CONSOLIDATED STATEMENTS OF CASH FLOWS OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 498,297	$ 4,177,723
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	542,964	528,242
Amortization of deferred financing costs	6,447	10,000
Amortization of above/below market lease intangibles	2,729	2,566
Amortization of discounts and premiums on debt	4,939	(18,328)
Amortization of deferred settlements on derivative instruments	14,010	37,187
Write-off of pursuit costs	2,329	3,379
Loss (income) from investments in unconsolidated entities	2,153	(5,846)
Distributions from unconsolidated entities – return on capital	2,031	2,165
Net (gain) on sales of investment securities and other investments		(58,416)
Net (gain) on sales of real estate properties	(141,761)	(3,870,871)
Net (gain) on sales of land parcels	(19,170)	(15,759)
Net (gain) on sales of discontinued operations		(43)
Compensation paid with Company Common Shares	19,999	25,540
Changes in assets and liabilities:
Decrease in deposits – restricted	788	9,992
Decrease in mortgage deposits	1,447	222
(Increase) decrease in other assets	(23,024)	4,248
Increase in accounts payable and accrued expenses	62,635	41,371
Increase (decrease) in accrued interest payable	11,865	(15,780)
(Decrease) in other liabilities	(28,250)	(24,749)
Increase (decrease) in security deposits	2,606	(13,522)
Net cash provided by operating activities	963,034	819,321
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions	(466,395)	(205,881)
Investment in real estate – development/other	(227,187)	(454,502)
Capital expenditures to real estate	(143,258)	(124,551)
Non-real estate capital additions	(776)	(4,467)
Interest capitalized for real estate under development	(23,164)	(41,658)
Proceeds from disposition of real estate, net	350,000	6,584,126
Investments in unconsolidated entities	(5,324)	(3,826)
Distributions from unconsolidated entities – return of capital	329	13,798
Proceeds from sale of investment securities and other investments		72,815
Decrease (increase) in deposits on real estate acquisitions and investments, net	39,519	(83,668)
(Increase) in mortgage deposits	(4,541)	(21)
Net cash (used for) provided by investing activities	(480,797)	5,752,165
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt financing costs	(6,272)	(507)
Mortgage deposits	57,057	(6,249)
Mortgage notes payable, net:
Lump sum payoffs	(493,420)	(565,084)
Scheduled principal repayments	(8,771)	(6,644)
Notes, net:
Proceeds	692,466
Lump sum payoffs	(394,077)	(1,500,000)
Line of credit and commercial paper:
Line of credit proceeds	1,845,000	246,000
Line of credit repayments	(1,845,000)	(246,000)
Commercial paper proceeds	3,888,675	1,324,784
Commercial paper repayments	(3,681,750)	(1,712,472)
Proceeds from settlement of derivative instruments	1,296
Proceeds from EQR's Employee Share Purchase Plan (ESPP)	2,963	2,778
Proceeds from exercise of EQR options	12,967	26,939
Payment of offering costs	(36)	(304)
Other financing activities, net	(40)	(33)
Contributions – Noncontrolling Interests – Partially Owned Properties	125
Contributions – Limited Partners		1
Distributions:
OP Units – General Partner	(554,267)	(3,490,838)
Preference Units	(2,318)	(2,318)
OP Units – Limited Partners	(20,604)	(137,641)
Noncontrolling Interests – Partially Owned Properties	(6,873)	(28,588)
Net cash (used for) financing activities	(512,879)	(6,096,176)
Net (decrease) increase in cash and cash equivalents	(30,642)	475,310
Cash and cash equivalents, beginning of period	77,207	42,276
Cash and cash equivalents, end of period	46,565	517,586
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	257,805	383,374
Net cash paid for income and other taxes	964	1,333
Real estate acquisitions/dispositions/other:
Mortgage loans assumed		43,400
Amortization of deferred financing costs:
Other assets	1,810	2,291
Mortgage notes payable, net	1,943	3,320
Notes, net	2,694	4,389
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	247	(21,318)
Notes, net	1,771	2,578
Line of credit and commercial paper	2,921	412
Amortization of deferred settlements on derivative instruments:
Other liabilities	(9)	(75)
Accumulated other comprehensive income	14,019	37,262
Write-off of pursuit costs:
Investment in real estate, net	2,292	2,876
Other assets	17	399
Accounts payable and accrued expenses	20	104
Loss (income) from investments in unconsolidated entities:
Investments in unconsolidated entities	1,076	(6,999)
Other liabilities	1,077	1,153
Realized/unrealized (gain) loss on derivative instruments:
Other assets	(3,803)	(4,563)
Notes, net	(1,413)	4,563
Other liabilities		4,240
Accumulated other comprehensive income	5,216	(4,240)
Investments in unconsolidated entities:
Investments in unconsolidated entities	(2,324)	(1,726)
Other liabilities	(3,000)	(2,100)
Distributions from unconsolidated entities - return of capital:
Investments in unconsolidated entities	329	14,014
Other assets		(216)
Debt financing costs:
Mortgage notes payable, net		(507)
Notes, net	(6,272)
Other:
Foreign currency translation adjustments		(264)
ERPOP [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	498,297	4,177,723
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	542,964	528,242
Amortization of deferred financing costs	6,447	10,000
Amortization of above/below market lease intangibles	2,729	2,566
Amortization of discounts and premiums on debt	4,939	(18,328)
Amortization of deferred settlements on derivative instruments	14,010	37,187
Write-off of pursuit costs	2,329	3,379
Loss (income) from investments in unconsolidated entities	2,153	(5,846)
Distributions from unconsolidated entities – return on capital	2,031	2,165
Net (gain) on sales of investment securities and other investments		(58,416)
Net (gain) on sales of real estate properties	(141,761)	(3,870,871)
Net (gain) on sales of land parcels	(19,170)	(15,759)
Net (gain) on sales of discontinued operations		(43)
Compensation paid with Company Common Shares	19,999	25,540
Changes in assets and liabilities:
Decrease in deposits – restricted	788	9,992
Decrease in mortgage deposits	1,447	222
(Increase) decrease in other assets	(23,024)	4,248
Increase in accounts payable and accrued expenses	62,635	41,371
Increase (decrease) in accrued interest payable	11,865	(15,780)
(Decrease) in other liabilities	(28,250)	(24,749)
Increase (decrease) in security deposits	2,606	(13,522)
Net cash provided by operating activities	963,034	819,321
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions	(466,395)	(205,881)
Investment in real estate – development/other	(227,187)	(454,502)
Capital expenditures to real estate	(143,258)	(124,551)
Non-real estate capital additions	(776)	(4,467)
Interest capitalized for real estate under development	(23,164)	(41,658)
Proceeds from disposition of real estate, net	350,000	6,584,126
Investments in unconsolidated entities	(5,324)	(3,826)
Distributions from unconsolidated entities – return of capital	329	13,798
Proceeds from sale of investment securities and other investments		72,815
Decrease (increase) in deposits on real estate acquisitions and investments, net	39,519	(83,668)
(Increase) in mortgage deposits	(4,541)	(21)
Net cash (used for) provided by investing activities	(480,797)	5,752,165
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt financing costs	(6,272)	(507)
Mortgage deposits	57,057	(6,249)
Mortgage notes payable, net:
Lump sum payoffs	(493,420)	(565,084)
Scheduled principal repayments	(8,771)	(6,644)
Notes, net:
Proceeds	692,466
Lump sum payoffs	(394,077)	(1,500,000)
Line of credit and commercial paper:
Line of credit proceeds	1,845,000	246,000
Line of credit repayments	(1,845,000)	(246,000)
Commercial paper proceeds	3,888,675	1,324,784
Commercial paper repayments	(3,681,750)	(1,712,472)
Proceeds from settlement of derivative instruments	1,296
Proceeds from EQR's Employee Share Purchase Plan (ESPP)	2,963	2,778
Proceeds from exercise of EQR options	12,967	26,939
Payment of offering costs	(36)	(304)
Other financing activities, net	(40)	(33)
Contributions – Noncontrolling Interests – Partially Owned Properties	125
Contributions – Limited Partners		1
Distributions:
OP Units – General Partner	(554,267)	(3,490,838)
Preference Units	(2,318)	(2,318)
OP Units – Limited Partners	(20,604)	(137,641)
Noncontrolling Interests – Partially Owned Properties	(6,873)	(28,588)
Net cash (used for) financing activities	(512,879)	(6,096,176)
Net (decrease) increase in cash and cash equivalents	(30,642)	475,310
Cash and cash equivalents, beginning of period	77,207	42,276
Cash and cash equivalents, end of period	46,565	517,586
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	257,805	383,374
Net cash paid for income and other taxes	964	1,333
Real estate acquisitions/dispositions/other:
Mortgage loans assumed		43,400
Amortization of deferred financing costs:
Other assets	1,810	2,291
Mortgage notes payable, net	1,943	3,320
Notes, net	2,694	4,389
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	247	(21,318)
Notes, net	1,771	2,578
Line of credit and commercial paper	2,921	412
Amortization of deferred settlements on derivative instruments:
Other liabilities	(9)	(75)
Accumulated other comprehensive income	14,019	37,262
Write-off of pursuit costs:
Investment in real estate, net	2,292	2,876
Other assets	17	399
Accounts payable and accrued expenses	20	104
Loss (income) from investments in unconsolidated entities:
Investments in unconsolidated entities	1,076	(6,999)
Other liabilities	1,077	1,153
Realized/unrealized (gain) loss on derivative instruments:
Other assets	(3,803)	(4,563)
Notes, net	(1,413)	4,563
Other liabilities		4,240
Accumulated other comprehensive income	5,216	(4,240)
Investments in unconsolidated entities:
Investments in unconsolidated entities	(2,324)	(1,726)
Other liabilities	(3,000)	(2,100)
Distributions from unconsolidated entities - return of capital:
Investments in unconsolidated entities	329	14,014
Other assets		(216)
Debt financing costs:
Mortgage notes payable, net		(507)
Notes, net	$ (6,272)
Other:
Foreign currency translation adjustments		$ (264)