CONSOLIDATED STATEMENTS OF CASH FLOWS OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 109,257	$ 220,548
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	204,215	196,309
Amortization of deferred financing costs	2,136	3,679
Amortization of above/below market lease intangibles	(18)	1,098
Amortization of discounts and premiums on debt	1,418	1,532
Amortization of deferred settlements on derivative instruments	4,390	4,788
Amortization of right-of-use assets	4,022
Write-off of pursuit costs	1,448	931
(Income) loss from investments in unconsolidated entities	707	977
Distributions from unconsolidated entities – return on capital	693	615
Net (gain) loss on sales of real estate properties	21	(142,213)
Net (gain) loss on sales of land parcels	(1)
Net (gain) loss on debt extinguishment		22,110
Compensation paid with Company Common Shares	9,806	10,278
Changes in assets and liabilities:
(Increase) decrease in other assets	(14,325)	(15,396)
Increase (decrease) in accounts payable and accrued expenses	63,789	48,997
Increase (decrease) in accrued interest payable	11,406	11,718
Increase (decrease) in lease liabilities	(554)
Increase (decrease) in other liabilities	(25,942)	(4,692)
Increase (decrease) in security deposits	1,077	(261)
Net cash provided by operating activities	373,545	361,018
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions	(258,938)	(54,134)
Investment in real estate – development/other	(45,327)	(40,813)
Capital expenditures to real estate	(34,018)	(36,747)
Non-real estate capital additions	(1,018)	(1,191)
Interest capitalized for real estate under development	(1,202)	(1,688)
Proceeds from disposition of real estate, net		284,670
Investments in unconsolidated entities	(6,281)	(2,799)
Purchase of investment securities and other investments	(251)
Net cash provided by (used for) investing activities	(347,035)	147,298
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt financing costs	(1,492)	(4,345)
Mortgage notes payable, net:
Proceeds	288,120
Lump sum payoffs		(725,639)
Scheduled principal repayments	(1,619)	(1,720)
Notes, net:
Proceeds		497,010
Line of credit and commercial paper:
Line of credit proceeds	1,995,000	415,000
Line of credit repayments	(1,995,000)	(415,000)
Commercial paper proceeds	3,985,661	1,107,561
Commercial paper repayments	(4,140,000)	(1,173,000)
Proceeds from (payments on) settlement of derivative instruments		1,638
Proceeds from Employee Share Purchase Plan (ESPP)	1,126	1,681
Proceeds from exercise of EQR options	29,860	1,600
Payment of offering costs		(26)
Contributions – Noncontrolling Interests – Partially Owned Properties		125
Contributions – Limited Partners		1
Distributions:
OP Units – General Partner	(199,749)	(185,484)
Preference Units		(773)
OP Units – Limited Partners	(7,256)	(6,666)
Noncontrolling Interests – Partially Owned Properties	(3,968)	(4,220)
Net cash provided by (used for) financing activities	(49,317)	(514,367)
Net increase (decrease) in cash and cash equivalents and restricted deposits	(22,807)	(6,051)
Cash and cash equivalents and restricted deposits, beginning of period	116,313	100,762
Cash and cash equivalents and restricted deposits, end of period	93,506	94,711
Cash and cash equivalents	29,391	44,453
Restricted deposits	64,115	50,258
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	74,777	96,404
Net cash paid for income and other taxes	531	462
Amortization of deferred financing costs:
Other assets	603	603
Mortgage notes payable, net	416	2,084
Notes, net	1,117	992
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	736	897
Notes, net	682	635
Amortization of deferred settlements on derivative instruments:
Other liabilities	(3)	(3)
Accumulated other comprehensive income	4,393	4,791
Write-off of pursuit costs:
Investment in real estate, net	1,437	931
Other assets	11
(Income) loss from investments in unconsolidated entities:
Investments in unconsolidated entities	364	627
Other liabilities	343	350
Realized/unrealized (gain) loss on derivative instruments:
Other assets	1,337	(9,132)
Notes, net	1,255	(2,289)
Other liabilities	11,828	5,334
Accumulated other comprehensive income	(14,420)	6,087
Investments in unconsolidated entities:
Investments in unconsolidated entities	(5,561)	(2,079)
Other liabilities	(720)	(720)
Debt financing costs:
Other assets	145
Mortgage notes payable, net	(1,632)
Notes, net	(5)	(4,345)
Right-of-use assets and lease liabilities initial measurement and reclassifications:
Right-of-use assets	(438,705)
Other assets	184,116
Lease liabilities	282,791
Other liabilities	(28,202)
Mortgage Notes Payable, Net [Member]
Mortgage notes payable, net:
Net gain (loss) on debt extinguishment		(22,110)
ERPOP [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	109,257	220,548
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	204,215	196,309
Amortization of deferred financing costs	2,136	3,679
Amortization of above/below market lease intangibles	(18)	1,098
Amortization of discounts and premiums on debt	1,418	1,532
Amortization of deferred settlements on derivative instruments	4,390	4,788
Amortization of right-of-use assets	4,022
Write-off of pursuit costs	1,448	931
(Income) loss from investments in unconsolidated entities	707	977
Distributions from unconsolidated entities – return on capital	693	615
Net (gain) loss on sales of real estate properties	21	(142,213)
Net (gain) loss on sales of land parcels	(1)
Net (gain) loss on debt extinguishment		22,110
Compensation paid with Company Common Shares	9,806	10,278
Changes in assets and liabilities:
(Increase) decrease in other assets	(14,325)	(15,396)
Increase (decrease) in accounts payable and accrued expenses	63,789	48,997
Increase (decrease) in accrued interest payable	11,406	11,718
Increase (decrease) in lease liabilities	(554)
Increase (decrease) in other liabilities	(25,942)	(4,692)
Increase (decrease) in security deposits	1,077	(261)
Net cash provided by operating activities	373,545	361,018
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions	(258,938)	(54,134)
Investment in real estate – development/other	(45,327)	(40,813)
Capital expenditures to real estate	(34,018)	(36,747)
Non-real estate capital additions	(1,018)	(1,191)
Interest capitalized for real estate under development	(1,202)	(1,688)
Proceeds from disposition of real estate, net		284,670
Investments in unconsolidated entities	(6,281)	(2,799)
Purchase of investment securities and other investments	(251)
Net cash provided by (used for) investing activities	(347,035)	147,298
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt financing costs	(1,492)	(4,345)
Mortgage notes payable, net:
Proceeds	288,120
Lump sum payoffs		(725,639)
Scheduled principal repayments	(1,619)	(1,720)
Notes, net:
Proceeds		497,010
Line of credit and commercial paper:
Line of credit proceeds	1,995,000	415,000
Line of credit repayments	(1,995,000)	(415,000)
Commercial paper proceeds	3,985,661	1,107,561
Commercial paper repayments	(4,140,000)	(1,173,000)
Proceeds from (payments on) settlement of derivative instruments		1,638
Proceeds from Employee Share Purchase Plan (ESPP)	1,126	1,681
Proceeds from exercise of EQR options	29,860	1,600
Payment of offering costs		(26)
Contributions – Noncontrolling Interests – Partially Owned Properties		125
Contributions – Limited Partners		1
Distributions:
OP Units – General Partner	(199,749)	(185,484)
Preference Units		(773)
OP Units – Limited Partners	(7,256)	(6,666)
Noncontrolling Interests – Partially Owned Properties	(3,968)	(4,220)
Net cash provided by (used for) financing activities	(49,317)	(514,367)
Net increase (decrease) in cash and cash equivalents and restricted deposits	(22,807)	(6,051)
Cash and cash equivalents and restricted deposits, beginning of period	116,313	100,762
Cash and cash equivalents and restricted deposits, end of period	93,506	94,711
Cash and cash equivalents	29,391	44,453
Restricted deposits	64,115	50,258
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	74,777	96,404
Net cash paid for income and other taxes	531	462
Amortization of deferred financing costs:
Other assets	603	603
Mortgage notes payable, net	416	2,084
Notes, net	1,117	992
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	736	897
Notes, net	682	635
Amortization of deferred settlements on derivative instruments:
Other liabilities	(3)	(3)
Accumulated other comprehensive income	4,393	4,791
Write-off of pursuit costs:
Investment in real estate, net	1,437	931
Other assets	11
(Income) loss from investments in unconsolidated entities:
Investments in unconsolidated entities	364	627
Other liabilities	343	350
Realized/unrealized (gain) loss on derivative instruments:
Other assets	1,337	(9,132)
Notes, net	1,255	(2,289)
Other liabilities	11,828	5,334
Accumulated other comprehensive income	(14,420)	6,087
Investments in unconsolidated entities:
Investments in unconsolidated entities	(5,561)	(2,079)
Other liabilities	(720)	(720)
Debt financing costs:
Other assets	145
Mortgage notes payable, net	(1,632)
Notes, net	(5)	(4,345)
Right-of-use assets and lease liabilities initial measurement and reclassifications:
Right-of-use assets	(438,705)
Other assets	184,116
Lease liabilities	282,791
Other liabilities	$ (28,202)
ERPOP [Member] | Mortgage Notes Payable, Net [Member]
Mortgage notes payable, net:
Net gain (loss) on debt extinguishment		$ (22,110)