CONSOLIDATED BALANCE SHEETS OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Investment in real estate
Land	$ 5,835,195	$ 5,864,046
Depreciable property	18,474,391	18,037,087
Projects under development	799,947	1,122,376
Land held for development	138,221	158,843
Investment in real estate	25,247,754	25,182,352
Accumulated depreciation	(5,119,342)	(4,905,406)
Investment in real estate, net	20,128,412	20,276,946
Real estate held for sale	0	2,181,135
Cash and cash equivalents	497,843	42,276
Investments in unconsolidated entities	65,952	68,101
Deposits – restricted	77,587	55,893
Escrow deposits – mortgage	61,711	56,946
Other assets	398,417	428,899
Total assets	21,229,922	23,110,196
Liabilities:
Mortgage notes payable, net	4,147,999	4,685,134
Notes, net	4,362,995	5,848,956
Line of credit and commercial paper	0	387,276
Accounts payable and accrued expenses	186,629	187,124
Accrued interest payable	58,175	85,221
Other liabilities	333,551	366,387
Security deposits	64,242	77,582
Distributions payable	191,403	209,378
Total liabilities	9,344,994	11,847,058
Commitments and contingencies
Partners' Capital:
Accumulated other comprehensive (loss)	(123,511)	(152,016)
Noncontrolling Interests – Partially Owned Properties	4,278	4,608
Total liabilities and equity	21,229,922	23,110,196
ERPOP [Member]
Investment in real estate
Land	5,835,195	5,864,046
Depreciable property	18,474,391	18,037,087
Projects under development	799,947	1,122,376
Land held for development	138,221	158,843
Investment in real estate	25,247,754	25,182,352
Accumulated depreciation	(5,119,342)	(4,905,406)
Investment in real estate, net	20,128,412	20,276,946
Real estate held for sale	0	2,181,135
Cash and cash equivalents	497,843	42,276
Investments in unconsolidated entities	65,952	68,101
Deposits – restricted	77,587	55,893
Escrow deposits – mortgage	61,711	56,946
Other assets	398,417	428,899
Total assets	21,229,922	23,110,196
Liabilities:
Mortgage notes payable, net	4,147,999	4,685,134
Notes, net	4,362,995	5,848,956
Line of credit and commercial paper	0	387,276
Accounts payable and accrued expenses	186,629	187,124
Accrued interest payable	58,175	85,221
Other liabilities	333,551	366,387
Security deposits	64,242	77,582
Distributions payable	191,403	209,378
Total liabilities	9,344,994	11,847,058
Commitments and contingencies
Redeemable Limited Partners	478,324	566,783
Partners' Capital:
Preference Units	37,280	37,280
General Partner	11,246,809	10,585,104
Limited Partners	241,748	221,379
Accumulated other comprehensive (loss)	(123,511)	(152,016)
Total partners' capital	11,402,326	10,691,747
Noncontrolling Interests – Partially Owned Properties	4,278	4,608
Total capital	11,406,604	10,696,355
Total liabilities and equity	$ 21,229,922	$ 23,110,196