Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 4,572	$ 17,865
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization, including amortization of debt issuance costs	9,202	9,118
Straight-lining of rental income	1,935	645
Change in fair value of marketable securities	11,395	(38)
Changes in operating assets and liabilities:
Tenant and other receivables, net	1,225	(1,123)
Other assets	(12,707)	13,340
Amounts due to Vornado	(597)	710
Accounts payable and accrued expenses	10,166	7,717
Other liabilities	(156)	(151)
Net cash provided by operating activities	25,035	48,083
CASH FLOWS FROM INVESTING ACTIVITIES
Construction in progress and real estate additions	(6,961)	(1,816)
Net cash used in investing activities	(6,961)	(1,816)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid	(23,034)	(23,028)
Debt issuance costs	(79)	0
Proceeds from borrowing	145,708	0
Net cash provided by (used in) financing activities	122,595	(23,028)
Net increase in cash and cash equivalents and restricted cash	140,669	23,239
Cash and cash equivalents and restricted cash at beginning of period	313,977	289,495
Cash and cash equivalents and restricted cash at end of period	454,646	312,734
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH
Cash and cash equivalents at beginning of period	298,063	283,056
Restricted cash at beginning of period	15,914	6,439
Cash and cash equivalents and restricted cash at beginning of period	313,977	289,495
Cash and cash equivalents at end of period	438,342	302,944
Restricted cash at end of period	16,304	9,790
Cash and cash equivalents and restricted cash at end of period	454,646	312,734
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash payments for interest	7,805	8,965
NON-CASH TRANSACTIONS
Liability for real estate additions, including $146 and $24 for development fees due to Vornado in 2020 and 2019, respectively	3,209	829
Write-off of fully amortized and/or depreciated assets	367	0
Lease liability arising from the recognition of right-of-use asset	0	5,428
Reclassification of prepaid real estate taxes to construction in progress for property in redevelopment	$ 0	$ 1,466