CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Comprehensive income:
Net income	$ 82,732	$ 1,061,034
Other comprehensive (loss) income – derivative instruments:
Unrealized holding (losses) gains arising during the period	(11,952)	2,814
Losses reclassified into earnings from other comprehensive income	(4,129)	(8,272)
Other comprehensive income – other instruments:
Unrealized holding gains arising during the period	0	427
Other comprehensive income (loss) – foreign currency:
Currency translation adjustments arising during the period	91	(873)
Other comprehensive (loss) income	(7,732)	10,640
Comprehensive income	75,000	1,071,674
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(3,302)	(43,774)
Comprehensive income attributable to controlling interests	71,698	1,027,900
OPERATING PARTNERSHIP
Comprehensive income:
Net income	82,732	1,061,034
Other comprehensive (loss) income – derivative instruments:
Unrealized holding (losses) gains arising during the period	(11,952)	2,814
Losses reclassified into earnings from other comprehensive income	4,129	8,272
Other comprehensive income – other instruments:
Unrealized holding gains arising during the period	0	427
Other comprehensive income (loss) – foreign currency:
Currency translation adjustments arising during the period	91	(873)
Other comprehensive (loss) income	(7,732)	10,640
Comprehensive income	75,000	1,071,674
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(504)	(25)
Comprehensive income attributable to controlling interests	$ 74,496	$ 1,071,649