CONSOLIDATED BALANCE SHEETS OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Investment in real estate
Land	$ 6,281,124,000	$ 6,192,512,000
Depreciable property	19,623,472,000	19,226,047,000
Projects under development	865,177,000	988,867,000
Land held for development	295,357,000	393,522,000
Real Estate Investment Property, at Cost	27,065,130,000	26,800,948,000
Real Estate Investment Property, Accumulated Depreciation	(4,992,877,000)	(4,807,709,000)
Investment in real estate, net	22,072,253,000	21,993,239,000
Cash and cash equivalents	37,209,000	53,534,000
Investments in unconsolidated entities	205,068,000	178,526,000
Deposits - restricted	91,081,000	103,567,000
Escrow deposits - mortgage	43,995,000	42,636,000
Deferred financing costs, net	55,754,000	58,486,000
Other assets	384,271,000	404,557,000
Total assets	22,889,631,000	22,834,545,000
Liabilities:
Mortgage notes payable	5,167,626,000	5,174,166,000
Notes, net	5,477,656,000	5,477,088,000
Lines of credit	298,000,000	115,000,000
Accounts payable and accrued expenses	161,838,000	118,791,000
Accrued interest payable	78,140,000	78,309,000
Other liabilities	321,043,000	347,748,000
Security deposits	72,735,000	71,592,000
Distributions payable	187,759,000	243,511,000
Total liabilities	11,764,797,000	11,626,205,000
Commitments and contingencies
Partners’ Capital:
Accumulated other comprehensive (loss)	(162,894,000)	(155,162,000)
Noncontrolling Interests - Partially Owned Properties	127,658,000	126,583,000
Total liabilities and equity	22,889,631,000	22,834,545,000
OPERATING PARTNERSHIP
Investment in real estate
Land	6,281,124,000	6,192,512,000
Depreciable property	19,623,472,000	19,226,047,000
Projects under development	865,177,000	988,867,000
Land held for development	295,357,000	393,522,000
Real Estate Investment Property, at Cost	27,065,130,000	26,800,948,000
Real Estate Investment Property, Accumulated Depreciation	(4,992,877,000)	(4,807,709,000)
Investment in real estate, net	22,072,253,000	21,993,239,000
Cash and cash equivalents	37,209,000	53,534,000
Investments in unconsolidated entities	205,068,000	178,526,000
Deposits - restricted	91,081,000	103,567,000
Escrow deposits - mortgage	43,995,000	42,636,000
Deferred financing costs, net	55,754,000	58,486,000
Other assets	384,271,000	404,557,000
Total assets	22,889,631,000	22,834,545,000
Liabilities:
Mortgage notes payable	5,167,626,000	5,174,166,000
Notes, net	5,477,656,000	5,477,088,000
Lines of credit	298,000,000	115,000,000
Accounts payable and accrued expenses	161,838,000	118,791,000
Accrued interest payable	78,140,000	78,309,000
Other liabilities	321,043,000	347,748,000
Security deposits	72,735,000	71,592,000
Distributions payable	187,759,000	243,511,000
Total liabilities	11,764,797,000	11,626,205,000
Commitments and contingencies
Redeemable Limited Partners	405,276,000	363,144,000
Partners’ Capital:
Preference Units	50,000,000	50,000,000
General Partner	10,489,455,000	10,612,363,000
Limited Partners	215,339,000	211,412,000
Accumulated other comprehensive (loss)	(162,894,000)	(155,162,000)
Total partners’ capital	10,591,900,000	10,718,613,000
Noncontrolling Interests - Partially Owned Properties	127,658,000	126,583,000
Total capital	10,719,558,000	10,845,196,000
Total liabilities and equity	$ 22,889,631,000	$ 22,834,545,000