CONSOLIDATED STATEMENTS OF CASH FLOWS OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 3,960,231	$ 488,842
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	349,012	388,803
Amortization of deferred financing costs	7,739	5,127
Amortization of above/below market leases	1,708	1,691
Amortization of discounts and premiums on debt	(19,010)	(5,611)
Amortization of deferred settlements on derivative instruments	32,850	8,751
Write-off of pursuit costs	2,563	1,651
Loss (income) from investments in unconsolidated entities	1,904	(15,429)
Distributions from unconsolidated entities – return on capital	1,482	2,193
Net (gain) on sales of investment securities and other investments	(55,156)	(387)
Net (gain) on sales of real estate properties	(3,780,835)	(228,753)
Net (gain) loss on sales of land parcels	(11,722)	1
Net (gain) on sales of discontinued operations	(15)	0
Realized/unrealized loss on derivative instruments	0	51
Compensation paid with Company Common Shares	20,729	24,017
Changes in assets and liabilities:
Decrease (increase) in deposits – restricted	9,121	(288)
(Increase) in mortgage deposits	(840)	(382)
Decrease (increase) in other assets	29,944	(4,553)
Increase in accounts payable and accrued expenses	7,837	22,350
(Decrease) in accrued interest payable	(27,046)	(2,409)
(Decrease) in other liabilities	(42,080)	(11,097)
(Decrease) increase in security deposits	(13,340)	479
Net cash provided by operating activities	475,076	675,047
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions	(160,680)	(136,995)
Investment in real estate – development/other	(312,853)	(324,343)
Capital expenditures to real estate	(74,450)	(81,962)
Non-real estate capital additions	(3,259)	(1,955)
Interest capitalized for real estate under development	(28,386)	(30,432)
Proceeds from disposition of real estate, net	6,415,181	379,863
Investments in unconsolidated entities	(1,829)	(4,786)
Distributions from unconsolidated entities – return of capital	524	26,147
Proceeds from sale of investment securities and other investments	68,528	387
(Increase) in deposits on real estate acquisitions and investments, net	(30,815)	(31,247)
Decrease (increase) in mortgage deposits	46	(226)
Net cash provided by (used for) investing activities	5,872,007	(205,549)
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt financing costs	(437)	(6,352)
Mortgage deposits	(3,971)	(4,169)
Mortgage notes payable, net:
Lump sum payoffs	(556,499)	(121,488)
Scheduled principal repayments	(4,740)	(5,028)
Notes, net:
Proceeds	0	746,391
Lump sum payoffs	(1,500,000)	(300,000)
Line of credit and commercial paper:
Line of credit proceeds	246,000	3,553,000
Line of credit repayments	(246,000)	(3,886,000)
Commercial paper proceeds	1,324,784	2,266,924
Commercial paper repayments	(1,712,472)	(2,267,500)
(Payments on) settlement of derivative instruments	0	(13,938)
Proceeds from EQR's Employee Share Purchase Plan (ESPP)	2,023	2,610
Proceeds from exercise of options	26,141	33,984
Redemption of Preference Units	0	(9,820)
Premium on redemption of Preference Units	0	(2,789)
Payment of offering costs	0	(40)
Other financing activities, net	(33)	(33)
Contributions – Limited Partners	1	1
Distributions:
Noncontrolling Interests – Partially Owned Properties	(27,681)	(3,995)
Net cash (used for) financing activities	(5,891,516)	(417,469)
Net increase in cash and cash equivalents	455,567	52,029
Cash and cash equivalents, beginning of period	42,276	40,080
Cash and cash equivalents, end of period	497,843	92,109
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	313,480	218,965
Net cash paid for income and other taxes	1,166	895
Real estate acquisitions/dispositions/other:
Mortgage loans assumed	43,400	0
Amortization of deferred financing costs:
Other assets	1,527	1,527
Mortgage notes payable, net	2,617	1,607
Notes, net	3,595	1,993
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	(21,476)	(7,420)
Notes, net	2,054	1,233
Line of credit and commercial paper	412	576
Amortization of deferred settlements on derivative instruments:
Other liabilities	(72)	(160)
Accumulated other comprehensive income	32,922	8,911
Write-off of pursuit costs:
Investment in real estate, net	2,072	1,260
Deposits – restricted	0	330
Other assets	390	61
Accounts payable and accrued expenses	101	0
Loss (income) from investments in unconsolidated entities:
Investments in unconsolidated entities	1,122	(16,767)
Other liabilities	782	1,338
Distributions from unconsolidated entities – return on capital:
Investments in unconsolidated entities	1,482	2,125
Other liabilities	0	68
Realized/unrealized loss on derivative instruments:
Other assets	(8,390)	(3,873)
Notes, net	8,390	2,358
Other liabilities	4,467	1,678
Unrealized holding (losses) gains arising during the period	(4,467)	(112)
Investments in unconsolidated entities:
Investments in unconsolidated entities	(929)	(1,291)
Other liabilities	(900)	(3,495)
Debt financing costs:
Mortgage notes payable, net	(437)	0
Notes, net	0	(6,352)
Other:
Foreign currency translation adjustments	(50)	502
ERPOP [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	3,960,231	488,842
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	349,012	388,803
Amortization of deferred financing costs	7,739	5,127
Amortization of above/below market leases	1,708	1,691
Amortization of discounts and premiums on debt	(19,010)	(5,611)
Amortization of deferred settlements on derivative instruments	32,850	8,751
Write-off of pursuit costs	2,563	1,651
Loss (income) from investments in unconsolidated entities	1,904	(15,429)
Distributions from unconsolidated entities – return on capital	1,482	2,193
Net (gain) on sales of investment securities and other investments	(55,156)	(387)
Net (gain) on sales of real estate properties	(3,780,835)	(228,753)
Net (gain) loss on sales of land parcels	(11,722)	1
Net (gain) on sales of discontinued operations	(15)	0
Realized/unrealized loss on derivative instruments	0	51
Compensation paid with Company Common Shares	20,729	24,017
Changes in assets and liabilities:
Decrease (increase) in deposits – restricted	9,121	(288)
(Increase) in mortgage deposits	(840)	(382)
Decrease (increase) in other assets	29,944	(4,553)
Increase in accounts payable and accrued expenses	7,837	22,350
(Decrease) in accrued interest payable	(27,046)	(2,409)
(Decrease) in other liabilities	(42,080)	(11,097)
(Decrease) increase in security deposits	(13,340)	479
Net cash provided by operating activities	475,076	675,047
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions	(160,680)	(136,995)
Investment in real estate – development/other	(312,853)	(324,343)
Capital expenditures to real estate	(74,450)	(81,962)
Non-real estate capital additions	(3,259)	(1,955)
Interest capitalized for real estate under development	(28,386)	(30,432)
Proceeds from disposition of real estate, net	6,415,181	379,863
Investments in unconsolidated entities	(1,829)	(4,786)
Distributions from unconsolidated entities – return of capital	524	26,147
Proceeds from sale of investment securities and other investments	68,528	387
(Increase) in deposits on real estate acquisitions and investments, net	(30,815)	(31,247)
Decrease (increase) in mortgage deposits	46	(226)
Net cash provided by (used for) investing activities	5,872,007	(205,549)
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt financing costs	(437)	(6,352)
Mortgage deposits	(3,971)	(4,169)
Mortgage notes payable, net:
Lump sum payoffs	(556,499)	(121,488)
Scheduled principal repayments	(4,740)	(5,028)
Notes, net:
Proceeds	0	746,391
Lump sum payoffs	(1,500,000)	(300,000)
Line of credit and commercial paper:
Line of credit proceeds	246,000	3,553,000
Line of credit repayments	(246,000)	(3,886,000)
Commercial paper proceeds	1,324,784	2,266,924
Commercial paper repayments	(1,712,472)	(2,267,500)
(Payments on) settlement of derivative instruments	0	(13,938)
Proceeds from EQR's Employee Share Purchase Plan (ESPP)	2,023	2,610
Proceeds from exercise of options	26,141	33,984
Redemption of Preference Units	0	(9,820)
Premium on redemption of Preference Units	0	(2,789)
Payment of offering costs	0	(40)
Other financing activities, net	(33)	(33)
Contributions – Limited Partners	1	1
Distributions:
OP Units – General Partner	(3,306,704)	(382,441)
Preference Units	(1,545)	(1,724)
OP Units – Limited Partners	(130,383)	(15,062)
Noncontrolling Interests – Partially Owned Properties	(27,681)	(3,995)
Net cash (used for) financing activities	(5,891,516)	(417,469)
Net increase in cash and cash equivalents	455,567	52,029
Cash and cash equivalents, beginning of period	42,276	40,080
Cash and cash equivalents, end of period	497,843	92,109
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	313,480	218,965
Net cash paid for income and other taxes	1,166	895
Real estate acquisitions/dispositions/other:
Mortgage loans assumed	43,400	0
Amortization of deferred financing costs:
Other assets	1,527	1,527
Mortgage notes payable, net	2,617	1,607
Notes, net	3,595	1,993
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	(21,476)	(7,420)
Notes, net	2,054	1,233
Line of credit and commercial paper	412	576
Amortization of deferred settlements on derivative instruments:
Other liabilities	(72)	(160)
Accumulated other comprehensive income	32,922	8,911
Write-off of pursuit costs:
Investment in real estate, net	2,072	1,260
Deposits – restricted	0	330
Other assets	390	61
Accounts payable and accrued expenses	101	0
Loss (income) from investments in unconsolidated entities:
Investments in unconsolidated entities	1,122	(16,767)
Other liabilities	782	1,338
Distributions from unconsolidated entities – return on capital:
Investments in unconsolidated entities	1,482	2,125
Other liabilities	0	68
Realized/unrealized loss on derivative instruments:
Other assets	(8,390)	(3,873)
Notes, net	8,390	2,358
Other liabilities	4,467	1,678
Unrealized holding (losses) gains arising during the period	(4,467)	(112)
Investments in unconsolidated entities:
Investments in unconsolidated entities	(929)	(1,291)
Other liabilities	(900)	(3,495)
Debt financing costs:
Mortgage notes payable, net	(437)	0
Notes, net	0	(6,352)
Other:
Foreign currency translation adjustments	$ (50)	$ 502