Consolidated Statements of Cash Flows (Unaudited) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)
Cash Flows from Operating Activities:
Net income	$ 213,044	$ 282
Adjustments to reconcile net income to net cash provided by operating activities:
Net gains on disposition of wholly owned and partially owned assets	(220,294)	0
Depreciation and amortization (including amortization of deferred financing costs)	123,135	115,337
Stock-based compensation expense	31,654	13,669
Distributions of income from partially owned entities	14,316	20,559
Equity in net (income) loss of partially owned entities	(7,320)	9,904
Amortization of below-market leases, net	(6,525)	(10,581)
Straight-lining of rents	1,140	(7,430)
(Increase) decrease in fair value of marketable securities	(461)	32,986
Net realized and unrealized (gain) loss on real estate fund investments	(100)	911
Return of capital from real estate fund investments	0	14,966
Other non-cash adjustments	1,639	1,067
Changes in operating assets and liabilities:
Real estate fund investments	(4,000)	(2,950)
Tenant and other receivables, net	(835)	(5,702)
Prepaid assets	(82,862)	77,053
Other assets	(6,044)	(15,151)
Accounts payable and accrued expenses	10,426	19,835
Other liabilities	(2,795)	663
Net cash provided by operating activities	64,118	265,418
Cash Flows from Investing Activities:
Proceeds from sale of condominium units at 220 Central Park South	425,484	0
Proceeds from sales of marketable securities	167,755	0
Development costs and construction in progress	(143,302)	(86,808)
Moynihan Train Hall expenditures	(123,533)	0
Proceeds from sale of real estate and related investment	108,512	0
Additions to real estate	(55,759)	(54,284)
Distributions of capital from partially owned entities	24,851	2,086
Investments in partially owned entities	(918)	(7,519)
Proceeds from repayments of loans receivable	204	0
Acquisitions of real estate and other	0	(44,095)
Net cash provided by (used in) investing activities	403,294	(190,620)
Cash Flows from Financing Activities:
Repayments of borrowings	(686,555)	(144,822)
Proceeds from borrowings	456,741	185,701
Dividends paid on common shares / Distributions to Vornado	(125,876)	(119,764)
Moynihan Train Hall reimbursement from Empire State Development	123,533	0
Distribution to noncontrolling interests / redeemable security holders and noncontrolling interests in consolidated subsidiaries	(16,252)	(13,266)
Dividends paid on preferred shares / Distributions to preferred unitholders	(12,534)	(16,628)
Debt issuance costs	(10,860)	(3,300)
Repurchase of shares / Class A units related to stock compensation arrangements and related tax withholdings and other	(8,692)	(784)
Contributions from noncontrolling interests / noncontrolling interests in consolidated subsidiaries	5,194	8,370
Proceeds received from exercise of employee share options and other	1,511	3,769
Redemption of preferred shares / units	(893)	(470,000)
Debt prepayment and extinguishment costs	0	(818)
Net cash used in financing activities	(274,683)	(571,542)
Net increase (decrease) in cash and cash equivalents and restricted cash	192,729	(496,744)
Cash and cash equivalents and restricted cash at beginning of period	716,905	1,914,812
Cash and cash equivalents and restricted cash at end of period	909,634	1,418,068
Reconciliation of Cash and Cash Equivalents and Restricted Cash:
Cash and cash equivalents at beginning of period	570,916	1,817,655
Restricted cash at beginning of period	145,989	97,157
Cash and cash equivalents and restricted cash at beginning of period	716,905	1,914,812
Cash and cash equivalents at end of period	307,047	1,327,384
Restricted cash at end of period	593,759	90,684
Restricted cash included in assets held for sale at end of period	8,828	0
Cash and cash equivalents and restricted cash at end of period	909,634	1,418,068
Supplemental Disclosure of Cash Flow Information:
Cash payments for interest, excluding capitalized interest of $21,371 and $13,272	85,796	84,566
Cash payments for income taxes	8,741	1,646
Reclassification of assets and related liabilities held for sale:
Assets held for sale	3,027,058	0
Liabilities related to assets held for sale	1,097,350	0
Lease liabilities arising from the recognition of right-of-use assets	526,866	0
Reclassification of condominium units from development costs and construction in progress to 220 Central Park South condominium units ready for sale	395,893	0
Accrued capital expenditures included in accounts payable and accrued expenses	77,115	51,431
Adjustments to carry redeemable Class A units at redemption value	(65,818)	114,856
Write-off of fully depreciated assets	(58,309)	(15,707)
Amounts related to our investment in Pennsylvania Real Estate Investment Trust reclassified from investments in partially owned entities and accumulated other comprehensive income to marketable securities upon conversion of operating partnership units to common shares	54,962	0
Vornado Realty L.P.
Cash Flows from Operating Activities:
Net income	213,044	282
Adjustments to reconcile net income to net cash provided by operating activities:
Net gains on disposition of wholly owned and partially owned assets	(220,294)	0
Depreciation and amortization (including amortization of deferred financing costs)	123,135	115,337
Stock-based compensation expense	31,654	13,669
Distributions of income from partially owned entities	14,316	20,559
Equity in net (income) loss of partially owned entities	(7,320)	9,904
Amortization of below-market leases, net	(6,525)	(10,581)
Straight-lining of rents	1,140	(7,430)
(Increase) decrease in fair value of marketable securities	(461)	32,986
Net realized and unrealized (gain) loss on real estate fund investments	(100)	911
Return of capital from real estate fund investments	0	14,966
Other non-cash adjustments	1,639	1,067
Changes in operating assets and liabilities:
Real estate fund investments	(4,000)	(2,950)
Tenant and other receivables, net	(835)	(5,702)
Prepaid assets	(82,862)	77,053
Other assets	(6,044)	(15,151)
Accounts payable and accrued expenses	10,426	19,835
Other liabilities	(2,795)	663
Net cash provided by operating activities	64,118	265,418
Cash Flows from Investing Activities:
Proceeds from sale of condominium units at 220 Central Park South	425,484	0
Proceeds from sales of marketable securities	167,755	0
Development costs and construction in progress	(143,302)	(86,808)
Moynihan Train Hall expenditures	(123,533)	0
Proceeds from sale of real estate and related investment	108,512	0
Additions to real estate	(55,759)	(54,284)
Distributions of capital from partially owned entities	24,851	2,086
Investments in partially owned entities	(918)	(7,519)
Proceeds from repayments of loans receivable	204	0
Acquisitions of real estate and other	0	(44,095)
Net cash provided by (used in) investing activities	403,294	(190,620)
Cash Flows from Financing Activities:
Repayments of borrowings	(686,555)	(144,822)
Proceeds from borrowings	456,741	185,701
Dividends paid on common shares / Distributions to Vornado	(125,876)	(119,764)
Moynihan Train Hall reimbursement from Empire State Development	123,533	0
Distribution to noncontrolling interests / redeemable security holders and noncontrolling interests in consolidated subsidiaries	(16,252)	(13,266)
Dividends paid on preferred shares / Distributions to preferred unitholders	(12,534)	(16,628)
Debt issuance costs	(10,860)	(3,300)
Repurchase of shares / Class A units related to stock compensation arrangements and related tax withholdings and other	(8,692)	(784)
Contributions from noncontrolling interests / noncontrolling interests in consolidated subsidiaries	5,194	8,370
Proceeds received from exercise of employee share options and other	1,511	3,769
Redemption of preferred shares / units	(893)	(470,000)
Debt prepayment and extinguishment costs	0	(818)
Net cash used in financing activities	(274,683)	(571,542)
Net increase (decrease) in cash and cash equivalents and restricted cash	192,729	(496,744)
Cash and cash equivalents and restricted cash at beginning of period	716,905	1,914,812
Cash and cash equivalents and restricted cash at end of period	909,634	1,418,068
Reconciliation of Cash and Cash Equivalents and Restricted Cash:
Cash and cash equivalents at beginning of period	570,916	1,817,655
Restricted cash at beginning of period	145,989	97,157
Cash and cash equivalents and restricted cash at beginning of period	716,905	1,914,812
Cash and cash equivalents at end of period	307,047	1,327,384
Restricted cash at end of period	593,759	90,684
Restricted cash included in assets held for sale at end of period	8,828	0
Cash and cash equivalents and restricted cash at end of period	909,634	1,418,068
Supplemental Disclosure of Cash Flow Information:
Cash payments for interest, excluding capitalized interest of $21,371 and $13,272	85,796	84,566
Cash payments for income taxes	8,741	1,646
Reclassification of assets and related liabilities held for sale:
Assets held for sale	3,027,058	0
Liabilities related to assets held for sale	1,097,350	0
Lease liabilities arising from the recognition of right-of-use assets	526,866	0
Reclassification of condominium units from development costs and construction in progress to 220 Central Park South condominium units ready for sale	395,893	0
Accrued capital expenditures included in accounts payable and accrued expenses	77,115	51,431
Adjustments to carry redeemable Class A units at redemption value	(65,818)	114,856
Write-off of fully depreciated assets	(58,309)	(15,707)
Amounts related to our investment in Pennsylvania Real Estate Investment Trust reclassified from investments in partially owned entities and accumulated other comprehensive income to marketable securities upon conversion of operating partnership units to common shares	$ 54,962	$ 0