CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021		Dec. 31, 2020
Cash Flows from Operating Activities:
Net (loss) income	$ (28,197,000)	$ 2,059,000		$ (19,196,000)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	232,517,000	232,487,000		235,890,000
Straight-lining of rental revenue	(13,602,000)	(2,495,000)		(28,216,000)
Amortization of stock-based compensation expense	19,003,000	18,612,000		19,239,000
Amortization of deferred financing costs	6,156,000	9,127,000	[1]	9,277,000
Loss from unconsolidated joint ventures	53,251,000	24,896,000		18,619,000
Distributions of earnings from unconsolidated joint ventures	1,324,000	7,278,000		3,999,000
Loss recognized upon consolidation of real estate related fund investments that were previously unconsolidated	2,627,000
Loss (Income) from unconsolidated real estate related funds	1,239,000	(782,000)		(272,000)
Distributions of earnings from unconsolidated real estate related funds	1,318,000	676,000		616,000
Amortization of above and below-market leases, net	(1,748,000)	(3,070,000)		(4,734,000)
Realized and unrealized gains on marketable securities		(1,535,000)		(1,918,000)
Loss on sale of real estate related to discontinued operations				12,766,000
Other non-cash adjustments	1,188,000	3,146,000		413,000
Changes in operating assets and liabilities:
Accounts and other receivables	(8,284,000)	1,920,000		1,729,000
Deferred charges	(15,083,000)	(18,438,000)		(10,761,000)
Other assets	(7,545,000)	(8,283,000)		(2,193,000)
Accounts payable and accrued expenses	3,658,000	16,246,000		(1,299,000)
Other liabilities	(1,185,000)	(37,538,000)		3,313,000
Net cash provided by operating activities	246,637,000	244,306,000		237,272,000
Cash Flows from Investing Activities:
Additions to real estate	(125,805,000)	(112,001,000)		(89,463,000)
Due from affiliates	(59,000,000)
Repayment of amounts due from affiliates	59,000,000			36,918,000
Investment in real estate related funds	(7,454,000)
Contributions of capital to unconsolidated real estate related funds	(5,018,000)	(3,324,000)		(2,945,000)
Distributions of capital from unconsolidated real estate related funds	1,506,000	4,926,000
Investments in and contributions of capital to unconsolidated joint ventures	(15,812,000)	(11,750,000)		(60,000)
Sales of marketable securities		40,228,000		22,188,000
Purchases of marketable securities		(21,562,000)		(15,809,000)
Proceeds from the sale of real estate related to discontinued operations				89,206,000
Net cash (used in) provided by investing activities	(152,583,000)	(103,483,000)		40,035,000
Cash Flows from Financing Activities:
Dividends paid to common stockholders	(67,062,000)	(61,297,000)		(89,225,000)
Distributions paid to common unitholders	(5,962,000)	(6,182,000)		(8,837,000)
Repurchases of common shares	(63,153,000)			(120,000,000)
Distributions to noncontrolling interests	(40,699,000)	(30,539,000)		(12,717,000)
Contributions from noncontrolling interests		121,000		11,555,000
Contributions from noncontrolling interests in consolidated real estate related funds	3,257,000
Repurchase of shares related to stock compensation agreements and related tax withholdings	(284,000)	(235,000)		(332,000)
Proceeds from notes and mortgages payable		888,566,000		9,791,000
Repayment of notes and mortgages payable		(850,000,000)
Debt issuance costs		(16,775,000)
Purchase of interest rate caps		(140,000)
Repayment of borrowings under revolving credit facility				(200,000,000)
Borrowings under revolving credit facility				163,082,000
Proceeds from the sale of a 10.0% interest in 1633 Broadway				111,984,000
Repayment of note payable issued in connection with the acquisition of noncontrolling interest in consolidated real estate related fund				(8,771,000)
Net cash (used in) provided by financing activities	(173,903,000)	(76,481,000)		(143,470,000)
Net increase (decrease) in cash and cash equivalents and restricted cash	(79,849,000)	64,342,000		133,837,000
Cash and cash equivalents and restricted cash at beginning of period	529,666,000	465,324,000		331,487,000
Cash and cash equivalents and restricted cash at end of period	449,817,000	529,666,000		465,324,000
Reconciliation of Cash and Cash Equivalents and Restricted Cash:
Cash and cash equivalents at beginning of period	524,900,000	434,530,000		306,215,000
Restricted cash at beginning of period	4,766,000	30,794,000		25,272,000
Cash and cash equivalents and restricted cash at beginning of period	529,666,000	465,324,000		331,487,000
Cash and cash equivalents at end of period	408,905,000	524,900,000		434,530,000
Restricted cash at end of period	40,912,000	4,766,000		30,794,000
Cash and cash equivalents and restricted cash at end of period	449,817,000	529,666,000		465,324,000
Supplemental Disclosure of Cash Flow Information:
Cash payments for interest	139,332,000	132,476,000		135,607,000
Cash payments for income taxes, net of refunds	2,711,000	1,762,000		1,366,000
Non-Cash Transactions:
Common shares issued upon redemption of common units	128,743,000	961,000		85,710,000
Increase (decrease) due to consolidation of real estate related fund investments that were previously unconsolidated:
Real estate related fund investments	100,500,000
Investments in unconsolidated real estate related funds	(8,965,000)
Noncontrolling interests in consolidated real estate related funds	91,535,000
Change in value of interest rate swaps and interest rate caps	31,839,000	6,857,000
Dividends and distributions declared but not yet paid	18,026,000	16,895,000		16,796,000
Write-off of fully amortized and/or depreciated assets	11,386,000	46,594,000		9,141,000
Additions to real estate included in accounts payable and accrued expenses	14,595,000	12,177,000		$ 8,640,000
Transfer of deposit to investment in unconsolidated joint ventures	6,230,000	$ 6,230,000
Repurchases of common shares included in accounts payable and accrued expenses	$ 1,847,000

[1] Includes $761 of expense from the non-cash write-off of deferred financing costs in connection with the $860,000 refinancing of 1301 Avenue of the Americas in July 2021.