
Unrealized holding (losses) gains arising during the period	(9,929)	9,523	(21,881)	12,337
Losses reclassified into earnings from other comprehensive income	4,206	3,826	8,335	12,098
Other comprehensive income – other instruments:
Unrealized holding gains arising during the period	0	501	0	928
Other comprehensive income – foreign currency:
Currency translation adjustments arising during the period	1,627	1,814	1,718	941
Other comprehensive (loss) income	(4,096)	15,664	(11,828)	26,304
Comprehensive income	113,624	352,396	188,624	1,424,070
Comprehensive (income) loss attributable to Noncontrolling Interests – Partially Owned Properties	(588)	815	(1,092)	790
Comprehensive income attributable to controlling interests	$ 113,036	$ 353,211	$ 187,532	$ 1,424,860