Veris Residential (VRE) 10-K 25 Feb 21 2020 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2020	Feb. 23, 2021	Jun. 30, 2020
Document Type	10-K
Amendment Flag	false
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2020
Entity Central Index Key	0000924901
Current Fiscal Year End Date	--12-31
Entity Registrant Name	MACK-CALI REALTY CORPORATION
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Public Float			$ 1,314,998,454
Entity File Number	1-13274
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	22-3305147
Entity Address, Address Line One	Harborside 3, 210 Hudson St.
Entity Address, Address Line Two	Ste. 400
Entity Address, City or Town	Jersey City
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	07311
City Area Code	732
Local Phone Number	590-1010
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	CLI
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		90,729,044
ICFR Auditor Attestation Flag	true
Documents incorporated by reference	DOCUMENTS INCORPORATED BY REFERENCE: Portions of the Mack-Cali Realty Corporation’s definitive proxy statement for fiscal year ended December 31, 2020 to be issued in conjunction with the registrant’s annual meeting of shareholders expected to be held on June 9, 2021 are incorporated by reference in Part III of this Form 10-K. The definitive proxy statement will be filed by the registrant with the SEC not later than 120 days from the end of the registrant’s fiscal year ended December 31, 2020.
Mack-Cali Realty LP [Member]
Entity Registrant Name	MACK-CALI REALTY, L.P.
Entity File Number	333-57103

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Rental property
Land and leasehold interests	$ 639,636	$ 653,231
Buildings and improvements	3,743,831	3,361,435
Tenant improvements	171,623	163,299
Furniture, fixtures and equipment	83,553	78,716
Gross investment in rental property	4,638,643	4,256,681
Less - accumulated depreciation and amortization	(656,331)	(558,617)
Total investment in rental property	3,982,312	3,698,064
Real estate held for sale, net	656,963	966,497
Net investment in rental property	4,639,275	4,664,561
Cash and cash equivalents	38,096	25,589
Restricted cash	14,207	15,577
Investments in unconsolidated joint ventures	162,382	209,091
Unbilled rents receivable, net	84,907	95,686
Deferred charges, goodwill and other assets, net	199,541	275,102
Accounts receivable	9,378	7,192
Total assets	5,147,786	5,292,798
LIABILITIES AND EQUITY
Senior unsecured notes, net	572,653	571,484
Unsecured revolving credit facility and term loans	25,000	329,000
Mortgages, loans payable and other obligations, net	2,204,144	1,908,034
Dividends and distributions payable	1,493	22,265
Accounts payable, accrued expenses and other liabilities	194,717	209,510
Rents received in advance and security deposits	34,101	39,463
Accrued interest payable	10,001	10,185
Total liabilities	3,042,109	3,089,941
Commitments and contingencies
Redeemable noncontrolling interests	513,297	503,382
Mack-Cali Realty Corporation stockholders' equity:
Common stock, $0.01 par value, 190,000,000 shares authorized, 90,712,417 and 90,595,176 shares outstanding	907	906
Additional paid-in capital	2,528,187	2,535,440
Dividends in excess of net earnings	(1,130,277)	(1,042,629)
Accumulated other comprehensive income (loss)		(18)
Total Mack-Cali Realty Corporation stockholders' equity	1,398,817	1,493,699
Noncontrolling interests in subsidiaries:
Operating Partnership	148,791	158,480
Consolidated joint ventures	44,772	47,296
Total noncontrolling interests in subsidiaries	193,563	205,776
Total equity	1,592,380	1,699,475
Total liabilities and equity	5,147,786	5,292,798
Mack-Cali Realty LP [Member]
Rental property
Land and leasehold interests	639,636	653,231
Buildings and improvements	3,743,831	3,361,435
Tenant improvements	171,623	163,299
Furniture, fixtures and equipment	83,553	78,716
Gross investment in rental property	4,638,643	4,256,681
Less - accumulated depreciation and amortization	(656,331)	(558,617)
Total investment in rental property	3,982,312	3,698,064
Real estate held for sale, net	656,963	966,497
Net investment in rental property	4,639,275	4,664,561
Cash and cash equivalents	38,096	25,589
Restricted cash	14,207	15,577
Investments in unconsolidated joint ventures	162,382	209,091
Unbilled rents receivable, net	84,907	95,686
Deferred charges, goodwill and other assets, net	199,541	275,102
Accounts receivable	9,378	7,192
Total assets	5,147,786	5,292,798
LIABILITIES AND EQUITY
Senior unsecured notes, net	572,653	571,484
Unsecured revolving credit facility and term loans	25,000	329,000
Mortgages, loans payable and other obligations, net	2,204,144	1,908,034
Dividends and distributions payable	1,493	22,265
Accounts payable, accrued expenses and other liabilities	194,717	209,510
Rents received in advance and security deposits	34,101	39,463
Accrued interest payable	10,001	10,185
Total liabilities	3,042,109	3,089,941
Commitments and contingencies
Redeemable noncontrolling interests	513,297	503,382
Mack-Cali Realty Corporation stockholders' equity:
General Partner, 90,712,417 and 90,595,176 common units outstanding	1,330,048	1,427,568
Limited partners, 9,649,031 and 9,612,064 common units/LTIPs outstanding	217,560	224,629
Accumulated other comprehensive income (loss)		(18)
Total Mack-Cali Realty, L.P. partners' capital	1,547,608	1,652,179
Noncontrolling interests in subsidiaries:
Noncontrolling interests in consolidated joint ventures	44,772	47,296
Total equity	1,592,380	1,699,475
Total liabilities and equity	$ 5,147,786	$ 5,292,798

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2020	Dec. 31, 2019
Common stock, par value per share	$ 0.01	$ 0.01
Common stock, shares authorized	190,000,000	190,000,000
Common stock, shares outstanding	90,712,417	90,595,176
Mack-Cali Realty LP [Member]
General Partner common units outstanding	90,712,417	90,595,176
Limited partners common units outstanding	9,649,031	9,612,064

Consolidated Statements Of Oper

Consolidated Statements Of Operations - USD ($) shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
REVENUES
Revenue from leases	$ 272,970,000	$ 302,409,000	$ 323,793,000
Total revenues	313,562,000	357,202,000	371,724,000
EXPENSES
Real estate taxes	45,825,000	44,817,000	45,178,000
Utilities	13,717,000	17,881,000	23,799,000
Operating services	68,313,000	70,409,000	70,849,000
Real estate services expenses	13,555,000	15,918,000	17,919,000
General and administrative	73,641,000	59,805,000	53,869,000
Depreciation and amortization	122,035,000	133,597,000	113,817,000
Property impairments	36,582,000
Land and other impairments	16,817,000	32,444,000	24,566,000
Total expenses	390,485,000	374,871,000	349,997,000
OTHER (EXPENSE) INCOME
Interest expense	(80,991,000)	(90,569,000)	(77,594,000)
Interest and other investment income (loss)	43,000	2,412,000	3,220,000
Equity in earnings (loss) of unconsolidated joint ventures	(3,832,000)	(1,319,000)	(127,000)
Gain on change of control of interests		13,790,000	14,217,000
Realized gains (losses) and unrealized losses on disposition of rental property, net	5,481,000	343,102,000	99,436,000
Gain on disposition of developable land	5,787,000	522,000	30,939,000
Gain on sale from unconsolidated joint ventures	35,184,000	903,000
Gain (loss) from extinguishment of debt, net	(272,000)	1,648,000	(8,994,000)
Total other income (expense)	(38,600,000)	270,489,000	61,097,000
Net income (loss) from continuing operations	(115,523,000)	252,820,000	82,824,000
Discontinued operations:
Income from discontinued operations	70,724,000	24,366,000	23,577,000
Realized gains (losses) and unrealized losses on disposition of rental property and impairments, net	11,201,000	(133,350,000)
Total discontinued operations, net	81,925,000	(108,984,000)	23,577,000
Net income (loss)	(33,598,000)	143,836,000	106,401,000
Noncontrolling interests in consolidated joint ventures	2,695,000	3,904,000	1,216,000
Noncontrolling interests in Operating Partnership of income from continuing operations	13,279,000	(23,720,000)	(7,127,000)
Noncontrolling interests in Operating Partnership in discontinued operations	(7,880,000)	10,456,000	(2,400,000)
Redeemable noncontrolling interests	(25,883,000)	(22,615,000)	(13,979,000)
Net income (loss) available to common shareholders	$ (51,387,000)	$ 111,861,000	$ 84,111,000
Basic earnings per common share:
Income (loss) from continuing operations	$ (1.51)	$ 2.04	$ 0.57
Discontinued operations	0.81	(1.09)	0.23
Net income (loss) available to common shareholders	(0.70)	0.95	0.80
Diluted earnings per common share:
Income (loss) from continuing operations	(1.51)	2.04	0.57
Discontinued operations	0.81	(1.09)	0.23
Net income (loss) available to common shareholders	$ (0.70)	$ 0.95	$ 0.80
Basic weighted average shares outstanding	90,648	90,557	90,388
Diluted weighted average shares outstanding	100,260	100,689	100,724
Real Estate Services [Member]
REVENUES
Total revenues	$ 11,390,000	$ 13,873,000	$ 17,094,000
Parking Income [Member]
REVENUES
Total revenues	15,604,000	21,857,000	21,907,000
Hotel [Member]
REVENUES
Total revenues	4,287,000	9,841,000
Other Income [Member]
REVENUES
Total revenues	9,311,000	9,222,000	8,930,000
Mack-Cali Realty LP [Member]
REVENUES
Revenue from leases	272,970,000	302,409,000	323,793,000
Total revenues	313,562,000	357,202,000	371,724,000
EXPENSES
Real estate taxes	45,825,000	44,817,000	45,178,000
Utilities	13,717,000	17,881,000	23,799,000
Operating services	68,313,000	70,409,000	70,849,000
Real estate services expenses	13,555,000	15,918,000	17,919,000
General and administrative	73,641,000	59,805,000	53,869,000
Depreciation and amortization	122,035,000	133,597,000	113,817,000
Property impairments	36,582,000
Land and other impairments	16,817,000	32,444,000	24,566,000
Total expenses	390,485,000	374,871,000	349,997,000
OTHER (EXPENSE) INCOME
Interest expense	(80,991,000)	(90,569,000)	(77,594,000)
Interest and other investment income (loss)	43,000	2,412,000	3,220,000
Equity in earnings (loss) of unconsolidated joint ventures	(3,832,000)	(1,319,000)	(127,000)
Gain on change of control of interests		13,790,000	14,217,000
Realized gains (losses) and unrealized losses on disposition of rental property, net	5,481,000	343,102,000	99,436,000
Gain on disposition of developable land	5,787,000	522,000	30,939,000
Gain on sale from unconsolidated joint ventures	35,184,000	903,000
Gain (loss) from extinguishment of debt, net	(272,000)	1,648,000	(8,994,000)
Total other income (expense)	(38,600,000)	270,489,000	61,097,000
Net income (loss) from continuing operations	(115,523,000)	252,820,000	82,824,000
Discontinued operations:
Income from discontinued operations	70,724,000	24,366,000	23,577,000
Realized gains (losses) and unrealized losses on disposition of rental property and impairments, net	11,201,000	(133,350,000)
Total discontinued operations, net	81,925,000	(108,984,000)	23,577,000
Net income (loss)	(33,598,000)	143,836,000	106,401,000
Noncontrolling interests in consolidated joint ventures	2,695,000	3,904,000	1,216,000
Redeemable noncontrolling interests	(25,883,000)	(22,615,000)	(13,979,000)
Net income (loss) available to common shareholders	$ (56,786,000)	$ 125,125,000	$ 93,638,000
Basic earnings per common share:
Income (loss) from continuing operations	$ (1.51)	$ 2.04	$ 0.57
Discontinued operations	0.81	(1.09)	0.23
Net income (loss) available to common shareholders	(0.70)	0.95	0.80
Diluted earnings per common share:
Income (loss) from continuing operations	(1.51)	2.04	0.57
Discontinued operations	0.81	(1.09)	0.23
Net income (loss) available to common shareholders	$ (0.70)	$ 0.95	$ 0.80
Basic weighted average units outstanding	100,260	100,520	100,634
Diluted weighted average units outstanding	100,260	100,689	100,724
Mack-Cali Realty LP [Member] | Real Estate Services [Member]
REVENUES
Total revenues	$ 11,390,000	$ 13,873,000	$ 17,094,000
Mack-Cali Realty LP [Member] | Parking Income [Member]
REVENUES
Total revenues	15,604,000	21,857,000	21,907,000
Mack-Cali Realty LP [Member] | Hotel [Member]
REVENUES
Total revenues	4,287,000	9,841,000
Mack-Cali Realty LP [Member] | Other Income [Member]
REVENUES
Total revenues	$ 9,311,000	$ 9,222,000	$ 8,930,000

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net income (loss)	$ (33,598,000)	$ 143,836,000	$ 106,401,000
Other comprehensive income (loss):
Net unrealized gain (loss) on derivative instruments for interest rate swaps	(16,000)	(10,158,000)	2,318,000
Comprehensive income (loss)	(33,614,000)	133,678,000	108,719,000
Comprehensive (income) loss attributable to noncontrolling interests in consolidated joint ventures	2,695,000	3,904,000	1,216,000
Comprehensive (income) loss attributable to redeemable noncontrolling interests	(25,883,000)	(22,615,000)	(13,979,000)
Comprehensive (income) loss attributable to noncontrolling interests in Operating Partnership	5,433,000	(12,284,000)	(9,764,000)
Comprehensive income (loss) attributable to common shareholders	(51,369,000)	102,683,000	86,192,000
Mack-Cali Realty LP [Member]
Net income (loss)	(33,598,000)	143,836,000	106,401,000
Other comprehensive income (loss):
Net unrealized gain (loss) on derivative instruments for interest rate swaps	(16,000)	(10,158,000)	2,318,000
Comprehensive income (loss)	(33,614,000)	133,678,000	108,719,000
Comprehensive (income) loss attributable to noncontrolling interests in consolidated joint ventures	2,695,000	3,904,000	1,216,000
Comprehensive (income) loss attributable to noncontrolling interests in Operating Partnership	(25,883,000)	(22,615,000)	(13,979,000)
Comprehensive income (loss) attributable to common shareholders	$ (56,802,000)	$ 114,967,000	$ 95,956,000

Consolidated Statements Of Chan

Consolidated Statements Of Changes In Equity - USD ($) shares in Thousands, $ in Thousands	Mack-Cali Realty LP [Member]General Partner Common Units [Member]	Mack-Cali Realty LP [Member]Limited Partner Common Units/Vested LTIP Units [Member]	Mack-Cali Realty LP [Member]General Partner Common Unitholders [Member]	Mack-Cali Realty LP [Member]Limited Partner Common Unitholders [Member]	Mack-Cali Realty LP [Member]Noncontrolling Interest In Consolidated Joint Ventures [Member]	Mack-Cali Realty LP [Member]Accumulated Other Comprehensive Income (Loss) [Member]	Mack-Cali Realty LP [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Dividends In Excess Of Net Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests In Subsidiaries [Member]	Total
Balance, value at Dec. 31, 2017								$ 899	$ 2,565,136	$ (1,096,429)	$ 6,689	$ 192,428	$ 1,668,723
Balance, shares at Dec. 31, 2017								89,914
Balance, value at Dec. 31, 2017			$ 1,407,366	$ 233,635	$ 21,033	$ 6,689	$ 1,668,723
Balance, units at Dec. 31, 2017	89,914	10,438
Net income (loss)			84,111	9,527	12,763		106,401			84,111		22,290	106,401
Common stock dividends										(72,200)			(72,200)
Common unit distributions			(72,200)	(9,022)			(81,222)					(9,022)	(9,022)
Redeemable noncontrolling interests			(11,425)	(1,296)	(13,979)		(26,700)		(11,425)			(15,275)	(26,700)
Change in noncontrolling interests in consolidated joint ventures					22,333		22,333					22,333	22,333
Vested LTIP units, shares		55
Redemption of common units for common stock, value			4,344	(4,344)				$ 3	4,341			(4,344)
Redemption of common units for common stock, shares	264	(264)						264
Shares issued under Dividend Reinvestment and Stock Purchase Plan, shares	4							4
Shares issued under Dividend Reinvestment and Stock Purchase Plan, value			(37)				(37)		(37)				(37)
Directors' deferred compensation plan, value			507				507		507				507
Stock compensation, value			1,414	5,480			6,894	$ 1	1,413			5,480	6,894
Stock compensation, shares	147							147
Cancellation of restricted shares, value			(583)	(1,453)			(2,036)		(583)			(1,453)	(2,036)
Cancellation of restricted shares, shares	(9)							(9)
Other comprehensive income (loss)				237		2,081	2,318				2,081	237	2,318
Rebalancing of ownership percentage between parent and subsidiaries									2,151			(2,151)
Balance, value at Dec. 31, 2018								$ 903	2,561,503	(1,084,518)	8,770	210,523	1,697,181
Balance, shares at Dec. 31, 2018								90,320
Balance, value at Dec. 31, 2018			1,413,497	232,764	42,150	8,770	1,697,181
Balance, units at Dec. 31, 2018	90,320	10,229
Net income (loss)			111,861	13,264	18,711		143,836			111,861		31,975	143,836
Common stock dividends										(72,401)			(72,401)
Common unit distributions			(72,401)	(8,705)			(81,106)					(8,705)	(8,705)
Redeemable noncontrolling interests			(25,885)	(2,855)	(22,615)		(51,355)		(25,885)			(25,470)	(51,355)
Change in noncontrolling interests in consolidated joint ventures			(1,958)		9,050		7,092		(1,958)			9,050	7,092
Vested LTIP units, shares		68
Redemption of common units for common stock, value			705	(705)				$ 1	704			(705)
Redemption of common units for common stock, shares	38	(20)						38
Redemption of common units, value			(1,665)	(12,799)			(14,464)		(1,665)			(12,799)	(14,464)
Redemption of common units, shares		(665)
Shares issued under Dividend Reinvestment and Stock Purchase Plan, value			39				39		39				39
Shares issued under Dividend Reinvestment and Stock Purchase Plan, shares	2							2
Directors' deferred compensation plan, value			319				319	$ 2	317				319
Directors' deferred compensation plan, shares	194							194
Stock compensation, value			627	7,534			8,161		627			7,534	8,161
Stock compensation, shares	41							41
Cancellation of restricted shares, value			2,819	(2,889)			(70)			2,819		(2,889)	(70)
Other comprehensive income (loss)			(390)	(980)		(8,788)	(10,158)			(390)	(8,788)	(980)	(10,158)
Rebalancing of ownership percentage between parent and subsidiaries									1,758			(1,758)
Balance, value at Dec. 31, 2019								$ 906	2,535,440	(1,042,629)	(18)	205,776	1,699,475
Balance, shares at Dec. 31, 2019								90,595
Balance, value at Dec. 31, 2019			1,427,568	224,629	47,296	(18)	1,699,475
Balance, units at Dec. 31, 2019	90,595	9,612
Net income (loss)			(51,387)	(5,399)	23,188		(33,598)			(51,387)		17,789	(33,598)
Common stock dividends										(36,261)			(36,261)
Common unit distributions			(36,261)	(3,509)			(39,770)					(3,509)	(3,509)
Redeemable noncontrolling interests			(11,814)	(1,254)	(25,883)		(38,951)		(11,814)			(27,137)	(38,951)
Change in noncontrolling interests in consolidated joint ventures					171		171					171	171
Vested LTIP units, shares		175
Redemption of common units for common stock, value				(2,693)			(2,693)
Redemption of common units for common stock, shares		(138)
Redemption of common units, value												(2,693)	(2,693)
Shares issued under Dividend Reinvestment and Stock Purchase Plan, value			37				37		37				37
Shares issued under Dividend Reinvestment and Stock Purchase Plan, shares	3							3
Directors' deferred compensation plan, value			291				291	$ 1	290				291
Directors' deferred compensation plan, shares	61							61
Stock compensation, value			1,614	6,021			7,635		1,614			6,021	7,635
Stock compensation, shares	53							53
Cancellation of restricted shares, value				(201)			(201)					(201)	(201)
Other comprehensive income (loss)				(34)		$ 18	(16)				$ 18	(34)	(16)
Rebalancing of ownership percentage between parent and subsidiaries									2,620			(2,620)
Balance, value at Dec. 31, 2020								$ 907	$ 2,528,187	$ (1,130,277)		$ 193,563	$ 1,592,380
Balance, shares at Dec. 31, 2020								90,712
Balance, value at Dec. 31, 2020			$ 1,330,048	$ 217,560	$ 44,772		$ 1,592,380
Balance, units at Dec. 31, 2020	90,712	9,649

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($)		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)		$ (33,598,000)		$ 143,836,000		$ 106,401,000
Net (income) loss from discontinued operations		(81,925,000)		108,984,000		(23,577,000)
Net income (loss) from continuing operations		(115,523,000)		252,820,000		82,824,000
Adjustments to reconcile net income (loss) to net cash provided by Operating activities:
Depreciation and amortization, including related intangible assets		118,345,000		129,725,000		109,352,000
Amortization of directors deferred compensation stock units		291,000		319,000		507,000
Amortization of stock compensation		7,635,000		8,161,000		6,894,000
Amortization of deferred financing costs		4,625,000		4,625,000		5,028,000
Amortization of debt discount and mark-to-market		(1,083,000)		(949,000)		(948,000)
Equity in (earnings) loss of unconsolidated joint ventures		3,832,000		1,319,000		127,000
Distributions of cumulative earnings from unconsolidated joint ventures		5,300,000		6,923,000		9,182,000
Gain on change of control of interests				(13,790,000)		(14,217,000)
Realized (gains) losses and unrealized losses on disposition of rental property, net		(5,481,000)		(343,102,000)		(99,436,000)
Gain on disposition of developable land		(5,787,000)		(522,000)		(30,939,000)
Property impairments on continuing operations		36,582,000
Land and other impairments		16,817,000		32,444,000		24,566,000
Gain on sale from in unconsolidated joint ventures		(35,184,000)		(903,000)
(Gain)Loss from extinguishment of debt		272,000		(1,648,000)		10,750,000
Changes in operating assets and liabilities:
Increase in unbilled rents receivable, net		(1,135,000)		(7,240,000)		(7,627,000)
Increase in deferred charges, goodwill and other assets		(806,000)		(21,921,000)		(23,389,000)
(Increase) decrease in accounts receivable, net		(5,117,000)		2,132,000		871,000
Increase (decrease) in accounts payable, accrued expenses and other liabilities		(9,577,000)		1,820,000		12,567,000
(Decrease) Increase in rents received in advance and security deposits		(2,446,000)		2,002,000		736,000
(Decrease) increase in accrued interest payable		(184,000)		1,068,000		(157,000)
Net cash flows provided by operating activities - continuing operations		11,376,000		53,283,000		86,691,000
Net cash flows provided by operating activities - discontinuing operations		74,046,000		78,559,000		80,382,000
Net cash provided by operating activities		85,422,000		131,842,000		167,073,000
CASH FLOWS FROM INVESTING ACTIVITIES
Rental property acquisitions and related intangibles		(16,811,000)		(956,040,000)		(164,838,000)
Rental property additions and improvements		(138,688,000)		(88,240,000)		(113,523,000)
Development of rental property and other related costs		(295,892,000)		(172,309,000)		(184,764,000)
Proceeds from the sales of rental property		64,947,000		825,613,000		338,015,000
Proceeds from the sale of investments in unconsolidated joint ventures		64,773,000		4,039,000
Repayment of notes receivable		458,000		46,597,000		12,102,000
Investment in unconsolidated joint ventures		(2,959,000)		(9,011,000)		(11,789,000)
Distributions in excess of cumulative earnings from unconsolidated joint ventures		13,826,000		8,697,000		11,553,000
Net cash used in investing activities - continuing operations		(310,346,000)		(340,654,000)		(113,244,000)
Net cash provided by (used in) investing activities - discontinuing operations		338,811,000		(75,421,000)		(54,910,000)
Net cash provided by (used in) investing activities		28,465,000		(416,075,000)		(168,154,000)
CASH FLOW FROM FINANCING ACTIVITIES
Borrowings from revolving credit facility		212,000,000		829,000,000		461,000,000
Repayment of revolving credit facility		(516,000,000)		(617,000,000)		(494,000,000)
Repayment of unsecured term loan				(675,000,000)
Proceeds from mortgages and loans payable		381,577,000		877,126,000		434,293,000
Repayment of mortgages, loans payable and other obligations		(86,561,000)		(155,115,000)		(418,495,000)
Acquisition of noncontrolling interests				(5,017,000)
(Redemption) issuance of redeemable noncontrolling interests, net		(3,153,000)		145,000,000		105,000,000
Common unit redemptions		(2,693,000)		(7,769,000)
Payment of financing costs		(1,677,000)		(12,339,000)		(3,576,000)
(Contributions) distributions to noncontrolling interests		171,000		(466,000)		(7,542,000)
Distributions to redeemable noncontrolling interests		(25,883,000)		(21,883,000)		(13,449,000)
Payment of dividends and distributions		(60,532,000)		(80,692,000)		(80,568,000)
Net cash (used in) provided by financing activities		(102,751,000)		275,845,000		(17,337,000)
Net increase (decrease) in cash and cash equivalents		11,136,000		(8,388,000)		(18,418,000)
Cash, cash equivalents and restricted cash, beginning of period	[2]	41,166,000	[1]	49,554,000	[1]	67,972,000
Cash, cash equivalents and restricted cash, end of period	[1]	52,302,000		41,166,000	[2]	49,554,000	[2]
Mack-Cali Realty LP [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)		(33,598,000)		143,836,000		106,401,000
Net (income) loss from discontinued operations		(81,925,000)		108,984,000		(23,577,000)
Net income (loss) from continuing operations		(115,523,000)		252,820,000		82,824,000
Adjustments to reconcile net income (loss) to net cash provided by Operating activities:
Depreciation and amortization, including related intangible assets		118,345,000		129,725,000		109,352,000
Amortization of directors deferred compensation stock units		291,000		319,000		507,000
Amortization of stock compensation		7,635,000		8,161,000		6,894,000
Amortization of deferred financing costs		4,625,000		4,625,000		5,028,000
Amortization of debt discount and mark-to-market		(1,083,000)		(949,000)		(948,000)
Equity in (earnings) loss of unconsolidated joint ventures		3,832,000		1,319,000		127,000
Distributions of cumulative earnings from unconsolidated joint ventures		5,300,000		6,923,000		9,182,000
Gain on change of control of interests				(13,790,000)		(14,217,000)
Realized (gains) losses and unrealized losses on disposition of rental property, net		(5,481,000)		(343,102,000)		(99,436,000)
Gain on disposition of developable land		(5,787,000)		(522,000)		(30,939,000)
Property impairments on continuing operations		36,582,000
Land and other impairments		16,817,000		32,444,000		24,566,000
Gain on sale from in unconsolidated joint ventures		(35,184,000)		(903,000)
(Gain)Loss from extinguishment of debt		272,000		(1,648,000)		10,750,000
Changes in operating assets and liabilities:
Increase in unbilled rents receivable, net		(1,135,000)		(7,240,000)		(7,627,000)
Increase in deferred charges, goodwill and other assets		(806,000)		(21,921,000)		(23,389,000)
(Increase) decrease in accounts receivable, net		(5,117,000)		2,132,000		871,000
Increase (decrease) in accounts payable, accrued expenses and other liabilities		(9,577,000)		1,820,000		12,567,000
(Decrease) Increase in rents received in advance and security deposits		(2,446,000)		2,002,000		736,000
(Decrease) increase in accrued interest payable		(184,000)		1,068,000		(157,000)
Net cash flows provided by operating activities - continuing operations		11,376,000		53,283,000		86,691,000
Net cash flows provided by operating activities - discontinuing operations		74,046,000		78,559,000		80,382,000
Net cash provided by operating activities		85,422,000		131,842,000		167,073,000
CASH FLOWS FROM INVESTING ACTIVITIES
Rental property acquisitions and related intangibles		(16,811,000)		(956,040,000)		(164,838,000)
Rental property additions and improvements		(138,688,000)		(88,240,000)		(113,523,000)
Development of rental property and other related costs		(295,892,000)		(172,309,000)		(184,764,000)
Proceeds from the sales of rental property		64,947,000		825,613,000		338,015,000
Proceeds from the sale of investments in unconsolidated joint ventures		64,773,000		4,039,000
Repayment of notes receivable		458,000		46,597,000		12,102,000
Investment in unconsolidated joint ventures		(2,959,000)		(9,011,000)		(11,789,000)
Distributions in excess of cumulative earnings from unconsolidated joint ventures		13,826,000		8,697,000		11,553,000
Net cash used in investing activities - continuing operations		(310,346,000)		(340,654,000)		(113,244,000)
Net cash provided by (used in) investing activities - discontinuing operations		338,811,000		(75,421,000)		(54,910,000)
Net cash provided by (used in) investing activities		28,465,000		(416,075,000)		(168,154,000)
CASH FLOW FROM FINANCING ACTIVITIES
Borrowings from revolving credit facility		212,000,000		829,000,000		461,000,000
Repayment of revolving credit facility		(516,000,000)		(617,000,000)		(494,000,000)
Repayment of unsecured term loan				(675,000,000)
Proceeds from mortgages and loans payable		381,577,000		877,126,000		434,293,000
Repayment of mortgages, loans payable and other obligations		(86,561,000)		(155,115,000)		(418,495,000)
Acquisition of noncontrolling interests				(5,017,000)
(Redemption) issuance of redeemable noncontrolling interests, net		(3,153,000)		145,000,000		105,000,000
Common unit redemptions		(2,693,000)		(7,769,000)
Payment of financing costs		(1,677,000)		(12,339,000)		(3,576,000)
(Contributions) distributions to noncontrolling interests		171,000		(466,000)		(7,542,000)
Distributions to redeemable noncontrolling interests		(25,883,000)		(21,883,000)		(13,449,000)
Payment of dividends and distributions		(60,532,000)		(80,692,000)		(80,568,000)
Net cash (used in) provided by financing activities		(102,751,000)		275,845,000		(17,337,000)
Net increase (decrease) in cash and cash equivalents		11,136,000		(8,388,000)		(18,418,000)
Cash, cash equivalents and restricted cash, beginning of period	[2]	41,166,000	[1]	49,554,000	[1]	67,972,000
Cash, cash equivalents and restricted cash, end of period	[1]	$ 52,302,000		$ 41,166,000	[2]	$ 49,554,000	[2]
[1]	Includes Restricted Cash of $ 14,207 , $ 15,577 and $ 19,921 as of December 31, 2020, 2019 and 2018, respectively, pursuant to the adoption of ASU 2016-15.
[2]	Includes Restricted Cash of $ 15,577 , $ 19,921 and $ 39,792 as of December 31, 2019, 2018 and 2017, respectively, pursuant to the adoption of ASU 2016-15.

Consolidated Statements Of Ca_2

Consolidated Statements Of Cash Flows (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restricted cash	$ 14,207	$ 15,577	$ 19,921	$ 39,792
Mack-Cali Realty LP [Member]
Restricted cash	$ 14,207	$ 15,577	$ 19,921	$ 39,792

Organization And Basis Of Prese

Organization And Basis Of Presentation	12 Months Ended
	Dec. 31, 2020
Organization And Basis Of Presentation [Line Items]
Organization And Basis Of Presentation	1. ORGANIZATION AND BASIS OF PRESENTATION Organization Mack-Cali Realty Corporation, a Maryland corporation, together with its subsidiaries (collectively, the “General Partner”), is a fully-integrated, self-administered, self-managed real estate investment trust (“REIT”). The General Partner controls Mack-Cali Realty, L.P., a Delaware limited partnership, together with its subsidiaries (collectively, the “Operating Partnership”), as its sole general partner and owned a 90.4 percent common unit interest in the Operating Partnership as of December 31, 2020 and 2019, respectively. The General Partner’s business is the ownership of interests in and operation of the Operating Partnership and all of the General Partner’s expenses are incurred for the benefit of the Operating Partnership. The General Partner is reimbursed by the Operating Partnership for all expenses it incurs relating to the ownership and operation of the Operating Partnership. The Operating Partnership conducts the business of providing leasing, management, acquisition, development and tenant-related services for its General Partner. The Operating Partnership, through its operating divisions and subsidiaries, including the Mack-Cali property-owning partnerships and limited liability companies, is the entity through which all of the General Partner’s operations are conducted. Unless stated otherwise or the context requires, the “Company” refers to the General Partner and its subsidiaries, including the Operating Partnership and its subsidiaries. As of December 31, 2020, the Company owned or had interests in 52 properties (the “Properties”). The Properties are comprised of 25 office buildings totaling approximately 8.1 million square feet and leased to approximately 225 tenants (which include two buildings aggregating approximately 0.2 million square feet owned by unconsolidated joint ventures in which the Company has investment interests), 19 multi-family properties totaling 5,825 apartment units (which include six properties aggregating 1,786 apartment units owned by unconsolidated joint ventures in which the Company has investment interests), four parking/retail properties totaling approximately 108,000 square feet (which include a building aggregating 51,000 square feet owned by unconsolidated joint ventures in which the Company has investment interests), three hotels containing 723 rooms (one of which is owned by an unconsolidated joint venture in which the Company has an investment interest) and a parcel of land leased to a third party. The Properties are located in three states in the Northeast, plus the District of Columbia. On December 19, 2019, the Company announced that its Board had determined to sell the Company’s entire suburban New Jersey office portfolio totaling approximately 6.6 million square feet (collectively, the “Suburban Office Portfolio”). As the decision to sell the Suburban Office Portfolio represented a strategic shift in the Company’s operations, these properties’ results (other than a property not classified as held for sale) are being classified as discontinued operations for all periods presented herein. See Note 7: Discontinued Operations. BASIS OF PRESENTATION The accompanying consolidated financial statements include all accounts of the Company, its majority-owned and/or controlled subsidiaries, which consist principally of the Operating Partnership and variable interest entities for which the Company has determined itself to be the primary beneficiary, if any. See Note 2: Significant Accounting Policies – Investments in Unconsolidated Joint Ventures, for the Company’s treatment of unconsolidated joint venture interests. Intercompany accounts and transactions have been eliminated. Accounting Standards Codification (“ASC”) 810, Consolidation, provides guidance on the identification of entities for which control is achieved through means other than voting rights (“variable interest entities” or “VIEs”) and the determination of which business enterprise, if any, should consolidate the VIEs. Generally, the consideration of whether an entity is a VIE applies when either: (1) the equity investors (if any) lack (i) the ability to make decisions about the entity's activities through voting or similar rights, (ii) the obligation to absorb the expected losses of the entity, or (iii) the right to receive the expected residual returns of the entity; (2) the equity investment at risk is insufficient to finance that entity’s activities without additional subordinated financial support; or (3) the equity investors have voting rights that are not proportionate to their economic interests and substantially all of the activities of the entity involve or are conducted on behalf of an investor with a disproportionately small voting interest. The Company consolidates VIEs in which it is considered to be the primary beneficiary. The primary beneficiary is defined by the entity having both of the following characteristics: (1) the power to direct the activities that, when taken together, most significantly impact the variable interest entity’s performance: and (2) the obligation to absorb losses and right to receive the returns from the VIE that would be significant to the VIE. On January 1, 2016, the Company adopted accounting guidance under ASC 810, Consolidation, modifying the analysis it must perform to determine whether it should consolidate certain types of legal entities. The guidance does not amend the existing disclosure requirements for variable interest entities or voting interest model entities. The guidance, however, modified the requirements to qualify under the voting interest model. Under the revised guidance, the Operating Partnership will be a variable interest entity of the parent company, Mack-Cali Realty Corporation. As the Operating Partnership is already consolidated in the balance sheets of Mack-Cali Realty Corporation, the identification of this entity as a variable interest entity has no impact on the consolidated financial statements of Mack-Cali Realty Corporation. There were no other legal entities qualifying under the scope of the revised guidance that were consolidated as a result of the adoption. As of December 31, 2020 and 2019, the Company’s investments in consolidated real estate joint ventures, which are variable interest entities in which the Company is deemed to be the primary beneficiary, other than Roseland Residential, L.P. (See Note 15: Redeemable Noncontrolling Interests-Rockpoint Transaction), have total real estate assets of $ 486.1 million and $ 497.6 million, respectively, other assets of $ 4.5 million and $ 5.5 million, respectively, mortgages of $ 284.8 million and $ 283.7 million, respectively, and other liabilities of $ 21 million and $ 18.9 million, respectively. The financial statements have been prepared in conformity with GAAP. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. These estimates and assumptions are based on management’s historical experience that are believed to be reasonable at the time. However, because future events and their effects cannot be determined with certainty, the determination of estimates requires the exercise of judgment. Actual results could differ from those estimates. Certain reclassifications have been made to prior period amounts in order to conform with current period presentation, primarily related to classification of certain properties as discontinued operations. During the year ended December 31, 2020, the Company’s management recorded an out-of-period adjustment relating to Land and other impairments expense, which was understated for the period ended December 31, 2019. Management concluded that this error was not material to the Company’s consolidated financial statements for any of the current or prior periods. The adjustment is reflected herein as a $ 2.5 million increase to Land and other impairments expense in the Company’s consolidated statements of operations for the year ended December 31, 2020, and a corresponding decrease in Real estate held for sale, net, in the Company’s balance sheets as of December 31, 2020 .
Mack-Cali Realty LP [Member]
Organization And Basis Of Presentation [Line Items]
Organization And Basis Of Presentation	1. ORGANIZATION AND BASIS OF PRESENTATION Organization Mack-Cali Realty Corporation, a Maryland corporation, together with its subsidiaries (collectively, the “General Partner”), is a fully-integrated, self-administered, self-managed real estate investment trust (“REIT”). The General Partner controls Mack-Cali Realty, L.P., a Delaware limited partnership, together with its subsidiaries (collectively, the “Operating Partnership”), as its sole general partner and owned a 90.4 percent common unit interest in the Operating Partnership as of December 31, 2020 and 2019, respectively. The General Partner’s business is the ownership of interests in and operation of the Operating Partnership and all of the General Partner’s expenses are incurred for the benefit of the Operating Partnership. The General Partner is reimbursed by the Operating Partnership for all expenses it incurs relating to the ownership and operation of the Operating Partnership. The Operating Partnership conducts the business of providing leasing, management, acquisition, development and tenant-related services for its General Partner. The Operating Partnership, through its operating divisions and subsidiaries, including the Mack-Cali property-owning partnerships and limited liability companies, is the entity through which all of the General Partner’s operations are conducted. Unless stated otherwise or the context requires, the “Company” refers to the General Partner and its subsidiaries, including the Operating Partnership and its subsidiaries. As of December 31, 2020, the Company owned or had interests in 52 properties (the “Properties”). The Properties are comprised of 25 office buildings totaling approximately 8.1 million square feet and leased to approximately 225 tenants (which include two buildings aggregating approximately 0.2 million square feet owned by unconsolidated joint ventures in which the Company has investment interests), 19 multi-family properties totaling 5,825 apartment units (which include six properties aggregating 1,786 apartment units owned by unconsolidated joint ventures in which the Company has investment interests), four parking/retail properties totaling approximately 108,000 square feet (which include a building aggregating 51,000 square feet owned by unconsolidated joint ventures in which the Company has investment interests), three hotels containing 723 rooms (one of which is owned by an unconsolidated joint venture in which the Company has an investment interest) and a parcel of land leased to a third party. The Properties are located in three states in the Northeast, plus the District of Columbia. On December 19, 2019, the Company announced that its Board had determined to sell the Company’s entire suburban New Jersey office portfolio totaling approximately 6.6 million square feet (collectively, the “Suburban Office Portfolio”). As the decision to sell the Suburban Office Portfolio represented a strategic shift in the Company’s operations, these properties’ results (other than a property not classified as held for sale) are being classified as discontinued operations for all periods presented herein. See Note 7: Discontinued Operations. BASIS OF PRESENTATION The accompanying consolidated financial statements include all accounts of the Company, its majority-owned and/or controlled subsidiaries, which consist principally of the Operating Partnership and variable interest entities for which the Company has determined itself to be the primary beneficiary, if any. See Note 2: Significant Accounting Policies – Investments in Unconsolidated Joint Ventures, for the Company’s treatment of unconsolidated joint venture interests. Intercompany accounts and transactions have been eliminated. Accounting Standards Codification (“ASC”) 810, Consolidation, provides guidance on the identification of entities for which control is achieved through means other than voting rights (“variable interest entities” or “VIEs”) and the determination of which business enterprise, if any, should consolidate the VIEs. Generally, the consideration of whether an entity is a VIE applies when either: (1) the equity investors (if any) lack (i) the ability to make decisions about the entity's activities through voting or similar rights, (ii) the obligation to absorb the expected losses of the entity, or (iii) the right to receive the expected residual returns of the entity; (2) the equity investment at risk is insufficient to finance that entity’s activities without additional subordinated financial support; or (3) the equity investors have voting rights that are not proportionate to their economic interests and substantially all of the activities of the entity involve or are conducted on behalf of an investor with a disproportionately small voting interest. The Company consolidates VIEs in which it is considered to be the primary beneficiary. The primary beneficiary is defined by the entity having both of the following characteristics: (1) the power to direct the activities that, when taken together, most significantly impact the variable interest entity’s performance: and (2) the obligation to absorb losses and right to receive the returns from the VIE that would be significant to the VIE. On January 1, 2016, the Company adopted accounting guidance under ASC 810, Consolidation, modifying the analysis it must perform to determine whether it should consolidate certain types of legal entities. The guidance does not amend the existing disclosure requirements for variable interest entities or voting interest model entities. The guidance, however, modified the requirements to qualify under the voting interest model. Under the revised guidance, the Operating Partnership will be a variable interest entity of the parent company, Mack-Cali Realty Corporation. As the Operating Partnership is already consolidated in the balance sheets of Mack-Cali Realty Corporation, the identification of this entity as a variable interest entity has no impact on the consolidated financial statements of Mack-Cali Realty Corporation. There were no other legal entities qualifying under the scope of the revised guidance that were consolidated as a result of the adoption. As of December 31, 2020 and 2019, the Company’s investments in consolidated real estate joint ventures, which are variable interest entities in which the Company is deemed to be the primary beneficiary, other than Roseland Residential, L.P. (See Note 15: Redeemable Noncontrolling Interests-Rockpoint Transaction), have total real estate assets of $ 486.1 million and $ 497.6 million, respectively, other assets of $ 4.5 million and $ 5.5 million, respectively, mortgages of $ 284.8 million and $ 283.7 million, respectively, and other liabilities of $ 21 million and $ 18.9 million, respectively. The financial statements have been prepared in conformity with GAAP. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. These estimates and assumptions are based on management’s historical experience that are believed to be reasonable at the time. However, because future events and their effects cannot be determined with certainty, the determination of estimates requires the exercise of judgment. Actual results could differ from those estimates. Certain reclassifications have been made to prior period amounts in order to conform with current period presentation, primarily related to classification of certain properties as discontinued operations. During the year ended December 31, 2020, the Company’s management recorded an out-of-period adjustment relating to Land and other impairments expense, which was understated for the period ended December 31, 2019. Management concluded that this error was not material to the Company’s consolidated financial statements for any of the current or prior periods. The adjustment is reflected herein as a $ 2.5 million increase to Land and other impairments expense in the Company’s consolidated statements of operations for the year ended December 31, 2020, and a corresponding decrease in Real estate held for sale, net, in the Company’s balance sheets as of December 31, 2020 .

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2020
Significant Accounting Policies [Line Items]
Significant Accounting Policies	2. SIGNIFICANT ACCOUNTING POLICIES Rental Property Rental properties are stated at cost less accumulated depreciation and amortization. Costs directly related to the acquisition, development and construction of rental properties are capitalized. The Company adopted Financial Accounting Standards Board (“FASB”) guidance Accounting Standards Update (“ASU”) 2017-01 on January 1, 2017, which revises the definition of a business and is expected to result in more transactions to be accounted for as asset acquisitions and significantly limit transactions that would be accounted for as business combinations. Where an acquisition has been determined to be an asset acquisition, acquisition-related costs are capitalized. Capitalized development and construction costs include pre-construction costs essential to the development of the property, development and construction costs, interest, property taxes, insurance, salaries and other project costs incurred during the period of development. Capitalized development and construction salaries and related costs approximated $ 2.0 million, $ 2.1 million and $ 2.3 million for the years ended December 31, 2020, 2019 and 2018, respectively. Ordinary repairs and maintenance are expensed as incurred; major replacements and betterments, which improve or extend the life of the asset, are capitalized and depreciated over their estimated useful lives. Fully-depreciated assets are removed from the accounts. Included in net investment in rental property as of December 31, 2020 and 2019 is real estate and building and tenant improvements not in service; as follows (dollars in thousands) : December 31, December 31, 2020 2019 Land held for development (including pre-development costs, if any) (a)(c) $ 364,946 $ 388,702 Development and construction in progress, including land (b)(d) 733,560 464,110 Total $ 1,098,506 $ 852,812 (a) Includes predevelopment and infrastructure costs included in buildings and improvements of $ 160.3 million and $ 156.5 million as of December 31, 2020 and December 31, 2019, respectively. (b) Includes land of $ 74.9 million and $ 96.6 million as of December 31, 2020 and December 31, 2019, respectively. (c) Includes $ 31.9 million of land and $ 8.9 million of building and improvements pertaining to assets held for sale at December 31, 2020. The Company considers a construction project as substantially completed and held available for occupancy upon the substantial completion of improvements, but no later than one year from cessation of major construction activity (as distinguished from activities such as routine maintenance and cleanup). If portions of a rental project are substantially completed and occupied by tenants or residents, or held available for occupancy, and other portions have not yet reached that stage, the substantially completed portions are accounted for as a separate project. The Company allocates costs incurred between the portions under construction and the portions substantially completed and held available for occupancy, primarily based on a percentage of the relative commercial square footage or multi-family units of each portion, and capitalizes only those costs associated with the portion under construction. Properties are depreciated using the straight-line method over the estimated useful lives of the assets. The estimated useful lives are as follows: Leasehold interests Remaining lease term Buildings and improvements 5 to 40 years Tenant improvements The shorter of the term of the related lease or useful life Furniture, fixtures and equipment 5 to 10 years Upon acquisition of rental property, the Company estimates the fair value of acquired tangible assets, consisting of land, building and improvements, and identified intangible assets and liabilities assumed, generally consisting of the fair value of (i) above and below-market leases, (ii) in-place leases and (iii) tenant relationships. For asset acquisitions, the Company allocates the purchase price to the assets acquired and liabilities assumed based on their relative fair values. The Company records goodwill or a gain on bargain purchase (if any) if the net assets acquired/liabilities assumed differ from the purchase consideration of a business combination transaction. In estimating the fair value of the tangible and intangible assets acquired, the Company considers information obtained about each property as a result of its due diligence and marketing and leasing activities, and utilizes various valuation methods, such as estimated cash flow projections utilizing appropriate discount and capitalization rates, estimates of replacement costs net of depreciation, and available market information. The fair value of the tangible assets of an acquired property considers the value of the property as if it were vacant. Above-market and below-market lease values for acquired properties are initially recorded based on the present value (using a discount rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to each in-place lease and (ii) management’s estimate of fair market lease rates for each corresponding in-place lease, measured over a period equal to the remaining term of the lease for above-market leases and the remaining initial term plus the term of any below-market fixed rate renewal options for below-market leases. The capitalized above-market lease values are amortized as a reduction of base rental revenue over the remaining terms of the respective leases, and the capitalized below-market lease values are amortized as an increase to base rental revenue over the remaining initial terms plus the terms of any below-market fixed rate renewal options of the respective leases. Other intangible assets acquired include amounts for in-place lease values and tenant relationship values, which are based on management’s evaluation of the specific characteristics of each tenant’s lease and the Company’s overall relationship with the respective tenant. Factors to be considered by management in its analysis of in-place lease values include an estimate of carrying costs during hypothetical expected lease-up periods considering current market conditions, and costs to execute similar leases. In estimating carrying costs, management includes real estate taxes, insurance and other operating expenses and estimates of lost rentals at market rates during the expected lease-up periods, depending on local market conditions. In estimating costs to execute similar leases, management considers leasing commissions, legal and other related expenses. Characteristics considered by management in valuing tenant relationships include the nature and extent of the Company’s existing business relationships with the tenant, growth prospects for developing new business with the tenant, the tenant’s credit quality and expectations of lease renewals. The values of in-place leases are amortized to expense over the remaining initial terms of the respective leases. The values of tenant relationship intangibles are amortized to expense over the anticipated life of the relationships or leases. On a periodic basis, management assesses whether there are any indicators that the value of the Company’s rental properties held for use may be impaired. In addition to identifying any specific circumstances which may affect a property or properties, management considers other criteria for determining which properties may require assessment for potential impairment. The criteria considered by management, depending on the type of property, may include reviewing low leased percentages, significant near-term lease expirations, current and historical operating and/or cash flow losses, construction cost overruns and/or other factors, including those that might impact the Company’s intent and ability to hold the property. A property’s value is impaired only if management’s estimate of the aggregate future cash flows (undiscounted and without interest charges) to be generated by the property over its estimated holding period is less than the carrying value of the property. If there are different possible scenarios for a property, the Company will take a probability weighted approach to estimating future cash flow scenarios. To the extent impairment has occurred, the impairment loss is measured as the excess of the carrying value of the property over the fair value of the property. The Company’s estimates of aggregate future cash flows expected to be generated and estimated fair values for each property are based on a number of assumptions, including but not limited to estimated holding periods, market capitalization rates and discount rates, if applicable. For developable land holdings, an estimated per-unit market value assumption is also considered based on development rights for the land. These assumptions are generally based on management’s experience in its local real estate markets and the effects of current market conditions. The assumptions are subject to economic and market uncertainties including, among others, demand for space, competition for tenants, changes in market rental rates, food, beverage and lodging demands, and costs to operate each property. As these factors are difficult to predict and are subject to future events that may alter management’s assumptions, the future cash flows estimated by management in its impairment analyses may not be achieved, and actual losses or impairments may be realized in the future. Real Estate Held for Sale and Discontinued Operations When assets are identified by management as held for sale, the Company discontinues depreciating the assets and estimates the sales price, net of expected selling costs, of such assets. The Company generally considers assets (as identified by their disposal groups) to be held for sale when the transaction has received appropriate corporate authority, it is probable to be sold within the following 12 months, and there are no significant contingencies relating to a sale. If, in management’s opinion, the estimated net sales price, net of expected selling costs, of the disposal groups which have been identified as held for sale is less than the carrying value of the assets, a valuation allowance (which is recorded as unrealized losses on disposition of rental property) is established. In the absence of an executed sales agreement with a set sales price, management’s estimate of the net sales price may be based on a number of assumptions, including but not limited to the Company’s estimates of future cash flows, market capitalization rates and discount rates, if applicable. For developable land holdings, an estimated per-unit market value assumption is also considered based on development rights for the land. In addition, the Company classifies assets held for sale or sold as discontinued operations if the disposal groups represent a strategic shift that will have a major effect on the Company’s operations and financial results. For any disposals qualifying as discontinued operations, the assets and their results are presented in discontinued operations in the financial statements for all periods presented. See Note 7: Discontinued Operations. If circumstances arise that previously were considered unlikely and, as a result, the Company has determined that an asset previously classified as held for sale, no longer meets the held for sale criteria, the asset is reclassified as held and used. An asset that is reclassified is measured and recorded individually at the lower of (a) its carrying value before the asset was classified as held for sale, adjusted for any depreciation (amortization) expense that would have been recognized had the asset been continuously classified as held and used, or (b) the fair value at the date the asset qualified as held for sale. Investments in Unconsolidated Joint Ventures The Company accounts for its investments in unconsolidated joint ventures under the equity method of accounting. The Company applies the equity method by initially recording these investments at cost, as Investments in Unconsolidated Joint Ventures, subsequently adjusted for equity in earnings and cash contributions and distributions. The outside basis portion of the Company’s joint ventures is amortized over the anticipated useful lives of the underlying ventures’ tangible and intangible assets acquired and liabilities assumed. Generally, the Company would discontinue applying the equity method when the investment (and any advances) is reduced to zero and would not provide for additional losses unless the Company has guaranteed obligations of the venture or is otherwise committed to providing further financial support for the investee. If the venture subsequently generates income, the Company only recognizes its share of such income to the extent it exceeds its share of previously unrecognized losses. If the venture subsequently makes distributions and the Company does not have an implied or actual commitment to support the operations of the venture, the Company will not record a basis less than zero, rather such amounts will be recorded as equity in earnings of unconsolidated joint ventures. On a periodic basis, management assesses whether there are any indicators that the value of the Company’s investments in unconsolidated joint ventures may be impaired. An investment is impaired only if management’s estimate of the value of the investment is less than the carrying value of the investment, and such decline in value is deemed to be other than temporary. To the extent impairment has occurred, the loss shall be measured as the excess of the carrying value of the investment over the value of the investment. The Company’s estimates of value for each investment (particularly in real estate joint ventures) are based on a number of assumptions including but not limited to estimates of future cash flows, market capitalization rates and discount rates, if applicable. These assumptions are based on management's experience in its local real estate markets and the effects of current market conditions. The assumptions are subject to economic and market uncertainties including, among others, demand for space, competition for tenants, changes in market rental rates, and operating costs. As these factors are difficult to predict and are subject to future events that may alter management’s assumptions, the values estimated by management in its impairment analyses may not be realized, and actual losses or impairment may be realized in the future. See Note 4: Investments in Unconsolidated Joint Ventures. Cash and Cash Equivalents All highly liquid investments with an original maturity of three months or less when purchased are considered to be cash equivalents. Deferred Financing Costs Costs incurred in obtaining financing are capitalized and amortized over the term of the related indebtedness. Deferred financing costs are presented in the balance sheet as a direct deduction from the carrying value of the debt liability to which they relate, except deferred financing costs related to the revolving credit facility, which are presented in deferred charges, goodwill and other assets. In all cases, amortization of such costs is included in interest expense and was $ 4,625,000 , $ 4,625,000 and $ 5,028,000 for the years ended December 31, 2020, 2019 and 2018, respectively. If a financing obligation is extinguished early, any unamortized deferred financing costs are written off and included in gains (losses) from extinguishment of debt. Included in the gains(losses) from extinguishment of debt, net, of $( 0.3 ) million, $ 1.6 million and $( 10.8 ) million (of which $ 1.8 million loss pertained to properties classified as discontinued operations) for the years ended December 31, 2020, 2019 and 2018 were unamortized deferred financing costs which were written off (as non-cash transactions) amounting to zero , $ 0.4 million and $ 0.6 million, respectively. Deferred Leasing Costs/Leasing Personnel Costs Costs incurred in connection with successfully executed commercial and residential leases were capitalized and amortized on a straight-line basis over the terms of the related leases and included in depreciation and amortization. Unamortized deferred leasing costs were charged to amortization expense upon early termination of the lease. Certain employees of the Company are compensated for providing leasing services to the Properties. The portion of such compensation related to commercial leases, which was capitalized and amortized, and included in deferred charges, goodwill and other assets, net, was approximately $ 3,463,000 for the year ended December 31, 2018. Upon the adoption of ASC 842 on January 1, 2019, the Company no longer capitalizes such costs, and includes such leasing personnel costs in General and Administrative expense costs in the Company’s Consolidated Statements of Operations, which amounted to $ 1,483,000 and $ 2,261,000 (excluding any severance – related costs) for the years ended December 31, 2020 and 2019, respectively. Goodwill Goodwill represents the excess of the purchase price over the fair value of net tangible and intangible assets acquired in a business combination. Goodwill is allocated to various reporting units, as applicable. Each of the Company’s segments consists of a reporting unit. Goodwill is not amortized. Management performs an annual impairment test for goodwill during the fourth quarter and between annual tests, management evaluates the recoverability of goodwill whenever events or changes in circumstances indicate that the carrying value of goodwill may not be fully recoverable. In its impairment tests of goodwill, management first assesses qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying value. If, based on this assessment, management determines that the fair value of the reporting unit is not less than its carrying value, then performing the additional two-step impairment test is unnecessary. If the carrying value of goodwill exceeds its fair value, an impairment charge is recognized. The Company determined that its goodwill, with a balance of $ 2.9 million, was no t impaired at December 31, 2020 after management performed its impairment tests. Derivative Instruments The Company measures derivative instruments, including certain derivative instruments embedded in other contracts, at fair value and records them as an asset or liability, depending on the Company’s rights or obligations under the applicable derivative contract. For derivatives designated and qualifying as fair value hedges, the changes in the fair value of both the derivative instrument and the hedged item are recorded in earnings. For derivatives designated as cash flow hedges, the effective portions of the derivative are reported in other comprehensive income (“OCI”) and are subsequently reclassified into earnings when the hedged item affects earnings. Changes in fair value of derivative instruments not designated as hedging and ineffective portions of hedges are recognized in earnings in the affected period. Revenue Recognition Revenue from leases includes fixed base rents under leases, which are recognized on a straight-line basis over the terms of the respective leases. Unbilled rents receivable represents the cumulative amount by which straight-line rental revenue exceeds rents currently billed in accordance with the lease agreements. Above-market and below-market lease values for acquired properties are initially recorded based on the present value (using a discount rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to each in-place lease and (ii) management’s estimate of fair market lease rates for each corresponding in-place lease, measured over a period equal to the remaining term of the lease for above-market leases and the remaining initial term plus the term of any below-market fixed-rate renewal options for below-market leases. The capitalized above-market lease values for acquired properties are amortized as a reduction of revenue from leases over the remaining terms of the respective leases, and the capitalized below-market lease values are amortized as an increase to revenue from leases over the remaining initial terms plus the terms of any below-market fixed-rate renewal options of the respective leases. The Company elected a practical expedient for its rental properties (as lessor) to avoid separating non-lease components that otherwise would need to be accounted for under the recently-adopted revenue accounting guidance (such as tenant reimbursements of property operating expenses) from the associated lease component since (1) the non-lease components have the same timing and pattern of transfer as the associated lease component and (2) the lease component, if accounted for separately, would be classified as an operating lease; this enables the Company to account for the combination of the lease component and non-lease components as an operating lease since the lease component is the predominant component of the combined components. Due to the Company’s adoption of the practical expedient discussed above to not separate non-lease component revenue from the associated lease component, the Company is aggregating revenue from its lease components and non-lease components (comprised predominantly of tenant operating expense reimbursements) into the line entitled “Revenue from leases.” Revenue from leases also includes reimbursements and recoveries from tenants received from tenants for certain costs as provided in the lease agreements. These costs generally include real estate taxes, utilities, insurance, common area maintenance and other recoverable costs. See Note 14: Tenant Leases. Real estate services revenue includes property management, development, construction and leasing commission fees and other services, and payroll and related costs reimbursed from clients. Fee income derived from the Company’s unconsolidated joint ventures (which are capitalized by such ventures) are recognized to the extent attributable to the unaffiliated ownership interests. Parking income is comprised of income from parking spaces leased to tenants and others. Hotel income includes all revenue generated from hotel properties. Other income includes income from tenants for additional services arranged for by the Company and income from tenants for early lease terminations. All bad debt expense is being recorded as a reduction of the corresponding revenue account starting on January 1, 2019. Management performs a detailed review of amounts due from tenants for collectability, based on factors affecting the billings and status of individual tenants. The factors considered by management in determining which individual tenant’s revenues are affected include the age of the receivable, the tenant’s payment history, the nature of the charges, any communications regarding the charges and other related information. Management’s estimate of bad debt write-off’s requires management to exercise judgment about the timing, frequency and severity of collection losses, which affects the revenue recorded. Income and Other Taxes The General Partner has elected to be taxed as a REIT under Sections 856 through 860 of the Internal Revenue Code of 1986, as amended (the “IRS Code”). As a REIT, the General Partner generally will not be subject to corporate federal income tax on net income that it currently distributes to its shareholders, provided that the General Partner satisfies certain organizational and operational requirements including the requirement to distribute at least 90 percent of its REIT taxable income (determined by excluding any net capital gains) to its shareholders. If and to the extent the General Partner retains and does not distribute any net capital gains, the General Partner will be required to pay federal, state and local taxes, as applicable, on such net capital gains at the rate applicable to capital gains of a corporation. The Operating Partnership is a partnership, and, as a result, all income and losses of the partnership are allocated to the partners for inclusion in their respective tax returns. Accordingly, no provision or benefit for income taxes has been made in the accompanying financial statements. As of December 31, 2020, the estimated net basis of the rental property for federal income tax purposes was lower than the net assets as reported in the Operating Partnership’s financial statements by approximately $ 669,239,000 . The Operating Partnership’s taxable income for the years ended December 31, 2020, 2019 and 2018 was estimated to be approximately $ 79,293,000 , $ 71,151,000 and $ 82,106,000 , respectively. The differences between book income and taxable income primarily result from differences in depreciation expenses, the recording of rental income, differences in the deductibility of interest expense and certain other expenses for tax purposes, differences in revenue recognition and the rules for tax purposes of a property exchange. The General Partner has elected to treat certain of its corporate subsidiaries as taxable REIT subsidiaries (each a “TRS”). In general, a TRS of the General Partner may perform additional services for tenants of the Company and generally may engage in any real estate or non-real estate related business (except for the operation or management of health care facilities or lodging facilities or the providing to any person, under a franchise, license or otherwise, rights to any brand name under which any lodging facility or health care facility is operated). A TRS is subject to corporate federal income tax. The General Partner has conducted business through its TRS entities for certain property management, development, construction and other related services, as well as to hold a joint venture interest in a hotel and other matters. The deferred tax asset balance at December 31, 2020 amounted to $ 16.2 million which has been fully reserved through a valuation allowance. New tax reform legislation enacted in late 2017 reduced the corporate tax rate to 21 percent, effective January 1, 2018. Consequently, the Company’s deferred tax assets were re-measured to reflect the reduction in the future U.S. corporate income tax rate as of the enactment date. As a result, the Company recorded a decrease related to its deferred tax assets of $ 5.3 million and a decrease to the associated valuation allowance of $ 5.3 million at December 31, 2017. If the General Partner fails to qualify as a REIT in any taxable year, the Company will be subject to federal income tax on its taxable income at regular corporate tax rates. The Company is subject to certain state and local taxes. Pursuant to the amended provisions related to uncertain tax provisions of ASC 740, Income Taxes, the Company recognized no material adjustments regarding its tax accounting treatment. The Company expects to recognize interest and penalties related to uncertain tax positions, if any, as income tax expense, which is included in general and administrative expense. In the normal course of business, the Company or one of its subsidiaries is subject to examination by federal, state and local jurisdictions in which it operates, where applicable. As of December 31, 2020, the tax years that remain subject to examination by the major tax jurisdictions under the statute of limitations are generally from the year 2016 forward. Earnings Per Share or Unit The Company presents both basic and diluted earnings per share or unit (“EPS or EPU”). Basic EPS or EPU excludes dilution and is computed by dividing net income available to common shareholders or unitholders by the weighted average number of shares or units outstanding for the period. Diluted EPS or EPU reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock, where such exercise or conversion would result in a lower EPS or EPU from continuing operations amount. Shares or units whose issuance is contingent upon the satisfaction of certain conditions shall be considered outstanding and included in the computation of diluted EPS or EPU as follows (i) if all necessary conditions have been satisfied by the end of the period (the events have occurred), those shares or units shall be included as of the beginning of the period in which the conditions were satisfied (or as of the date of the grant, if later) or (ii) if all necessary conditions have not been satisfied by the end of the period, the number of contingently issuable shares or units included in diluted EPS or EPU shall be based on the number of shares or units, if any, that would be issuable if the end of the reporting period were the end of the contingency period (for example, the number of shares or units that would be issuable based on current period earnings or period-end market price) and if the result would be dilutive. Those contingently issuable shares or units shall be included in the denominator of diluted EPS or EPU as of the beginning of the period (or as of the date of the grant, if later). Dividends and Distributions Payable On September 30, 2020, the Company announced that its Board of Directors was suspending its common dividends and distributions attributable to the third and fourth quarters 2020. As the Company’s management estimated that as of September 2020 it had satisfied its dividends obligations as a REIT on taxable income expected for 2020, the Board made the strategic decision to suspend its common dividends and distributions for the remainder of 2020 in an effort to provide greater financial flexibility during the pandemic and to retain incremental capital to support leasing initiatives at its Harborside commercial office properties on the Jersey City waterfront. The dividends and distributions payable at December 31, 2020 represent amounts payable on unvested LTIP units. The dividends and distributions payable at December 31, 2019 represents dividends payable to common shareholders ( 90,595,197 shares) and distributions payable to noncontrolling interests unitholders of the Operating Partnership ( 9,488,794 common units and 1,949,601 vested and unvested LTIP units) for all such holders of record as of January 3, 2020 with respect to the fourth quarter 2019. The fourth quarter 2019 common stock dividends and unit distributions of $ 0.20 per common share (total of $ 18.1 million), common unit (total of $ 1.9 million) and LTIP unit (total of $ 0.4 million) were approved by the General Partner’s Board of Directors on December 17, 2019 and paid on January 10, 2020 . The Company has determined that the $ 0.60 dividend per common share paid during the year ended December 31, 2020 represented approximately 19 percent ordinary income and approximately 81 percent capital gain; the $ 0.80 dividend per common share paid during the year ended December 31, 2019 represented 100 percent capital gain and the $ 0.80 dividend per common share paid during the year ended December 31, 2018 represented approximately 47 percent ordinary income and approximately 53 percent capital gain. Costs Incurred For Stock Issuances Costs incurred in connection with the Company’s stock issuances are reflected as a reduction of additional paid - in capital. Stock Compensation The Company accounts for stock compensation in accordance with the provisions of ASC 718, Compensation-Stock Compensation. These provisions require that the estimated fair value of restricted stock (“Restricted Stock Awards”), performance share units, long term incentive plan awards and stock options at the grant date be amortized ratably into expense over the appropriate vesting period. For unvested securities that are forfeited prior to the measurement period being complete, the Company elected to account for forfeiture of employee awards as they occur. The Company recorded stock compensation expense of $ 7,635,000 , $ 8,161,000 and $ 6,894,000 for the years ended December 31, 2020, 2019 and 2018, respectively. Other Comprehensive Income (Loss) Other comprehensive income (loss) includes items that are recorded in equity, such as effective portions of derivatives designated as cash flow hedges or unrealized holding gains or losses on marketable securities available for sale. Redeemable Noncontrolling Interests The Company evaluates the terms of the partnership units issued in accordance with the FASB’s Distinguis
Mack-Cali Realty LP [Member]
Significant Accounting Policies [Line Items]
Significant Accounting Policies	2. SIGNIFICANT ACCOUNTING POLICIES Rental Property Rental properties are stated at cost less accumulated depreciation and amortization. Costs directly related to the acquisition, development and construction of rental properties are capitalized. The Company adopted Financial Accounting Standards Board (“FASB”) guidance Accounting Standards Update (“ASU”) 2017-01 on January 1, 2017, which revises the definition of a business and is expected to result in more transactions to be accounted for as asset acquisitions and significantly limit transactions that would be accounted for as business combinations. Where an acquisition has been determined to be an asset acquisition, acquisition-related costs are capitalized. Capitalized development and construction costs include pre-construction costs essential to the development of the property, development and construction costs, interest, property taxes, insurance, salaries and other project costs incurred during the period of development. Capitalized development and construction salaries and related costs approximated $ 2.0 million, $ 2.1 million and $ 2.3 million for the years ended December 31, 2020, 2019 and 2018, respectively. Ordinary repairs and maintenance are expensed as incurred; major replacements and betterments, which improve or extend the life of the asset, are capitalized and depreciated over their estimated useful lives. Fully-depreciated assets are removed from the accounts. Included in net investment in rental property as of December 31, 2020 and 2019 is real estate and building and tenant improvements not in service; as follows (dollars in thousands) : December 31, December 31, 2020 2019 Land held for development (including pre-development costs, if any) (a)(c) $ 364,946 $ 388,702 Development and construction in progress, including land (b)(d) 733,560 464,110 Total $ 1,098,506 $ 852,812 (a) Includes predevelopment and infrastructure costs included in buildings and improvements of $ 160.3 million and $ 156.5 million as of December 31, 2020 and December 31, 2019, respectively. (b) Includes land of $ 74.9 million and $ 96.6 million as of December 31, 2020 and December 31, 2019, respectively. (c) Includes $ 31.9 million of land and $ 8.9 million of building and improvements pertaining to assets held for sale at December 31, 2020. The Company considers a construction project as substantially completed and held available for occupancy upon the substantial completion of improvements, but no later than one year from cessation of major construction activity (as distinguished from activities such as routine maintenance and cleanup). If portions of a rental project are substantially completed and occupied by tenants or residents, or held available for occupancy, and other portions have not yet reached that stage, the substantially completed portions are accounted for as a separate project. The Company allocates costs incurred between the portions under construction and the portions substantially completed and held available for occupancy, primarily based on a percentage of the relative commercial square footage or multi-family units of each portion, and capitalizes only those costs associated with the portion under construction. Properties are depreciated using the straight-line method over the estimated useful lives of the assets. The estimated useful lives are as follows: Leasehold interests Remaining lease term Buildings and improvements 5 to 40 years Tenant improvements The shorter of the term of the related lease or useful life Furniture, fixtures and equipment 5 to 10 years Upon acquisition of rental property, the Company estimates the fair value of acquired tangible assets, consisting of land, building and improvements, and identified intangible assets and liabilities assumed, generally consisting of the fair value of (i) above and below-market leases, (ii) in-place leases and (iii) tenant relationships. For asset acquisitions, the Company allocates the purchase price to the assets acquired and liabilities assumed based on their relative fair values. The Company records goodwill or a gain on bargain purchase (if any) if the net assets acquired/liabilities assumed differ from the purchase consideration of a business combination transaction. In estimating the fair value of the tangible and intangible assets acquired, the Company considers information obtained about each property as a result of its due diligence and marketing and leasing activities, and utilizes various valuation methods, such as estimated cash flow projections utilizing appropriate discount and capitalization rates, estimates of replacement costs net of depreciation, and available market information. The fair value of the tangible assets of an acquired property considers the value of the property as if it were vacant. Above-market and below-market lease values for acquired properties are initially recorded based on the present value (using a discount rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to each in-place lease and (ii) management’s estimate of fair market lease rates for each corresponding in-place lease, measured over a period equal to the remaining term of the lease for above-market leases and the remaining initial term plus the term of any below-market fixed rate renewal options for below-market leases. The capitalized above-market lease values are amortized as a reduction of base rental revenue over the remaining terms of the respective leases, and the capitalized below-market lease values are amortized as an increase to base rental revenue over the remaining initial terms plus the terms of any below-market fixed rate renewal options of the respective leases. Other intangible assets acquired include amounts for in-place lease values and tenant relationship values, which are based on management’s evaluation of the specific characteristics of each tenant’s lease and the Company’s overall relationship with the respective tenant. Factors to be considered by management in its analysis of in-place lease values include an estimate of carrying costs during hypothetical expected lease-up periods considering current market conditions, and costs to execute similar leases. In estimating carrying costs, management includes real estate taxes, insurance and other operating expenses and estimates of lost rentals at market rates during the expected lease-up periods, depending on local market conditions. In estimating costs to execute similar leases, management considers leasing commissions, legal and other related expenses. Characteristics considered by management in valuing tenant relationships include the nature and extent of the Company’s existing business relationships with the tenant, growth prospects for developing new business with the tenant, the tenant’s credit quality and expectations of lease renewals. The values of in-place leases are amortized to expense over the remaining initial terms of the respective leases. The values of tenant relationship intangibles are amortized to expense over the anticipated life of the relationships or leases. On a periodic basis, management assesses whether there are any indicators that the value of the Company’s rental properties held for use may be impaired. In addition to identifying any specific circumstances which may affect a property or properties, management considers other criteria for determining which properties may require assessment for potential impairment. The criteria considered by management, depending on the type of property, may include reviewing low leased percentages, significant near-term lease expirations, current and historical operating and/or cash flow losses, construction cost overruns and/or other factors, including those that might impact the Company’s intent and ability to hold the property. A property’s value is impaired only if management’s estimate of the aggregate future cash flows (undiscounted and without interest charges) to be generated by the property over its estimated holding period is less than the carrying value of the property. If there are different possible scenarios for a property, the Company will take a probability weighted approach to estimating future cash flow scenarios. To the extent impairment has occurred, the impairment loss is measured as the excess of the carrying value of the property over the fair value of the property. The Company’s estimates of aggregate future cash flows expected to be generated and estimated fair values for each property are based on a number of assumptions, including but not limited to estimated holding periods, market capitalization rates and discount rates, if applicable. For developable land holdings, an estimated per-unit market value assumption is also considered based on development rights for the land. These assumptions are generally based on management’s experience in its local real estate markets and the effects of current market conditions. The assumptions are subject to economic and market uncertainties including, among others, demand for space, competition for tenants, changes in market rental rates, food, beverage and lodging demands, and costs to operate each property. As these factors are difficult to predict and are subject to future events that may alter management’s assumptions, the future cash flows estimated by management in its impairment analyses may not be achieved, and actual losses or impairments may be realized in the future. Real Estate Held for Sale and Discontinued Operations When assets are identified by management as held for sale, the Company discontinues depreciating the assets and estimates the sales price, net of expected selling costs, of such assets. The Company generally considers assets (as identified by their disposal groups) to be held for sale when the transaction has received appropriate corporate authority, it is probable to be sold within the following 12 months, and there are no significant contingencies relating to a sale. If, in management’s opinion, the estimated net sales price, net of expected selling costs, of the disposal groups which have been identified as held for sale is less than the carrying value of the assets, a valuation allowance (which is recorded as unrealized losses on disposition of rental property) is established. In the absence of an executed sales agreement with a set sales price, management’s estimate of the net sales price may be based on a number of assumptions, including but not limited to the Company’s estimates of future cash flows, market capitalization rates and discount rates, if applicable. For developable land holdings, an estimated per-unit market value assumption is also considered based on development rights for the land. In addition, the Company classifies assets held for sale or sold as discontinued operations if the disposal groups represent a strategic shift that will have a major effect on the Company’s operations and financial results. For any disposals qualifying as discontinued operations, the assets and their results are presented in discontinued operations in the financial statements for all periods presented. See Note 7: Discontinued Operations. If circumstances arise that previously were considered unlikely and, as a result, the Company has determined that an asset previously classified as held for sale, no longer meets the held for sale criteria, the asset is reclassified as held and used. An asset that is reclassified is measured and recorded individually at the lower of (a) its carrying value before the asset was classified as held for sale, adjusted for any depreciation (amortization) expense that would have been recognized had the asset been continuously classified as held and used, or (b) the fair value at the date the asset qualified as held for sale. Investments in Unconsolidated Joint Ventures The Company accounts for its investments in unconsolidated joint ventures under the equity method of accounting. The Company applies the equity method by initially recording these investments at cost, as Investments in Unconsolidated Joint Ventures, subsequently adjusted for equity in earnings and cash contributions and distributions. The outside basis portion of the Company’s joint ventures is amortized over the anticipated useful lives of the underlying ventures’ tangible and intangible assets acquired and liabilities assumed. Generally, the Company would discontinue applying the equity method when the investment (and any advances) is reduced to zero and would not provide for additional losses unless the Company has guaranteed obligations of the venture or is otherwise committed to providing further financial support for the investee. If the venture subsequently generates income, the Company only recognizes its share of such income to the extent it exceeds its share of previously unrecognized losses. If the venture subsequently makes distributions and the Company does not have an implied or actual commitment to support the operations of the venture, the Company will not record a basis less than zero, rather such amounts will be recorded as equity in earnings of unconsolidated joint ventures. On a periodic basis, management assesses whether there are any indicators that the value of the Company’s investments in unconsolidated joint ventures may be impaired. An investment is impaired only if management’s estimate of the value of the investment is less than the carrying value of the investment, and such decline in value is deemed to be other than temporary. To the extent impairment has occurred, the loss shall be measured as the excess of the carrying value of the investment over the value of the investment. The Company’s estimates of value for each investment (particularly in real estate joint ventures) are based on a number of assumptions including but not limited to estimates of future cash flows, market capitalization rates and discount rates, if applicable. These assumptions are based on management's experience in its local real estate markets and the effects of current market conditions. The assumptions are subject to economic and market uncertainties including, among others, demand for space, competition for tenants, changes in market rental rates, and operating costs. As these factors are difficult to predict and are subject to future events that may alter management’s assumptions, the values estimated by management in its impairment analyses may not be realized, and actual losses or impairment may be realized in the future. See Note 4: Investments in Unconsolidated Joint Ventures. Cash and Cash Equivalents All highly liquid investments with an original maturity of three months or less when purchased are considered to be cash equivalents. Deferred Financing Costs Costs incurred in obtaining financing are capitalized and amortized over the term of the related indebtedness. Deferred financing costs are presented in the balance sheet as a direct deduction from the carrying value of the debt liability to which they relate, except deferred financing costs related to the revolving credit facility, which are presented in deferred charges, goodwill and other assets. In all cases, amortization of such costs is included in interest expense and was $ 4,625,000 , $ 4,625,000 and $ 5,028,000 for the years ended December 31, 2020, 2019 and 2018, respectively. If a financing obligation is extinguished early, any unamortized deferred financing costs are written off and included in gains (losses) from extinguishment of debt. Included in the gains(losses) from extinguishment of debt, net, of $( 0.3 ) million, $ 1.6 million and $( 10.8 ) million (of which $ 1.8 million loss pertained to properties classified as discontinued operations) for the years ended December 31, 2020, 2019 and 2018 were unamortized deferred financing costs which were written off (as non-cash transactions) amounting to zero , $ 0.4 million and $ 0.6 million, respectively. Deferred Leasing Costs/Leasing Personnel Costs Costs incurred in connection with successfully executed commercial and residential leases were capitalized and amortized on a straight-line basis over the terms of the related leases and included in depreciation and amortization. Unamortized deferred leasing costs were charged to amortization expense upon early termination of the lease. Certain employees of the Company are compensated for providing leasing services to the Properties. The portion of such compensation related to commercial leases, which was capitalized and amortized, and included in deferred charges, goodwill and other assets, net, was approximately $ 3,463,000 for the year ended December 31, 2018. Upon the adoption of ASC 842 on January 1, 2019, the Company no longer capitalizes such costs, and includes such leasing personnel costs in General and Administrative expense costs in the Company’s Consolidated Statements of Operations, which amounted to $ 1,483,000 and $ 2,261,000 (excluding any severance – related costs) for the years ended December 31, 2020 and 2019, respectively. Goodwill Goodwill represents the excess of the purchase price over the fair value of net tangible and intangible assets acquired in a business combination. Goodwill is allocated to various reporting units, as applicable. Each of the Company’s segments consists of a reporting unit. Goodwill is not amortized. Management performs an annual impairment test for goodwill during the fourth quarter and between annual tests, management evaluates the recoverability of goodwill whenever events or changes in circumstances indicate that the carrying value of goodwill may not be fully recoverable. In its impairment tests of goodwill, management first assesses qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying value. If, based on this assessment, management determines that the fair value of the reporting unit is not less than its carrying value, then performing the additional two-step impairment test is unnecessary. If the carrying value of goodwill exceeds its fair value, an impairment charge is recognized. The Company determined that its goodwill, with a balance of $ 2.9 million, was no t impaired at December 31, 2020 after management performed its impairment tests. Derivative Instruments The Company measures derivative instruments, including certain derivative instruments embedded in other contracts, at fair value and records them as an asset or liability, depending on the Company’s rights or obligations under the applicable derivative contract. For derivatives designated and qualifying as fair value hedges, the changes in the fair value of both the derivative instrument and the hedged item are recorded in earnings. For derivatives designated as cash flow hedges, the effective portions of the derivative are reported in other comprehensive income (“OCI”) and are subsequently reclassified into earnings when the hedged item affects earnings. Changes in fair value of derivative instruments not designated as hedging and ineffective portions of hedges are recognized in earnings in the affected period. Revenue Recognition Revenue from leases includes fixed base rents under leases, which are recognized on a straight-line basis over the terms of the respective leases. Unbilled rents receivable represents the cumulative amount by which straight-line rental revenue exceeds rents currently billed in accordance with the lease agreements. Above-market and below-market lease values for acquired properties are initially recorded based on the present value (using a discount rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to each in-place lease and (ii) management’s estimate of fair market lease rates for each corresponding in-place lease, measured over a period equal to the remaining term of the lease for above-market leases and the remaining initial term plus the term of any below-market fixed-rate renewal options for below-market leases. The capitalized above-market lease values for acquired properties are amortized as a reduction of revenue from leases over the remaining terms of the respective leases, and the capitalized below-market lease values are amortized as an increase to revenue from leases over the remaining initial terms plus the terms of any below-market fixed-rate renewal options of the respective leases. The Company elected a practical expedient for its rental properties (as lessor) to avoid separating non-lease components that otherwise would need to be accounted for under the recently-adopted revenue accounting guidance (such as tenant reimbursements of property operating expenses) from the associated lease component since (1) the non-lease components have the same timing and pattern of transfer as the associated lease component and (2) the lease component, if accounted for separately, would be classified as an operating lease; this enables the Company to account for the combination of the lease component and non-lease components as an operating lease since the lease component is the predominant component of the combined components. Due to the Company’s adoption of the practical expedient discussed above to not separate non-lease component revenue from the associated lease component, the Company is aggregating revenue from its lease components and non-lease components (comprised predominantly of tenant operating expense reimbursements) into the line entitled “Revenue from leases.” Revenue from leases also includes reimbursements and recoveries from tenants received from tenants for certain costs as provided in the lease agreements. These costs generally include real estate taxes, utilities, insurance, common area maintenance and other recoverable costs. See Note 14: Tenant Leases. Real estate services revenue includes property management, development, construction and leasing commission fees and other services, and payroll and related costs reimbursed from clients. Fee income derived from the Company’s unconsolidated joint ventures (which are capitalized by such ventures) are recognized to the extent attributable to the unaffiliated ownership interests. Parking income is comprised of income from parking spaces leased to tenants and others. Hotel income includes all revenue generated from hotel properties. Other income includes income from tenants for additional services arranged for by the Company and income from tenants for early lease terminations. All bad debt expense is being recorded as a reduction of the corresponding revenue account starting on January 1, 2019. Management performs a detailed review of amounts due from tenants for collectability, based on factors affecting the billings and status of individual tenants. The factors considered by management in determining which individual tenant’s revenues are affected include the age of the receivable, the tenant’s payment history, the nature of the charges, any communications regarding the charges and other related information. Management’s estimate of bad debt write-off’s requires management to exercise judgment about the timing, frequency and severity of collection losses, which affects the revenue recorded. Income and Other Taxes The General Partner has elected to be taxed as a REIT under Sections 856 through 860 of the Internal Revenue Code of 1986, as amended (the “IRS Code”). As a REIT, the General Partner generally will not be subject to corporate federal income tax on net income that it currently distributes to its shareholders, provided that the General Partner satisfies certain organizational and operational requirements including the requirement to distribute at least 90 percent of its REIT taxable income (determined by excluding any net capital gains) to its shareholders. If and to the extent the General Partner retains and does not distribute any net capital gains, the General Partner will be required to pay federal, state and local taxes, as applicable, on such net capital gains at the rate applicable to capital gains of a corporation. The Operating Partnership is a partnership, and, as a result, all income and losses of the partnership are allocated to the partners for inclusion in their respective tax returns. Accordingly, no provision or benefit for income taxes has been made in the accompanying financial statements. As of December 31, 2020, the estimated net basis of the rental property for federal income tax purposes was lower than the net assets as reported in the Operating Partnership’s financial statements by approximately $ 669,239,000 . The Operating Partnership’s taxable income for the years ended December 31, 2020, 2019 and 2018 was estimated to be approximately $ 79,293,000 , $ 71,151,000 and $ 82,106,000 , respectively. The differences between book income and taxable income primarily result from differences in depreciation expenses, the recording of rental income, differences in the deductibility of interest expense and certain other expenses for tax purposes, differences in revenue recognition and the rules for tax purposes of a property exchange. The General Partner has elected to treat certain of its corporate subsidiaries as taxable REIT subsidiaries (each a “TRS”). In general, a TRS of the General Partner may perform additional services for tenants of the Company and generally may engage in any real estate or non-real estate related business (except for the operation or management of health care facilities or lodging facilities or the providing to any person, under a franchise, license or otherwise, rights to any brand name under which any lodging facility or health care facility is operated). A TRS is subject to corporate federal income tax. The General Partner has conducted business through its TRS entities for certain property management, development, construction and other related services, as well as to hold a joint venture interest in a hotel and other matters. The deferred tax asset balance at December 31, 2020 amounted to $ 16.2 million which has been fully reserved through a valuation allowance. New tax reform legislation enacted in late 2017 reduced the corporate tax rate to 21 percent, effective January 1, 2018. Consequently, the Company’s deferred tax assets were re-measured to reflect the reduction in the future U.S. corporate income tax rate as of the enactment date. As a result, the Company recorded a decrease related to its deferred tax assets of $ 5.3 million and a decrease to the associated valuation allowance of $ 5.3 million at December 31, 2017. If the General Partner fails to qualify as a REIT in any taxable year, the Company will be subject to federal income tax on its taxable income at regular corporate tax rates. The Company is subject to certain state and local taxes. Pursuant to the amended provisions related to uncertain tax provisions of ASC 740, Income Taxes, the Company recognized no material adjustments regarding its tax accounting treatment. The Company expects to recognize interest and penalties related to uncertain tax positions, if any, as income tax expense, which is included in general and administrative expense. In the normal course of business, the Company or one of its subsidiaries is subject to examination by federal, state and local jurisdictions in which it operates, where applicable. As of December 31, 2020, the tax years that remain subject to examination by the major tax jurisdictions under the statute of limitations are generally from the year 2016 forward. Earnings Per Share or Unit The Company presents both basic and diluted earnings per share or unit (“EPS or EPU”). Basic EPS or EPU excludes dilution and is computed by dividing net income available to common shareholders or unitholders by the weighted average number of shares or units outstanding for the period. Diluted EPS or EPU reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock, where such exercise or conversion would result in a lower EPS or EPU from continuing operations amount. Shares or units whose issuance is contingent upon the satisfaction of certain conditions shall be considered outstanding and included in the computation of diluted EPS or EPU as follows (i) if all necessary conditions have been satisfied by the end of the period (the events have occurred), those shares or units shall be included as of the beginning of the period in which the conditions were satisfied (or as of the date of the grant, if later) or (ii) if all necessary conditions have not been satisfied by the end of the period, the number of contingently issuable shares or units included in diluted EPS or EPU shall be based on the number of shares or units, if any, that would be issuable if the end of the reporting period were the end of the contingency period (for example, the number of shares or units that would be issuable based on current period earnings or period-end market price) and if the result would be dilutive. Those contingently issuable shares or units shall be included in the denominator of diluted EPS or EPU as of the beginning of the period (or as of the date of the grant, if later). Dividends and Distributions Payable On September 30, 2020, the Company announced that its Board of Directors was suspending its common dividends and distributions attributable to the third and fourth quarters 2020. As the Company’s management estimated that as of September 2020 it had satisfied its dividends obligations as a REIT on taxable income expected for 2020, the Board made the strategic decision to suspend its common dividends and distributions for the remainder of 2020 in an effort to provide greater financial flexibility during the pandemic and to retain incremental capital to support leasing initiatives at its Harborside commercial office properties on the Jersey City waterfront. The dividends and distributions payable at December 31, 2020 represent amounts payable on unvested LTIP units. The dividends and distributions payable at December 31, 2019 represents dividends payable to common shareholders ( 90,595,197 shares) and distributions payable to noncontrolling interests unitholders of the Operating Partnership ( 9,488,794 common units and 1,949,601 vested and unvested LTIP units) for all such holders of record as of January 3, 2020 with respect to the fourth quarter 2019. The fourth quarter 2019 common stock dividends and unit distributions of $ 0.20 per common share (total of $ 18.1 million), common unit (total of $ 1.9 million) and LTIP unit (total of $ 0.4 million) were approved by the General Partner’s Board of Directors on December 17, 2019 and paid on January 10, 2020 . The Company has determined that the $ 0.60 dividend per common share paid during the year ended December 31, 2020 represented approximately 19 percent ordinary income and approximately 81 percent capital gain; the $ 0.80 dividend per common share paid during the year ended December 31, 2019 represented 100 percent capital gain and the $ 0.80 dividend per common share paid during the year ended December 31, 2018 represented approximately 47 percent ordinary income and approximately 53 percent capital gain. Costs Incurred For Stock Issuances Costs incurred in connection with the Company’s stock issuances are reflected as a reduction of additional paid - in capital. Stock Compensation The Company accounts for stock compensation in accordance with the provisions of ASC 718, Compensation-Stock Compensation. These provisions require that the estimated fair value of restricted stock (“Restricted Stock Awards”), performance share units, long term incentive plan awards and stock options at the grant date be amortized ratably into expense over the appropriate vesting period. For unvested securities that are forfeited prior to the measurement period being complete, the Company elected to account for forfeiture of employee awards as they occur. The Company recorded stock compensation expense of $ 7,635,000 , $ 8,161,000 and $ 6,894,000 for the years ended December 31, 2020, 2019 and 2018, respectively. Other Comprehensive Income (Loss) Other comprehensive income (loss) includes items that are recorded in equity, such as effective portions of derivatives designated as cash flow hedges or unrealized holding gains or losses on marketable securities available for sale. Redeemable Noncontrolling Interests The Company evaluates the terms of the partnership units issued in accordance with the FASB’s Distinguis

Recent Transactions

Recent Transactions	12 Months Ended
	Dec. 31, 2020
Recent Transactions [Line Items]
Recent Transactions	3. RECENT TRANSACTIONS Acquisitions 2020 There were no acquisitions of property during 2020. See below for the acquisition of additional interests in property that resulted in the full consolidation of one property. 2019 The Company acquired the following rental properties (which were determined to be asset acquisitions in accordance with ASU 2017-01) during the year ended December 31, 2019 (dollars in thousands) : Rentable Acquisition Property # of Square Feet/ Acquisition Date Property Address Location Type Bldgs. Apartment Units Cost 02/06/19 99 Wood Avenue (a) Iselin, New Jersey Office 1 271,988 $ 61,858 04/01/19 Soho Lofts (a) Jersey City, New Jersey Multi-family 1 377 264,578 09/26/19 Liberty Towers (b) Jersey City, New Jersey Multi-family 1 648 410,483 Total Acquisitions 3 $ 736,919 (a) This acquisition was funded using funds available with the Company's qualified intermediary from prior property sales proceeds and through borrowing under the Company's unsecured revolving credit facility. (b) This acquisition was funded through borrowings under the Company's unsecured revolving credit facility and a new $ 232 million mortgage loan collateralized by the property. The acquisition costs were allocated to the net assets acquired, as follows (in thousands): 99 Wood Avenue Soho Lofts Apartments Liberty Towers Total Land and leasehold interest $ 9,261 $ 27,601 $ 66,670 $ 103,532 Buildings and improvements and other assets 45,576 231,663 330,935 608,174 Above market lease values 431 (a) - 56 (c) 487 In-place lease values 8,264 (a) 5,480 (b) 13,462 (c) 27,206 63,532 264,744 411,123 739,399 Less: Below market lease values ( 1,674 ) (a) ( 166 ) (b) ( 640 ) (c) ( 2,480 ) Net assets recorded upon acquisition $ 61,858 $ 264,578 $ 410,483 $ 736,919 (a) Above market, in-place and below market lease values are being amortized over a weighted-average term of 4.3 years. (b) In-place and below market lease values are being amortized over a weighted-average term of 0.8 years. (c) Above market, in-place and below market lease values are being amortized over a weighted-average term of 0.5 years. On May 10, 2019, the Company completed the acquisition of unimproved land parcels for future development (“107 Morgan”) located in Jersey City, New Jersey for approximately $ 67.2 million. The 107 Morgan acquisition was funded using funds available with the Company’s qualified intermediary from prior property sales proceeds, and through borrowing under the Company’s unsecured revolving credit facility. The Company’s mortgage receivable of $ 46.1 million with the seller was repaid in full to the Company at closing. Properties Commencing Initial Operations The following properties commenced initial operations during the years ended December 31, 2020 and 2019 ( dollars in thousands ): 2020 Total In Service Property # of Development Date Property Location Type Apartment Units Costs Incurred 03/01/20 Emery at Overlook Ridge Malden, MA Multi-Family 326 $ 103,993 Totals 326 $ 103,993 2019 # of Total In Service Property Apartment Units/ Development Date Property Location Type Rooms Costs Incurred 07/09/19 Autograph Collection By Marriott (Phase II) Weehawken, NJ Hotel 208 $ 105,477 Totals 208 $ 105,477 Consolidations 2020 On March 12, 2020, the Company, acquired its equity partner's 80 percent interest in Port Imperial North Retail L.L.C., a ground floor retail space totaling 30,745 square feet located at Port Imperial, West New York, New Jersey for $ 13.3 million in cash (funded through borrowing under the Company’s unsecured credit facility.) The results of the transaction increased the Company’s interest to 100 percent. Upon the acquisition, the Company consolidated the joint venture, a voting interest entity. As an acquisition of the remaining interests in the venture which owns the Port Imperial North Retail L.L.C., the Company accounted for the transaction as an asset acquisition under a cost accumulation model, and as such no gain on change of control of interest was recognized in consolidation, resulting in total consolidated net assets of $ 15.0 million, which are allocated as follows: Port Imperial North Retail L.L.C. Land and leasehold interests $ 4,305 Buildings and improvements and other assets, net 8,912 In-place lease values (a) 1,503 Above/Below market lease value, net (a) 313 Net assets recorded upon consolidation $ 15,033 (a) In-place and below market lease values are being amortized over a weighted-average term of 7.5 years. 2019 On January 31, 2019, the Company, which held a 24.27 percent subordinated interest in the unconsolidated joint venture, Marbella Tower Urban Renewal Associates South LLC, a 311 -unit multi-family operating property located in Jersey City, New Jersey, acquired its equity partner’s 50 percent preferred controlling interest for $ 77.5 million in cash. The property was subject to a mortgage loan that had a principal balance of $ 74.7 million. The acquisition was funded primarily using available cash. Concurrently with the closing, the joint venture repaid in full the property’s $ 74.7 million mortgage loan and obtained a new loan collateralized by the property in the amount of $ 117 million, which bears interest at 4.2 percent and matures in August 2026 . The Company received $ 43.3 million in distribution from the loan proceeds which was used to acquire the equity partner’s 50 percent interest. As the result of the acquisition, the Company increased its ownership of the property from a 24.27 percent subordinated interest to a 74.27 percent controlling interest. In accordance with ASC 810, Consolidation, the Company evaluated the acquisition and determined that the entity meets the criteria of a VIE. As such, the Company consolidated the asset upon acquisition and accordingly, remeasured its equity interests, as required by the FASB’s consolidation guidance, at fair value (based upon the income approach using current rental rates and market cap rates and discount rates). As a result, the Company recorded a gain on change of control of interests of $ 13.8 million (a non-cash item) in the year ended December 31, 2019, in which the Company accounted for the transaction as a VIE that is not a business in accordance with ASC 810-10-30-4. Additional non-cash items included in the acquisition were the Company’s carrying value of its interest in the joint venture of $ 15.3 million and the noncontrolling interest’s fair value of $ 13.7 million. See Note 9: Mortgages, Loans Payable and Other Obligations. Marbella II Land and leasehold interests $ 36,595 Buildings and improvements and other assets, net 153,974 In-place lease values (a) 4,611 Less: Below market lease values (a) ( 80 ) 195,100 Less: Debt ( 117,000 ) Net assets 78,100 Less: Noncontrolling interests ( 13,722 ) Net assets recorded upon consolidation $ 64,378 (a) In-place and below market lease values are being amortized over a weighted-average term of 6.2 months. Real Estate Held for Sale/Discontinued Operations/Dispositions 2020 On December 19, 2019, the Company announced that its Board had determined to sell the Company’s entire suburban New Jersey office portfolio totaling approximately 6.6 million square feet, which excludes the Company’s office properties in Jersey City and Hoboken, New Jersey, (collectively, the “Suburban Office Portfolio”). As the decision to sell the Suburban Office Portfolio represented a strategic shift in the Company’s operations, these properties’ results (other than a property classified as held for sale) are being classified as discontinued operations for all periods presented herein. As of December 31, 2020, the Company determined that a 350,000 square foot office property in the Suburban Office Portfolio, located in Holmdel, New Jersey no longer met the held for sale criteria. The property had originally been classified as held for sale as of December 31, 2019. The reclassified property has an aggregate book value of $ 19.8 million as of December 31, 2020, net of accumulated depreciation of $ 10.5 million (including catch-up depreciation). $ 2.8 million of previously recorded valuation allowance was reversed upon the reclassification of the asset from held for sale at December 31, 2020, and the corresponding property’s results and valuation allowance are also reclassified out of discontinued operations to continuing operations for all periods presented. See Note 7: Discontinued Operations. In late 2019 through December 31, 2020, the Company completed the sale of 20 of these suburban office properties, totaling 3.2 million square feet, for net sales proceeds of $ 377.4 million. As of December 31, 2020, the Company has identified as held for sale 16 office properties (comprised of six identified disposal groups) in the Suburban Office Portfolio, totaling 3.0 million square feet (of which the Company currently has 15 properties totaling 2.8 million square feet under contract for sale for aggregate gross proceeds of $ 652.4 million). As a result of a signed contract to dispose of a portfolio of four of the properties in an identified disposal group of assets held for sale, the Company may need to pay for significant costs to defease the mortgage loan encumbering the properties, which will be expensed when incurred at the time of such defeasance. See Note 10: Mortgages, loans payable and other obligations. I n January 2021, the Company completed the sale of one of the properties held for sale, which was a 149,600 square foot office property, for a gross sales price of $ 38 million. See Note 7: Discontinued Operations. The Company plans to complete the sale of substantially all of its remaining Suburban Office Portfolio properties in 2021, and to use the available sales proceeds to pay down its corporate-level, unsecured indebtedness. However, the Company cannot predict whether or to what extent the timing of these sales and the expected amount may be impacted by the ongoing coronavirus pandemic (“COVID-19”). After the completion of the Suburban Office Portfolio sales, the Company’s holdings will consist of its waterfront class A office portfolio and its multi-family rental portfolio, and related development projects and land holdings. Additionally, the Company also identified a retail pad leased to others and several developable land parcels as held for sale as of December 31, 2020. The properties are located in Parsippany, Madison, Short Hills, Edison and Red Bank, New Jersey. As a result of recent sales contract amendments and after considering the current market conditions as a result of the challenging economic climate with the current worldwide COVID-19 pandemic, the Company determined that the carrying value of six of the remaining held for sale properties (comprised of three disposal groups), and several land parcels held for sale was not expected to be recovered from estimated net sales proceeds, and accordingly, during the year ended December 31, 2020, recognized an unrealized loss allowance of $ 15.7 million for the properties ($ 14 million of which are from discontinued operations), respectively, and also recorded land and other impairments of $ 9.5 million. As of December 31, 2020, the Company determined that two developable land parcels located in Parsippany, New Jersey were no longer being held for sale. The properties had originally been classified as held for sale as of December 31, 2019. The reclassified properties had an aggregate book value of $ 11.3 million. The following table summarizes the real estate held for sale, net, and other assets and liabilities (dollars in thousands) : Suburban Other Office Assets Portfolio (a) Held for Sale Total Land $ 87,815 $ 76,396 $ 164,211 Building & Other 737,669 42,202 779,871 Less: Accumulated depreciation ( 161,040 ) ( 7,991 ) ( 169,031 ) Less: Cumulative unrealized losses on property held for sale ( 77,357 ) ( 40,731 ) ( 118,088 ) Real estate held for sale, net $ 587,087 $ 69,876 $ 656,963 Suburban Other Office Assets Other assets and liabilities Portfolio (a) Held for Sale Total Unbilled rents receivable, net (b) $ 17,216 $ 2,102 $ 19,318 Deferred charges, net (b) 15,320 661 15,981 Total intangibles, net (b) 26,069 - 26,069 Total deferred charges & other assets, net 42,513 665 43,178 Mortgages & loans payable, net (b) 123,768 - 123,768 Total below market liability (b) 6,538 - 6,538 Accounts payable, accrued exp & other liability 16,972 80 17,052 Unearned rents/deferred rental income (b) 8,422 217 8,639 (a) Classified as discontinued operations at December 31, 2020 for all periods presented. See Note 7: Discontinued Operations. (b) Expected to be removed with the completion of the sales. The Company disposed of the following rental properties during the year ended December 31, 2020 (dollars in thousands) : Discontinued Operations: Realized Realized Gains Gains Rentable Net Net (losses)/ (losses)/ Disposition # of Square Property Sales Carrying Unrealized Unrealized Date Property/Address Location Bldgs. Feet/Units Type Proceeds Value Losses, net Losses, net 03/17/20 One Bridge Plaza Fort Lee, New Jersey 1 200,000 Office $ 35,065 $ 17,743 $ - $ 17,322 07/22/20 3 Giralda Farms (a) Madison, New Jersey 1 141,000 Office 7,510 9,534 - ( 2,024 ) 09/15/20 Morris portfolio (b) Parsippany and Madison, New Jersey 10 1,448,420 Office 155,116 175,772 - ( 20,656 ) 09/18/20 325 Columbia Turnpike Florham Park, New Jersey 1 168,144 Office 24,276 8,020 - 16,256 09/24/20 9 Campus Drive (c) Parsippany, New Jersey 1 156,945 Office 20,678 22,162 - ( 1,484 ) 10/21/20 3&5 Vaughn Drive Princeton, New Jersey 1 98,500 Office 7,282 5,754 - 1,528 11/18/20 7 Campus Drive (d) Parsippany, New Jersey 1 154,395 Office 12,278 11,804 - 474 12/03/20 581 Main Street Woodbridge, New Jersey 1 200,000 Office 58,400 43,113 - 15,287 12/22/20 500 College Road (e) Princeton, New Jersey 1 158,235 Office 4,582 6,044 - ( 1,462 ) 12/23/20 5/10 Dennis St and and 100 Hiram Sq New Brunswick, New Jersey 2 200 units Multi-Family 45,567 38,404 7,163 - Sub-total 20 2,725,639 370,754 338,350 7,163 25,241 Unrealized losses on real estate held for sale ( 1,682 ) ( 14,040 ) Totals 20 2,725,639 $ 370,754 $ 338,350 $ 5,481 $ 11,201 (a) The Company recorded valuation allowances of $ 2.0 million on the held for sale property during the year ended December 31, 2020 and of $ 16.7 million during the year ended December 31, 2019. (b) The Company recorded valuation allowances of $ 21.6 million on the held for sale properties during the year ended December 31, 2020 and of $ 32.5 million during the year ended December 31, 2019. (c) The Company recorded a valuation allowance of $ 3.5 million on this property during the year ended December 31, 2019. (d) The Company recorded valuation allowance of $ 6.0 million on the held for sale property during the year ended December 31, 2019. (e) The Company recorded valuation allowance of $ 1.9 million on the held for sale property during the year ended December 31, 2020. The Company disposed of the following developable land holdings during the year ended December 31, 2020 (dollars in thousands): Realized Gains Net Net (losses)/ Disposition Sales Carrying Unrealized Date Property Address Location Proceeds Value Losses, net 01/03/20 230 & 250 Half Mile Road Middletown, New Jersey $ 7,018 $ 2,969 $ 4,049 03/27/20 Capital Office Park land Greenbelt, Maryland 8,974 8,210 764 12/18/20 14 & 16 Skyline Drive Mount Pleasant, New York 2,925 1,951 974 Totals $ 18,917 $ 13,130 $ 5,787 2019 On December 19, 2019, the Company announced that, based on the recommendations of the Shareholder Value Committee, its Board had determined to sell the Suburban Office Portfolio. As the decision to sell the Suburban Office Portfolio represented a strategic shift in the Company’s operations, the portfolio’s results are being classified as discontinued operations for all periods presented herein. See Note 7: Discontinued Operations. During the year ended December 31, 2019, the Company completed the sale of two of these suburban office properties, totaling 497,000 square feet, for net sales proceeds of $ 52.2 million. As of December 31, 2019, the Company identified as held for sale the remaining 35 office properties (comprised of 12 identified disposal groups) in the Suburban Office Portfolio, totaling 6.1 million square feet. See Note 7: Discontinued Operations. Additionally, the Company also identified a retail pad leased to others and several developable land parcels as held for sale as of December 31, 2019. The properties are located in Fort Lee, Parsippany, Madison, Short Hills, Edison, Red Bank and Florham Park. The Company determined that the carrying value of 21 of the properties (comprised of six disposal groups) and several land parcels held for sale was not expected to be recovered from estimated net sales proceeds, and accordingly, during the year ended December 31, 2019, recognized an unrealized loss allowance of $ 174.1 million ($ 137.9 million of which are from discontinued operations, for the properties and land and other impairments of $ 32.4 million. The following table summarizes the real estate held for sale, net, and other assets and liabilities (dollars in thousands) : Suburban Other Office Assets Portfolio (a) Held for Sale Total Land $ 147,590 $ 87,663 $ 235,253 Building & Other 1,263,738 54,392 1,318,130 Less: Accumulated depreciation ( 401,212 ) ( 11,573 ) ( 412,785 ) Less: Cumulative unrealized losses on property held for sale ( 137,876 ) ( 36,225 ) ( 174,101 ) Real estate held for sale, net $ 872,240 $ 94,257 $ 966,497 Suburban Other Office Assets Other assets and liabilities Portfolio (a) Held for Sale Total Unbilled rents receivable, net (b) $ 30,188 $ 1,956 $ 32,144 Deferred charges, net (b) 32,900 1,432 34,332 Total intangibles, net (b) 33,095 - 33,095 Total deferred charges & other assets, net 68,684 1,730 70,414 Mortgages & loans payable, net (b) 123,650 - 123,650 Total below market liability (b) 8,833 - 8,833 Accounts payable, accrued exp & other liability 21,025 1,792 22,817 Unearned rents/deferred rental income (b) 2,952 - 2,952 (a) Classified as discontinued operations at December 31, 2019 for all periods presented. See Note 7: Discontinued Operations. (b) Expected to be removed with the completion of the sales. The Company disposed of the following rental properties during the year ended December 31, 2019 (dollars in thousands): Discontinued Operations: Realized Realized Gains Gains Rentable Net Net (losses)/ (losses)/ Disposition # of Square Property Sales Carrying Unrealized Unrealized Date Property/Address Location Bldgs. Feet/Units Type Proceeds Value Losses, net Losses, net 01/11/19 721 Route 202-206 South (a) Bridgewater, New Jersey 1 192,741 Office $ 5,651 $ 5,410 $ 241 $ - 01/16/19 Park Square Apartments (b) Rahway, New Jersey 1 159 units Multi-family 34,045 34,032 13 - 01/22/19 2115 Linwood Avenue Fort Lee, New Jersey 1 68,000 Office 15,197 7,433 7,764 - 02/27/19 201 Littleton Road (c) Morris Plains, New Jersey 1 88,369 Office 4,842 4,937 ( 95 ) - 03/13/19 320 & 321 University Avenue Newark, New Jersey 2 147,406 Office 25,552 18,456 7,096 - 03/29/19 Flex portfolio (d) New York and Connecticut 56 3,148,512 Office/Flex 470,348 214,758 255,590 - 06/18/19 650 From Road (e) Paramus, New Jersey 1 348,510 Office 37,801 40,046 ( 2,245 ) - 10/18/19 3600 Route 66 (h) Neptune, New Jersey 1 180,000 Office 25,237 17,246 - 7,991 10/23/19 Chase & Alterra Portfolio (f) Revere and Malden, Massachusetts 3 1,386 units Multi-family 406,817 293,030 113,787 - 12/06/19 5 Wood Hollow Road (g) (h) Parsippany, New Jersey 1 317,040 Office 26,937 33,226 - ( 6,289 ) (i) Sub-total 68 4,490,578 1,052,427 668,574 382,151 1,702 Unrealized losses on real estate held for sale ( 39,049 ) ( 135,052 ) (i) Totals 68 4,490,578 $ 1,052,427 $ 668,574 $ 343,102 $ ( 133,350 ) (a) The Company recorded a valuation allowance of $ 9.3 million on this property during the year ended December 31, 2018. (b) The Company recorded a valuation allowance of $ 6.3 million on this property during the year ended December 31, 2018. (c) The Company recorded a valuation allowance of $ 3.6 million on this property during the year ended December 31, 2018. (d) As part of the consideration from the buyer, who is a noncontrolling interest unitholder of the Operating Partnership, 301,638 Common Units were redeemed by the Company at fair market value of $ 6.6 million as purchase consideration received for two of the properties disposed of in this transaction, which was a non-cash portion of this sales transaction. The Company used the net cash received at closing to repay approximately $ 119.9 million of borrowings under the unsecured revolving credit facility and to repay $ 90 million of its $ 350 million unsecured term loan. The Company also utilized $ 217.4 million of these proceeds on April 1, 2019 to acquire a 377 -unit multi-family property located in Jersey City, New Jersey. (e) The Company recorded a valuation allowance of $ 0.9 million on this property during the year ended December 31, 2018. (f) Proceeds from the sale, which were net of $ 235.8 million of in-place mortgages assumed by the buyer, were used primarily to repay outstanding borrowings under the Company's revolving credit facility that were drawn to fund a portion of the Company's purchase of Liberty Towers. The assumed mortgages were a non-cash portion of this sales transaction. (g) The net sale proceeds were held by a qualified intermediary, which is noncash and recorded in deferred charges, goodwill and other assets as of December 31, 2019. See Note 5: Deferred Charges, Goodwill and Other Assets, Net – to the Financial Statements. The Company recorded an impairment charge of $ 5.8 million at June 30, 2019 before the property was identified as held for sale on September 30, 2019. (h) These pertain to properties classified as discontinued operations. (See Note 7: Discontinued Operations – to the Financial Statements) (i) These include impairments recorded on three properties before they were classified as discontinued operations. The Company disposed of the following developable land holdings during the year ended December 31, 2019 (dollars in thousands): Realized Gains Net Net (losses)/ Disposition Sales Carrying Unrealized Date Property Address Location Proceeds Value Losses, net 04/30/19 Overlook Ridge Revere, Massachusetts $ 685 $ 415 $ 270 09/20/19 Overlook Ridge Revere, Massachusetts 1,135 839 296 11/08/19 150 Monument Street Bala Cynwd, Pennsylvania (a) 8,374 7,874 500 12/19/19 51 Washington Street Conshohocken, Pennsylvania (b) 8,189 8,732 $ ( 543 ) Totals $ 18,383 $ 17,860 $ 523 (a) The Company recorded a land impairment charge of $ 10.9 million on this land parcel during the year ended December 31, 2018. (b) The Company recorded a land impairment charge of $ 13.6 million on this land parcel during the year ended December 31, 2018. The Company recorded additional land impairment charges of $ 2.7 million on this land parcel during the year ended December 31, 2019 prior to its disposition. Impairments on Properties Held and Used 2020 The Company determined that, due to the shortening of its expected period of ownership and a s a result of the adverse effect the COVID-19 pandemic has had, and continues to have, on its hotel operations, the Company evaluated the recoverability of the carrying values of its two adjacent hotel properties and determined that it was necessary to reduce the carrying values of its two hotel assets located in Weehawken, New Jersey to their estimated fair values. One of these hotels has closed its rooms since March 2020. Accordingly, the Company recorded an impairment charge of $ 36.6 million on these hotels at September 30, 2020, which is included in property impairments on the consolidated statement of operations for the year ended December 31, 2020 . The Company also evaluated the recoverability of the carrying values of its land parcels and determined that it was necessary to reduce the carrying values of three held-and-used land parcels to their estimated fair values and recorded land and other impairment charges of $ 7.3 million for the year ended December 31, 2020. Unconsolidated Joint Venture Activity 2020 On December 31, 2020, the Crystal House Apartment Investors LLC, an unconsolidated joint venture property located in Arlington, Virginia sold its sole apartment property for an aggregate sales price of $ 376.6 million. The Company received $ 62.7 million for its share of net sale proceeds from the joint venture and realized its share of the gain on the property sale from the unconsolidated joint venture of $ 35.1 million. On December 17, 2020, the Company sold its interest in the Hillsborough 206 Holdings joint venture which owns developable land located in Hillsborough, New Jersey for a sale price of $ 2.1 million, and realized a gain on sale from unconsolidated joint ventures of $ 0.1 million. 2019 On February 28, 2019, the Company sold its interest in the Red Bank Corporate Plaza joint venture which owns an operating property located in Red Bank, New Jersey for a sales price of $ 4.2 million, and realized a gain on sale from unconsolidated joint ventures of $ 0.9 million. Rockpoint Transaction 2019 On February 27, 2017, the Company, Roseland Residential Trust (“RRT”), the Company’s subsidiary through which the Company conducts its multi-family residential real estate operations, Roseland Residential, L.P. (“RRLP”), the operating partnership through which RRT conducts all of its operations, and certain other affiliates of the Company entered into a preferred equity investment agreement (the “Original Investment Agreement”) with certain affiliates of Rockpoint Group, L.L.C. (Rockpoint Group, L.L.C. and its affiliates, collectively, “Rockpoint”). The Original Investment Agreement provided for RRT to contribute property to RRLP in exchange for common units of limited partnership interests in RRLP (the “Common Units”) and for multiple equity investments by Rockpoint in RRLP from time to time for up to an aggregate of $ 300 million of preferred units of limited partnership interests in RRLP (the “Preferred Units”). The initial closing under the Original Investment Agreement occurred on March 10, 2017 for $ 150 million of Preferred Units and the parties agreed that the Company’s contributed equity value (“RRT Contributed Equity Value”), was $ 1.23 billion at closing. During the year ended December 31, 2018, a total additional amount of $ 105 million of Preferred Units were issued and sold to Rockpoint pursuant to the Original Investment Agreement. During the three months ended March 31, 2019, a total additional amount of $ 45 million of Preferred Units were issued and sold to Rockpoint pursuant to the Original Investment Agreement, which brought the Preferred Units to the full balance of $ 300 million. In addition, certain contributions of property to RRLP by RRT subsequent to the execution of the Original Investment Agreement resulted in RRT being issued approximately $ 46 million of Preferred Units and Common Units in RRLP prior to June 26, 2019. On June 26, 2019, the Company, RRT, RRLP, certain other affiliates of the Company and Rockpoint entered into an additional preferred equity investment agreement (the “Add On Investment Agreement”). The closing under the Add On Investment Agreement occurred on June 28, 2019. Pursuant to the Add On Investment Agreement, Rockpoint invested an additional $ 100 million in Preferred Units and the Company and RRT agreed to contribute to RRLP two additional properties located in Jersey City, New Jersey. The Company used the $ 100 million in proceeds received to repay outstanding borrowings under its unsecured revolving credit facility and other debt by June 30, 2019. In addition, Rockpoint has a right of first refusal to invest another $ 100 million in Preferred Units in the event RRT determines that RRLP requires additional capital prior to March 1, 2023 and, subject thereto, RRLP may issue up to approximately $ 154 million in Preferred Units to RRT or an affiliate so long as at the time of such funding RRT determines in good faith that RRLP has a valid business purpose to use such proceeds. See Note 15: Redeemable Noncontrolling Interests for additional information about the Add On Investment Agreement and the related transactions with Rockpoint. RRLP has been identified as a variable interest entity in which the Company is deemed to be the primary beneficiary. As of December 31, 2020 and December 31, 2019, the Company’s consolidated RRLP entity had total real estate assets of $ 3.0 billion and $ 2.8 billion, respectively, total other assets of $ 221.1 million and $ 273.3 million, respectively, total mortgages and loan payable of $ 1.7 billion and $ 1.4 billion, respectively, and other liabilities of $ 90.4 million and $ 115.2 million, respectively.
Mack-Cali Realty LP [Member]
Recent Transactions [Line Items]
Recent Transactions	3. RECENT TRANSACTIONS Acquisitions 2020 There were no acquisitions of property during 2020. See below for the acquisition of additional interests in property that resulted in the full consolidation of one property. 2019 The Company acquired the following rental properties (which were determined to be asset acquisitions in accordance with ASU 2017-01) during the year ended December 31, 2019 (dollars in thousands) : Rentable Acquisition Property # of Square Feet/ Acquisition Date Property Address Location Type Bldgs. Apartment Units Cost 02/06/19 99 Wood Avenue (a) Iselin, New Jersey Office 1 271,988 $ 61,858 04/01/19 Soho Lofts (a) Jersey City, New Jersey Multi-family 1 377 264,578 09/26/19 Liberty Towers (b) Jersey City, New Jersey Multi-family 1 648 410,483 Total Acquisitions 3 $ 736,919 (a) This acquisition was funded using funds available with the Company's qualified intermediary from prior property sales proceeds and through borrowing under the Company's unsecured revolving credit facility. (b) This acquisition was funded through borrowings under the Company's unsecured revolving credit facility and a new $ 232 million mortgage loan collateralized by the property. The acquisition costs were allocated to the net assets acquired, as follows (in thousands): 99 Wood Avenue Soho Lofts Apartments Liberty Towers Total Land and leasehold interest $ 9,261 $ 27,601 $ 66,670 $ 103,532 Buildings and improvements and other assets 45,576 231,663 330,935 608,174 Above market lease values 431 (a) - 56 (c) 487 In-place lease values 8,264 (a) 5,480 (b) 13,462 (c) 27,206 63,532 264,744 411,123 739,399 Less: Below market lease values ( 1,674 ) (a) ( 166 ) (b) ( 640 ) (c) ( 2,480 ) Net assets recorded upon acquisition $ 61,858 $ 264,578 $ 410,483 $ 736,919 (a) Above market, in-place and below market lease values are being amortized over a weighted-average term of 4.3 years. (b) In-place and below market lease values are being amortized over a weighted-average term of 0.8 years. (c) Above market, in-place and below market lease values are being amortized over a weighted-average term of 0.5 years. On May 10, 2019, the Company completed the acquisition of unimproved land parcels for future development (“107 Morgan”) located in Jersey City, New Jersey for approximately $ 67.2 million. The 107 Morgan acquisition was funded using funds available with the Company’s qualified intermediary from prior property sales proceeds, and through borrowing under the Company’s unsecured revolving credit facility. The Company’s mortgage receivable of $ 46.1 million with the seller was repaid in full to the Company at closing. Properties Commencing Initial Operations The following properties commenced initial operations during the years ended December 31, 2020 and 2019 ( dollars in thousands ): 2020 Total In Service Property # of Development Date Property Location Type Apartment Units Costs Incurred 03/01/20 Emery at Overlook Ridge Malden, MA Multi-Family 326 $ 103,993 Totals 326 $ 103,993 2019 # of Total In Service Property Apartment Units/ Development Date Property Location Type Rooms Costs Incurred 07/09/19 Autograph Collection By Marriott (Phase II) Weehawken, NJ Hotel 208 $ 105,477 Totals 208 $ 105,477 Consolidations 2020 On March 12, 2020, the Company, acquired its equity partner's 80 percent interest in Port Imperial North Retail L.L.C., a ground floor retail space totaling 30,745 square feet located at Port Imperial, West New York, New Jersey for $ 13.3 million in cash (funded through borrowing under the Company’s unsecured credit facility.) The results of the transaction increased the Company’s interest to 100 percent. Upon the acquisition, the Company consolidated the joint venture, a voting interest entity. As an acquisition of the remaining interests in the venture which owns the Port Imperial North Retail L.L.C., the Company accounted for the transaction as an asset acquisition under a cost accumulation model, and as such no gain on change of control of interest was recognized in consolidation, resulting in total consolidated net assets of $ 15.0 million, which are allocated as follows: Port Imperial North Retail L.L.C. Land and leasehold interests $ 4,305 Buildings and improvements and other assets, net 8,912 In-place lease values (a) 1,503 Above/Below market lease value, net (a) 313 Net assets recorded upon consolidation $ 15,033 (a) In-place and below market lease values are being amortized over a weighted-average term of 7.5 years. 2019 On January 31, 2019, the Company, which held a 24.27 percent subordinated interest in the unconsolidated joint venture, Marbella Tower Urban Renewal Associates South LLC, a 311 -unit multi-family operating property located in Jersey City, New Jersey, acquired its equity partner’s 50 percent preferred controlling interest for $ 77.5 million in cash. The property was subject to a mortgage loan that had a principal balance of $ 74.7 million. The acquisition was funded primarily using available cash. Concurrently with the closing, the joint venture repaid in full the property’s $ 74.7 million mortgage loan and obtained a new loan collateralized by the property in the amount of $ 117 million, which bears interest at 4.2 percent and matures in August 2026 . The Company received $ 43.3 million in distribution from the loan proceeds which was used to acquire the equity partner’s 50 percent interest. As the result of the acquisition, the Company increased its ownership of the property from a 24.27 percent subordinated interest to a 74.27 percent controlling interest. In accordance with ASC 810, Consolidation, the Company evaluated the acquisition and determined that the entity meets the criteria of a VIE. As such, the Company consolidated the asset upon acquisition and accordingly, remeasured its equity interests, as required by the FASB’s consolidation guidance, at fair value (based upon the income approach using current rental rates and market cap rates and discount rates). As a result, the Company recorded a gain on change of control of interests of $ 13.8 million (a non-cash item) in the year ended December 31, 2019, in which the Company accounted for the transaction as a VIE that is not a business in accordance with ASC 810-10-30-4. Additional non-cash items included in the acquisition were the Company’s carrying value of its interest in the joint venture of $ 15.3 million and the noncontrolling interest’s fair value of $ 13.7 million. See Note 9: Mortgages, Loans Payable and Other Obligations. Marbella II Land and leasehold interests $ 36,595 Buildings and improvements and other assets, net 153,974 In-place lease values (a) 4,611 Less: Below market lease values (a) ( 80 ) 195,100 Less: Debt ( 117,000 ) Net assets 78,100 Less: Noncontrolling interests ( 13,722 ) Net assets recorded upon consolidation $ 64,378 (a) In-place and below market lease values are being amortized over a weighted-average term of 6.2 months. Real Estate Held for Sale/Discontinued Operations/Dispositions 2020 On December 19, 2019, the Company announced that its Board had determined to sell the Company’s entire suburban New Jersey office portfolio totaling approximately 6.6 million square feet, which excludes the Company’s office properties in Jersey City and Hoboken, New Jersey, (collectively, the “Suburban Office Portfolio”). As the decision to sell the Suburban Office Portfolio represented a strategic shift in the Company’s operations, these properties’ results (other than a property classified as held for sale) are being classified as discontinued operations for all periods presented herein. As of December 31, 2020, the Company determined that a 350,000 square foot office property in the Suburban Office Portfolio, located in Holmdel, New Jersey no longer met the held for sale criteria. The property had originally been classified as held for sale as of December 31, 2019. The reclassified property has an aggregate book value of $ 19.8 million as of December 31, 2020, net of accumulated depreciation of $ 10.5 million (including catch-up depreciation). $ 2.8 million of previously recorded valuation allowance was reversed upon the reclassification of the asset from held for sale at December 31, 2020, and the corresponding property’s results and valuation allowance are also reclassified out of discontinued operations to continuing operations for all periods presented. See Note 7: Discontinued Operations. In late 2019 through December 31, 2020, the Company completed the sale of 20 of these suburban office properties, totaling 3.2 million square feet, for net sales proceeds of $ 377.4 million. As of December 31, 2020, the Company has identified as held for sale 16 office properties (comprised of six identified disposal groups) in the Suburban Office Portfolio, totaling 3.0 million square feet (of which the Company currently has 15 properties totaling 2.8 million square feet under contract for sale for aggregate gross proceeds of $ 652.4 million). As a result of a signed contract to dispose of a portfolio of four of the properties in an identified disposal group of assets held for sale, the Company may need to pay for significant costs to defease the mortgage loan encumbering the properties, which will be expensed when incurred at the time of such defeasance. See Note 10: Mortgages, loans payable and other obligations. I n January 2021, the Company completed the sale of one of the properties held for sale, which was a 149,600 square foot office property, for a gross sales price of $ 38 million. See Note 7: Discontinued Operations. The Company plans to complete the sale of substantially all of its remaining Suburban Office Portfolio properties in 2021, and to use the available sales proceeds to pay down its corporate-level, unsecured indebtedness. However, the Company cannot predict whether or to what extent the timing of these sales and the expected amount may be impacted by the ongoing coronavirus pandemic (“COVID-19”). After the completion of the Suburban Office Portfolio sales, the Company’s holdings will consist of its waterfront class A office portfolio and its multi-family rental portfolio, and related development projects and land holdings. Additionally, the Company also identified a retail pad leased to others and several developable land parcels as held for sale as of December 31, 2020. The properties are located in Parsippany, Madison, Short Hills, Edison and Red Bank, New Jersey. As a result of recent sales contract amendments and after considering the current market conditions as a result of the challenging economic climate with the current worldwide COVID-19 pandemic, the Company determined that the carrying value of six of the remaining held for sale properties (comprised of three disposal groups), and several land parcels held for sale was not expected to be recovered from estimated net sales proceeds, and accordingly, during the year ended December 31, 2020, recognized an unrealized loss allowance of $ 15.7 million for the properties ($ 14 million of which are from discontinued operations), respectively, and also recorded land and other impairments of $ 9.5 million. As of December 31, 2020, the Company determined that two developable land parcels located in Parsippany, New Jersey were no longer being held for sale. The properties had originally been classified as held for sale as of December 31, 2019. The reclassified properties had an aggregate book value of $ 11.3 million. The following table summarizes the real estate held for sale, net, and other assets and liabilities (dollars in thousands) : Suburban Other Office Assets Portfolio (a) Held for Sale Total Land $ 87,815 $ 76,396 $ 164,211 Building & Other 737,669 42,202 779,871 Less: Accumulated depreciation ( 161,040 ) ( 7,991 ) ( 169,031 ) Less: Cumulative unrealized losses on property held for sale ( 77,357 ) ( 40,731 ) ( 118,088 ) Real estate held for sale, net $ 587,087 $ 69,876 $ 656,963 Suburban Other Office Assets Other assets and liabilities Portfolio (a) Held for Sale Total Unbilled rents receivable, net (b) $ 17,216 $ 2,102 $ 19,318 Deferred charges, net (b) 15,320 661 15,981 Total intangibles, net (b) 26,069 - 26,069 Total deferred charges & other assets, net 42,513 665 43,178 Mortgages & loans payable, net (b) 123,768 - 123,768 Total below market liability (b) 6,538 - 6,538 Accounts payable, accrued exp & other liability 16,972 80 17,052 Unearned rents/deferred rental income (b) 8,422 217 8,639 (a) Classified as discontinued operations at December 31, 2020 for all periods presented. See Note 7: Discontinued Operations. (b) Expected to be removed with the completion of the sales. The Company disposed of the following rental properties during the year ended December 31, 2020 (dollars in thousands) : Discontinued Operations: Realized Realized Gains Gains Rentable Net Net (losses)/ (losses)/ Disposition # of Square Property Sales Carrying Unrealized Unrealized Date Property/Address Location Bldgs. Feet/Units Type Proceeds Value Losses, net Losses, net 03/17/20 One Bridge Plaza Fort Lee, New Jersey 1 200,000 Office $ 35,065 $ 17,743 $ - $ 17,322 07/22/20 3 Giralda Farms (a) Madison, New Jersey 1 141,000 Office 7,510 9,534 - ( 2,024 ) 09/15/20 Morris portfolio (b) Parsippany and Madison, New Jersey 10 1,448,420 Office 155,116 175,772 - ( 20,656 ) 09/18/20 325 Columbia Turnpike Florham Park, New Jersey 1 168,144 Office 24,276 8,020 - 16,256 09/24/20 9 Campus Drive (c) Parsippany, New Jersey 1 156,945 Office 20,678 22,162 - ( 1,484 ) 10/21/20 3&5 Vaughn Drive Princeton, New Jersey 1 98,500 Office 7,282 5,754 - 1,528 11/18/20 7 Campus Drive (d) Parsippany, New Jersey 1 154,395 Office 12,278 11,804 - 474 12/03/20 581 Main Street Woodbridge, New Jersey 1 200,000 Office 58,400 43,113 - 15,287 12/22/20 500 College Road (e) Princeton, New Jersey 1 158,235 Office 4,582 6,044 - ( 1,462 ) 12/23/20 5/10 Dennis St and and 100 Hiram Sq New Brunswick, New Jersey 2 200 units Multi-Family 45,567 38,404 7,163 - Sub-total 20 2,725,639 370,754 338,350 7,163 25,241 Unrealized losses on real estate held for sale ( 1,682 ) ( 14,040 ) Totals 20 2,725,639 $ 370,754 $ 338,350 $ 5,481 $ 11,201 (a) The Company recorded valuation allowances of $ 2.0 million on the held for sale property during the year ended December 31, 2020 and of $ 16.7 million during the year ended December 31, 2019. (b) The Company recorded valuation allowances of $ 21.6 million on the held for sale properties during the year ended December 31, 2020 and of $ 32.5 million during the year ended December 31, 2019. (c) The Company recorded a valuation allowance of $ 3.5 million on this property during the year ended December 31, 2019. (d) The Company recorded valuation allowance of $ 6.0 million on the held for sale property during the year ended December 31, 2019. (e) The Company recorded valuation allowance of $ 1.9 million on the held for sale property during the year ended December 31, 2020. The Company disposed of the following developable land holdings during the year ended December 31, 2020 (dollars in thousands): Realized Gains Net Net (losses)/ Disposition Sales Carrying Unrealized Date Property Address Location Proceeds Value Losses, net 01/03/20 230 & 250 Half Mile Road Middletown, New Jersey $ 7,018 $ 2,969 $ 4,049 03/27/20 Capital Office Park land Greenbelt, Maryland 8,974 8,210 764 12/18/20 14 & 16 Skyline Drive Mount Pleasant, New York 2,925 1,951 974 Totals $ 18,917 $ 13,130 $ 5,787 2019 On December 19, 2019, the Company announced that, based on the recommendations of the Shareholder Value Committee, its Board had determined to sell the Suburban Office Portfolio. As the decision to sell the Suburban Office Portfolio represented a strategic shift in the Company’s operations, the portfolio’s results are being classified as discontinued operations for all periods presented herein. See Note 7: Discontinued Operations. During the year ended December 31, 2019, the Company completed the sale of two of these suburban office properties, totaling 497,000 square feet, for net sales proceeds of $ 52.2 million. As of December 31, 2019, the Company identified as held for sale the remaining 35 office properties (comprised of 12 identified disposal groups) in the Suburban Office Portfolio, totaling 6.1 million square feet. See Note 7: Discontinued Operations. Additionally, the Company also identified a retail pad leased to others and several developable land parcels as held for sale as of December 31, 2019. The properties are located in Fort Lee, Parsippany, Madison, Short Hills, Edison, Red Bank and Florham Park. The Company determined that the carrying value of 21 of the properties (comprised of six disposal groups) and several land parcels held for sale was not expected to be recovered from estimated net sales proceeds, and accordingly, during the year ended December 31, 2019, recognized an unrealized loss allowance of $ 174.1 million ($ 137.9 million of which are from discontinued operations, for the properties and land and other impairments of $ 32.4 million. The following table summarizes the real estate held for sale, net, and other assets and liabilities (dollars in thousands) : Suburban Other Office Assets Portfolio (a) Held for Sale Total Land $ 147,590 $ 87,663 $ 235,253 Building & Other 1,263,738 54,392 1,318,130 Less: Accumulated depreciation ( 401,212 ) ( 11,573 ) ( 412,785 ) Less: Cumulative unrealized losses on property held for sale ( 137,876 ) ( 36,225 ) ( 174,101 ) Real estate held for sale, net $ 872,240 $ 94,257 $ 966,497 Suburban Other Office Assets Other assets and liabilities Portfolio (a) Held for Sale Total Unbilled rents receivable, net (b) $ 30,188 $ 1,956 $ 32,144 Deferred charges, net (b) 32,900 1,432 34,332 Total intangibles, net (b) 33,095 - 33,095 Total deferred charges & other assets, net 68,684 1,730 70,414 Mortgages & loans payable, net (b) 123,650 - 123,650 Total below market liability (b) 8,833 - 8,833 Accounts payable, accrued exp & other liability 21,025 1,792 22,817 Unearned rents/deferred rental income (b) 2,952 - 2,952 (a) Classified as discontinued operations at December 31, 2019 for all periods presented. See Note 7: Discontinued Operations. (b) Expected to be removed with the completion of the sales. The Company disposed of the following rental properties during the year ended December 31, 2019 (dollars in thousands): Discontinued Operations: Realized Realized Gains Gains Rentable Net Net (losses)/ (losses)/ Disposition # of Square Property Sales Carrying Unrealized Unrealized Date Property/Address Location Bldgs. Feet/Units Type Proceeds Value Losses, net Losses, net 01/11/19 721 Route 202-206 South (a) Bridgewater, New Jersey 1 192,741 Office $ 5,651 $ 5,410 $ 241 $ - 01/16/19 Park Square Apartments (b) Rahway, New Jersey 1 159 units Multi-family 34,045 34,032 13 - 01/22/19 2115 Linwood Avenue Fort Lee, New Jersey 1 68,000 Office 15,197 7,433 7,764 - 02/27/19 201 Littleton Road (c) Morris Plains, New Jersey 1 88,369 Office 4,842 4,937 ( 95 ) - 03/13/19 320 & 321 University Avenue Newark, New Jersey 2 147,406 Office 25,552 18,456 7,096 - 03/29/19 Flex portfolio (d) New York and Connecticut 56 3,148,512 Office/Flex 470,348 214,758 255,590 - 06/18/19 650 From Road (e) Paramus, New Jersey 1 348,510 Office 37,801 40,046 ( 2,245 ) - 10/18/19 3600 Route 66 (h) Neptune, New Jersey 1 180,000 Office 25,237 17,246 - 7,991 10/23/19 Chase & Alterra Portfolio (f) Revere and Malden, Massachusetts 3 1,386 units Multi-family 406,817 293,030 113,787 - 12/06/19 5 Wood Hollow Road (g) (h) Parsippany, New Jersey 1 317,040 Office 26,937 33,226 - ( 6,289 ) (i) Sub-total 68 4,490,578 1,052,427 668,574 382,151 1,702 Unrealized losses on real estate held for sale ( 39,049 ) ( 135,052 ) (i) Totals 68 4,490,578 $ 1,052,427 $ 668,574 $ 343,102 $ ( 133,350 ) (a) The Company recorded a valuation allowance of $ 9.3 million on this property during the year ended December 31, 2018. (b) The Company recorded a valuation allowance of $ 6.3 million on this property during the year ended December 31, 2018. (c) The Company recorded a valuation allowance of $ 3.6 million on this property during the year ended December 31, 2018. (d) As part of the consideration from the buyer, who is a noncontrolling interest unitholder of the Operating Partnership, 301,638 Common Units were redeemed by the Company at fair market value of $ 6.6 million as purchase consideration received for two of the properties disposed of in this transaction, which was a non-cash portion of this sales transaction. The Company used the net cash received at closing to repay approximately $ 119.9 million of borrowings under the unsecured revolving credit facility and to repay $ 90 million of its $ 350 million unsecured term loan. The Company also utilized $ 217.4 million of these proceeds on April 1, 2019 to acquire a 377 -unit multi-family property located in Jersey City, New Jersey. (e) The Company recorded a valuation allowance of $ 0.9 million on this property during the year ended December 31, 2018. (f) Proceeds from the sale, which were net of $ 235.8 million of in-place mortgages assumed by the buyer, were used primarily to repay outstanding borrowings under the Company's revolving credit facility that were drawn to fund a portion of the Company's purchase of Liberty Towers. The assumed mortgages were a non-cash portion of this sales transaction. (g) The net sale proceeds were held by a qualified intermediary, which is noncash and recorded in deferred charges, goodwill and other assets as of December 31, 2019. See Note 5: Deferred Charges, Goodwill and Other Assets, Net – to the Financial Statements. The Company recorded an impairment charge of $ 5.8 million at June 30, 2019 before the property was identified as held for sale on September 30, 2019. (h) These pertain to properties classified as discontinued operations. (See Note 7: Discontinued Operations – to the Financial Statements) (i) These include impairments recorded on three properties before they were classified as discontinued operations. The Company disposed of the following developable land holdings during the year ended December 31, 2019 (dollars in thousands): Realized Gains Net Net (losses)/ Disposition Sales Carrying Unrealized Date Property Address Location Proceeds Value Losses, net 04/30/19 Overlook Ridge Revere, Massachusetts $ 685 $ 415 $ 270 09/20/19 Overlook Ridge Revere, Massachusetts 1,135 839 296 11/08/19 150 Monument Street Bala Cynwd, Pennsylvania (a) 8,374 7,874 500 12/19/19 51 Washington Street Conshohocken, Pennsylvania (b) 8,189 8,732 $ ( 543 ) Totals $ 18,383 $ 17,860 $ 523 (a) The Company recorded a land impairment charge of $ 10.9 million on this land parcel during the year ended December 31, 2018. (b) The Company recorded a land impairment charge of $ 13.6 million on this land parcel during the year ended December 31, 2018. The Company recorded additional land impairment charges of $ 2.7 million on this land parcel during the year ended December 31, 2019 prior to its disposition. Impairments on Properties Held and Used 2020 The Company determined that, due to the shortening of its expected period of ownership and a s a result of the adverse effect the COVID-19 pandemic has had, and continues to have, on its hotel operations, the Company evaluated the recoverability of the carrying values of its two adjacent hotel properties and determined that it was necessary to reduce the carrying values of its two hotel assets located in Weehawken, New Jersey to their estimated fair values. One of these hotels has closed its rooms since March 2020. Accordingly, the Company recorded an impairment charge of $ 36.6 million on these hotels at September 30, 2020, which is included in property impairments on the consolidated statement of operations for the year ended December 31, 2020 . The Company also evaluated the recoverability of the carrying values of its land parcels and determined that it was necessary to reduce the carrying values of three held-and-used land parcels to their estimated fair values and recorded land and other impairment charges of $ 7.3 million for the year ended December 31, 2020. Unconsolidated Joint Venture Activity 2020 On December 31, 2020, the Crystal House Apartment Investors LLC, an unconsolidated joint venture property located in Arlington, Virginia sold its sole apartment property for an aggregate sales price of $ 376.6 million. The Company received $ 62.7 million for its share of net sale proceeds from the joint venture and realized its share of the gain on the property sale from the unconsolidated joint venture of $ 35.1 million. On December 17, 2020, the Company sold its interest in the Hillsborough 206 Holdings joint venture which owns developable land located in Hillsborough, New Jersey for a sale price of $ 2.1 million, and realized a gain on sale from unconsolidated joint ventures of $ 0.1 million. 2019 On February 28, 2019, the Company sold its interest in the Red Bank Corporate Plaza joint venture which owns an operating property located in Red Bank, New Jersey for a sales price of $ 4.2 million, and realized a gain on sale from unconsolidated joint ventures of $ 0.9 million. Rockpoint Transaction 2019 On February 27, 2017, the Company, Roseland Residential Trust (“RRT”), the Company’s subsidiary through which the Company conducts its multi-family residential real estate operations, Roseland Residential, L.P. (“RRLP”), the operating partnership through which RRT conducts all of its operations, and certain other affiliates of the Company entered into a preferred equity investment agreement (the “Original Investment Agreement”) with certain affiliates of Rockpoint Group, L.L.C. (Rockpoint Group, L.L.C. and its affiliates, collectively, “Rockpoint”). The Original Investment Agreement provided for RRT to contribute property to RRLP in exchange for common units of limited partnership interests in RRLP (the “Common Units”) and for multiple equity investments by Rockpoint in RRLP from time to time for up to an aggregate of $ 300 million of preferred units of limited partnership interests in RRLP (the “Preferred Units”). The initial closing under the Original Investment Agreement occurred on March 10, 2017 for $ 150 million of Preferred Units and the parties agreed that the Company’s contributed equity value (“RRT Contributed Equity Value”), was $ 1.23 billion at closing. During the year ended December 31, 2018, a total additional amount of $ 105 million of Preferred Units were issued and sold to Rockpoint pursuant to the Original Investment Agreement. During the three months ended March 31, 2019, a total additional amount of $ 45 million of Preferred Units were issued and sold to Rockpoint pursuant to the Original Investment Agreement, which brought the Preferred Units to the full balance of $ 300 million. In addition, certain contributions of property to RRLP by RRT subsequent to the execution of the Original Investment Agreement resulted in RRT being issued approximately $ 46 million of Preferred Units and Common Units in RRLP prior to June 26, 2019. On June 26, 2019, the Company, RRT, RRLP, certain other affiliates of the Company and Rockpoint entered into an additional preferred equity investment agreement (the “Add On Investment Agreement”). The closing under the Add On Investment Agreement occurred on June 28, 2019. Pursuant to the Add On Investment Agreement, Rockpoint invested an additional $ 100 million in Preferred Units and the Company and RRT agreed to contribute to RRLP two additional properties located in Jersey City, New Jersey. The Company used the $ 100 million in proceeds received to repay outstanding borrowings under its unsecured revolving credit facility and other debt by June 30, 2019. In addition, Rockpoint has a right of first refusal to invest another $ 100 million in Preferred Units in the event RRT determines that RRLP requires additional capital prior to March 1, 2023 and, subject thereto, RRLP may issue up to approximately $ 154 million in Preferred Units to RRT or an affiliate so long as at the time of such funding RRT determines in good faith that RRLP has a valid business purpose to use such proceeds. See Note 15: Redeemable Noncontrolling Interests for additional information about the Add On Investment Agreement and the related transactions with Rockpoint. RRLP has been identified as a variable interest entity in which the Company is deemed to be the primary beneficiary. As of December 31, 2020 and December 31, 2019, the Company’s consolidated RRLP entity had total real estate assets of $ 3.0 billion and $ 2.8 billion, respectively, total other assets of $ 221.1 million and $ 273.3 million, respectively, total mortgages and loan payable of $ 1.7 billion and $ 1.4 billion, respectively, and other liabilities of $ 90.4 million and $ 115.2 million, respectively.

Investments In Unconsolidated J

Investments In Unconsolidated Joint Ventures	12 Months Ended
	Dec. 31, 2020
Investments In Unconsolidated Joint Ventures [Line Items]
Investments In Unconsolidated Joint Ventures	4. INVESTMENTS IN UNCONSOLIDATED JOINT VENTURES As of December 31, 2020, the Company had an aggregate investment of approximately $ 162.4 million in its equity method joint ventures. The Company formed these ventures with unaffiliated third parties, or acquired interests in them, to develop or manage primarily office and multi-family rental properties, or to acquire land in anticipation of possible development of office and multi-family rental properties. As of December 31, 2020, the unconsolidated joint ventures owned: two office properties aggregating approximately 0.2 million square feet, six multi-family properties totaling 1,786 apartment units, a retail property aggregating approximately 51,000 square feet, a 351 -room hotel, a development project for up to approximately 360 apartment units; and interests and/or rights to developable land parcels able to accommodate up to 1,621 apartment units. The Company’s unconsolidated interests range from 20 percent to 85 percent subject to specified priority allocations in certain of the joint ventures. The amounts reflected in the following tables (except for the Company’s share of equity in earnings) are based on the historical financial information of the individual joint ventures. The Company does not record losses of the joint ventures in excess of its investment balances unless the Company is liable for the obligations of the joint venture or is otherwise committed to provide financial support to the joint venture. The outside basis portion of the Company’s investments in joint ventures is amortized over the anticipated useful lives of the underlying ventures’ tangible and intangible assets acquired and liabilities assumed. Unless otherwise noted below, the debt of the Company’s unconsolidated joint ventures generally is non-recourse to the Company, except for customary exceptions pertaining to such matters as intentional misuse of funds, environmental conditions, and material misrepresentations. The Company has agreed to guarantee repayment of a portion of the debt of its unconsolidated joint ventures. As of December 31, 2020, such debt had a total borrowing capacity of $ 304.0 million of which the Company agreed to guarantee up to $ 33.2 million. As of December 31, 2020, the outstanding balance of such debt totaled $ 267.6 million of which $ 29.6 million was guaranteed by the Company. The Company performed management, leasing, development and other services for the properties owned by the unconsolidated joint ventures and recognized $ 2.2 million and $ 2.4 million for such services in the years ended December 31, 2020 and 2019, respectively. The Company had $ 0.3 million and $ 0.6 million in accounts receivable due from its unconsolidated joint ventures as of December 31, 2020 and 2019. Included in the Company’s investments in unconsolidated joint ventures as of December 31, 2020 are three unconsolidated joint ventures, two of which are operating properties and one development project, which are VIEs for which the Company is not the primary beneficiary. These joint ventures are primarily established to develop real estate property for long-term investment and were deemed VIEs primarily based on the fact that the equity investment at risk was not sufficient to permit the entities to finance their activities without additional financial support. The initial equity contributed to these entities was not sufficient to fully finance the real estate construction as development costs are funded by the partners throughout the construction period. The Company determined that it was not the primary beneficiary of these VIEs based on the fact that the Company has shared control of these entities along with the entity’s partners and therefore does not have controlling financial interests in these VIEs. The Company’s aggregate investment in these VIEs was approximately $ 109.0 million as of December 31, 2020. The Company’s maximum exposure to loss as a result of its involvement with these VIEs is estimated to be approximately $ 142.2 million, which includes the Company’s current investment and estimated future funding commitments/guarantees of approximately $ 33.2 million. The Company has not provided financial support to these VIEs that it was not previously contractually required to provide. In general, future costs of development not financed through third parties will be funded with capital contributions from the Company and its outside partners in accordance with their respective ownership percentages. The following is a summary of the Company's unconsolidated joint ventures as of December 31, 2020 and 2019 (dollars in thousands): Property Debt Number of Company's Carrying Value As of December 31, 2020 Apartment Units Effective December 31, December 31, Maturity Interest Entity / Property Name or Rentable SF Ownership % (a) 2020 2019 Balance Date Rate Multi-family Metropolitan and Lofts at 40 Park (b) (c) 189 units 25.00 % $ 3,347 $ 7,257 $ 60,767 (d) (d) RiverTrace at Port Imperial 316 units 22.50 % 6,667 7,463 82,000 11/10/26 3.21 % Crystal House (e) 825 units 25.00 % - 28,823 - - - PI North - Riverwalk C (f) 360 units 40.00 % 36,992 35,527 75,569 12/06/21 L+ 2.75 % Riverpark at Harrison (g) 141 units 45.00 % 681 1,015 30,192 07/01/35 3.19 % Station House 378 units 50.00 % 34,026 35,676 95,137 07/01/33 4.82 % Urby at Harborside (h) 762 units 85.00 % 72,752 79,790 192,000 08/01/29 5.197 % PI North - Land (b) (i) 771 potential units 20.00 % 1,678 1,678 - - - Liberty Landing 850 potential units 50.00 % 337 337 - - - Hillsborough 206 (m) 160,000 sf 50.00 % - 1,962 - - - Office 12 Vreeland Road 139,750 sf 50.00 % 1,811 (j) 3,846 (j) 4,582 07/01/23 2.87 % Offices at Crystal Lake 106,345 sf 31.25 % 3,744 3,521 2,532 11/01/23 4.76 % Other Riverwalk Retail (k) 30,745 sf 20.00 % - 1,467 - - - Hyatt Regency Hotel Jersey City 351 rooms 50.00 % - - 100,000 10/01/26 3.668 % Other (l) 347 729 - - - Totals: $ 162,382 $ 209,091 $ 642,779 (a) Company's effective ownership % represents the Company's entitlement to residual distributions after payments of priority returns, where applicable. (b) The Company's ownership interests in this venture are subordinate to its partner's preferred capital balance and the Company is not expected to meaningfully participate in the venture's cash flows in the near term. (c) Through the joint venture, the Company also owns a 25 percent interest in a 50,973 square feet retail building ("Shops at 40 Park") and a 50 percent interest in a 59 -unit, five story multi-family rental property ("Lofts at 40 Park"). (d) Property debt balance consists of: (i) an interest only loan, collateralized by the Metropolitan at 40 Park, refinanced on September 18, 2020, with a balance of $ 36,500 , bears interest at LIBOR + 2.85 percent, matures in October 2023 ; (ii) an amortizable loan, collateralized by the Shops at 40 Park, with a balance of $ 6,067 , bears interest at LIBOR + 1.5 percent and matures in October 2021 ; (iii) an interest only loan, collateralized by the Lofts at 40 Park, with a balance of $ 18,200 , which bears interest at LIBOR + 1.5 percent and matures in January 2023 . (e) On December 31, 2020, the Crystal House Apartment Investors LLC, an unconsolidated joint venture property sold its sole apartment property and the Company recorded a gain of $ 35.1 million. See Note 3: Recent Transactions - Unconsolidated Joint Venture. (f) The venture has a construction loan with a maximum borrowing amount of $ 112,000 , of which the Company has guaranteed 10 percent of the principal outstanding. (g) On June 10, 2020, the loan was refinanced with a borrowing amount of $ 30,192 . (h) The Company owns an 85 percent interest with shared control over major decisions such as, approval of budgets, property financings and leasing guidelines. The Company has guaranteed $ 22 million of the principal outstanding debt. (i) The Company owns a 20 percent residual interest in undeveloped land parcels: parcels 6, I, and J that can accommodate the development of 771 apartment units. (j) At December 31, 2019, the Company evaluated the recoverability of the carrying value of certain investments in unconsolidated joint venture, being considered for sale in the short or medium term. The Company determined that due to tenant turnover, lease-up assumptions, along with the Company's plans to exit its investment, it was necessary to reduce the carrying value of the investment to its estimated fair value. Accordingly, the Company recorded an impairment charge of $ 2.6 million and $ 3.7 million at December 31, 2020 and 2019, respectively. (k) On March 12, 2020, the Company acquired its equity partner's 80 percent interest and increased ownership to 100 percent. See Note 3: Recent Transactions - Consolidation. (l) The Company owns other interests in various unconsolidated joint ventures, including interests in assets previously owned and interest in ventures whose businesses are related to its core operations. These ventures are not expected to significantly impact the Company's operations in the near term. (m) On December 17, 2020, the Company sold its interest in the joint venture for a sale price of $ 2.1 million and recorded a gain of $ 0.1 million. The following is a summary of the Company’s equity in earnings (loss) of unconsolidated joint ventures for the years ended December 31, 2020, 2019 and 2018 (dollars in thousands) : Year Ended December 31, Entity / Property Name 2020 2019 2018 Multi-family Marbella $ - $ - $ 205 Metropolitan at 40 Park ( 1,010 ) ( 422 ) ( 455 ) RiverTrace at Port Imperial 111 317 154 Crystal House ( 924 ) ( 687 ) ( 874 ) PI North - Riverwalk C / Land ( 368 ) ( 279 ) ( 126 ) Marbella II (b) - ( 15 ) 35 Riverpark at Harrison ( 273 ) ( 172 ) ( 232 ) Station House ( 1,650 ) ( 2,000 ) ( 2,096 ) Urby at Harborside 1,095 (c) 1,587 (c) ( 975 ) (c) Liberty Landing ( 5 ) - ( 5 ) Hillsborough 206 - - 16 Office Red Bank (d) - 8 ( 215 ) 12 Vreeland Road ( 2,035 ) ( 3,172 ) 285 Offices at Crystal Lake 224 79 73 Other Riverwalk Retail (e) ( 10 ) ( 72 ) ( 86 ) Hyatt Regency Hotel Jersey City 625 3,388 3,672 Other 388 121 497 Company's equity in earnings (loss) of unconsolidated joint ventures (a) $ ( 3,832 ) $ ( 1,319 ) $ ( 127 ) (a) Amounts are net of amortization of basis differences of $ 581 and $ 638 for the year ended December 31, 2020 and 2019, respectively. (b) On January 31, 2019, the Company acquired one of its equity partner's 50 percent interest and as a result, increased its ownership from 24.27 percent subordinated interest to 74.27 percent controlling interest, and ceased applying the equity method of accounting at such time. (c) Includes $ 2.6 million of the Company's share of the venture's income from its sale of an economic urban tax credit certificate from the State of New Jersey to a third party. The venture has an agreement to sell tax credits to a third party over the next seven years for $ 3 million per year for a total of $ 21 million. The sales are subject to the venture obtaining the tax credits from the State of New Jersey each year and transferring the tax credit certificate to the buyer each year. (d) On February 28, 2019, the Company sold its 50 percent interest to its partner and realized a gain of $ 0.9 million. (e) On March 12, 2020, the Company acquired its equity partner's 80 percent interest and increased ownership to 100 percent. See Note 3: Recent Transactions - Consolidation.
Mack-Cali Realty LP [Member]
Investments In Unconsolidated Joint Ventures [Line Items]
Investments In Unconsolidated Joint Ventures	4. INVESTMENTS IN UNCONSOLIDATED JOINT VENTURES As of December 31, 2020, the Company had an aggregate investment of approximately $ 162.4 million in its equity method joint ventures. The Company formed these ventures with unaffiliated third parties, or acquired interests in them, to develop or manage primarily office and multi-family rental properties, or to acquire land in anticipation of possible development of office and multi-family rental properties. As of December 31, 2020, the unconsolidated joint ventures owned: two office properties aggregating approximately 0.2 million square feet, six multi-family properties totaling 1,786 apartment units, a retail property aggregating approximately 51,000 square feet, a 351 -room hotel, a development project for up to approximately 360 apartment units; and interests and/or rights to developable land parcels able to accommodate up to 1,621 apartment units. The Company’s unconsolidated interests range from 20 percent to 85 percent subject to specified priority allocations in certain of the joint ventures. The amounts reflected in the following tables (except for the Company’s share of equity in earnings) are based on the historical financial information of the individual joint ventures. The Company does not record losses of the joint ventures in excess of its investment balances unless the Company is liable for the obligations of the joint venture or is otherwise committed to provide financial support to the joint venture. The outside basis portion of the Company’s investments in joint ventures is amortized over the anticipated useful lives of the underlying ventures’ tangible and intangible assets acquired and liabilities assumed. Unless otherwise noted below, the debt of the Company’s unconsolidated joint ventures generally is non-recourse to the Company, except for customary exceptions pertaining to such matters as intentional misuse of funds, environmental conditions, and material misrepresentations. The Company has agreed to guarantee repayment of a portion of the debt of its unconsolidated joint ventures. As of December 31, 2020, such debt had a total borrowing capacity of $ 304.0 million of which the Company agreed to guarantee up to $ 33.2 million. As of December 31, 2020, the outstanding balance of such debt totaled $ 267.6 million of which $ 29.6 million was guaranteed by the Company. The Company performed management, leasing, development and other services for the properties owned by the unconsolidated joint ventures and recognized $ 2.2 million and $ 2.4 million for such services in the years ended December 31, 2020 and 2019, respectively. The Company had $ 0.3 million and $ 0.6 million in accounts receivable due from its unconsolidated joint ventures as of December 31, 2020 and 2019. Included in the Company’s investments in unconsolidated joint ventures as of December 31, 2020 are three unconsolidated joint ventures, two of which are operating properties and one development project, which are VIEs for which the Company is not the primary beneficiary. These joint ventures are primarily established to develop real estate property for long-term investment and were deemed VIEs primarily based on the fact that the equity investment at risk was not sufficient to permit the entities to finance their activities without additional financial support. The initial equity contributed to these entities was not sufficient to fully finance the real estate construction as development costs are funded by the partners throughout the construction period. The Company determined that it was not the primary beneficiary of these VIEs based on the fact that the Company has shared control of these entities along with the entity’s partners and therefore does not have controlling financial interests in these VIEs. The Company’s aggregate investment in these VIEs was approximately $ 109.0 million as of December 31, 2020. The Company’s maximum exposure to loss as a result of its involvement with these VIEs is estimated to be approximately $ 142.2 million, which includes the Company’s current investment and estimated future funding commitments/guarantees of approximately $ 33.2 million. The Company has not provided financial support to these VIEs that it was not previously contractually required to provide. In general, future costs of development not financed through third parties will be funded with capital contributions from the Company and its outside partners in accordance with their respective ownership percentages. The following is a summary of the Company's unconsolidated joint ventures as of December 31, 2020 and 2019 (dollars in thousands): Property Debt Number of Company's Carrying Value As of December 31, 2020 Apartment Units Effective December 31, December 31, Maturity Interest Entity / Property Name or Rentable SF Ownership % (a) 2020 2019 Balance Date Rate Multi-family Metropolitan and Lofts at 40 Park (b) (c) 189 units 25.00 % $ 3,347 $ 7,257 $ 60,767 (d) (d) RiverTrace at Port Imperial 316 units 22.50 % 6,667 7,463 82,000 11/10/26 3.21 % Crystal House (e) 825 units 25.00 % - 28,823 - - - PI North - Riverwalk C (f) 360 units 40.00 % 36,992 35,527 75,569 12/06/21 L+ 2.75 % Riverpark at Harrison (g) 141 units 45.00 % 681 1,015 30,192 07/01/35 3.19 % Station House 378 units 50.00 % 34,026 35,676 95,137 07/01/33 4.82 % Urby at Harborside (h) 762 units 85.00 % 72,752 79,790 192,000 08/01/29 5.197 % PI North - Land (b) (i) 771 potential units 20.00 % 1,678 1,678 - - - Liberty Landing 850 potential units 50.00 % 337 337 - - - Hillsborough 206 (m) 160,000 sf 50.00 % - 1,962 - - - Office 12 Vreeland Road 139,750 sf 50.00 % 1,811 (j) 3,846 (j) 4,582 07/01/23 2.87 % Offices at Crystal Lake 106,345 sf 31.25 % 3,744 3,521 2,532 11/01/23 4.76 % Other Riverwalk Retail (k) 30,745 sf 20.00 % - 1,467 - - - Hyatt Regency Hotel Jersey City 351 rooms 50.00 % - - 100,000 10/01/26 3.668 % Other (l) 347 729 - - - Totals: $ 162,382 $ 209,091 $ 642,779 (a) Company's effective ownership % represents the Company's entitlement to residual distributions after payments of priority returns, where applicable. (b) The Company's ownership interests in this venture are subordinate to its partner's preferred capital balance and the Company is not expected to meaningfully participate in the venture's cash flows in the near term. (c) Through the joint venture, the Company also owns a 25 percent interest in a 50,973 square feet retail building ("Shops at 40 Park") and a 50 percent interest in a 59 -unit, five story multi-family rental property ("Lofts at 40 Park"). (d) Property debt balance consists of: (i) an interest only loan, collateralized by the Metropolitan at 40 Park, refinanced on September 18, 2020, with a balance of $ 36,500 , bears interest at LIBOR + 2.85 percent, matures in October 2023 ; (ii) an amortizable loan, collateralized by the Shops at 40 Park, with a balance of $ 6,067 , bears interest at LIBOR + 1.5 percent and matures in October 2021 ; (iii) an interest only loan, collateralized by the Lofts at 40 Park, with a balance of $ 18,200 , which bears interest at LIBOR + 1.5 percent and matures in January 2023 . (e) On December 31, 2020, the Crystal House Apartment Investors LLC, an unconsolidated joint venture property sold its sole apartment property and the Company recorded a gain of $ 35.1 million. See Note 3: Recent Transactions - Unconsolidated Joint Venture. (f) The venture has a construction loan with a maximum borrowing amount of $ 112,000 , of which the Company has guaranteed 10 percent of the principal outstanding. (g) On June 10, 2020, the loan was refinanced with a borrowing amount of $ 30,192 . (h) The Company owns an 85 percent interest with shared control over major decisions such as, approval of budgets, property financings and leasing guidelines. The Company has guaranteed $ 22 million of the principal outstanding debt. (i) The Company owns a 20 percent residual interest in undeveloped land parcels: parcels 6, I, and J that can accommodate the development of 771 apartment units. (j) At December 31, 2019, the Company evaluated the recoverability of the carrying value of certain investments in unconsolidated joint venture, being considered for sale in the short or medium term. The Company determined that due to tenant turnover, lease-up assumptions, along with the Company's plans to exit its investment, it was necessary to reduce the carrying value of the investment to its estimated fair value. Accordingly, the Company recorded an impairment charge of $ 2.6 million and $ 3.7 million at December 31, 2020 and 2019, respectively. (k) On March 12, 2020, the Company acquired its equity partner's 80 percent interest and increased ownership to 100 percent. See Note 3: Recent Transactions - Consolidation. (l) The Company owns other interests in various unconsolidated joint ventures, including interests in assets previously owned and interest in ventures whose businesses are related to its core operations. These ventures are not expected to significantly impact the Company's operations in the near term. (m) On December 17, 2020, the Company sold its interest in the joint venture for a sale price of $ 2.1 million and recorded a gain of $ 0.1 million. The following is a summary of the Company’s equity in earnings (loss) of unconsolidated joint ventures for the years ended December 31, 2020, 2019 and 2018 (dollars in thousands) : Year Ended December 31, Entity / Property Name 2020 2019 2018 Multi-family Marbella $ - $ - $ 205 Metropolitan at 40 Park ( 1,010 ) ( 422 ) ( 455 ) RiverTrace at Port Imperial 111 317 154 Crystal House ( 924 ) ( 687 ) ( 874 ) PI North - Riverwalk C / Land ( 368 ) ( 279 ) ( 126 ) Marbella II (b) - ( 15 ) 35 Riverpark at Harrison ( 273 ) ( 172 ) ( 232 ) Station House ( 1,650 ) ( 2,000 ) ( 2,096 ) Urby at Harborside 1,095 (c) 1,587 (c) ( 975 ) (c) Liberty Landing ( 5 ) - ( 5 ) Hillsborough 206 - - 16 Office Red Bank (d) - 8 ( 215 ) 12 Vreeland Road ( 2,035 ) ( 3,172 ) 285 Offices at Crystal Lake 224 79 73 Other Riverwalk Retail (e) ( 10 ) ( 72 ) ( 86 ) Hyatt Regency Hotel Jersey City 625 3,388 3,672 Other 388 121 497 Company's equity in earnings (loss) of unconsolidated joint ventures (a) $ ( 3,832 ) $ ( 1,319 ) $ ( 127 ) (a) Amounts are net of amortization of basis differences of $ 581 and $ 638 for the year ended December 31, 2020 and 2019, respectively. (b) On January 31, 2019, the Company acquired one of its equity partner's 50 percent interest and as a result, increased its ownership from 24.27 percent subordinated interest to 74.27 percent controlling interest, and ceased applying the equity method of accounting at such time. (c) Includes $ 2.6 million of the Company's share of the venture's income from its sale of an economic urban tax credit certificate from the State of New Jersey to a third party. The venture has an agreement to sell tax credits to a third party over the next seven years for $ 3 million per year for a total of $ 21 million. The sales are subject to the venture obtaining the tax credits from the State of New Jersey each year and transferring the tax credit certificate to the buyer each year. (d) On February 28, 2019, the Company sold its 50 percent interest to its partner and realized a gain of $ 0.9 million. (e) On March 12, 2020, the Company acquired its equity partner's 80 percent interest and increased ownership to 100 percent. See Note 3: Recent Transactions - Consolidation.

Deferred Charges, Goodwill And

Deferred Charges, Goodwill And Other Assets, Net	12 Months Ended
	Dec. 31, 2020
Deferred Charges, Goodwill And Other Assets [Line Items]
Deferred Charges, Goodwill And Other Assets, Net	5. DEFERRED CHARGES, GOODWILL AND OTHER ASSETS, NET December 31, December 31, (dollars in thousands) 2020 2019 Deferred leasing costs $ 112,421 $ 142,424 Deferred financing costs - unsecured revolving credit facility (a) 5,559 5,559 117,980 147,983 Accumulated amortization ( 52,428 ) ( 59,522 ) Deferred charges, net 65,552 88,461 Notes receivable (b) 1,167 1,625 In-place lease values, related intangibles and other assets, net (c) (d) 71,608 86,092 Goodwill (e) 2,945 2,945 Right of use assets (f) 22,298 22,604 Prepaid expenses and other assets, net (g) 35,971 73,375 Total deferred charges, goodwill and other assets, net (h) $ 199,541 $ 275,102 (a) Deferred financing costs related to all other debt liabilities (other than for the unsecured revolving credit facility) are netted against those debt liabilities for all periods presented. See Note 2: Significant Accounting Policies – Deferred Financing Costs. (b) Includes as of December 31, 2020 and 2019, respectively, an interest-free note receivable with a net present value of $ 1.2 million and $ 1.6 million, which matures in April 2023 . The Company believes this balance is fully collectible. (c) In accordance with ASC 805, Business Combinations, the Company recognizes rental revenue of acquired above and below market lease intangibles over the terms of the respective leases. The impact of amortizing the acquired above and below-market lease intangibles increased revenue by approximately $ 3.7 million, $ 4.3 million and $ 5.3 million for the years ended December 31, 2020, 2019 and 2018, respectively. The following table summarizes, as of December 31, 2020, the scheduled amortization of the Company’s acquired above and below-market lease intangibles for each of the five succeeding years (dollars in thousands) : Acquired Above- Acquired Below- Market Lease Market Lease Total Year Intangibles Intangibles Amortization 2021 $ ( 1,262 ) $ 4,620 $ 3,358 2022 ( 1,150 ) 4,368 3,218 2023 ( 1,020 ) 3,548 2,528 2024 ( 866 ) 3,080 2,214 2025 ( 391 ) 2,683 2,292 (d) The value of acquired in-place lease intangibles are amortized to expense over the remaining initial terms of the respective leases. The impact of the amortization of acquired in-place lease values is included in depreciation and amortization expense and amounted to approximately $ 9.1 million, $ 34.2 million and $ 17.9 million for the years ended December 31, 2020, 2019 and 2018, respectively. The following table summarizes, as of December 31, 2020, the scheduled amortization of the Company’s acquired in-place lease values for each of the five succeeding years (dollars in thousands) : Year 2021 $ 9,454 2022 8,386 2023 6,271 2024 4,635 2025 2,843 Total $ 31,589 (e) All goodwill is attributable to the Company’s Multi-family Real Estate and Services segment. (f) B alance recorded starting in 2019, pursuant to the Company’s adoption of ASU 2016-02 (Topic 842). This amount has a corresponding liability of $ 23.6 million, which is included in Accounts payable, accrued expense and other liabilities. See Note 12: Commitments and Contingencies – Ground Lease agreements for further details. (g) Includes as of December 31, 2020 and 2019, zero and $ 28.1 million, respectively, of funds available with the Company’s qualified intermediary from prior property sales proceeds. (h) The amount as of December 31, 2020 and 2019, includes $ 42.5 million and $ 68.6 million, respectively, for properties classified as discontinued operations. DERIVATIVE FINANCIAL INSTRUMENTS Cash Flow Hedges of Interest Rate Risk The Company’s objectives in using interest rate derivatives are to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish this objective, the Company primarily uses interest rate swaps as part of its interest rate risk management strategy. During the year ended December 31,2019, such derivatives were used to hedge the variable cash flows associated with existing variable-rate debt. As of December 31, 2020, the Company did not have any outstanding interest rate swaps that were designated as cash flow hedges of interest rate risk. During March 2019, in connection with a partial paydown of the Company’s outstanding term loans, the Company terminated interest rate swaps with an aggregate notional amount of $ 90 million. During June 2019, in connection with a subsequent partial paydown of the Company’s outstanding unsecured term loans, the Company terminated interest rate swaps with an aggregate notional amount of $ 160 million. During August 2019, in connection with a partial paydown of the Company’s outstanding unsecured term loans, the Company terminated rate swaps with an aggregate notional amount of $ 145 million. These paydowns resulted in the Company accelerating the reclassification of gains from other comprehensive income to earnings as a result of the hedged forecasted transactions no longer being probable to occur, amounting to $ 1.9 million for the year ended December 31, 2019. During December 2019, in connection with the paydown of the remainder of the outstanding term loans, the Company terminated the remaining interest rate swaps with an aggregate notional amount of $ 280 million for a receipt of $ 36,000 . Following these terminations, $ 25,000 was recorded in accumulated other comprehensive income and is being recorded as an adjustment to interest expense over the term of the original hedges and respective borrowings. Of the amount recorded in accumulated other comprehensive income following these terminations, $ 9,000 was recorded as a decrease to interest expense for the year ended December 31, 2019 and approximately $ 16,000 remained in accumulated other comprehensive income as of December 31, 2019. The changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in accumulated other comprehensive income and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. During the years ended December 31, 2020, 2019 and 2018 the Company recorded ineffectiveness loss of zero , zero and $ 0.2 million, respectively, which is included in interest and other investment income (loss) in the consolidated statements of operations, attributable to a floor mismatch in the underlying indices of the derivatives and the hedged interest payments made on its variable-rate debt. Amounts reported in accumulated other comprehensive income related to derivatives will be reclassified to interest expense as interest payments are made on the Company’s variable-rate debt. During the next 12 months, the Company estimates no additional amount to be reclassified to interest expense. The table below presents the effect of the Company’s derivative financial instruments on the Income Statement for the years ending December 31, 2020, 2019 and 2018 (dollars in thousands) : Derivatives in Cash Flow Hedging Relationships Amount of Gain or (Loss) Recognized in OCI on Derivative Location of Gain or (Loss) Reclassified from Accumulated OCI into Income Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income Location of Gain or (Loss) Recognized in Income on Derivative Amount of Gain or (Loss) Recognized in Income on Derivative and Reclassification for Forecasted Transactions No Longer Probable of Occurring) Total Amount of Interest Expense presented in the consolidated statements Year ended December 31, 2020 2019 2018 2020 2019 2018 2020 2019 2018 2020 2019 2018 Interest rate swaps $ - $ ( 4,682 ) $ 5,262 Interest expense $ 16 $ 3,551 $ 2,944 Interest and other investment income (loss) $ - $ 1,926 ( 204 ) $ ( 80,991 ) $ ( 90,569 ) $ ( 77,594 ) Credit-risk-related Contingent Features The Company had agreements with each of its derivative counterparties that contained a provision where the Company could be declared in default on its derivative obligations if repayment of the underlying indebtedness was accelerated by the lender due to the Company's default on the indebtedness. As of December 31, 2020, the Company did no t have any outstanding derivatives.
Mack-Cali Realty LP [Member]
Deferred Charges, Goodwill And Other Assets [Line Items]
Deferred Charges, Goodwill And Other Assets, Net	5. DEFERRED CHARGES, GOODWILL AND OTHER ASSETS, NET December 31, December 31, (dollars in thousands) 2020 2019 Deferred leasing costs $ 112,421 $ 142,424 Deferred financing costs - unsecured revolving credit facility (a) 5,559 5,559 117,980 147,983 Accumulated amortization ( 52,428 ) ( 59,522 ) Deferred charges, net 65,552 88,461 Notes receivable (b) 1,167 1,625 In-place lease values, related intangibles and other assets, net (c) (d) 71,608 86,092 Goodwill (e) 2,945 2,945 Right of use assets (f) 22,298 22,604 Prepaid expenses and other assets, net (g) 35,971 73,375 Total deferred charges, goodwill and other assets, net (h) $ 199,541 $ 275,102 (a) Deferred financing costs related to all other debt liabilities (other than for the unsecured revolving credit facility) are netted against those debt liabilities for all periods presented. See Note 2: Significant Accounting Policies – Deferred Financing Costs. (b) Includes as of December 31, 2020 and 2019, respectively, an interest-free note receivable with a net present value of $ 1.2 million and $ 1.6 million, which matures in April 2023 . The Company believes this balance is fully collectible. (c) In accordance with ASC 805, Business Combinations, the Company recognizes rental revenue of acquired above and below market lease intangibles over the terms of the respective leases. The impact of amortizing the acquired above and below-market lease intangibles increased revenue by approximately $ 3.7 million, $ 4.3 million and $ 5.3 million for the years ended December 31, 2020, 2019 and 2018, respectively. The following table summarizes, as of December 31, 2020, the scheduled amortization of the Company’s acquired above and below-market lease intangibles for each of the five succeeding years (dollars in thousands) : Acquired Above- Acquired Below- Market Lease Market Lease Total Year Intangibles Intangibles Amortization 2021 $ ( 1,262 ) $ 4,620 $ 3,358 2022 ( 1,150 ) 4,368 3,218 2023 ( 1,020 ) 3,548 2,528 2024 ( 866 ) 3,080 2,214 2025 ( 391 ) 2,683 2,292 (d) The value of acquired in-place lease intangibles are amortized to expense over the remaining initial terms of the respective leases. The impact of the amortization of acquired in-place lease values is included in depreciation and amortization expense and amounted to approximately $ 9.1 million, $ 34.2 million and $ 17.9 million for the years ended December 31, 2020, 2019 and 2018, respectively. The following table summarizes, as of December 31, 2020, the scheduled amortization of the Company’s acquired in-place lease values for each of the five succeeding years (dollars in thousands) : Year 2021 $ 9,454 2022 8,386 2023 6,271 2024 4,635 2025 2,843 Total $ 31,589 (e) All goodwill is attributable to the Company’s Multi-family Real Estate and Services segment. (f) B alance recorded starting in 2019, pursuant to the Company’s adoption of ASU 2016-02 (Topic 842). This amount has a corresponding liability of $ 23.6 million, which is included in Accounts payable, accrued expense and other liabilities. See Note 12: Commitments and Contingencies – Ground Lease agreements for further details. (g) Includes as of December 31, 2020 and 2019, zero and $ 28.1 million, respectively, of funds available with the Company’s qualified intermediary from prior property sales proceeds. (h) The amount as of December 31, 2020 and 2019, includes $ 42.5 million and $ 68.6 million, respectively, for properties classified as discontinued operations. DERIVATIVE FINANCIAL INSTRUMENTS Cash Flow Hedges of Interest Rate Risk The Company’s objectives in using interest rate derivatives are to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish this objective, the Company primarily uses interest rate swaps as part of its interest rate risk management strategy. During the year ended December 31,2019, such derivatives were used to hedge the variable cash flows associated with existing variable-rate debt. As of December 31, 2020, the Company did not have any outstanding interest rate swaps that were designated as cash flow hedges of interest rate risk. During March 2019, in connection with a partial paydown of the Company’s outstanding term loans, the Company terminated interest rate swaps with an aggregate notional amount of $ 90 million. During June 2019, in connection with a subsequent partial paydown of the Company’s outstanding unsecured term loans, the Company terminated interest rate swaps with an aggregate notional amount of $ 160 million. During August 2019, in connection with a partial paydown of the Company’s outstanding unsecured term loans, the Company terminated rate swaps with an aggregate notional amount of $ 145 million. These paydowns resulted in the Company accelerating the reclassification of gains from other comprehensive income to earnings as a result of the hedged forecasted transactions no longer being probable to occur, amounting to $ 1.9 million for the year ended December 31, 2019. During December 2019, in connection with the paydown of the remainder of the outstanding term loans, the Company terminated the remaining interest rate swaps with an aggregate notional amount of $ 280 million for a receipt of $ 36,000 . Following these terminations, $ 25,000 was recorded in accumulated other comprehensive income and is being recorded as an adjustment to interest expense over the term of the original hedges and respective borrowings. Of the amount recorded in accumulated other comprehensive income following these terminations, $ 9,000 was recorded as a decrease to interest expense for the year ended December 31, 2019 and approximately $ 16,000 remained in accumulated other comprehensive income as of December 31, 2019. The changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in accumulated other comprehensive income and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. During the years ended December 31, 2020, 2019 and 2018 the Company recorded ineffectiveness loss of zero , zero and $ 0.2 million, respectively, which is included in interest and other investment income (loss) in the consolidated statements of operations, attributable to a floor mismatch in the underlying indices of the derivatives and the hedged interest payments made on its variable-rate debt. Amounts reported in accumulated other comprehensive income related to derivatives will be reclassified to interest expense as interest payments are made on the Company’s variable-rate debt. During the next 12 months, the Company estimates no additional amount to be reclassified to interest expense. The table below presents the effect of the Company’s derivative financial instruments on the Income Statement for the years ending December 31, 2020, 2019 and 2018 (dollars in thousands) : Derivatives in Cash Flow Hedging Relationships Amount of Gain or (Loss) Recognized in OCI on Derivative Location of Gain or (Loss) Reclassified from Accumulated OCI into Income Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income Location of Gain or (Loss) Recognized in Income on Derivative Amount of Gain or (Loss) Recognized in Income on Derivative and Reclassification for Forecasted Transactions No Longer Probable of Occurring) Total Amount of Interest Expense presented in the consolidated statements Year ended December 31, 2020 2019 2018 2020 2019 2018 2020 2019 2018 2020 2019 2018 Interest rate swaps $ - $ ( 4,682 ) $ 5,262 Interest expense $ 16 $ 3,551 $ 2,944 Interest and other investment income (loss) $ - $ 1,926 ( 204 ) $ ( 80,991 ) $ ( 90,569 ) $ ( 77,594 ) Credit-risk-related Contingent Features The Company had agreements with each of its derivative counterparties that contained a provision where the Company could be declared in default on its derivative obligations if repayment of the underlying indebtedness was accelerated by the lender due to the Company's default on the indebtedness. As of December 31, 2020, the Company did no t have any outstanding derivatives.

Restricted Cash

Restricted Cash	12 Months Ended
	Dec. 31, 2020
Restricted Cash [Line Items]
Restricted Cash	6. RESTRICTED CASH Restricted cash generally includes tenant and resident security deposits for certain of the Company’s properties, and escrow and reserve funds for debt service, real estate taxes, property insurance, capital improvements, tenant improvements, and leasing costs established pursuant to certain mortgage financing arrangements, and is comprised of the following (dollars in thousands) : December 31, December 31, 2020 2019 Security deposits $ 5,289 $ 5,677 Escrow and other reserve funds 8,918 9,900 Total restricted cash $ 14,207 $ 15,577
Mack-Cali Realty LP [Member]
Restricted Cash [Line Items]
Restricted Cash	6. RESTRICTED CASH Restricted cash generally includes tenant and resident security deposits for certain of the Company’s properties, and escrow and reserve funds for debt service, real estate taxes, property insurance, capital improvements, tenant improvements, and leasing costs established pursuant to certain mortgage financing arrangements, and is comprised of the following (dollars in thousands) : December 31, December 31, 2020 2019 Security deposits $ 5,289 $ 5,677 Escrow and other reserve funds 8,918 9,900 Total restricted cash $ 14,207 $ 15,577

Discontinued Operations

Discontinued Operations	12 Months Ended
	Dec. 31, 2020
Discontinued Operations	7. DISCONTINUED OPERATIONS On December 19, 2019, the Company announced that its Board had determined to sell the Company’s entire Suburban Office Portfolio totaling approximately 6.6 million square feet. As the decision to sell the Suburban Office Portfolio represented a strategic shift in the Company’s operations, these properties’ results (other than a property classified as held for sale) are being classified as discontinued operations for all periods presented herein. As of December 31, 2020, the Company determined that a 350,000 square foot office property in the Suburban Office Portfolio, located in Holmdel, New Jersey no longer met the held for sale criteria. The property had originally been classified as held for sale as of December 31, 2019. The reclassified property has an aggregate book value of $ 19.8 million as of December 31, 2020, net of accumulated depreciation of $ 10.5 million (including catch-up depreciation). $ 2.8 million of previously recorded valuation allowance was reversed upon the reclassification of the asset from held for sale at December 31, 2020, and the corresponding property’s results and valuation allowance are also reclassified out of discontinued operations to continuing operations for all periods presented. In late 2019 through December 31, 2020, the Company completed the sale of 20 of these suburban office properties, totaling 3.2 million square feet, for net sales proceeds of $ 377.4 million. As of December 31, 2020, the Company has identified as held for sale 16 office properties (comprised of six disposal groups) in the Suburban Office Portfolio, totaling 3.0 million square feet (of which the Company currently has 15 properties totaling 2.8 million square feet under contract for sale for aggregate gross proceeds of $ 652.4 million). In January 2021, the Company completed the sale of one of the properties held for sale totaling 149,600 square feet for a gross sales price of $ 38 million. The Company plans to complete the sale of substantially all of its remaining Suburban Office Portfolio properties in 2021 and to use the available sales proceeds to pay down its corporate-level, unsecured indebtedness. However, the Company cannot predict whether or to what extent the timing of these sales and the expected amount may be impacted by the ongoing coronavirus (“COVID-19”). After the completion of the Suburban Office Portfolio sales, the Company’s holdings will consist of its waterfront class A office portfolio and its multi-family rental portfolio, and related development projects and land holdings. As a result of recent sales contract amendments and after considering the current market conditions as a result of the challenging economic climate with the current worldwide COVID-19 pandemic, the Company determined that the carrying value of six of the remaining held for sale properties (comprised of three disposal groups) was not expected to be recovered from estimated net sales proceeds, and accordingly recognized an unrealized held-for-sale loss allowance of $ 14 million during the year ended December 31, 2020. The following table summarizes income from discontinued operations and the related realized gains (losses) and unrealized losses on disposition of rental property and impairments, net, for the years ended December 31, 2020, 2019 and 2018 (dollars in thousands): Year Ended December 31, 2020 2019 2018 Total revenues $ 134,915 $ 169,672 $ 158,881 Operating and other expenses ( 54,129 ) ( 69,045 ) ( 66,528 ) Depreciation and amortization ( 4,806 ) ( 71,021 ) ( 61,029 ) Interest expense ( 5,256 ) ( 5,240 ) ( 5,990 ) Loss from early extinguishment of debt - - ( 1,757 ) Income from discontinued operations 70,724 24,366 23,577 Unrealized losses on disposition of rental property (a) ( 14,040 ) ( 141,266 ) - Realized gains (losses) on disposition of rental property (b) 25,241 7,916 - Realized gains (losses) and unrealized losses on disposition of rental property and impairments, net 11,201 ( 133,350 ) - Total discontinued operations, net $ 81,925 $ ( 108,984 ) $ 23,577 (a) Represents valuation allowances and impairment charges on properties classified as discontinued operations in 2020. (b) See Note 3: Real Estate Transactions – Dispositions for further information regarding properties sold and related gains (losses) .
Mack-Cali Realty LP [Member]
Discontinued Operations	7. DISCONTINUED OPERATIONS On December 19, 2019, the Company announced that its Board had determined to sell the Company’s entire Suburban Office Portfolio totaling approximately 6.6 million square feet. As the decision to sell the Suburban Office Portfolio represented a strategic shift in the Company’s operations, these properties’ results (other than a property classified as held for sale) are being classified as discontinued operations for all periods presented herein. As of December 31, 2020, the Company determined that a 350,000 square foot office property in the Suburban Office Portfolio, located in Holmdel, New Jersey no longer met the held for sale criteria. The property had originally been classified as held for sale as of December 31, 2019. The reclassified property has an aggregate book value of $ 19.8 million as of December 31, 2020, net of accumulated depreciation of $ 10.5 million (including catch-up depreciation). $ 2.8 million of previously recorded valuation allowance was reversed upon the reclassification of the asset from held for sale at December 31, 2020, and the corresponding property’s results and valuation allowance are also reclassified out of discontinued operations to continuing operations for all periods presented. In late 2019 through December 31, 2020, the Company completed the sale of 20 of these suburban office properties, totaling 3.2 million square feet, for net sales proceeds of $ 377.4 million. As of December 31, 2020, the Company has identified as held for sale 16 office properties (comprised of six disposal groups) in the Suburban Office Portfolio, totaling 3.0 million square feet (of which the Company currently has 15 properties totaling 2.8 million square feet under contract for sale for aggregate gross proceeds of $ 652.4 million). In January 2021, the Company completed the sale of one of the properties held for sale totaling 149,600 square feet for a gross sales price of $ 38 million. The Company plans to complete the sale of substantially all of its remaining Suburban Office Portfolio properties in 2021 and to use the available sales proceeds to pay down its corporate-level, unsecured indebtedness. However, the Company cannot predict whether or to what extent the timing of these sales and the expected amount may be impacted by the ongoing coronavirus (“COVID-19”). After the completion of the Suburban Office Portfolio sales, the Company’s holdings will consist of its waterfront class A office portfolio and its multi-family rental portfolio, and related development projects and land holdings. As a result of recent sales contract amendments and after considering the current market conditions as a result of the challenging economic climate with the current worldwide COVID-19 pandemic, the Company determined that the carrying value of six of the remaining held for sale properties (comprised of three disposal groups) was not expected to be recovered from estimated net sales proceeds, and accordingly recognized an unrealized held-for-sale loss allowance of $ 14 million during the year ended December 31, 2020. The following table summarizes income from discontinued operations and the related realized gains (losses) and unrealized losses on disposition of rental property and impairments, net, for the years ended December 31, 2020, 2019 and 2018 (dollars in thousands): Year Ended December 31, 2020 2019 2018 Total revenues $ 134,915 $ 169,672 $ 158,881 Operating and other expenses ( 54,129 ) ( 69,045 ) ( 66,528 ) Depreciation and amortization ( 4,806 ) ( 71,021 ) ( 61,029 ) Interest expense ( 5,256 ) ( 5,240 ) ( 5,990 ) Loss from early extinguishment of debt - - ( 1,757 ) Income from discontinued operations 70,724 24,366 23,577 Unrealized losses on disposition of rental property (a) ( 14,040 ) ( 141,266 ) - Realized gains (losses) on disposition of rental property (b) 25,241 7,916 - Realized gains (losses) and unrealized losses on disposition of rental property and impairments, net 11,201 ( 133,350 ) - Total discontinued operations, net $ 81,925 $ ( 108,984 ) $ 23,577 (a) Represents valuation allowances and impairment charges on properties classified as discontinued operations in 2020. (b) See Note 3: Real Estate Transactions – Dispositions for further information regarding properties sold and related gains (losses) .

Senior Unsecured Notes

Senior Unsecured Notes	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Line Items]
Senior Unsecured Notes	8. SENIOR UNSECURED NOTES A summary of the Company’s senior unsecured notes as of December 31, 2020 and 2019 is as follows (dollars in thousands) : December 31, December 31, Effective 2020 2019 Rate (1) 4.500 % Senior Unsecured Notes, due April 18, 2022 $ 300,000 $ 300,000 4.612 % 3.150 % Senior Unsecured Notes, due May 15, 2023 275,000 275,000 3.517 % Principal balance outstanding 575,000 575,000 Adjustment for unamortized debt discount ( 1,504 ) ( 2,170 ) Unamortized deferred financing costs ( 843 ) ( 1,346 ) Total senior unsecured notes, net $ 572,653 $ 571,484 (1) Includes the cost of terminated treasury lock agreements (if any), offering and other transaction costs and the discount/premium on the notes, as applicable. The terms of the Company’s senior unsecured notes include certain restrictions and covenants which require compliance with financial ratios relating to the maximum amount of debt leverage, the maximum amount of secured indebtedness, the minimum amount of debt service coverage and the maximum amount of unsecured debt as a percent of unsecured assets. The Company was in compliance with its debt covenants under the indenture relating to its senior unsecured notes as of December 31, 2020.
Mack-Cali Realty LP [Member]
Debt Disclosure [Line Items]
Senior Unsecured Notes	8. SENIOR UNSECURED NOTES A summary of the Company’s senior unsecured notes as of December 31, 2020 and 2019 is as follows (dollars in thousands) : December 31, December 31, Effective 2020 2019 Rate (1) 4.500 % Senior Unsecured Notes, due April 18, 2022 $ 300,000 $ 300,000 4.612 % 3.150 % Senior Unsecured Notes, due May 15, 2023 275,000 275,000 3.517 % Principal balance outstanding 575,000 575,000 Adjustment for unamortized debt discount ( 1,504 ) ( 2,170 ) Unamortized deferred financing costs ( 843 ) ( 1,346 ) Total senior unsecured notes, net $ 572,653 $ 571,484 (1) Includes the cost of terminated treasury lock agreements (if any), offering and other transaction costs and the discount/premium on the notes, as applicable. The terms of the Company’s senior unsecured notes include certain restrictions and covenants which require compliance with financial ratios relating to the maximum amount of debt leverage, the maximum amount of secured indebtedness, the minimum amount of debt service coverage and the maximum amount of unsecured debt as a percent of unsecured assets. The Company was in compliance with its debt covenants under the indenture relating to its senior unsecured notes as of December 31, 2020.

Unsecured Revolving Credit Faci

Unsecured Revolving Credit Facility And Term Loans	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Line Items]
Unsecured Revolving Credit Facility And Term Loans	9. UNSECURED REVOLVING CREDIT FACILITY AND TERM LOANS On January 25, 2017, the Company entered into an amended revolving credit facility and new term loan agreement (“2017 Credit Agreement”) with a group of 13 lenders. Pursuant to the 2017 Credit Agreement, the Company refinanced its existing $ 600 million unsecured revolving credit facility (“2017 Credit Facility”) and entered into a new $ 325 million unsecured, delayed-draw term loan facility (“2017 Term Loan”). Effective March 6, 2018, the Company elected to determine its interest rate under the 2017 Credit Agreement and under the 2017 Term Loan using the defined leverage ratio option, resulting in an interest rate of London Inter Bank Offered Rate (“LIBOR”) plus 130 basis points and LIBOR plus 155 basis points, respectively. The terms of the 2017 Credit Facility include: (1) a four year term ending in January 2021 , with two six month extension options, subject to the Company not being in default on the facility and with the payment of a fee of 7.5 basis points for each extension; (2) revolving credit loans may be made to the Company in an aggregate principal amount of up to $ 600 million (subject to increase as discussed below), with a sublimit under the 2017 Credit Facility for the issuance of letters of credit in an amount not to exceed $ 60 million (subject to increase as discussed below), of which $ 10.6 million of letters of credit had been issued as of December 31, 2020; (3) an interest rate, based on the Operating Partnership’s unsecured debt ratings from Moody’s or S&P, or, at the Operating Partnership’s option, if it no longer maintains a debt rating from Moody’s or S&P, or such debt ratings fall below Baa3 and BBB-, based on a defined leverage ratio; and (4) a facility fee, currently 25 basis points, payable quarterly based on the Operating Partnership’s unsecured debt ratings from Moody’s or S&P, or, at the Operating Partnership’s option, if it no longer maintains a debt rating from Moody’s or S&P or such debt ratings fall below Baa3 and BBB-, based on a defined leverage ratio. The Company’s unsecured debt is currently rated B1 by Moody’s and B+ by S&P. In January 2021, the Company elected to exercise the first option to extend the 2017 Credit Facility maturity date for a period of six months . Accordingly, the term of the 2017 Credit Facility was extended to July 2021 , with the Company’s payment of the 7.5 basis point extension fee. After electing to use the defined leverage ratio to determine the interest rate, the interest rates on outstanding borrowings, alternate base rate loans and the facility fee on the current borrowing capacity, payable quarterly in arrears, on the 2017 Credit Facility are currently based on the following total leverage ratio grid: Interest Rate - Applicable Interest Rate - Basis Points Applicable Above LIBOR for Basis Points Alternate Base Facility Fee Total Leverage Ratio Above LIBOR Rate Loans Basis Points < 45 % 125.0 25.0 20.0 ≥ 45 % and < 50 % 130.0 30.0 25.0 ≥ 50 % and < 55 % (current ratio) 135.0 35.0 30.0 ≥ 55 % 160.0 60.0 35.0 Prior to the election to use the defined leverage ratio option, the interest rates on outstanding borrowings, alternate base rate loans and the facility fee on the current borrowing capacity, payable quarterly in arrears, on the 2017 Credit Facility were based upon the Operating Partnership’s unsecured debt ratings, as follows: Interest Rate - Applicable Interest Rate - Basis Points Operating Partnership's Applicable Above LIBOR for Unsecured Debt Ratings: Basis Points Alternate Base Facility Fee Higher of S&P or Moody's Above LIBOR Rate Loans Basis Points No ratings or less than BBB-/Baa3 155.0 55.0 30.0 BBB- or Baa3 (interest rate based on Company's election through March 5, 2018) 120.0 20.0 25.0 BBB or Baa2 100.0 0.0 20.0 BBB+ or Baa1 90.0 0.0 15.0 A- or A3 or higher 87.5 0.0 12.5 The terms of the 2017 Term Loan included: (1) a three year term ending in January 2020 , with two one year extension options; (2) multiple draws of the term loan commitments may be made within 12 months of the effective date of the 2017 Credit Agreement up to an aggregate principal amount of $ 325 million (subject to increase as discussed below), with no requirement to be drawn in full; provided, that, if the Company does not borrow at least 50 percent of the initial term commitment from the term lenders (i.e. 50 percent of $ 325 million) on or before July 25, 2017, the amount of unused term loan commitments shall be reduced on such date so that, after giving effect to such reduction, the amount of unused term loan commitments is not greater than the outstanding term loans on such date; (3) a n interest rate, based on the Operating Partnership’s unsecured debt ratings from Moody’s or S&P, or, at the Operating Partnership’s option if it no longer maintains a debt rating from Moody’s or S&P or such debt ratings fall below Baa3 and BBB-, based on a defined leverage ratio; and (4) a term commitment fee on any unused term loan commitment during the first 12 months after the effective date of the 2017 Credit Agreement at a rate of 0.25 percent per annum on the sum of the average daily unused portion of the aggregate term loan commitments. On March 22, 2017, the Company drew the full $ 325 million available under the 2017 Term Loan. On March 29, 2017, the Company executed interest rate swap arrangements to fix LIBOR with an aggregate average rate of 1.6473 % for the swaps and a then aggregate fixed rate of 3.1973 % on borrowings under the 2017 Term Loan. During the year ended December 31, 2019, the Company prepaid the 2017 Term Loan (using a portion of the proceeds from a new mortgage loan collateralized by an office building located at 111 River Street and using borrowings under the Company’s unsecured revolving credit facility) and recorded a net loss of $ 173,000 from extinguishment of debt, as a result of a gain of $ 80,000 due to the early termination of part of the interest rate swap arrangements and the write off of unamortized deferred financing costs and fees of amounting to $ 253,000 as a result of the debt prepayment. After electing to use the defined leverage ratio to determine the interest rate, the interest rate under the 2017 Term Loan was based on the following total leverage ratio grid: Interest Rate - Applicable Interest Rate - Basis Points Applicable Above LIBOR for Basis Points Alternate Base Rate Total Leverage Ratio above LIBOR Loans < 45 % 145.0 45.0 ≥ 45 % and < 50 % 155.0 55.0 ≥ 50 % and < 55 % (current ratio) 165.0 65.0 ≥ 55 % 195.0 95.0 Prior to the election to use the defined leverage ratio option, the interest rate on the 2017 Term Loan was based upon the Operating Partnership's unsecured debt ratings, as follows: Interest Rate - Applicable Interest Rate - Basis Points Operating Partnership's Applicable Above LIBOR for Unsecured Debt Ratings: Basis Points Alternate Base Rate Higher of S&P or Moody's Above LIBOR Loans No ratings or less than BBB-/Baa3 185.0 85.0 BBB- or Baa3 (interest rate based on Company's election through March 5, 2018) 140.0 40.0 BBB or Baa2 115.0 15.0 BBB+ or Baa1 100.0 0.0 A- or A3 or higher 90.0 0.0 On up to four occasions at any time after the effective date of the 2017 Credit Agreement , the Company may elect to request (1) an increase to the existing revolving credit commitments (any such increase, the “New Revolving Credit Commitments”) and/or (2) the establishment of one or more new term loan commitments (the “New Term Commitments”, together with the 2017 Credit Commitments, the “Incremental Commitments”), by up to an aggregate amount not to exceed $ 350 million for all Incremental Commitments. The Company may also request that the sublimit for letters of credit available under the 2017 Credit Facility be increased to $ 100 million (without arranging any New Revolving Credit Commitments). No lender or letter of credit issued has any obligation to accept any Incremental Commitment or any increase to the letter of credit subfacility. There is no premium or penalty associated with full or partial prepayment of borrowings under the 2017 Credit Agreement. The 2017 Credit Agreement, which applies to both the 2017 Credit Facility and 2017 Term Loan, includes certain restrictions and covenants which limit, among other things the incurrence of additional indebtedness, the incurrence of liens and the disposition of real estate properties (to the extent that: (i) such property dispositions cause the Company to default on any of the financial ratios of the 2017 Credit Agreement (described below), or (ii) the property dispositions are completed while the Company is under an event of default under the 2017 Credit Agreement, unless, under certain circumstances, such disposition is being carried out to cure such default), and which require compliance with financial ratios relating to the maximum leverage ratio (60 percent), the maximum amount of secured indebtedness (40 percent), the minimum amount of fixed charge coverage (1.5 times), the maximum amount of unsecured indebtedness (60 percent), the minimum amount of unencumbered property interest coverage (2.0 times) and certain investment limitations (generally 15 percent of total capitalization). The 2017 Credit Agreement contains “change of control” provisions that permit the lenders to declare a default and require the immediate repayment of all outstanding borrowings under the 2017 Credit Facility. These change of control provisions, which have been included as an event of default under the agreements governing the Company’s revolving credit facilities since June 2000, are triggered if, among other things, a majority of the seats on the Board of Directors (other than vacant seats) become occupied by directors who were neither nominated by the Board Directors nor appointed by a majority of directors nominated by the Board of Directors. Furthermore, the agreements governing the Company's Senior Unsecured Notes include cross-acceleration provisions that would constitute an event of default requiring immediate repayment of the Notes if the change of control provisions under the 2017 Credit Facility are triggered and the lenders declare a default and exercise their rights under the 2017 Credit Facility and accelerate repayment of the outstanding borrowings thereunder. In addition, construction loans secured by two multi-family residential property development projects contain cross-acceleration provisions similar to those in the agreements governing the Notes for defaults by the Company. If these change of control provisions were triggered, the Company could seek a forbearance, waiver or amendment of the change of control provisions from the lenders, however there can be no assurance that the Company would be able to obtain such forbearance, waiver or amendment on acceptable terms or at all. If an event of default has occurred and is continuing, the entire outstanding balance under the 2017 Credit Agreement may (or, in the case of any bankruptcy event of default, shall) become immediately due and payable, and the Company will not make any excess distributions except to enable the General Partner to continue to qualify as a REIT under the IRS Code. Before it amended and restated its unsecured revolving credit facility in January 2017, the Company had a $ 600 million unsecured revolving credit facility with a group of 17 lenders that was scheduled to mature in July 2017 . The interest rate on outstanding borrowings (not electing the Company’s competitive bid feature) and the facility fee on the current borrowing capacity, payable quarterly in arrears, was based upon the Operating Partnership’s unsecured debt ratings at the time, as follows: Operating Partnership's Interest Rate - Unsecured Debt Ratings: Applicable Basis Points Facility Fee Higher of S&P or Moody's Above LIBOR Basis Points No ratings or less than BBB-/Baa3 170.0 35.0 BBB- or Baa3 (since January 2017 amendment) 130.0 30.0 BBB or Baa2 110.0 20.0 BBB+ or Baa1 100.0 15.0 A- or A3 or higher 92.5 12.5 In January 2016, the Company obtained a $ 350 million unsecured term loan (“2016 Term Loan”), which had been scheduled to mature in January 2019 with two one - year extension options. On January 7, 2019, the Company exercised the first one-year extension option with the payment of an extension fee of $ 0.5 million, which extended the maturity of the 2016 Term Loan to January 2020 . The interest rate for the term loan is based on the Operating Partnership’s unsecured debt ratings, or, at the Company's option, a defined leverage ratio. Effective March 6, 2018, the Company elected to determine its interest rate under the 2016 Term Loan using the defined leverage ratio option, resulting in an interest rate of LIBOR plus 155 basis points. The Company entered into interest rate swap arrangements to fix LIBOR for the duration of the term loan. Including costs, the current all-in fixed rate is 3.28 percent. The proceeds from the loan were used primarily to repay outstanding borrowings on the Company’s then existing unsecured revolving credit facility and to repay $ 200 million senior unsecured notes that matured on January 15, 2016 . During the year ended December 31, 2019, the Company prepaid the 2016 Term Loan (using a portion of the cash sales proceeds from the Flex portfolio sale, using the proceeds from a mortgage loan financing obtained on Soho Lofts Apartments and using a portion of the proceeds from a new mortgage loan collateralized by an office building located at 111 River Street) and recorded a gain of $ 2.1 million due to the early termination of part of the interest rate swap arrangements, as a result of the debt prepayment during the year ended December 31, 2019. Unamortized deferred financing costs and fees amounting to $ 242,000 pertaining to the 2016 Term Loan were written off during the year ended December 31, 2019. In summary, the Company recorded a net gain from extinguishment of debt of $ 1.6 million for the year ended December 31, 2019, as described above. After electing to use the defined leverage ratio to determine interest rate, the interest rate under the 2016 Term Loan was based on the following total leverage ratio grid: Interest Rate - Applicable Basis Total Leverage Ratio Points above LIBOR < 45 % 145.0 ≥ 45 % and < 50 % 155.0 ≥ 50 % and < 55 % (current ratio) 165.0 ≥ 55 % 195.0 Prior to the election to use the defined interest leverage ratio option, the interest rate on the 2016 Term Loan was based upon the Operating Partnership’s unsecured debt ratings, as follows: Operating Partnership's Interest Rate - Unsecured Debt Ratings: Applicable Basis Points Higher of S&P or Moody's Above LIBOR No ratings or less than BBB-/Baa3 185.0 BBB- or Baa3 (interest rate based on Company's election through March 5, 2018) 140.0 BBB or Baa2 115.0 BBB+ or Baa1 100.0 A- or A3 or higher 90.0 The terms of the 2016 Term Loan include certain restrictions and covenants which limit, among other things the incurrence of additional indebtedness, the incurrence of liens and the disposition of real estate properties (to the extent that: (i) such property dispositions cause the Company to default on any of the financial ratios of the term loan described below, or (ii) the property dispositions are completed while the Company is under an event of default under the term loan, unless, under certain circumstances, such disposition is being carried out to cure such default), and which require compliance with financial ratios relating to the maximum leverage ratio (60 percent), the maximum amount of secured indebtedness (40 percent), the minimum amount of fixed charge coverage (1.5 times), the maximum amount of unsecured indebtedness (60 percent), the minimum amount of unencumbered property interest coverage (2.0 times) and certain investment limitations (generally 15 percent of total capitalization). If an event of default has occurred and is continuing, the Company will not make any excess distributions except to enable the General Partner to continue to qualify as a REIT under the IRS Code. On August 30, 2018, the Company entered into an amendment to the 2017 Credit Agreement (the “2017 Credit Agreement Amendment”) and an amendment to the 2016 Term Loan (the “2016 Term Loan Amendment”). Each of the 2017 Credit Agreement Amendment and the 2016 Term Loan Amendment was effective as of June 30, 2018 and provided for the following material amendments to the terms of both the 2017 Credit Agreement and 2016 Term Loan: 1. The unsecured debt ratio covenant has been modified with respect to the measurement of the unencumbered collateral pool of assets in the calculation of such ratio for the period commencing July 1, 2018 and continuing until December 31, 2019 to allow the Operating Partnership to utilize the “as-is” appraised value of the properties known as ‘Harborside Plaza I’ and ‘Harborside Plaza V’ properties located in Jersey City, NJ in such calculation; and 2. A new covenant has been added that prohibits the Company from making any optional or voluntary payment, repayment, repurchase or redemption of any unsecured indebtedness of the Company (or any subsidiaries) that matures after January 25, 2022, at any time when any of the Total Leverage Ratio or the unsecured debt ratio covenants exceeds 60 percent (all as defined in the 2017 Credit Agreement and the 2016 Term Loan) or an appraisal is being used to determine the value of Harborside Plaza I and Harborside Plaza V for the unsecured debt ratio covenant. All other terms and conditions of the 2017 Credit Agreement and the 2016 Term Loan remained unchanged. The Company was in compliance with its debt covenants under its unsecured revolving credit facility as of December 31, 2020. As of December 31, 2020 and 2019, the Company’s borrowings under its unsecured credit facility totaled $ 25 million and $ 329 million, respectively.
Mack-Cali Realty LP [Member]
Debt Disclosure [Line Items]
Unsecured Revolving Credit Facility And Term Loans	9. UNSECURED REVOLVING CREDIT FACILITY AND TERM LOANS On January 25, 2017, the Company entered into an amended revolving credit facility and new term loan agreement (“2017 Credit Agreement”) with a group of 13 lenders. Pursuant to the 2017 Credit Agreement, the Company refinanced its existing $ 600 million unsecured revolving credit facility (“2017 Credit Facility”) and entered into a new $ 325 million unsecured, delayed-draw term loan facility (“2017 Term Loan”). Effective March 6, 2018, the Company elected to determine its interest rate under the 2017 Credit Agreement and under the 2017 Term Loan using the defined leverage ratio option, resulting in an interest rate of London Inter Bank Offered Rate (“LIBOR”) plus 130 basis points and LIBOR plus 155 basis points, respectively. The terms of the 2017 Credit Facility include: (1) a four year term ending in January 2021 , with two six month extension options, subject to the Company not being in default on the facility and with the payment of a fee of 7.5 basis points for each extension; (2) revolving credit loans may be made to the Company in an aggregate principal amount of up to $ 600 million (subject to increase as discussed below), with a sublimit under the 2017 Credit Facility for the issuance of letters of credit in an amount not to exceed $ 60 million (subject to increase as discussed below), of which $ 10.6 million of letters of credit had been issued as of December 31, 2020; (3) an interest rate, based on the Operating Partnership’s unsecured debt ratings from Moody’s or S&P, or, at the Operating Partnership’s option, if it no longer maintains a debt rating from Moody’s or S&P, or such debt ratings fall below Baa3 and BBB-, based on a defined leverage ratio; and (4) a facility fee, currently 25 basis points, payable quarterly based on the Operating Partnership’s unsecured debt ratings from Moody’s or S&P, or, at the Operating Partnership’s option, if it no longer maintains a debt rating from Moody’s or S&P or such debt ratings fall below Baa3 and BBB-, based on a defined leverage ratio. The Company’s unsecured debt is currently rated B1 by Moody’s and B+ by S&P. In January 2021, the Company elected to exercise the first option to extend the 2017 Credit Facility maturity date for a period of six months . Accordingly, the term of the 2017 Credit Facility was extended to July 2021 , with the Company’s payment of the 7.5 basis point extension fee. After electing to use the defined leverage ratio to determine the interest rate, the interest rates on outstanding borrowings, alternate base rate loans and the facility fee on the current borrowing capacity, payable quarterly in arrears, on the 2017 Credit Facility are currently based on the following total leverage ratio grid: Interest Rate - Applicable Interest Rate - Basis Points Applicable Above LIBOR for Basis Points Alternate Base Facility Fee Total Leverage Ratio Above LIBOR Rate Loans Basis Points < 45 % 125.0 25.0 20.0 ≥ 45 % and < 50 % 130.0 30.0 25.0 ≥ 50 % and < 55 % (current ratio) 135.0 35.0 30.0 ≥ 55 % 160.0 60.0 35.0 Prior to the election to use the defined leverage ratio option, the interest rates on outstanding borrowings, alternate base rate loans and the facility fee on the current borrowing capacity, payable quarterly in arrears, on the 2017 Credit Facility were based upon the Operating Partnership’s unsecured debt ratings, as follows: Interest Rate - Applicable Interest Rate - Basis Points Operating Partnership's Applicable Above LIBOR for Unsecured Debt Ratings: Basis Points Alternate Base Facility Fee Higher of S&P or Moody's Above LIBOR Rate Loans Basis Points No ratings or less than BBB-/Baa3 155.0 55.0 30.0 BBB- or Baa3 (interest rate based on Company's election through March 5, 2018) 120.0 20.0 25.0 BBB or Baa2 100.0 0.0 20.0 BBB+ or Baa1 90.0 0.0 15.0 A- or A3 or higher 87.5 0.0 12.5 The terms of the 2017 Term Loan included: (1) a three year term ending in January 2020 , with two one year extension options; (2) multiple draws of the term loan commitments may be made within 12 months of the effective date of the 2017 Credit Agreement up to an aggregate principal amount of $ 325 million (subject to increase as discussed below), with no requirement to be drawn in full; provided, that, if the Company does not borrow at least 50 percent of the initial term commitment from the term lenders (i.e. 50 percent of $ 325 million) on or before July 25, 2017, the amount of unused term loan commitments shall be reduced on such date so that, after giving effect to such reduction, the amount of unused term loan commitments is not greater than the outstanding term loans on such date; (3) a n interest rate, based on the Operating Partnership’s unsecured debt ratings from Moody’s or S&P, or, at the Operating Partnership’s option if it no longer maintains a debt rating from Moody’s or S&P or such debt ratings fall below Baa3 and BBB-, based on a defined leverage ratio; and (4) a term commitment fee on any unused term loan commitment during the first 12 months after the effective date of the 2017 Credit Agreement at a rate of 0.25 percent per annum on the sum of the average daily unused portion of the aggregate term loan commitments. On March 22, 2017, the Company drew the full $ 325 million available under the 2017 Term Loan. On March 29, 2017, the Company executed interest rate swap arrangements to fix LIBOR with an aggregate average rate of 1.6473 % for the swaps and a then aggregate fixed rate of 3.1973 % on borrowings under the 2017 Term Loan. During the year ended December 31, 2019, the Company prepaid the 2017 Term Loan (using a portion of the proceeds from a new mortgage loan collateralized by an office building located at 111 River Street and using borrowings under the Company’s unsecured revolving credit facility) and recorded a net loss of $ 173,000 from extinguishment of debt, as a result of a gain of $ 80,000 due to the early termination of part of the interest rate swap arrangements and the write off of unamortized deferred financing costs and fees of amounting to $ 253,000 as a result of the debt prepayment. After electing to use the defined leverage ratio to determine the interest rate, the interest rate under the 2017 Term Loan was based on the following total leverage ratio grid: Interest Rate - Applicable Interest Rate - Basis Points Applicable Above LIBOR for Basis Points Alternate Base Rate Total Leverage Ratio above LIBOR Loans < 45 % 145.0 45.0 ≥ 45 % and < 50 % 155.0 55.0 ≥ 50 % and < 55 % (current ratio) 165.0 65.0 ≥ 55 % 195.0 95.0 Prior to the election to use the defined leverage ratio option, the interest rate on the 2017 Term Loan was based upon the Operating Partnership's unsecured debt ratings, as follows: Interest Rate - Applicable Interest Rate - Basis Points Operating Partnership's Applicable Above LIBOR for Unsecured Debt Ratings: Basis Points Alternate Base Rate Higher of S&P or Moody's Above LIBOR Loans No ratings or less than BBB-/Baa3 185.0 85.0 BBB- or Baa3 (interest rate based on Company's election through March 5, 2018) 140.0 40.0 BBB or Baa2 115.0 15.0 BBB+ or Baa1 100.0 0.0 A- or A3 or higher 90.0 0.0 On up to four occasions at any time after the effective date of the 2017 Credit Agreement , the Company may elect to request (1) an increase to the existing revolving credit commitments (any such increase, the “New Revolving Credit Commitments”) and/or (2) the establishment of one or more new term loan commitments (the “New Term Commitments”, together with the 2017 Credit Commitments, the “Incremental Commitments”), by up to an aggregate amount not to exceed $ 350 million for all Incremental Commitments. The Company may also request that the sublimit for letters of credit available under the 2017 Credit Facility be increased to $ 100 million (without arranging any New Revolving Credit Commitments). No lender or letter of credit issued has any obligation to accept any Incremental Commitment or any increase to the letter of credit subfacility. There is no premium or penalty associated with full or partial prepayment of borrowings under the 2017 Credit Agreement. The 2017 Credit Agreement, which applies to both the 2017 Credit Facility and 2017 Term Loan, includes certain restrictions and covenants which limit, among other things the incurrence of additional indebtedness, the incurrence of liens and the disposition of real estate properties (to the extent that: (i) such property dispositions cause the Company to default on any of the financial ratios of the 2017 Credit Agreement (described below), or (ii) the property dispositions are completed while the Company is under an event of default under the 2017 Credit Agreement, unless, under certain circumstances, such disposition is being carried out to cure such default), and which require compliance with financial ratios relating to the maximum leverage ratio (60 percent), the maximum amount of secured indebtedness (40 percent), the minimum amount of fixed charge coverage (1.5 times), the maximum amount of unsecured indebtedness (60 percent), the minimum amount of unencumbered property interest coverage (2.0 times) and certain investment limitations (generally 15 percent of total capitalization). The 2017 Credit Agreement contains “change of control” provisions that permit the lenders to declare a default and require the immediate repayment of all outstanding borrowings under the 2017 Credit Facility. These change of control provisions, which have been included as an event of default under the agreements governing the Company’s revolving credit facilities since June 2000, are triggered if, among other things, a majority of the seats on the Board of Directors (other than vacant seats) become occupied by directors who were neither nominated by the Board Directors nor appointed by a majority of directors nominated by the Board of Directors. Furthermore, the agreements governing the Company's Senior Unsecured Notes include cross-acceleration provisions that would constitute an event of default requiring immediate repayment of the Notes if the change of control provisions under the 2017 Credit Facility are triggered and the lenders declare a default and exercise their rights under the 2017 Credit Facility and accelerate repayment of the outstanding borrowings thereunder. In addition, construction loans secured by two multi-family residential property development projects contain cross-acceleration provisions similar to those in the agreements governing the Notes for defaults by the Company. If these change of control provisions were triggered, the Company could seek a forbearance, waiver or amendment of the change of control provisions from the lenders, however there can be no assurance that the Company would be able to obtain such forbearance, waiver or amendment on acceptable terms or at all. If an event of default has occurred and is continuing, the entire outstanding balance under the 2017 Credit Agreement may (or, in the case of any bankruptcy event of default, shall) become immediately due and payable, and the Company will not make any excess distributions except to enable the General Partner to continue to qualify as a REIT under the IRS Code. Before it amended and restated its unsecured revolving credit facility in January 2017, the Company had a $ 600 million unsecured revolving credit facility with a group of 17 lenders that was scheduled to mature in July 2017 . The interest rate on outstanding borrowings (not electing the Company’s competitive bid feature) and the facility fee on the current borrowing capacity, payable quarterly in arrears, was based upon the Operating Partnership’s unsecured debt ratings at the time, as follows: Operating Partnership's Interest Rate - Unsecured Debt Ratings: Applicable Basis Points Facility Fee Higher of S&P or Moody's Above LIBOR Basis Points No ratings or less than BBB-/Baa3 170.0 35.0 BBB- or Baa3 (since January 2017 amendment) 130.0 30.0 BBB or Baa2 110.0 20.0 BBB+ or Baa1 100.0 15.0 A- or A3 or higher 92.5 12.5 In January 2016, the Company obtained a $ 350 million unsecured term loan (“2016 Term Loan”), which had been scheduled to mature in January 2019 with two one - year extension options. On January 7, 2019, the Company exercised the first one-year extension option with the payment of an extension fee of $ 0.5 million, which extended the maturity of the 2016 Term Loan to January 2020 . The interest rate for the term loan is based on the Operating Partnership’s unsecured debt ratings, or, at the Company's option, a defined leverage ratio. Effective March 6, 2018, the Company elected to determine its interest rate under the 2016 Term Loan using the defined leverage ratio option, resulting in an interest rate of LIBOR plus 155 basis points. The Company entered into interest rate swap arrangements to fix LIBOR for the duration of the term loan. Including costs, the current all-in fixed rate is 3.28 percent. The proceeds from the loan were used primarily to repay outstanding borrowings on the Company’s then existing unsecured revolving credit facility and to repay $ 200 million senior unsecured notes that matured on January 15, 2016 . During the year ended December 31, 2019, the Company prepaid the 2016 Term Loan (using a portion of the cash sales proceeds from the Flex portfolio sale, using the proceeds from a mortgage loan financing obtained on Soho Lofts Apartments and using a portion of the proceeds from a new mortgage loan collateralized by an office building located at 111 River Street) and recorded a gain of $ 2.1 million due to the early termination of part of the interest rate swap arrangements, as a result of the debt prepayment during the year ended December 31, 2019. Unamortized deferred financing costs and fees amounting to $ 242,000 pertaining to the 2016 Term Loan were written off during the year ended December 31, 2019. In summary, the Company recorded a net gain from extinguishment of debt of $ 1.6 million for the year ended December 31, 2019, as described above. After electing to use the defined leverage ratio to determine interest rate, the interest rate under the 2016 Term Loan was based on the following total leverage ratio grid: Interest Rate - Applicable Basis Total Leverage Ratio Points above LIBOR < 45 % 145.0 ≥ 45 % and < 50 % 155.0 ≥ 50 % and < 55 % (current ratio) 165.0 ≥ 55 % 195.0 Prior to the election to use the defined interest leverage ratio option, the interest rate on the 2016 Term Loan was based upon the Operating Partnership’s unsecured debt ratings, as follows: Operating Partnership's Interest Rate - Unsecured Debt Ratings: Applicable Basis Points Higher of S&P or Moody's Above LIBOR No ratings or less than BBB-/Baa3 185.0 BBB- or Baa3 (interest rate based on Company's election through March 5, 2018) 140.0 BBB or Baa2 115.0 BBB+ or Baa1 100.0 A- or A3 or higher 90.0 The terms of the 2016 Term Loan include certain restrictions and covenants which limit, among other things the incurrence of additional indebtedness, the incurrence of liens and the disposition of real estate properties (to the extent that: (i) such property dispositions cause the Company to default on any of the financial ratios of the term loan described below, or (ii) the property dispositions are completed while the Company is under an event of default under the term loan, unless, under certain circumstances, such disposition is being carried out to cure such default), and which require compliance with financial ratios relating to the maximum leverage ratio (60 percent), the maximum amount of secured indebtedness (40 percent), the minimum amount of fixed charge coverage (1.5 times), the maximum amount of unsecured indebtedness (60 percent), the minimum amount of unencumbered property interest coverage (2.0 times) and certain investment limitations (generally 15 percent of total capitalization). If an event of default has occurred and is continuing, the Company will not make any excess distributions except to enable the General Partner to continue to qualify as a REIT under the IRS Code. On August 30, 2018, the Company entered into an amendment to the 2017 Credit Agreement (the “2017 Credit Agreement Amendment”) and an amendment to the 2016 Term Loan (the “2016 Term Loan Amendment”). Each of the 2017 Credit Agreement Amendment and the 2016 Term Loan Amendment was effective as of June 30, 2018 and provided for the following material amendments to the terms of both the 2017 Credit Agreement and 2016 Term Loan: 1. The unsecured debt ratio covenant has been modified with respect to the measurement of the unencumbered collateral pool of assets in the calculation of such ratio for the period commencing July 1, 2018 and continuing until December 31, 2019 to allow the Operating Partnership to utilize the “as-is” appraised value of the properties known as ‘Harborside Plaza I’ and ‘Harborside Plaza V’ properties located in Jersey City, NJ in such calculation; and 2. A new covenant has been added that prohibits the Company from making any optional or voluntary payment, repayment, repurchase or redemption of any unsecured indebtedness of the Company (or any subsidiaries) that matures after January 25, 2022, at any time when any of the Total Leverage Ratio or the unsecured debt ratio covenants exceeds 60 percent (all as defined in the 2017 Credit Agreement and the 2016 Term Loan) or an appraisal is being used to determine the value of Harborside Plaza I and Harborside Plaza V for the unsecured debt ratio covenant. All other terms and conditions of the 2017 Credit Agreement and the 2016 Term Loan remained unchanged. The Company was in compliance with its debt covenants under its unsecured revolving credit facility as of December 31, 2020. As of December 31, 2020 and 2019, the Company’s borrowings under its unsecured credit facility totaled $ 25 million and $ 329 million, respectively.

Mortgages, Loans Payable And Ot

Mortgages, Loans Payable And Other Obligations	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Line Items]
Mortgages, Loans Payable And Other Obligations	10. MORTGAGES, LOANS PAYABLE AND OTHER OBLIGATIONS The Company has mortgages, loans payable and other obligations which primarily consist of various loans collateralized by certain of the Company’s rental properties, land and development projects. As of December 31, 2020, 19 of the Company’s properties, with a total carrying value of approximately $ 2.9 billion and three of the Company’s land and development projects, with a total carrying value of approximately $ 585 million, are encumbered by the Company’s mortgages and loans payable. Payments on mortgages, loans payable and other obligations are generally due in monthly installments of principal and interest, or interest only. The Company was in compliance with its debt covenants under its mortgages and loans payable as of December 31, 2020. A summary of the Company’s mortgages, loans payable and other obligations as of December 31, 2020 and 2019 is as follows (dollars in thousands) : Effective December 31, December 31, Property/Project Name Lender Rate (a) 2020 2019 Maturity Riverwatch Commons New York Community Bank N/A $ - $ 30,000 N/A Port Imperial South 4/5 Retail American General Life & A/G PC 4.56 % 3,866 3,934 12/01/21 Port Imperial 4/5 Hotel (b) Fifth Third Bank LIBOR+3.40 % 94,000 74,000 04/09/22 Port Imperial South 9 (c) Bank of New York Mellon LIBOR+2.13 % 46,357 11,615 12/19/22 Portside 7 CBRE Capital Markets/FreddieMac 3.57 % 58,998 58,998 08/01/23 Short Hills Residential (d) People's United Bank LIBOR+2.15 % 42,459 9,431 03/26/23 250 Johnson Nationwide Life Insurance Company 3.74 % 43,000 43,000 08/01/24 Liberty Towers (e) American General Life Insurance Company 3.37 % 265,000 232,000 10/01/24 The Charlotte (f) QuadReal Finance LIBOR+2.70 % 161,544 5,144 12/01/24 Portside 5/6 (g) New York Life Insurance Company 4.56 % 97,000 97,000 03/10/26 Marbella (BLVD 425) New York Life Insurance Company 4.17 % 131,000 131,000 08/10/26 Marbella II (BLVD 401) New York Life Insurance Company 4.29 % 117,000 117,000 08/10/26 101 Hudson Wells Fargo CMBS 3.20 % 250,000 250,000 10/11/26 Worcester MUFG Union Bank LIBOR+1.84 % 63,000 63,000 12/10/26 Short Hills Portfolio (h) Wells Fargo CMBS 4.15 % 124,500 124,500 04/01/27 150 Main St. Natixis Real Estate Capital LLC 4.48 % 41,000 41,000 08/05/27 Monaco (BLVD 495 N/S) (l) The Northwestern Mutual Life Insurance Co. 2.91 % 165,000 166,752 11/10/27 Port Imperial South 11 The Northwestern Mutual Life Insurance Co. 4.52 % 100,000 100,000 01/10/29 Soho Lofts (i) New York Community Bank 3.77 % 160,000 160,000 07/01/29 111 River St. Athene Annuity and Life Company 3.90 % 150,000 150,000 09/01/29 Port Imperial South 4/5 Garage (j) American General Life & A/G PC 4.85 % 33,138 32,600 12/01/29 Emery at Overlook Ridge (k) New York Community Bank 3.21 % 72,000 24,064 01/01/31 Principal balance outstanding 2,218,862 1,925,038 Unamortized deferred financing costs ( 14,718 ) ( 17,004 ) Total mortgages, loans payable and other obligations, net $ 2,204,144 $ 1,908,034 (a) Reflects effective rate of debt, including deferred financing costs, comprised of the cost of terminated treasury lock agreements (if any), debt initiation costs, mark-to-market adjustment of acquired debt and other transaction costs, as applicable. (b) The loan required an initial debt service coverage test for quarter ended September 30, 2020. Subsequent to September 30, 2020, the Company executed an agreement moving the initial debt service coverage test to March 31, 2021. The Company has guaranteed $ 19.5 million of the outstanding principal, subject to certain conditions. (c) This construction loan has a maximum borrowing capacity of $ 92 million and provides, subject to certain conditions, and a one year extension option with a fee of 15 basis points, of which the Company has guaranteed 10 percent of the outstanding principal, subject to certain conditions. (d) This construction loan has a maximum borrowing capacity of $ 64 million and provides, subject to certain conditions, and an 18 month extension option with a fee of 30 basis points, of which the Company has guaranteed 15 percent of the outstanding principal, subject to certain conditions. (e) In January 2020, the Company increased the size of the loan on Liberty Towers to $ 265 million, generating $ 33 million of additional proceeds. (f) This construction loan has a LIBOR floor of 2.0 percent, has a maximum borrowing capacity of $ 300 million and provides, subject to certain conditions, one one year extension option with a fee of 25 basis points. (g) The Company has guaranteed 10 percent of the outstanding principal, subject to certain conditions. (h) Properties, which are collateral for this mortgage loan, are classified as held for sale as of December 31, 2020. This mortgage loan does not permit early pre-payment. As a result of a signed contract to dispose of the properties, which are collateral for this loan, the Company may need to pay for significant costs to defease this loan, which will be expensed when incurred at the time of such defeasance. (i) Effective rate reflects the first five years of interest payments at a fixed rate. Interest payments after that period ends are based on LIBOR plus 2.75 % annually. (j) The loan was modified to defer interest and principal payments for a six month period ending December 1, 2020 . As of December 31, 2020, deferred interest of $ 0.8 million has been added to the principal balance. (k) In December 2020, the Company obtained a new $ 72 million mortgage loan collateralized by the Emery that matures on January 1, 2031 and received net loan proceeds of $ 10.4 million after repaying its construction loan. (l) In November 2020, the Company modified this mortgage loan, extending the maturity date from February 2021 to November 2027 . SCHEDULED PRINCIPAL PAYMENTS Scheduled principal payments for the Company’s senior unsecured notes (see Note 8), unsecured revolving credit facility and term loan (see Note 9) and mortgages, loans payable and other obligations (See Note 10) as of December 31, 2020 are as follows (dollars in thousands) : Scheduled Principal Period Amortization Maturities Total 2021 $ 590 $ 28,800 $ 29,390 2022 550 440,357 440,907 2023 2,047 376,457 378,504 2024 3,403 469,545 472,948 2025 3,300 - 3,300 2026 12,822 658,000 670,822 Thereafter - 822,991 822,991 Sub-total 22,712 2,796,150 2,818,862 Adjustment for unamortized debt discount/premium, net December 31, 2020 ( 1,504 ) - ( 1,504 ) Unamortized deferred financing costs ( 15,561 ) - ( 15,561 ) Totals $ 5,647 $ 2,796,150 $ 2,801,797 CASH PAID FOR INTEREST AND INTEREST CAPITALIZED Cash paid for interest for the years ended December 31, 2020, 2019 and 2018 was $ 103,543,000 $ 108,277,000 and $ 97,744,000 , (of which $ 5,139,000 , $ 5,125,000 and $ 6,280,000 pertained to properties classified as discontinued operations), respectively. Interest capitalized by the Company for the years ended December 31, 2020, 2019 and 2018 was $ 26,443,000 , $ 19,325,000 , and $ 27,047,000 , respectively (which amounts included $ 1,367,000 , $ 1,339,000 and $ 816,000 for the years ended December 31, 2020, 2019 and 2018, respectively, of interest capitalized on the Company’s investments in unconsolidated joint ventures which were substantially in development). SUMMARY OF INDEBTEDNESS As of December 31, 2020, the Company’s total indebtedness of $ 2,801,797,000 (weighted average interest rate of 3.76 percent) was comprised of $ 427,419,000 of unsecured revolving credit facility borrowings and other variable rate mortgage debt (weighted average rate of 3.38 percent) and fixed rate debt and other obligations of $ 2,374,378,000 (weighted average rate of 3.83 percent). As of December 31, 2019, the Company’s total indebtedness of $ 2,808,518,000 (weighted average interest rate of 3.81 percent) was comprised of $ 509,656,000 of unsecured revolving credit facility borrowings and other variable rate mortgage debt (weighted average rate of 3.54 percent) and fixed rate debt and other obligations of $ 2,298,862,000 (weighted average rate of 3.87 percent).
Mack-Cali Realty LP [Member]
Debt Disclosure [Line Items]
Mortgages, Loans Payable And Other Obligations	10. MORTGAGES, LOANS PAYABLE AND OTHER OBLIGATIONS The Company has mortgages, loans payable and other obligations which primarily consist of various loans collateralized by certain of the Company’s rental properties, land and development projects. As of December 31, 2020, 19 of the Company’s properties, with a total carrying value of approximately $ 2.9 billion and three of the Company’s land and development projects, with a total carrying value of approximately $ 585 million, are encumbered by the Company’s mortgages and loans payable. Payments on mortgages, loans payable and other obligations are generally due in monthly installments of principal and interest, or interest only. The Company was in compliance with its debt covenants under its mortgages and loans payable as of December 31, 2020. A summary of the Company’s mortgages, loans payable and other obligations as of December 31, 2020 and 2019 is as follows (dollars in thousands) : Effective December 31, December 31, Property/Project Name Lender Rate (a) 2020 2019 Maturity Riverwatch Commons New York Community Bank N/A $ - $ 30,000 N/A Port Imperial South 4/5 Retail American General Life & A/G PC 4.56 % 3,866 3,934 12/01/21 Port Imperial 4/5 Hotel (b) Fifth Third Bank LIBOR+3.40 % 94,000 74,000 04/09/22 Port Imperial South 9 (c) Bank of New York Mellon LIBOR+2.13 % 46,357 11,615 12/19/22 Portside 7 CBRE Capital Markets/FreddieMac 3.57 % 58,998 58,998 08/01/23 Short Hills Residential (d) People's United Bank LIBOR+2.15 % 42,459 9,431 03/26/23 250 Johnson Nationwide Life Insurance Company 3.74 % 43,000 43,000 08/01/24 Liberty Towers (e) American General Life Insurance Company 3.37 % 265,000 232,000 10/01/24 The Charlotte (f) QuadReal Finance LIBOR+2.70 % 161,544 5,144 12/01/24 Portside 5/6 (g) New York Life Insurance Company 4.56 % 97,000 97,000 03/10/26 Marbella (BLVD 425) New York Life Insurance Company 4.17 % 131,000 131,000 08/10/26 Marbella II (BLVD 401) New York Life Insurance Company 4.29 % 117,000 117,000 08/10/26 101 Hudson Wells Fargo CMBS 3.20 % 250,000 250,000 10/11/26 Worcester MUFG Union Bank LIBOR+1.84 % 63,000 63,000 12/10/26 Short Hills Portfolio (h) Wells Fargo CMBS 4.15 % 124,500 124,500 04/01/27 150 Main St. Natixis Real Estate Capital LLC 4.48 % 41,000 41,000 08/05/27 Monaco (BLVD 495 N/S) (l) The Northwestern Mutual Life Insurance Co. 2.91 % 165,000 166,752 11/10/27 Port Imperial South 11 The Northwestern Mutual Life Insurance Co. 4.52 % 100,000 100,000 01/10/29 Soho Lofts (i) New York Community Bank 3.77 % 160,000 160,000 07/01/29 111 River St. Athene Annuity and Life Company 3.90 % 150,000 150,000 09/01/29 Port Imperial South 4/5 Garage (j) American General Life & A/G PC 4.85 % 33,138 32,600 12/01/29 Emery at Overlook Ridge (k) New York Community Bank 3.21 % 72,000 24,064 01/01/31 Principal balance outstanding 2,218,862 1,925,038 Unamortized deferred financing costs ( 14,718 ) ( 17,004 ) Total mortgages, loans payable and other obligations, net $ 2,204,144 $ 1,908,034 (a) Reflects effective rate of debt, including deferred financing costs, comprised of the cost of terminated treasury lock agreements (if any), debt initiation costs, mark-to-market adjustment of acquired debt and other transaction costs, as applicable. (b) The loan required an initial debt service coverage test for quarter ended September 30, 2020. Subsequent to September 30, 2020, the Company executed an agreement moving the initial debt service coverage test to March 31, 2021. The Company has guaranteed $ 19.5 million of the outstanding principal, subject to certain conditions. (c) This construction loan has a maximum borrowing capacity of $ 92 million and provides, subject to certain conditions, and a one year extension option with a fee of 15 basis points, of which the Company has guaranteed 10 percent of the outstanding principal, subject to certain conditions. (d) This construction loan has a maximum borrowing capacity of $ 64 million and provides, subject to certain conditions, and an 18 month extension option with a fee of 30 basis points, of which the Company has guaranteed 15 percent of the outstanding principal, subject to certain conditions. (e) In January 2020, the Company increased the size of the loan on Liberty Towers to $ 265 million, generating $ 33 million of additional proceeds. (f) This construction loan has a LIBOR floor of 2.0 percent, has a maximum borrowing capacity of $ 300 million and provides, subject to certain conditions, one one year extension option with a fee of 25 basis points. (g) The Company has guaranteed 10 percent of the outstanding principal, subject to certain conditions. (h) Properties, which are collateral for this mortgage loan, are classified as held for sale as of December 31, 2020. This mortgage loan does not permit early pre-payment. As a result of a signed contract to dispose of the properties, which are collateral for this loan, the Company may need to pay for significant costs to defease this loan, which will be expensed when incurred at the time of such defeasance. (i) Effective rate reflects the first five years of interest payments at a fixed rate. Interest payments after that period ends are based on LIBOR plus 2.75 % annually. (j) The loan was modified to defer interest and principal payments for a six month period ending December 1, 2020 . As of December 31, 2020, deferred interest of $ 0.8 million has been added to the principal balance. (k) In December 2020, the Company obtained a new $ 72 million mortgage loan collateralized by the Emery that matures on January 1, 2031 and received net loan proceeds of $ 10.4 million after repaying its construction loan. (l) In November 2020, the Company modified this mortgage loan, extending the maturity date from February 2021 to November 2027 . SCHEDULED PRINCIPAL PAYMENTS Scheduled principal payments for the Company’s senior unsecured notes (see Note 8), unsecured revolving credit facility and term loan (see Note 9) and mortgages, loans payable and other obligations (See Note 10) as of December 31, 2020 are as follows (dollars in thousands) : Scheduled Principal Period Amortization Maturities Total 2021 $ 590 $ 28,800 $ 29,390 2022 550 440,357 440,907 2023 2,047 376,457 378,504 2024 3,403 469,545 472,948 2025 3,300 - 3,300 2026 12,822 658,000 670,822 Thereafter - 822,991 822,991 Sub-total 22,712 2,796,150 2,818,862 Adjustment for unamortized debt discount/premium, net December 31, 2020 ( 1,504 ) - ( 1,504 ) Unamortized deferred financing costs ( 15,561 ) - ( 15,561 ) Totals $ 5,647 $ 2,796,150 $ 2,801,797 CASH PAID FOR INTEREST AND INTEREST CAPITALIZED Cash paid for interest for the years ended December 31, 2020, 2019 and 2018 was $ 103,543,000 $ 108,277,000 and $ 97,744,000 , (of which $ 5,139,000 , $ 5,125,000 and $ 6,280,000 pertained to properties classified as discontinued operations), respectively. Interest capitalized by the Company for the years ended December 31, 2020, 2019 and 2018 was $ 26,443,000 , $ 19,325,000 , and $ 27,047,000 , respectively (which amounts included $ 1,367,000 , $ 1,339,000 and $ 816,000 for the years ended December 31, 2020, 2019 and 2018, respectively, of interest capitalized on the Company’s investments in unconsolidated joint ventures which were substantially in development). SUMMARY OF INDEBTEDNESS As of December 31, 2020, the Company’s total indebtedness of $ 2,801,797,000 (weighted average interest rate of 3.76 percent) was comprised of $ 427,419,000 of unsecured revolving credit facility borrowings and other variable rate mortgage debt (weighted average rate of 3.38 percent) and fixed rate debt and other obligations of $ 2,374,378,000 (weighted average rate of 3.83 percent). As of December 31, 2019, the Company’s total indebtedness of $ 2,808,518,000 (weighted average interest rate of 3.81 percent) was comprised of $ 509,656,000 of unsecured revolving credit facility borrowings and other variable rate mortgage debt (weighted average rate of 3.54 percent) and fixed rate debt and other obligations of $ 2,298,862,000 (weighted average rate of 3.87 percent).

Employee Benefit 401(k) Plans

Employee Benefit 401(k) Plans	12 Months Ended
	Dec. 31, 2020
Compensation And Retirement Disclosure [Line Items]
Employee Benefit 401(k) Plans	11. EMPLOYEE BENEFIT 401(k) PLANS Employees of the General Partner, who meet certain minimum age and service requirements, are eligible to participate in the Mack-Cali Realty Corporation 401(k) Savings/Retirement Plan (the “401(k) Plan”). Eligible employees may elect to defer from one percent up to 60 percent of their annual compensation on a pre-tax basis to the 401(k) Plan, subject to certain limitations imposed by federal law. The amounts contributed by employees are immediately vested and non-forfeitable. The Company may make discretionary matching or profit sharing contributions to the 401(k) Plan on behalf of eligible participants in any plan year. Participants are always 100 percent vested in their pre-tax contributions and will begin vesting in any matching or profit sharing contributions made on their behalf after two years of service with the Company at a rate of 20 percent per year, becoming 100 percent vested after a total of six year s of service with the Company. All contributions are allocated as a percentage of compensation of the eligible participants for the Plan year. The assets of the 401(k) Plan are held in trust and a separate account is established for each participant. A participant may receive a distribution of his or her vested account balance in the 401(k) Plan in a single sum or in installment payments upon his or her termination of service with the Company. Total expense recognized by the Company for the 401(k) Plan for the years ended December 31, 2020, 2019 and 2018 was $ 771,000 , $ 773,000 and $ 886,000 , respectively.
Mack-Cali Realty LP [Member]
Compensation And Retirement Disclosure [Line Items]
Employee Benefit 401(k) Plans	11. EMPLOYEE BENEFIT 401(k) PLANS Employees of the General Partner, who meet certain minimum age and service requirements, are eligible to participate in the Mack-Cali Realty Corporation 401(k) Savings/Retirement Plan (the “401(k) Plan”). Eligible employees may elect to defer from one percent up to 60 percent of their annual compensation on a pre-tax basis to the 401(k) Plan, subject to certain limitations imposed by federal law. The amounts contributed by employees are immediately vested and non-forfeitable. The Company may make discretionary matching or profit sharing contributions to the 401(k) Plan on behalf of eligible participants in any plan year. Participants are always 100 percent vested in their pre-tax contributions and will begin vesting in any matching or profit sharing contributions made on their behalf after two years of service with the Company at a rate of 20 percent per year, becoming 100 percent vested after a total of six year s of service with the Company. All contributions are allocated as a percentage of compensation of the eligible participants for the Plan year. The assets of the 401(k) Plan are held in trust and a separate account is established for each participant. A participant may receive a distribution of his or her vested account balance in the 401(k) Plan in a single sum or in installment payments upon his or her termination of service with the Company. Total expense recognized by the Company for the 401(k) Plan for the years ended December 31, 2020, 2019 and 2018 was $ 771,000 , $ 773,000 and $ 886,000 , respectively.

Disclosure Of Fair Value Of Ass

Disclosure Of Fair Value Of Assets And Liabilities	12 Months Ended
	Dec. 31, 2020
Fair Value Disclosures [Line Items]
Disclosure Of Fair Value Of Assets And Liabilities	12. DISCLOSURE OF FAIR VALUE OF ASSETS AND LIABILITIES The following disclosure of estimated fair value was determined by management using available market information and appropriate valuation methodologies. However, considerable judgment is necessary to interpret market data and develop estimated fair value. Accordingly, the estimates presented herein are not necessarily indicative of the amounts the Company could realize on disposition of the assets and liabilities at December 31, 2020 and 2019. The use of different market assumptions and/or estimation methodologies may have a material effect on the estimated fair value amounts. Cash equivalents, receivables, notes receivables, accounts payable, and accrued expenses and other liabilities are carried at amounts which reasonably approximate their fair values as of December 31, 2020 and 2019. The fair value of the Company’s long-term debt, consisting of senior unsecured notes, unsecured term loans, an unsecured revolving credit facility and mortgages, loans payable and other obligations aggregated approximately $ 2,879,002,000 and $ 2,791,629,000 as compared to the book value of approximately $ 2,801,797,000 and $ 2,808,518,000 as of December 31, 2020 and 2019, respectively. The fair value of the Company’s long-term debt was categorized as a level 3 basis (as provided by ASC 820, Fair Value Measurements and Disclosures). The fair value was estimated using a discounted cash flow analysis valuation based on the borrowing rates currently available to the Company for loans with similar terms and maturities. The fair value of the mortgage debt and the unsecured notes was determined by discounting the future contractual interest and principal payments by a market rate. Although the Company has determined that the majority of the inputs used to value its derivative financial instruments fall within level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivative financial instruments utilize level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. The Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivative financial instruments. As a result, the Company has determined that its derivative financial instruments valuations in their entirety are classified in level 2 of the fair value hierarchy. The fair value measurements used in the evaluation of the Company’s rental properties for impairment analysis are considered to be Level 3 valuations within the fair value hierarchy, as there are significant unobservable assumptions. Assumptions that were utilized in the fair value calculations include, but are not limited to, estimated holding periods, discount rates, market capitalization rates, expected lease rental rates, room rental and food and beverage revenue rates, third-party broker information and information from potential buyers, as applicable. Valuations of real estate identified as held for sale are based on estimated sale prices, net of estimated selling costs, of such property. In the absence of an executed sales agreement with a set sales price, management’s estimate of the net sales price may be based on a number of unobservable assumptions, including but not limited to the Company’s estimates of future cash flows, market capitalization rates and discount rates, if applicable. For developable land, an estimated per-unit market value assumption is also considered based on development rights for the land. As of December 31, 2020, assumptions that were utilized in the fair value calculation included: Primary Valuation Unobservable Location Range of Description Techniques Assumptions Type Rates Office properties held for sale on which the Company recognized impairment losses or unrealized allowance reversals Discounted cash flows or sale prices per purchase and sale agreements Discount rates Suburban 7.5 % - 10 % Exit Capitalization rates Suburban 7.5 % - 9 % Market rental rates per square foot Suburban $ 27.50 - $ 37.00 Land holdings held for sale and held and used on which the Company recognized impairment losses Developable units and market rate per unit or sale prices per purchase and sale agreements Market rates per residential unit Suburban $ 32,000 - $ 40,000 Market rates per square foot Suburban $ 12.00 Hotel properties on which the Company recognized impairment losses or unrealized allowance reversals Discounted cash flows Discount rate Waterfront 10 % Exit Capitalization rate Waterfront 7.5 % The Company identified 16 office properties (comprised of six disposal groups), a retail pad leased to others, several developable land parcels as held for sale as of December 31, 2020 with an aggregate carrying value of $ 657 million. As a result of recent sales contract amendments and after considering the current market conditions as a result of the challenging economic climate with the current worldwide COVID-19 pandemic, the Company determined that the carrying value of six of the remaining held for sale properties (comprised of three disposal groups) and several land parcels was not expected to be recovered from estimated net sales proceeds and accordingly, during the year ended December 31, 2020, recognized an unrealized held-for-sale loss allowance of $ 15.7 million for the properties and recorded land and other impairments of $ 9.5 million. The Company determined that, due to the shortening of its expected period of ownership and a s a result of the adverse effect the COVID-19 pandemic has had, and continues to have, on its hotel operations, the Company evaluated the recoverability of the carrying values of its two adjacent hotel properties and determined that it was necessary to reduce the carrying values of its two hotel assets located in Weehawken, New Jersey to their estimated fair values. One of these hotels has closed its rooms since March 2020. Accordingly, the Company recorded an impairment charge of $ 36.6 million on these hotels at September 30, 2020 which is included in property impairments on the consolidated statement of operations for the year ended December 31, 2020. The Company also evaluated the recoverability of the carrying values of its land parcels and determined that it was necessary to reduce the carrying values of three held-and-used land parcels to their estimated fair values and recorded land and other impairment charges of $ 7.3 million for the year ended December 31, 2020. The Company identified 35 office properties, a retail pad leased to others and several developable land parcels as held for sale as of December 31, 2019 with an aggregate carrying value of $ 966 million. The Company determined that the carrying value of 20 of the properties and several land parcels was not expected to be recovered from estimated net sales proceeds and accordingly during the year ended December 31, 2019 recognized an unrealized loss allowance of $ 164.4 million. Disclosure about fair value of assets and liabilities is based on pertinent information available to management as of December 31, 2020 and 2019. Although management is not aware of any factors that would significantly affect the fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since December 31, 2020 and current estimates of fair value may differ significantly from the amounts presented herein. The recent outbreak of COVID-19 worldwide has significantly slowed global economic activity and caused significant volatility in financial markets. As such, there is currently significant uncertainty around the breadth and duration of business disruptions related to COVID-19, as well as its impact on the U.S. economy. The current economic environment can and will be significantly adversely affected by many factors beyond the Company’s control. The extent to which COVID-19 impacts the Company’s fair value estimates in the future will depend on developments going forward, many of which are highly uncertain and cannot be predicted. In consideration of the magnitude of such uncertainties under the current climate, management has considered all available information at its properties and in the marketplace to provide its estimates as of December 31, 2020.
Mack-Cali Realty LP [Member]
Fair Value Disclosures [Line Items]
Disclosure Of Fair Value Of Assets And Liabilities	12. DISCLOSURE OF FAIR VALUE OF ASSETS AND LIABILITIES The following disclosure of estimated fair value was determined by management using available market information and appropriate valuation methodologies. However, considerable judgment is necessary to interpret market data and develop estimated fair value. Accordingly, the estimates presented herein are not necessarily indicative of the amounts the Company could realize on disposition of the assets and liabilities at December 31, 2020 and 2019. The use of different market assumptions and/or estimation methodologies may have a material effect on the estimated fair value amounts. Cash equivalents, receivables, notes receivables, accounts payable, and accrued expenses and other liabilities are carried at amounts which reasonably approximate their fair values as of December 31, 2020 and 2019. The fair value of the Company’s long-term debt, consisting of senior unsecured notes, unsecured term loans, an unsecured revolving credit facility and mortgages, loans payable and other obligations aggregated approximately $ 2,879,002,000 and $ 2,791,629,000 as compared to the book value of approximately $ 2,801,797,000 and $ 2,808,518,000 as of December 31, 2020 and 2019, respectively. The fair value of the Company’s long-term debt was categorized as a level 3 basis (as provided by ASC 820, Fair Value Measurements and Disclosures). The fair value was estimated using a discounted cash flow analysis valuation based on the borrowing rates currently available to the Company for loans with similar terms and maturities. The fair value of the mortgage debt and the unsecured notes was determined by discounting the future contractual interest and principal payments by a market rate. Although the Company has determined that the majority of the inputs used to value its derivative financial instruments fall within level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivative financial instruments utilize level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. The Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivative financial instruments. As a result, the Company has determined that its derivative financial instruments valuations in their entirety are classified in level 2 of the fair value hierarchy. The fair value measurements used in the evaluation of the Company’s rental properties for impairment analysis are considered to be Level 3 valuations within the fair value hierarchy, as there are significant unobservable assumptions. Assumptions that were utilized in the fair value calculations include, but are not limited to, estimated holding periods, discount rates, market capitalization rates, expected lease rental rates, room rental and food and beverage revenue rates, third-party broker information and information from potential buyers, as applicable. Valuations of real estate identified as held for sale are based on estimated sale prices, net of estimated selling costs, of such property. In the absence of an executed sales agreement with a set sales price, management’s estimate of the net sales price may be based on a number of unobservable assumptions, including but not limited to the Company’s estimates of future cash flows, market capitalization rates and discount rates, if applicable. For developable land, an estimated per-unit market value assumption is also considered based on development rights for the land. As of December 31, 2020, assumptions that were utilized in the fair value calculation included: Primary Valuation Unobservable Location Range of Description Techniques Assumptions Type Rates Office properties held for sale on which the Company recognized impairment losses or unrealized allowance reversals Discounted cash flows or sale prices per purchase and sale agreements Discount rates Suburban 7.5 % - 10 % Exit Capitalization rates Suburban 7.5 % - 9 % Market rental rates per square foot Suburban $ 27.50 - $ 37.00 Land holdings held for sale and held and used on which the Company recognized impairment losses Developable units and market rate per unit or sale prices per purchase and sale agreements Market rates per residential unit Suburban $ 32,000 - $ 40,000 Market rates per square foot Suburban $ 12.00 Hotel properties on which the Company recognized impairment losses or unrealized allowance reversals Discounted cash flows Discount rate Waterfront 10 % Exit Capitalization rate Waterfront 7.5 % The Company identified 16 office properties (comprised of six disposal groups), a retail pad leased to others, several developable land parcels as held for sale as of December 31, 2020 with an aggregate carrying value of $ 657 million. As a result of recent sales contract amendments and after considering the current market conditions as a result of the challenging economic climate with the current worldwide COVID-19 pandemic, the Company determined that the carrying value of six of the remaining held for sale properties (comprised of three disposal groups) and several land parcels was not expected to be recovered from estimated net sales proceeds and accordingly, during the year ended December 31, 2020, recognized an unrealized held-for-sale loss allowance of $ 15.7 million for the properties and recorded land and other impairments of $ 9.5 million. The Company determined that, due to the shortening of its expected period of ownership and a s a result of the adverse effect the COVID-19 pandemic has had, and continues to have, on its hotel operations, the Company evaluated the recoverability of the carrying values of its two adjacent hotel properties and determined that it was necessary to reduce the carrying values of its two hotel assets located in Weehawken, New Jersey to their estimated fair values. One of these hotels has closed its rooms since March 2020. Accordingly, the Company recorded an impairment charge of $ 36.6 million on these hotels at September 30, 2020 which is included in property impairments on the consolidated statement of operations for the year ended December 31, 2020. The Company also evaluated the recoverability of the carrying values of its land parcels and determined that it was necessary to reduce the carrying values of three held-and-used land parcels to their estimated fair values and recorded land and other impairment charges of $ 7.3 million for the year ended December 31, 2020. The Company identified 35 office properties, a retail pad leased to others and several developable land parcels as held for sale as of December 31, 2019 with an aggregate carrying value of $ 966 million. The Company determined that the carrying value of 20 of the properties and several land parcels was not expected to be recovered from estimated net sales proceeds and accordingly during the year ended December 31, 2019 recognized an unrealized loss allowance of $ 164.4 million. Disclosure about fair value of assets and liabilities is based on pertinent information available to management as of December 31, 2020 and 2019. Although management is not aware of any factors that would significantly affect the fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since December 31, 2020 and current estimates of fair value may differ significantly from the amounts presented herein. The recent outbreak of COVID-19 worldwide has significantly slowed global economic activity and caused significant volatility in financial markets. As such, there is currently significant uncertainty around the breadth and duration of business disruptions related to COVID-19, as well as its impact on the U.S. economy. The current economic environment can and will be significantly adversely affected by many factors beyond the Company’s control. The extent to which COVID-19 impacts the Company’s fair value estimates in the future will depend on developments going forward, many of which are highly uncertain and cannot be predicted. In consideration of the magnitude of such uncertainties under the current climate, management has considered all available information at its properties and in the marketplace to provide its estimates as of December 31, 2020.

Commitments And Contingencies

Commitments And Contingencies	12 Months Ended
	Dec. 31, 2020
Commitments And Contingencies [Line Items]
Commitments And Contingencies	13. COMMITMENTS AND CONTINGENCIES TAX ABATEMENT AGREEMENTS Pursuant to agreements with certain municipalities, the Company is required to make payments in lieu of property taxes (“PILOT”) on certain of its properties and has tax abatement agreements on other properties, as follows: The Harborside Plaza 4-A agreement with the City of Jersey City, as amended, which commenced in 2002, is for a term of 20 years. The annual PILOT is equal to two percent of Total Project Costs, as defined. Total Project Costs are $ 49.5 million. The PILOT totaled $ 1.1 million, $ 1.1 million and $ 1.1 million for the years ended December 31, 2020, 2019 and 2018, respectively. The Harborside Plaza 5 agreement, also with the City of Jersey City, as amended, which commenced in 2002, is for a term of 20 years. The annual PILOT is equal to two percent of Total Project Costs, as defined. Total Project Costs are $ 170.9 million. The PILOT totaled $ 4.4 million, $ 4.4 million and $ 4.4 million for the years ended December 31, 2020, 2019 and 2018, respectively. The Port Imperial South 1/3 Garage development project agreement with the City of Weehawken has a term of five years beginning when the project is substantially complete, which occurred in the fourth quarter of 2015. The agreement provides that real estate taxes be paid at 100 percent on the land value of the project only over the five year period and allows for a phase in of real estate taxes on the building improvement value at zero percent in year one and 95 percent in years two through five. The Port Imperial Hotel development project agreement with the City of Weehawken is for a term of 15 years following substantial completion, which occurred in December 2018. The annual PILOT is equal to two percent of Total Project Costs, as defined therein. The PILOT totaled $ 2.2 million and $ 2.2 million for the year ended December 31, 2020 and 2019, respectively. The Port Imperial South 11 development project agreement with the City of Weehawken is for a term of 15 years following substantial completion, which occurred in August 2018. The annual PILOT is equal to 10 percent of Gross Revenues, as defined therein. The PILOT totaled $ 1.1 million and $ 1.0 million for the year ended December 31, 2020 and 2019, respectively. The 111 River Realty agreement with the City of Hoboken, which commenced on October 1, 2001 expires in April 2022. The annual PILOT payment is a fixed amount until expiration. The PILOT totaled $ 1.4 million, $ 1.4 million and $ 1.4 million for the years ended December 31, 2020, 2019 and 2018, respectively. The Monaco Towers agreement with the City of Jersey City, which commenced in 2011, is for a term of 10 years. The annual PILOT is equal to 10 percent of gross revenues, as defined. The PILOT totaled $ 1.8 million, $ 2.1 million and $ 2.4 million for the years ended December 31, 2020, 2019 and 2018, respectively. The Marbella II agreement with the City of Jersey City, which commenced in 2016, is for a term of 10 years. The annual PILOT is equal to 10 percent of gross revenues for years 1-4, 12 percent of gross revenues for years 5-8 and 14 percent of gross revenue for years 9-10, as defined therein. The PILOT totaled $1.2 million and $ 1.4 million for the year ended December 31, 2020 and 2019, respectively. The Port Imperial Parcel South 9 development project agreement with the City of Weehawken is for a term of 25 years following substantial completion, which is anticipated to occur in the first quarter 2021. The annual PILOT is equal to 11 percent of gross revenue for years 1-10, 12.5 percent for years 11-18 and 14 percent for years 19-25, as defined therein. The Port Imperial South Park Parcel development project agreement with the Township of Weehawken is for a term of 25 years following substantial completion. The project is anticipated to begin construction in late 2021 with Substantial Completion in 2024. The annual PILOT is equal to 10 percent of Gross Revenues, as defined therein. At the conclusion of the above-referenced agreements, it is expected that the properties will be assessed by the municipality and be subject to real estate taxes at the then prevailing rates. LITIGATION The Company is a defendant in litigation arising in the normal course of its business activities. Management does not believe that the ultimate resolution of these matters will have a materially adverse effect upon the Company’s financial condition taken as whole. GROUND LEASE AGREEMENTS Future minimum rental payments under the terms of all non-cancelable ground leases under which the Company is the lessee, as of December 31, 2020, are as follows (dollars in thousands): As of December 31, 2020 Year Amount 2021 $ 1,750 2022 1,750 2023 1,756 2024 1,776 2025 1,742 2026 through 2101 152,980 Total lease payments 161,754 Less: imputed interest ( 138,152 ) Total $ 23,602 As of December 31, 2019 Year Amount 2020 $ 1,750 2021 1,750 2022 1,750 2023 1,756 2024 1,776 2025 through 2098 154,722 Total lease payments 163,504 Less: imputed interest ( 139,748 ) Total $ 23,756 Ground lease expense incurred by the Company during the years ended December 31, 2020, 2019 and 2018 amounted to $ 1.6 million, $ 2.6 million and $ 2.3 million, respectively. In conjunction with the adoption of ASU 2016-02 (Topic 842), starting on January 1, 2019, the Company capitalized operating leases, which had a balance of $ 22.3 million at December 31, 2020 for three ground leases. Such amount represents the net present value (“NPV”) of future payments detailed above. The incremental borrowing rates used to arrive at the NPV ranged from 7.576 percent to 7.618 percent for the remaining ground lease terms ranging from 80.83 years to 82.58 years. These rates were arrived at by adjusting the fixed rates of the Company’s mortgage debt with debt having terms approximating the remaining lease term of the Company’s ground leases and calculating notional rates for fully-collateralized loans. CONSTRUCTION PROJECTS The Company is developing a 313 -unit multi-family project known as Port Imperial South 9 at Port Imperial in Weehawken, New Jersey, which began construction in third quarter 2018. The construction project, which is estimated to cost $ 143.8 million, of which construction costs of $ 98.1 million have been incurred through December 31, 2020, is expected to be ready for occupancy early 2021 . The Company has funded $ 51.8 million as of December 31, 2020, and the remaining construction costs are expected to be funded from a $ 92 million construction loan (of which $ 46.3 million was drawn as of December 31, 2020). The Company is developing a 198 -unit multi-family project known as the Upton at Short Hills located in Short Hills, New Jersey, which began construction in fourth quarter 2018. The construction project, which is estimated to cost $ 99.4 million, of which $ 77.9 million has been incurred through December 31, 2020, is expected to be ready for occupancy in first quarter 2021 . The Company has funded $ 35.4 million of the construction costs, and the remaining construction costs are expected to be funded from a $ 64 million construction loan (of which $ 42.5 million was drawn as of December 31, 2020). The Company is developing a 750 -unit multi-family project at 25 Christopher Columbus in Jersey City, New Jersey, which began construction in first quarter 2019. The construction project, which is estimated to cost $ 469.5 million, of which $ 331 million has been incurred through December 31, 2020, is expected to be ready for occupancy in first quarter 2022 . The Company has funded $ 169.5 million of the construction costs, and the remaining construction costs are expected to be funded from a $ 300 million construction loan (of which $ 161.5 million was drawn as of December 31, 2020). MANAGEMENT CHANGES On July 24, 2020, the Company terminated Michael J. DeMarco as its Chief Executive Officer without cause, pursuant to his employment agreement and the associated equity award agreements he has with the Company. On August 8, 2020, the Company entered into a Consulting and Cooperating Agreement with Mr. DeMarco (the “Consulting Agreement”). Pursuant to the Consulting Agreement, in exchange for Mr. DeMarco’s providing certain consulting, cooperation, and transition services to the Company through December 31, 2020, Mr. DeMarco was considered to have remained employed with the Company through the term of the Consulting Agreement solely for purposes of calculating the prorated vesting of outstanding time-based long-term incentive partnership units to which Mr. DeMarco was entitled upon his termination of employment with the Company. Mr. DeMarco is eligible to receive the severance payments and benefits upon such a termination without cause (outside of a change in control) described under the heading “Employment Contracts; Potential Payments Upon Termination or Change in Control—Michael J. DeMarco Employment Agreement,” “—Michael J. DeMarco Class AO LTIP Award Agreement,” and “—Long-Term Incentive Plan Award Agreements,” each as set forth in the Company’s definitive revised proxy statement filed with the Securities and Exchange Commission on June 16, 2020, which description is incorporated by reference herein, and taking into account Mr. DeMarco’s target bonus percentage of 175 % of base salary established for the year 2020. Effective as of July 25, 2020, the Board of Directors appointed MaryAnne Gilmartin, the Chair of the Company’s Board of Directors, as interim Chief Executive Officer of the Company. Ms. Gilmartin will continue to serve as Chair of the Board, but has resigned as a member of the Nominating & Corporate Governance Committee of the Board. Concurrently, Tammy K. Jones, a current director, was appointed to serve as the lead independent director on the Board. In connection with Ms. Gilmartin’s appointment, the Company has entered into a letter agreement (the “Letter Agreement”) with MAG Partners 2.0 LLC (“MAG Partners”), an entity wholly owned by Ms. Gilmartin. Pursuant to the Letter Agreement, MAG Partners has agreed to make Ms. Gilmartin’s services available to the Company to serve as its interim Chief Executive Officer. The term of this arrangement and Ms. Gilmartin’s appointment as interim Chief Executive Officer (the “Term”) will continue until the earliest to occur of (i) the commencement of employment of a permanent Chief Executive Officer of the Company, (ii) a period of six months has elapsed, or an earlier or later date selected by the Board, and (iii) Ms. Gilmartin’s death or disability, or the termination of the arrangement by MAG Partners (including a resignation by Ms. Gilmartin of her appointment as interim Chief Executive Officer). On January 22, 2021, the Company entered into a six -month extension (the “Extension Letter”) of the Letter Agreement with MAG Partners, pursuant to which MAG Partners has made Ms. Gilmartin’s services available to the Company to serve as its interim Chief Executive Officer. Pursuant to the Extension Letter, the term of the Letter Agreement has been extended until July 25, 2021 (the “Extended Term”). However, Ms. Gilmartin’s appointment as interim Chief Executive Officer will end upon the earlier to occur of (x) the commencement of employment of a permanent Chief Executive Officer of the Company or (y) a date selected by the Board of Directors of the Company, and during any remaining portion of the Extended Term, MAG Partners will continue to make Ms. Gilmartin reasonably available to assist with the transition of Ms. Gilmartin’s duties to her successor and with any other matters that the Company may reasonably request. In addition, if the Extended Term ends at any time prior to July 25, 2021 (other than a termination by the Company for cause), then the Company will continue to pay MAG Partners its monthly $ 150,000 cash retainer fee through July 25, 2021. Pursuant to the Letter Agreement, during the Term the Company will pay to MAG Partners a monthly fee of $ 150,000 , subject to proration for any partial month (but continuing for a minimum of three months following commencement of the Term if the Term is ended by the Board for any reason other than for “cause”). MAG Partners is also eligible to receive a one-time cash sign-on bonus of $ 300,000 and, unless the Term is ended by the Board for “cause,” a one-time completion bonus of $ 200,000 at the end of the Term (but no later than March 12, 2021). In addition, the Company has granted to MAG Partners fully vested stock options to purchase up to 230,000 shares of common stock with an exercise price of $ 14.39 per share, and up to 100,000 shares of common stock with an exercise price of $ 20.00 per share, pursuant to a Stock Option Agreement by and between MAG Partners and the Company (the “Option Agreement”). However, the options, and any shares received upon exercise, will terminate and be forfeited if the Board ends the Term for “cause” or MAG Partners terminates its arrangement with the Company (including a resignation by Ms. Gilmartin of her appointment as interim Chief Executive Officer, but excluding a termination because of a material breach of the arrangement by the Company or because Ms. Gilmartin has been appointed as the permanent Chief Executive Officer of the Company) before six months have elapsed, or if MAG Partners fails to comply with certain covenants in the Letter Agreement. 157,505 of the options have been granted subject to shareholder approval at the Company’s 2021 Annual Meeting of Stockholders; however, if a “change in control” transaction occurs before the date of such 2021 Annual Meeting, then such options would instead be canceled and cashed out upon such transaction for a value equal to their “spread value,” if any. During the Term, Ms. Gilmartin will not receive any additional fees or other compensation for her service (excluding equity previously granted) as a director on the Company’s Board or on the Roseland Residential Trust board of directors. However, the Company will reimburse MAG Partners for up to $ 10,000 in legal fees incurred in connection with negotiating the arrangements described above. In September 2020, the Company terminated without cause Nicholas Hilton, its Executive Vice President of Leasing, and Deidre Crockett, its Chief Administrative Officer, pursuant to their respective employment agreements and associated equity award agreements with the Company. During the year ended December 31, 2020, the Company’s total costs incurred, net of LTIP forfeitures, related to the management restructuring activities discussed above, including the severance, separation and related costs for the departure of the Company’s former chief executive officer and other executive officers, as well as other terminated employees, amounted to $ 11.9 million ($ 10.1 million included in general and administrative expense, and $ 1.8 million included in the operating services). OTHER On November 3, 2020, the General Partner entered into amended and restated employment agreements with each of David Smetana, the General Partner’s Chief Financial Officer, Ricardo Cardoso, the General Partner’s Executive Vice President and Chief Investment Officer, Gary T. Wagner, the General Partner’s General Counsel and Secretary, and Giovanni M. DeBari, the General Partner’s Chief Accounting Officer (each, an “Employment Agreement” and, collectively, the “Employment Agreements”). Each of the Employment Agreements with Messrs. Smetana, Cardoso, Wagner and DeBari (each, an “Executive”) provides as follows:  An initial term through December 31, 2022;  An annual base salary of $ 550,000 for Mr. Cardoso and $ 450,000 for Messrs. Smetana, Wagner and DeBari;  An annual cash bonus opportunity to be based on performance goals to be established annually by the General Partner’s board of directors or the executive compensation and option committee of the board of directors, with bonus opportunities for 2021 of (a) 50 % of base salary for threshold performance for Messrs. Smetana, Cardoso and Wagner and 20 % of base salary for threshold performance for Mr. DeBari, (b) 100 % of base salary for target performance for Messrs. Smetana, Cardoso and Wagner and 40 % of base salary for target performance for M. DeBari, and (c) 200 % of base salary for maximum performance for Mr. Cardoso, 150 % of base salary for maximum performance for Messrs. Smetana and Wagner, and 60 % of base salary for maximum performance for Mr. DeBari;  During the term of the employment agreement, eligibility to be granted long-term incentive or equity awards as may be determined by the General Partner’s board of directors or the executive compensation and option committee of the board of directors, provided that for 2021 and 2022, Mr. Cardoso shall be eligible to receive an award of long-term incentive plan (“LTIP”) units of limited partnership interests (“LTIP Units”) of the Company with a target grant date value of $ 2 million, which LTIP Units may be earned from 0 % to 200 % based on the aggregate gross sales price of office properties sold from August 1, 2020 to December 31, 2022 for not less than 85 % of its estimated net asset value, with threshold performance of $ 500 million in sales volume, target performance of $ 700 million in sales volume and maximum performance of $ 900 million in sales volume, with linear interpolation of payouts between performance levels. Accordingly, in January 2021, 334,449 LTIP Units were granted to Mr. Cardoso (See Note 6: Mack-Cali Realty Corporation Stockholders’ Equity and Mack-Cali Realty, L.P.’s Partners’ Capital).  Upon a termination on account of death or disability, the Executive, or his beneficiaries in the case of death, will receive payments (payable as and when such amounts would have been payable had the Executive’s employment not ended) consisting of accrued and unpaid base salary, expense reimbursement and benefits under the General Partner’s health and welfare plans through the termination date, any earned but unpaid annual bonus for the previous year, plus a prorated portion of the annual bonus payable for the year of such termination based on actual performance for such year; and  Upon a termination without “cause” (as defined in each of the Employment Agreements) or by the executive for “good reason” (as defined in each of the Employment Agreements) during the term of the applicable Employment Agreement, subject to the Executive signing a release in the form attached to each of the Employment Agreements, the Executive will be entitled to the same benefits as in the event of a termination due to death or disability, plus (a) a lump sum cash payment equal to one and one-half (1.5) times the sum of the Executive’s (i) annual base salary immediately prior to the termination date and (ii) target annual bonus for the year of such termination and (b) COBRA payments for up to 18 months after termination; provided, however, that if such termination occurs during a “change in control period” (as defined in each of the Employment Agreements), the lump sum payment described in clause (a) above shall be equal to two (2.0) times the sum of Executive’s (i) annual base salary immediately prior to the termination date and (ii) target annual bonus for the year of such termination.  Under each of the Employment Agreements, each Executive will be subject to certain restrictive covenants, including non-competition and non-solicitation covenants during his employment with the General Partner and for one year after termination of employment, in each case in circumstances in which the Executive is entitled to receive severance benefits under his Employment Agreement following the termination of employment. In addition, each Executive will be entitled to customary employee benefits under the Company’s health and welfare plans. Through February 2016, the Company could not dispose of or distribute certain of its properties, which were originally contributed by certain unrelated common unitholders of the Operating Partnership, without the express written consent of such common unitholders, as applicable, except in a manner which did not result in recognition of any built-in-gain (which may result in an income tax liability) or which reimbursed the appropriate specific common unitholders for the tax consequences of the recognition of such built-in-gains (collectively, the “Property Lock-Ups”). Upon the expiration in February 2016 of the Property Lock-Ups, the Company is generally required to use commercially reasonable efforts to prevent any sale, transfer or other disposition of the subject properties from resulting in the recognition of built-in gain to the specific common unitholders, which include members of the Mack Group (which includes William L. Mack, a former director; David S. Mack, a former director; and Earle I. Mack, a former director), the Robert Martin Group, and the Cali Group (which includes John R. Cali, a former director). As of December 31, 2020, after the effects of tax-free exchanges on certain of the originally contributed properties, either wholly or partially, over time, 16 of the Company’s properties, as well as certain land and development projects, including properties classified as held for sale as of December 31, 2020, with an aggregate carrying value of approximately $ 1.5 billion, are subject to these conditions. As of December 31, 2020, the Company has outstanding stay-on award agreements to 38 select employees, which provides them with the potential to receive compensation, in cash or Company stock, contingent upon remaining with the Company in good standing until the occurrence of certain corporate transactions, which have not been identified. The total potential cost of such awards is estimated to be up to approximately $ 5.2 million, including the potential issuance of 116,043 shares of the Company’s common stock. Such cash or stock awards would only be earned and payable if such transaction was identified and communicated to the employee within seven years of the agreement date, and all other conditions were satisfied. In September 2020, the General Partner's Board of Directors approved a discretionary reimbursement of approximately $ 6.1 million in fees and expenses incurred by Bow Street LLC in connection with its proxy solicitations in 2019 and 2020 that resulted in the election of Bow Street's nominees as directors of the General Partner at the 2019 and 2020 annual meetings of stockholders of the General Partner. The Board of Directors determined that the reimbursement was appropriate in light of the benefit to the General Partner and its stockholders of the refreshment of the Board of Directors that resulted from the proxy contests. The Company intends to reimburse this amount to Bow Street in three substantially equal payments in November 2020, January 2021 and April 2021, which the Company has recorded the $ 6.1 million as general and administrative expense for the year ended December 31, 2020. Bow Street is an affiliate of A. Akiva Katz, a director of the General Partner, who is a co-founder and managing partner of Bow Street. Payments of $ 2.1 million were made to Bow Street in November 2020 and of $ 2.0 million in January 2021. $ 2.0 million is expected to be paid to it in April 2021.
Mack-Cali Realty LP [Member]
Commitments And Contingencies [Line Items]
Commitments And Contingencies	13. COMMITMENTS AND CONTINGENCIES TAX ABATEMENT AGREEMENTS Pursuant to agreements with certain municipalities, the Company is required to make payments in lieu of property taxes (“PILOT”) on certain of its properties and has tax abatement agreements on other properties, as follows: The Harborside Plaza 4-A agreement with the City of Jersey City, as amended, which commenced in 2002, is for a term of 20 years. The annual PILOT is equal to two percent of Total Project Costs, as defined. Total Project Costs are $ 49.5 million. The PILOT totaled $ 1.1 million, $ 1.1 million and $ 1.1 million for the years ended December 31, 2020, 2019 and 2018, respectively. The Harborside Plaza 5 agreement, also with the City of Jersey City, as amended, which commenced in 2002, is for a term of 20 years. The annual PILOT is equal to two percent of Total Project Costs, as defined. Total Project Costs are $ 170.9 million. The PILOT totaled $ 4.4 million, $ 4.4 million and $ 4.4 million for the years ended December 31, 2020, 2019 and 2018, respectively. The Port Imperial South 1/3 Garage development project agreement with the City of Weehawken has a term of five years beginning when the project is substantially complete, which occurred in the fourth quarter of 2015. The agreement provides that real estate taxes be paid at 100 percent on the land value of the project only over the five year period and allows for a phase in of real estate taxes on the building improvement value at zero percent in year one and 95 percent in years two through five. The Port Imperial Hotel development project agreement with the City of Weehawken is for a term of 15 years following substantial completion, which occurred in December 2018. The annual PILOT is equal to two percent of Total Project Costs, as defined therein. The PILOT totaled $ 2.2 million and $ 2.2 million for the year ended December 31, 2020 and 2019, respectively. The Port Imperial South 11 development project agreement with the City of Weehawken is for a term of 15 years following substantial completion, which occurred in August 2018. The annual PILOT is equal to 10 percent of Gross Revenues, as defined therein. The PILOT totaled $ 1.1 million and $ 1.0 million for the year ended December 31, 2020 and 2019, respectively. The 111 River Realty agreement with the City of Hoboken, which commenced on October 1, 2001 expires in April 2022. The annual PILOT payment is a fixed amount until expiration. The PILOT totaled $ 1.4 million, $ 1.4 million and $ 1.4 million for the years ended December 31, 2020, 2019 and 2018, respectively. The Monaco Towers agreement with the City of Jersey City, which commenced in 2011, is for a term of 10 years. The annual PILOT is equal to 10 percent of gross revenues, as defined. The PILOT totaled $ 1.8 million, $ 2.1 million and $ 2.4 million for the years ended December 31, 2020, 2019 and 2018, respectively. The Marbella II agreement with the City of Jersey City, which commenced in 2016, is for a term of 10 years. The annual PILOT is equal to 10 percent of gross revenues for years 1-4, 12 percent of gross revenues for years 5-8 and 14 percent of gross revenue for years 9-10, as defined therein. The PILOT totaled $1.2 million and $ 1.4 million for the year ended December 31, 2020 and 2019, respectively. The Port Imperial Parcel South 9 development project agreement with the City of Weehawken is for a term of 25 years following substantial completion, which is anticipated to occur in the first quarter 2021. The annual PILOT is equal to 11 percent of gross revenue for years 1-10, 12.5 percent for years 11-18 and 14 percent for years 19-25, as defined therein. The Port Imperial South Park Parcel development project agreement with the Township of Weehawken is for a term of 25 years following substantial completion. The project is anticipated to begin construction in late 2021 with Substantial Completion in 2024. The annual PILOT is equal to 10 percent of Gross Revenues, as defined therein. At the conclusion of the above-referenced agreements, it is expected that the properties will be assessed by the municipality and be subject to real estate taxes at the then prevailing rates. LITIGATION The Company is a defendant in litigation arising in the normal course of its business activities. Management does not believe that the ultimate resolution of these matters will have a materially adverse effect upon the Company’s financial condition taken as whole. GROUND LEASE AGREEMENTS Future minimum rental payments under the terms of all non-cancelable ground leases under which the Company is the lessee, as of December 31, 2020, are as follows (dollars in thousands): As of December 31, 2020 Year Amount 2021 $ 1,750 2022 1,750 2023 1,756 2024 1,776 2025 1,742 2026 through 2101 152,980 Total lease payments 161,754 Less: imputed interest ( 138,152 ) Total $ 23,602 As of December 31, 2019 Year Amount 2020 $ 1,750 2021 1,750 2022 1,750 2023 1,756 2024 1,776 2025 through 2098 154,722 Total lease payments 163,504 Less: imputed interest ( 139,748 ) Total $ 23,756 Ground lease expense incurred by the Company during the years ended December 31, 2020, 2019 and 2018 amounted to $ 1.6 million, $ 2.6 million and $ 2.3 million, respectively. In conjunction with the adoption of ASU 2016-02 (Topic 842), starting on January 1, 2019, the Company capitalized operating leases, which had a balance of $ 22.3 million at December 31, 2020 for three ground leases. Such amount represents the net present value (“NPV”) of future payments detailed above. The incremental borrowing rates used to arrive at the NPV ranged from 7.576 percent to 7.618 percent for the remaining ground lease terms ranging from 80.83 years to 82.58 years. These rates were arrived at by adjusting the fixed rates of the Company’s mortgage debt with debt having terms approximating the remaining lease term of the Company’s ground leases and calculating notional rates for fully-collateralized loans. CONSTRUCTION PROJECTS The Company is developing a 313 -unit multi-family project known as Port Imperial South 9 at Port Imperial in Weehawken, New Jersey, which began construction in third quarter 2018. The construction project, which is estimated to cost $ 143.8 million, of which construction costs of $ 98.1 million have been incurred through December 31, 2020, is expected to be ready for occupancy early 2021 . The Company has funded $ 51.8 million as of December 31, 2020, and the remaining construction costs are expected to be funded from a $ 92 million construction loan (of which $ 46.3 million was drawn as of December 31, 2020). The Company is developing a 198 -unit multi-family project known as the Upton at Short Hills located in Short Hills, New Jersey, which began construction in fourth quarter 2018. The construction project, which is estimated to cost $ 99.4 million, of which $ 77.9 million has been incurred through December 31, 2020, is expected to be ready for occupancy in first quarter 2021 . The Company has funded $ 35.4 million of the construction costs, and the remaining construction costs are expected to be funded from a $ 64 million construction loan (of which $ 42.5 million was drawn as of December 31, 2020). The Company is developing a 750 -unit multi-family project at 25 Christopher Columbus in Jersey City, New Jersey, which began construction in first quarter 2019. The construction project, which is estimated to cost $ 469.5 million, of which $ 331 million has been incurred through December 31, 2020, is expected to be ready for occupancy in first quarter 2022 . The Company has funded $ 169.5 million of the construction costs, and the remaining construction costs are expected to be funded from a $ 300 million construction loan (of which $ 161.5 million was drawn as of December 31, 2020). MANAGEMENT CHANGES On July 24, 2020, the Company terminated Michael J. DeMarco as its Chief Executive Officer without cause, pursuant to his employment agreement and the associated equity award agreements he has with the Company. On August 8, 2020, the Company entered into a Consulting and Cooperating Agreement with Mr. DeMarco (the “Consulting Agreement”). Pursuant to the Consulting Agreement, in exchange for Mr. DeMarco’s providing certain consulting, cooperation, and transition services to the Company through December 31, 2020, Mr. DeMarco was considered to have remained employed with the Company through the term of the Consulting Agreement solely for purposes of calculating the prorated vesting of outstanding time-based long-term incentive partnership units to which Mr. DeMarco was entitled upon his termination of employment with the Company. Mr. DeMarco is eligible to receive the severance payments and benefits upon such a termination without cause (outside of a change in control) described under the heading “Employment Contracts; Potential Payments Upon Termination or Change in Control—Michael J. DeMarco Employment Agreement,” “—Michael J. DeMarco Class AO LTIP Award Agreement,” and “—Long-Term Incentive Plan Award Agreements,” each as set forth in the Company’s definitive revised proxy statement filed with the Securities and Exchange Commission on June 16, 2020, which description is incorporated by reference herein, and taking into account Mr. DeMarco’s target bonus percentage of 175 % of base salary established for the year 2020. Effective as of July 25, 2020, the Board of Directors appointed MaryAnne Gilmartin, the Chair of the Company’s Board of Directors, as interim Chief Executive Officer of the Company. Ms. Gilmartin will continue to serve as Chair of the Board, but has resigned as a member of the Nominating & Corporate Governance Committee of the Board. Concurrently, Tammy K. Jones, a current director, was appointed to serve as the lead independent director on the Board. In connection with Ms. Gilmartin’s appointment, the Company has entered into a letter agreement (the “Letter Agreement”) with MAG Partners 2.0 LLC (“MAG Partners”), an entity wholly owned by Ms. Gilmartin. Pursuant to the Letter Agreement, MAG Partners has agreed to make Ms. Gilmartin’s services available to the Company to serve as its interim Chief Executive Officer. The term of this arrangement and Ms. Gilmartin’s appointment as interim Chief Executive Officer (the “Term”) will continue until the earliest to occur of (i) the commencement of employment of a permanent Chief Executive Officer of the Company, (ii) a period of six months has elapsed, or an earlier or later date selected by the Board, and (iii) Ms. Gilmartin’s death or disability, or the termination of the arrangement by MAG Partners (including a resignation by Ms. Gilmartin of her appointment as interim Chief Executive Officer). On January 22, 2021, the Company entered into a six -month extension (the “Extension Letter”) of the Letter Agreement with MAG Partners, pursuant to which MAG Partners has made Ms. Gilmartin’s services available to the Company to serve as its interim Chief Executive Officer. Pursuant to the Extension Letter, the term of the Letter Agreement has been extended until July 25, 2021 (the “Extended Term”). However, Ms. Gilmartin’s appointment as interim Chief Executive Officer will end upon the earlier to occur of (x) the commencement of employment of a permanent Chief Executive Officer of the Company or (y) a date selected by the Board of Directors of the Company, and during any remaining portion of the Extended Term, MAG Partners will continue to make Ms. Gilmartin reasonably available to assist with the transition of Ms. Gilmartin’s duties to her successor and with any other matters that the Company may reasonably request. In addition, if the Extended Term ends at any time prior to July 25, 2021 (other than a termination by the Company for cause), then the Company will continue to pay MAG Partners its monthly $ 150,000 cash retainer fee through July 25, 2021. Pursuant to the Letter Agreement, during the Term the Company will pay to MAG Partners a monthly fee of $ 150,000 , subject to proration for any partial month (but continuing for a minimum of three months following commencement of the Term if the Term is ended by the Board for any reason other than for “cause”). MAG Partners is also eligible to receive a one-time cash sign-on bonus of $ 300,000 and, unless the Term is ended by the Board for “cause,” a one-time completion bonus of $ 200,000 at the end of the Term (but no later than March 12, 2021). In addition, the Company has granted to MAG Partners fully vested stock options to purchase up to 230,000 shares of common stock with an exercise price of $ 14.39 per share, and up to 100,000 shares of common stock with an exercise price of $ 20.00 per share, pursuant to a Stock Option Agreement by and between MAG Partners and the Company (the “Option Agreement”). However, the options, and any shares received upon exercise, will terminate and be forfeited if the Board ends the Term for “cause” or MAG Partners terminates its arrangement with the Company (including a resignation by Ms. Gilmartin of her appointment as interim Chief Executive Officer, but excluding a termination because of a material breach of the arrangement by the Company or because Ms. Gilmartin has been appointed as the permanent Chief Executive Officer of the Company) before six months have elapsed, or if MAG Partners fails to comply with certain covenants in the Letter Agreement. 157,505 of the options have been granted subject to shareholder approval at the Company’s 2021 Annual Meeting of Stockholders; however, if a “change in control” transaction occurs before the date of such 2021 Annual Meeting, then such options would instead be canceled and cashed out upon such transaction for a value equal to their “spread value,” if any. During the Term, Ms. Gilmartin will not receive any additional fees or other compensation for her service (excluding equity previously granted) as a director on the Company’s Board or on the Roseland Residential Trust board of directors. However, the Company will reimburse MAG Partners for up to $ 10,000 in legal fees incurred in connection with negotiating the arrangements described above. In September 2020, the Company terminated without cause Nicholas Hilton, its Executive Vice President of Leasing, and Deidre Crockett, its Chief Administrative Officer, pursuant to their respective employment agreements and associated equity award agreements with the Company. During the year ended December 31, 2020, the Company’s total costs incurred, net of LTIP forfeitures, related to the management restructuring activities discussed above, including the severance, separation and related costs for the departure of the Company’s former chief executive officer and other executive officers, as well as other terminated employees, amounted to $ 11.9 million ($ 10.1 million included in general and administrative expense, and $ 1.8 million included in the operating services). OTHER On November 3, 2020, the General Partner entered into amended and restated employment agreements with each of David Smetana, the General Partner’s Chief Financial Officer, Ricardo Cardoso, the General Partner’s Executive Vice President and Chief Investment Officer, Gary T. Wagner, the General Partner’s General Counsel and Secretary, and Giovanni M. DeBari, the General Partner’s Chief Accounting Officer (each, an “Employment Agreement” and, collectively, the “Employment Agreements”). Each of the Employment Agreements with Messrs. Smetana, Cardoso, Wagner and DeBari (each, an “Executive”) provides as follows:  An initial term through December 31, 2022;  An annual base salary of $ 550,000 for Mr. Cardoso and $ 450,000 for Messrs. Smetana, Wagner and DeBari;  An annual cash bonus opportunity to be based on performance goals to be established annually by the General Partner’s board of directors or the executive compensation and option committee of the board of directors, with bonus opportunities for 2021 of (a) 50 % of base salary for threshold performance for Messrs. Smetana, Cardoso and Wagner and 20 % of base salary for threshold performance for Mr. DeBari, (b) 100 % of base salary for target performance for Messrs. Smetana, Cardoso and Wagner and 40 % of base salary for target performance for M. DeBari, and (c) 200 % of base salary for maximum performance for Mr. Cardoso, 150 % of base salary for maximum performance for Messrs. Smetana and Wagner, and 60 % of base salary for maximum performance for Mr. DeBari;  During the term of the employment agreement, eligibility to be granted long-term incentive or equity awards as may be determined by the General Partner’s board of directors or the executive compensation and option committee of the board of directors, provided that for 2021 and 2022, Mr. Cardoso shall be eligible to receive an award of long-term incentive plan (“LTIP”) units of limited partnership interests (“LTIP Units”) of the Company with a target grant date value of $ 2 million, which LTIP Units may be earned from 0 % to 200 % based on the aggregate gross sales price of office properties sold from August 1, 2020 to December 31, 2022 for not less than 85 % of its estimated net asset value, with threshold performance of $ 500 million in sales volume, target performance of $ 700 million in sales volume and maximum performance of $ 900 million in sales volume, with linear interpolation of payouts between performance levels. Accordingly, in January 2021, 334,449 LTIP Units were granted to Mr. Cardoso (See Note 6: Mack-Cali Realty Corporation Stockholders’ Equity and Mack-Cali Realty, L.P.’s Partners’ Capital).  Upon a termination on account of death or disability, the Executive, or his beneficiaries in the case of death, will receive payments (payable as and when such amounts would have been payable had the Executive’s employment not ended) consisting of accrued and unpaid base salary, expense reimbursement and benefits under the General Partner’s health and welfare plans through the termination date, any earned but unpaid annual bonus for the previous year, plus a prorated portion of the annual bonus payable for the year of such termination based on actual performance for such year; and  Upon a termination without “cause” (as defined in each of the Employment Agreements) or by the executive for “good reason” (as defined in each of the Employment Agreements) during the term of the applicable Employment Agreement, subject to the Executive signing a release in the form attached to each of the Employment Agreements, the Executive will be entitled to the same benefits as in the event of a termination due to death or disability, plus (a) a lump sum cash payment equal to one and one-half (1.5) times the sum of the Executive’s (i) annual base salary immediately prior to the termination date and (ii) target annual bonus for the year of such termination and (b) COBRA payments for up to 18 months after termination; provided, however, that if such termination occurs during a “change in control period” (as defined in each of the Employment Agreements), the lump sum payment described in clause (a) above shall be equal to two (2.0) times the sum of Executive’s (i) annual base salary immediately prior to the termination date and (ii) target annual bonus for the year of such termination.  Under each of the Employment Agreements, each Executive will be subject to certain restrictive covenants, including non-competition and non-solicitation covenants during his employment with the General Partner and for one year after termination of employment, in each case in circumstances in which the Executive is entitled to receive severance benefits under his Employment Agreement following the termination of employment. In addition, each Executive will be entitled to customary employee benefits under the Company’s health and welfare plans. Through February 2016, the Company could not dispose of or distribute certain of its properties, which were originally contributed by certain unrelated common unitholders of the Operating Partnership, without the express written consent of such common unitholders, as applicable, except in a manner which did not result in recognition of any built-in-gain (which may result in an income tax liability) or which reimbursed the appropriate specific common unitholders for the tax consequences of the recognition of such built-in-gains (collectively, the “Property Lock-Ups”). Upon the expiration in February 2016 of the Property Lock-Ups, the Company is generally required to use commercially reasonable efforts to prevent any sale, transfer or other disposition of the subject properties from resulting in the recognition of built-in gain to the specific common unitholders, which include members of the Mack Group (which includes William L. Mack, a former director; David S. Mack, a former director; and Earle I. Mack, a former director), the Robert Martin Group, and the Cali Group (which includes John R. Cali, a former director). As of December 31, 2020, after the effects of tax-free exchanges on certain of the originally contributed properties, either wholly or partially, over time, 16 of the Company’s properties, as well as certain land and development projects, including properties classified as held for sale as of December 31, 2020, with an aggregate carrying value of approximately $ 1.5 billion, are subject to these conditions. As of December 31, 2020, the Company has outstanding stay-on award agreements to 38 select employees, which provides them with the potential to receive compensation, in cash or Company stock, contingent upon remaining with the Company in good standing until the occurrence of certain corporate transactions, which have not been identified. The total potential cost of such awards is estimated to be up to approximately $ 5.2 million, including the potential issuance of 116,043 shares of the Company’s common stock. Such cash or stock awards would only be earned and payable if such transaction was identified and communicated to the employee within seven years of the agreement date, and all other conditions were satisfied. In September 2020, the General Partner's Board of Directors approved a discretionary reimbursement of approximately $ 6.1 million in fees and expenses incurred by Bow Street LLC in connection with its proxy solicitations in 2019 and 2020 that resulted in the election of Bow Street's nominees as directors of the General Partner at the 2019 and 2020 annual meetings of stockholders of the General Partner. The Board of Directors determined that the reimbursement was appropriate in light of the benefit to the General Partner and its stockholders of the refreshment of the Board of Directors that resulted from the proxy contests. The Company intends to reimburse this amount to Bow Street in three substantially equal payments in November 2020, January 2021 and April 2021, which the Company has recorded the $ 6.1 million as general and administrative expense for the year ended December 31, 2020. Bow Street is an affiliate of A. Akiva Katz, a director of the General Partner, who is a co-founder and managing partner of Bow Street. Payments of $ 2.1 million were made to Bow Street in November 2020 and of $ 2.0 million in January 2021. $ 2.0 million is expected to be paid to it in April 2021.

Tenant Leases

Tenant Leases	12 Months Ended
	Dec. 31, 2020
Leases [Line Items]
Tenant Leases	14. TENANT LEASES The Properties are leased to tenants under operating leases with various expiration dates through 2041 . Substantially all of the commercial leases provide for annual base rents plus recoveries and escalation charges based upon the tenant’s proportionate share of and/or increases in real estate taxes and certain operating costs, as defined, and the pass - through of charges for electrical usage. Future minimum rentals to be received under non-cancelable commercial operating leases (excluding properties classified as discontinued operations) at December 31, 2020 and 2019 are as follows (dollars in thousands) : As of December 31, 2020 Year Amount 2021 117,228 2022 114,101 2023 108,406 2024 92,605 2025 88,309 2026 and thereafter 462,920 Total $ 983,569 As of December 31, 2019 Year Amount 2020 $ 115,418 2021 107,027 2022 103,417 2023 99,544 2024 88,082 2025 and thereafter 488,305 Total $ 1,001,793 Multi-family rental property residential leases are excluded from the above table as they generally expire within one year .
Mack-Cali Realty LP [Member]
Leases [Line Items]
Tenant Leases	14. TENANT LEASES The Properties are leased to tenants under operating leases with various expiration dates through 2041 . Substantially all of the commercial leases provide for annual base rents plus recoveries and escalation charges based upon the tenant’s proportionate share of and/or increases in real estate taxes and certain operating costs, as defined, and the pass - through of charges for electrical usage. Future minimum rentals to be received under non-cancelable commercial operating leases (excluding properties classified as discontinued operations) at December 31, 2020 and 2019 are as follows (dollars in thousands) : As of December 31, 2020 Year Amount 2021 117,228 2022 114,101 2023 108,406 2024 92,605 2025 88,309 2026 and thereafter 462,920 Total $ 983,569 As of December 31, 2019 Year Amount 2020 $ 115,418 2021 107,027 2022 103,417 2023 99,544 2024 88,082 2025 and thereafter 488,305 Total $ 1,001,793 Multi-family rental property residential leases are excluded from the above table as they generally expire within one year .

Redeemable Noncontrolling Inter

Redeemable Noncontrolling Interests	12 Months Ended
	Dec. 31, 2020
Redeemable Noncontrolling Interest [Line Items]
Redeemable Noncontrolling Interests	15. REDEEMABLE NONCONTROLLING INTERESTS The Company evaluates the terms of the partnership units issued in accordance with the FASB’s Distinguishing Liabilities from Equity guidance. Units which embody an unconditional obligation requiring the Company to redeem the units for cash after a specified or determinable date (or dates) or upon the occurrence of an event that is not solely within the control of the issuer are determined to be contingently redeemable under this guidance and are included as Redeemable noncontrolling interests and classified within the mezzanine section between Total liabilities and Stockholders’ equity on the Company’s Consolidated Balance Sheets. Convertible units for which the Company has the option to settle redemption amounts in cash or Common Stock are included in the caption Noncontrolling interests in subsidiaries within the equity section on the Company’s Consolidated Balance Sheet. Rockpoint Transaction On February 27, 2017, the Company, Roseland Residential Trust (“RRT”), the Company’s subsidiary through which the Company conducts its multi-family residential real estate operations, Roseland Residential, L.P. (“RRLP”), the operating partnership through which RRT conducts all of its operations, and certain other affiliates of the Company entered into a preferred equity investment agreement (the “Original Investment Agreement”) with certain affiliates of Rockpoint Group, L.L.C. (Rockpoint Group, L.L.C. and its affiliates, collectively, “Rockpoint”). The Original Investment Agreement provided for RRT to contribute property to RRLP in exchange for common units of limited partnership interests in RRLP (the “Common Units”) and for multiple equity investments by Rockpoint in RRLP from time to time for up to an aggregate of $ 300 million of preferred units of limited partnership interests in RRLP (the “Preferred Units”). The initial closing under the Original Investment Agreement occurred on March 10, 2017 for $ 150 million of Preferred Units and the parties agreed that the Company’s contributed equity value (“RRT Contributed Equity Value”), was $ 1.23 billion at closing. During the year ended December 31, 2018, a total additional amount of $ 105 million of Preferred Units were issued and sold to Rockpoint pursuant to the Original Investment Agreement. During the three months ended March 31, 2019, a total additional amount of $ 45 million of Preferred Units were issued and sold to Rockpoint pursuant to the Original Investment Agreement, which brought the Preferred Units to the full balance of $ 300 million . In addition, certain contributions of property to RRLP by RRT subsequent to the execution of the Original Investment Agreement resulted in RRT being issued approximately $ 46 million of Preferred Units and Common Units in RRLP prior to June 26, 2019. On June 26, 2019, the Company, RRT, RRLP, certain other affiliates of the Company and Rockpoint entered into an additional preferred equity investment agreement (the “Add On Investment Agreement”). The closing under the Add On Investment Agreement occurred on June 28, 2019. Pursuant to the Add On Investment Agreement, Rockpoint invested an additional $ 100 million in Preferred Units and the Company and RRT agreed to contribute to RRLP two additional properties located in Jersey City, New Jersey. The Company used the $100 million in proceeds received to repay outstanding borrowings under its unsecured revolving credit facility and other debt by June 30, 2019. In addition, Rockpoint has a right of first refusal to invest another $ 100 million in Preferred Units in the event RRT determines that RRLP requires additional capital prior to March 1, 2023 and, subject thereto, RRLP may issue up to approximately $ 154 million in Preferred Units to RRT or an affiliate so long as at the time of such funding RRT determines in good faith that RRLP has a valid business purpose to use such proceeds. Included in general and administrative expenses for the year ended December 31, 2019 were $ 371,000 in fees associated with the modifications of the Original Investment Agreement, which were made upon signing of the Add On Investment Agreement. Under the terms of the new transaction with Rockpoint, the cash flow from operations of RRLP will be distributable to Rockpoint and RRT as follows:  first, to provide a 6 % annual return to Rockpoint and RRT on their capital invested in Preferred Units (the “Preferred Base Return”);  second, 95.36 % to RRT and 4.64 % to Rockpoint until RRT has received a 6 % annual return (the “RRT Base Return”) on the equity value of the properties contributed by it to RRLP in exchange for Common Units (previously 95 % and 5 %, respectively, under the Original Investment Agreement), subject to adjustment in the event RRT contributes additional property to RRLP in the future; and  third, pro rata to Rockpoint and RRT based on total respective capital invested in and contributed equity value of Preferred Units and Common Units (based on Rockpoint’s $ 400 million of invested capital at December 31, 2020, this pro rata distribution would be approximately 21.89 % to Rockpoint in respect of Preferred Units, 2.65 % to RRT in respect of Preferred Units and 75.46 % to RRT in respect of Common Units). RRLP’s cash flow from capital events will generally be distributable by RRLP to Rockpoint and RRT as follows:  first, to Rockpoint and RRT to the extent there is any unpaid, accrued Preferred Base Return;  second, as a return of capital to Rockpoint and to RRT in respect of Preferred Units;  third, 95.36 % to RRT and 4.64 % to Rockpoint until RRT has received the RRT Base Return in respect of Common Units (previously 95 % and 5 %, respectively, under the Original Investment Agreement), subject to adjustment in the event RRT contributes additional property to RRLP in the future;  fourth, 95.36 % to RRT and 4.64 % to Rockpoint until RRT has received a return of capital based on the equity value of the properties contributed by it to RRLP in exchange for Common Units (previously 95 % and 5 %, respectively, under the Original Investment Agreement), subject to adjustment in the event RRT contributes additional property to the capital of RRLP in the future;  fifth, pro rata to Rockpoint and RRT based on respective total capital invested in and contributed equity value of Preferred and Common Units until Rockpoint has received an 11 % internal rate of return (based on Rockpoint’s $ 400 million of invested capital at December 31, 2020, this pro rata distribution would be approximately 21.89 % to Rockpoint in respect of Preferred Units, 2.65 % to RRT in respect of Preferred Units and 75.46 % to RRT in respect of Common Units); and  sixth, to Rockpoint and RRT in respect of their Preferred Units based on 50 % of their pro rata shares described in “fifth” above and the balance to RRT in respect of its Common Units (based on Rockpoint’s $ 400 million of invested capital at December 31, 2020, this pro rata distribution would be approximately 10.947 % to Rockpoint in respect of Preferred Units, 1.325 % to RRT in respect of Preferred Units and 87.728 % to RRT in respect of Common Units). In general, RRLP may not sell its properties in taxable transactions, although it may engage in tax-deferred like-kind exchanges of properties or it may proceed in another manner designed to avoid the recognition of gain for tax purposes. In connection with the Add On Investment Agreement, on June 26, 2019, RRT increased the size of its board of trustees from six to seven persons, with five trustees being designated by the Company and two trustees being designated by Rockpoint. In addition, as was the case under the Original Investment Agreement, RRT and RRLP are required to obtain Rockpoint’s consent with respect to:  debt financings in excess of a 65 % loan-to-value ratio;  corporate level financings that are pari-passu or senior to the Preferred Units;  new investment opportunities to the extent the opportunity requires an equity capitalization in excess of 10 % of RRLP’s NAV;  new investment opportunities located in a Metropolitan Statistical Area where RRLP owns no property as of the previous quarter;  declaration of bankruptcy of RRT;  transactions between RRT and the Company, subject to certain limited exceptions;  any equity granted or equity incentive plan adopted by RRLP or any of its subsidiaries; and  certain matters relating to the Credit Enhancement Note (as defined below) between the Company and RRLP (other than ordinary course borrowings or repayments thereunder). Under a Discretionary Demand Promissory Note (the “Credit Enhancement Note”), the Company may provide periodic cash advances to RRLP. The Credit Enhancement Note provides for an interest rate equal to the London Inter-Bank Offered Rate plus fifty ( 50 ) basis points above the applicable interest rate under the Company’s unsecured revolving credit facility. The maximum aggregate principal amount of advances at any one time outstanding under the Credit Enhancement Note is limited to $ 50 million, an increase of $ 25 million from the prior transaction. RRT and RRLP also have agreed, as was the case under the Original Investment Agreement, to register the Preferred Units under certain circumstances in the future in the event RRT or RRLP becomes a publicly traded company. During the period commencing on June 28, 2019 and ending on March 1, 2023 (the “Lockout Period”), Rockpoint’s interest in the Preferred Units cannot be redeemed or repurchased, except in connection with (a) a sale of all or substantially all of RRLP or a sale of a majority of the then-outstanding interests in RRLP, in each case, which sale is not approved by Rockpoint, or (b) a spin-out or initial public offering of common stock of RRT, or distributions of RRT equity interests by the Company or its affiliates to shareholders or their respective parent interestholders (an acquisition pursuant clauses (a) or (b) above, an “Early Purchase”). RRT has the right to acquire Rockpoint’s interest in the Preferred Units in connection with an Early Purchase for a purchase price generally equal to (i) the amount that Rockpoint would receive upon the sale of the assets of RRLP for fair market value and a distribution of the net sale proceeds in accordance with (A) the capital event distribution priorities discussed above (in the case of certain Rockpoint Preferred Holders) and (B) the distribution priorities applicable in the case of a liquidation of RRLP (in the case of the other Rockpoint Preferred Holder), plus (ii) a make whole premium (such purchase price, the “Purchase Payment”). The make whole premium is an amount equal to (i) $ 173.5 million until December 28, 2020, or $ 198.5 million thereafter, less distributions theretofore made to Rockpoint with respect to its Preferred Base Return or any deficiency therein, plus (ii) $ 1.5 million less certain other distributions theretofore made to Rockpoint. The fair market value of RRLP’s assets is determined by a third party appraisal of the net asset value (“NAV”) of RRLP and the fair market value of RRLP’s assets, to be completed within ninety (90) calendar days of March 1, 2023 and annually thereafter. After the Lockout Period, either RRT may acquire from Rockpoint, or Rockpoint may sell to RRT, all, but not less than all, of Rockpoint’s interest in the Preferred Units (each, a “Put/Call Event”) for a purchase price equal to the Purchase Payment (determined without regard to the make whole premium and any related tax allocations). An acquisition of Rockpoint’s interest in the Preferred Units pursuant to a Put/Call Event is generally required to be structured as a purchase of the common equity in the applicable Rockpoint entities holding direct or indirect interests in the Preferred Units. Subject to certain exceptions, Rockpoint also has a right of first offer and a participation right with respect to other common equity interests of RRLP or any subsidiary of RRLP that may be offered for sale by RRLP or its subsidiaries from time to time. Upon a Put/Call Event, other than in the event of a sale of RRLP, Rockpoint may elect to convert all, but not less than all, of its Preferred Units to Common Units in RRLP. As such, the Preferred Units contain a substantive redemption feature that is outside of the Company’s control and accordingly, pursuant to ASC 480-1—S99-3A, the Preferred Units are classified in mezzanine equity measured based on the estimated future redemption value as of December 31, 2020. The Company determines the redemption value of these interests by hypothetically liquidating the estimated NAV of the RRT real estate portfolio including debt principal through the applicable waterfall provisions of the new transaction with Rockpoint. The estimation of NAV includes unobservable inputs that consider assumptions of market participants in pricing the underlying assets of RRLP. For properties under development, the Company applies a discount rate to the estimated future cash flows allocable to the Company during the period under construction and then applies a direct capitalization method to the estimated stabilized cash flows. For operating properties, the direct capitalization method is used by applying a capitalization rate to the projected net operating income. For developable land holdings, an estimated per-unit market value assumption is considered based on development rights for the land. Estimated future cash flows used in such analyses are based on the Company’s business plan for each respective property including capital expenditures, management’s views of market and economic conditions, and considers items such as current and future rental rates, occupancies and market transactions for comparable properties. The estimated future redemption value of the Preferred Units is approximately $ 476 million as of December 31, 2020. Preferred Units On February 3, 2017, the Operating Partnership issued 42,800 shares of a new class of 3.5 percent Series A Preferred Limited Partnership Units of the Operating Partnership (the “Series A Units”). The Series A Units were issued to the Company’s partners in the Plaza VIII & IX Associates L.L.C. joint venture that owns a development site adjacent to the Company’s Harborside property in Jersey City, New Jersey as non-cash consideration for their approximate 37.5 percent interest in the joint venture. Each Series A Unit has a stated value of $ 1,000 , pays dividends quarterly at an annual rate of 3.5 percent (subject to increase under certain circumstances), is convertible into 28.15 common units of limited partnership interests of the Operating Partnership beginning generally five years from the date of issuance, or an aggregate of up to 1,204,820 common units. The conversion rate was based on a value of $ 35.52 per common unit. The Series A Units have a liquidation and dividend preference senior to the common units and include customary anti-dilution protections for stock splits and similar events. The Series A Units are redeemable for cash at their stated value beginning five years from the date of issuance at the option of the holder. On February 28, 2017, the Operating Partnership authorized the issuance of 9,213 shares of a new class of 3.5 percent Series A-1 Preferred Limited Partnership Units of the Operating Partnership (the “Series A-1 Units”). 9,122 Series A-1 Units were issued on February 28, 2017 and an additional 91 Series A-1 Units were issued in April 2017 pursuant to acquiring additional interests in a joint venture that owns Monaco Towers in Jersey City, New Jersey. The Series A-1 Units were issued as non-cash consideration for the partner’s approximate 13.8 percent ownership interest in the joint venture. Each Series A-1 Unit has a stated value of $ 1,000 (the “Stated Value”), pays dividends quarterly at an annual rate equal to the greater of (x) 3.5 percent, or (y) the then-effective annual dividend yield on the General Partner’s common stock, and is convertible into 27.936 common units of limited partnership interests of the Operating Partnership beginning generally five years from the date of issuance, or an aggregate of up to 257,375 Common Units. The conversion rate was based on a value of $ 35.80 per common unit. The Series A-1 Units have a liquidation and dividend preference senior to the Common Units and include customary anti-dilution protections for stock splits and similar events. The Series A-1 Units are redeemable for cash at their stated value beginning five years from the date of issuance at the option of the holder. The Series A-1 Units are pari passu with the 42,800 3.5 % Series A Units issued on February 3, 2017. The following tables set forth the changes in Redeemable noncontrolling interests for the year ended December 31, 2020 (dollars in thousands) : Series A and Total A-1 Preferred Rockpoint Redeemable Units Interests Noncontrolling In MCRLP in RRT Interests Balance January 1, 2020 $ 52,324 $ 451,058 $ 503,382 Redeemable Noncontrolling Interests Issued - - - Net 52,324 451,058 503,382 Income Attributed to Noncontrolling Interests 1,820 24,063 25,883 Distributions ( 1,820 ) ( 24,063 ) ( 25,883 ) Other Distributions - ( 3,153 ) ( 3,153 ) Redemption Value Adjustment - 13,068 13,068 Redeemable noncontrolling interests as of December 31, 2020 $ 52,324 $ 460,973 $ 513,297 Series A and Total A-1 Preferred Rockpoint Redeemable Units Interests Noncontrolling In MCRLP in RRT Interests Balance January 1, 2019 $ 52,324 $ 278,135 $ 330,459 Redeemable Noncontrolling Interests Issued (net of new issuance costs of $ 1.5 million) - 143,450 143,450 Net 52,324 421,585 473,909 Income Attributed to Noncontrolling Interests 1,820 20,795 22,615 Distributions ( 1,820 ) ( 20,795 ) ( 22,615 ) Redemption Value Adjustment (including value adjustment attributable to Add On Investment Agreement) - 29,473 29,473 Redeemable noncontrolling interests as of December 31, 2019 $ 52,324 $ 451,058 $ 503,382
Mack-Cali Realty LP [Member]
Redeemable Noncontrolling Interest [Line Items]
Redeemable Noncontrolling Interests	15. REDEEMABLE NONCONTROLLING INTERESTS The Company evaluates the terms of the partnership units issued in accordance with the FASB’s Distinguishing Liabilities from Equity guidance. Units which embody an unconditional obligation requiring the Company to redeem the units for cash after a specified or determinable date (or dates) or upon the occurrence of an event that is not solely within the control of the issuer are determined to be contingently redeemable under this guidance and are included as Redeemable noncontrolling interests and classified within the mezzanine section between Total liabilities and Stockholders’ equity on the Company’s Consolidated Balance Sheets. Convertible units for which the Company has the option to settle redemption amounts in cash or Common Stock are included in the caption Noncontrolling interests in subsidiaries within the equity section on the Company’s Consolidated Balance Sheet. Rockpoint Transaction On February 27, 2017, the Company, Roseland Residential Trust (“RRT”), the Company’s subsidiary through which the Company conducts its multi-family residential real estate operations, Roseland Residential, L.P. (“RRLP”), the operating partnership through which RRT conducts all of its operations, and certain other affiliates of the Company entered into a preferred equity investment agreement (the “Original Investment Agreement”) with certain affiliates of Rockpoint Group, L.L.C. (Rockpoint Group, L.L.C. and its affiliates, collectively, “Rockpoint”). The Original Investment Agreement provided for RRT to contribute property to RRLP in exchange for common units of limited partnership interests in RRLP (the “Common Units”) and for multiple equity investments by Rockpoint in RRLP from time to time for up to an aggregate of $ 300 million of preferred units of limited partnership interests in RRLP (the “Preferred Units”). The initial closing under the Original Investment Agreement occurred on March 10, 2017 for $ 150 million of Preferred Units and the parties agreed that the Company’s contributed equity value (“RRT Contributed Equity Value”), was $ 1.23 billion at closing. During the year ended December 31, 2018, a total additional amount of $ 105 million of Preferred Units were issued and sold to Rockpoint pursuant to the Original Investment Agreement. During the three months ended March 31, 2019, a total additional amount of $ 45 million of Preferred Units were issued and sold to Rockpoint pursuant to the Original Investment Agreement, which brought the Preferred Units to the full balance of $ 300 million . In addition, certain contributions of property to RRLP by RRT subsequent to the execution of the Original Investment Agreement resulted in RRT being issued approximately $ 46 million of Preferred Units and Common Units in RRLP prior to June 26, 2019. On June 26, 2019, the Company, RRT, RRLP, certain other affiliates of the Company and Rockpoint entered into an additional preferred equity investment agreement (the “Add On Investment Agreement”). The closing under the Add On Investment Agreement occurred on June 28, 2019. Pursuant to the Add On Investment Agreement, Rockpoint invested an additional $ 100 million in Preferred Units and the Company and RRT agreed to contribute to RRLP two additional properties located in Jersey City, New Jersey. The Company used the $100 million in proceeds received to repay outstanding borrowings under its unsecured revolving credit facility and other debt by June 30, 2019. In addition, Rockpoint has a right of first refusal to invest another $ 100 million in Preferred Units in the event RRT determines that RRLP requires additional capital prior to March 1, 2023 and, subject thereto, RRLP may issue up to approximately $ 154 million in Preferred Units to RRT or an affiliate so long as at the time of such funding RRT determines in good faith that RRLP has a valid business purpose to use such proceeds. Included in general and administrative expenses for the year ended December 31, 2019 were $ 371,000 in fees associated with the modifications of the Original Investment Agreement, which were made upon signing of the Add On Investment Agreement. Under the terms of the new transaction with Rockpoint, the cash flow from operations of RRLP will be distributable to Rockpoint and RRT as follows:  first, to provide a 6 % annual return to Rockpoint and RRT on their capital invested in Preferred Units (the “Preferred Base Return”);  second, 95.36 % to RRT and 4.64 % to Rockpoint until RRT has received a 6 % annual return (the “RRT Base Return”) on the equity value of the properties contributed by it to RRLP in exchange for Common Units (previously 95 % and 5 %, respectively, under the Original Investment Agreement), subject to adjustment in the event RRT contributes additional property to RRLP in the future; and  third, pro rata to Rockpoint and RRT based on total respective capital invested in and contributed equity value of Preferred Units and Common Units (based on Rockpoint’s $ 400 million of invested capital at December 31, 2020, this pro rata distribution would be approximately 21.89 % to Rockpoint in respect of Preferred Units, 2.65 % to RRT in respect of Preferred Units and 75.46 % to RRT in respect of Common Units). RRLP’s cash flow from capital events will generally be distributable by RRLP to Rockpoint and RRT as follows:  first, to Rockpoint and RRT to the extent there is any unpaid, accrued Preferred Base Return;  second, as a return of capital to Rockpoint and to RRT in respect of Preferred Units;  third, 95.36 % to RRT and 4.64 % to Rockpoint until RRT has received the RRT Base Return in respect of Common Units (previously 95 % and 5 %, respectively, under the Original Investment Agreement), subject to adjustment in the event RRT contributes additional property to RRLP in the future;  fourth, 95.36 % to RRT and 4.64 % to Rockpoint until RRT has received a return of capital based on the equity value of the properties contributed by it to RRLP in exchange for Common Units (previously 95 % and 5 %, respectively, under the Original Investment Agreement), subject to adjustment in the event RRT contributes additional property to the capital of RRLP in the future;  fifth, pro rata to Rockpoint and RRT based on respective total capital invested in and contributed equity value of Preferred and Common Units until Rockpoint has received an 11 % internal rate of return (based on Rockpoint’s $ 400 million of invested capital at December 31, 2020, this pro rata distribution would be approximately 21.89 % to Rockpoint in respect of Preferred Units, 2.65 % to RRT in respect of Preferred Units and 75.46 % to RRT in respect of Common Units); and  sixth, to Rockpoint and RRT in respect of their Preferred Units based on 50 % of their pro rata shares described in “fifth” above and the balance to RRT in respect of its Common Units (based on Rockpoint’s $ 400 million of invested capital at December 31, 2020, this pro rata distribution would be approximately 10.947 % to Rockpoint in respect of Preferred Units, 1.325 % to RRT in respect of Preferred Units and 87.728 % to RRT in respect of Common Units). In general, RRLP may not sell its properties in taxable transactions, although it may engage in tax-deferred like-kind exchanges of properties or it may proceed in another manner designed to avoid the recognition of gain for tax purposes. In connection with the Add On Investment Agreement, on June 26, 2019, RRT increased the size of its board of trustees from six to seven persons, with five trustees being designated by the Company and two trustees being designated by Rockpoint. In addition, as was the case under the Original Investment Agreement, RRT and RRLP are required to obtain Rockpoint’s consent with respect to:  debt financings in excess of a 65 % loan-to-value ratio;  corporate level financings that are pari-passu or senior to the Preferred Units;  new investment opportunities to the extent the opportunity requires an equity capitalization in excess of 10 % of RRLP’s NAV;  new investment opportunities located in a Metropolitan Statistical Area where RRLP owns no property as of the previous quarter;  declaration of bankruptcy of RRT;  transactions between RRT and the Company, subject to certain limited exceptions;  any equity granted or equity incentive plan adopted by RRLP or any of its subsidiaries; and  certain matters relating to the Credit Enhancement Note (as defined below) between the Company and RRLP (other than ordinary course borrowings or repayments thereunder). Under a Discretionary Demand Promissory Note (the “Credit Enhancement Note”), the Company may provide periodic cash advances to RRLP. The Credit Enhancement Note provides for an interest rate equal to the London Inter-Bank Offered Rate plus fifty ( 50 ) basis points above the applicable interest rate under the Company’s unsecured revolving credit facility. The maximum aggregate principal amount of advances at any one time outstanding under the Credit Enhancement Note is limited to $ 50 million, an increase of $ 25 million from the prior transaction. RRT and RRLP also have agreed, as was the case under the Original Investment Agreement, to register the Preferred Units under certain circumstances in the future in the event RRT or RRLP becomes a publicly traded company. During the period commencing on June 28, 2019 and ending on March 1, 2023 (the “Lockout Period”), Rockpoint’s interest in the Preferred Units cannot be redeemed or repurchased, except in connection with (a) a sale of all or substantially all of RRLP or a sale of a majority of the then-outstanding interests in RRLP, in each case, which sale is not approved by Rockpoint, or (b) a spin-out or initial public offering of common stock of RRT, or distributions of RRT equity interests by the Company or its affiliates to shareholders or their respective parent interestholders (an acquisition pursuant clauses (a) or (b) above, an “Early Purchase”). RRT has the right to acquire Rockpoint’s interest in the Preferred Units in connection with an Early Purchase for a purchase price generally equal to (i) the amount that Rockpoint would receive upon the sale of the assets of RRLP for fair market value and a distribution of the net sale proceeds in accordance with (A) the capital event distribution priorities discussed above (in the case of certain Rockpoint Preferred Holders) and (B) the distribution priorities applicable in the case of a liquidation of RRLP (in the case of the other Rockpoint Preferred Holder), plus (ii) a make whole premium (such purchase price, the “Purchase Payment”). The make whole premium is an amount equal to (i) $ 173.5 million until December 28, 2020, or $ 198.5 million thereafter, less distributions theretofore made to Rockpoint with respect to its Preferred Base Return or any deficiency therein, plus (ii) $ 1.5 million less certain other distributions theretofore made to Rockpoint. The fair market value of RRLP’s assets is determined by a third party appraisal of the net asset value (“NAV”) of RRLP and the fair market value of RRLP’s assets, to be completed within ninety (90) calendar days of March 1, 2023 and annually thereafter. After the Lockout Period, either RRT may acquire from Rockpoint, or Rockpoint may sell to RRT, all, but not less than all, of Rockpoint’s interest in the Preferred Units (each, a “Put/Call Event”) for a purchase price equal to the Purchase Payment (determined without regard to the make whole premium and any related tax allocations). An acquisition of Rockpoint’s interest in the Preferred Units pursuant to a Put/Call Event is generally required to be structured as a purchase of the common equity in the applicable Rockpoint entities holding direct or indirect interests in the Preferred Units. Subject to certain exceptions, Rockpoint also has a right of first offer and a participation right with respect to other common equity interests of RRLP or any subsidiary of RRLP that may be offered for sale by RRLP or its subsidiaries from time to time. Upon a Put/Call Event, other than in the event of a sale of RRLP, Rockpoint may elect to convert all, but not less than all, of its Preferred Units to Common Units in RRLP. As such, the Preferred Units contain a substantive redemption feature that is outside of the Company’s control and accordingly, pursuant to ASC 480-1—S99-3A, the Preferred Units are classified in mezzanine equity measured based on the estimated future redemption value as of December 31, 2020. The Company determines the redemption value of these interests by hypothetically liquidating the estimated NAV of the RRT real estate portfolio including debt principal through the applicable waterfall provisions of the new transaction with Rockpoint. The estimation of NAV includes unobservable inputs that consider assumptions of market participants in pricing the underlying assets of RRLP. For properties under development, the Company applies a discount rate to the estimated future cash flows allocable to the Company during the period under construction and then applies a direct capitalization method to the estimated stabilized cash flows. For operating properties, the direct capitalization method is used by applying a capitalization rate to the projected net operating income. For developable land holdings, an estimated per-unit market value assumption is considered based on development rights for the land. Estimated future cash flows used in such analyses are based on the Company’s business plan for each respective property including capital expenditures, management’s views of market and economic conditions, and considers items such as current and future rental rates, occupancies and market transactions for comparable properties. The estimated future redemption value of the Preferred Units is approximately $ 476 million as of December 31, 2020. Preferred Units On February 3, 2017, the Operating Partnership issued 42,800 shares of a new class of 3.5 percent Series A Preferred Limited Partnership Units of the Operating Partnership (the “Series A Units”). The Series A Units were issued to the Company’s partners in the Plaza VIII & IX Associates L.L.C. joint venture that owns a development site adjacent to the Company’s Harborside property in Jersey City, New Jersey as non-cash consideration for their approximate 37.5 percent interest in the joint venture. Each Series A Unit has a stated value of $ 1,000 , pays dividends quarterly at an annual rate of 3.5 percent (subject to increase under certain circumstances), is convertible into 28.15 common units of limited partnership interests of the Operating Partnership beginning generally five years from the date of issuance, or an aggregate of up to 1,204,820 common units. The conversion rate was based on a value of $ 35.52 per common unit. The Series A Units have a liquidation and dividend preference senior to the common units and include customary anti-dilution protections for stock splits and similar events. The Series A Units are redeemable for cash at their stated value beginning five years from the date of issuance at the option of the holder. On February 28, 2017, the Operating Partnership authorized the issuance of 9,213 shares of a new class of 3.5 percent Series A-1 Preferred Limited Partnership Units of the Operating Partnership (the “Series A-1 Units”). 9,122 Series A-1 Units were issued on February 28, 2017 and an additional 91 Series A-1 Units were issued in April 2017 pursuant to acquiring additional interests in a joint venture that owns Monaco Towers in Jersey City, New Jersey. The Series A-1 Units were issued as non-cash consideration for the partner’s approximate 13.8 percent ownership interest in the joint venture. Each Series A-1 Unit has a stated value of $ 1,000 (the “Stated Value”), pays dividends quarterly at an annual rate equal to the greater of (x) 3.5 percent, or (y) the then-effective annual dividend yield on the General Partner’s common stock, and is convertible into 27.936 common units of limited partnership interests of the Operating Partnership beginning generally five years from the date of issuance, or an aggregate of up to 257,375 Common Units. The conversion rate was based on a value of $ 35.80 per common unit. The Series A-1 Units have a liquidation and dividend preference senior to the Common Units and include customary anti-dilution protections for stock splits and similar events. The Series A-1 Units are redeemable for cash at their stated value beginning five years from the date of issuance at the option of the holder. The Series A-1 Units are pari passu with the 42,800 3.5 % Series A Units issued on February 3, 2017. The following tables set forth the changes in Redeemable noncontrolling interests for the year ended December 31, 2020 (dollars in thousands) : Series A and Total A-1 Preferred Rockpoint Redeemable Units Interests Noncontrolling In MCRLP in RRT Interests Balance January 1, 2020 $ 52,324 $ 451,058 $ 503,382 Redeemable Noncontrolling Interests Issued - - - Net 52,324 451,058 503,382 Income Attributed to Noncontrolling Interests 1,820 24,063 25,883 Distributions ( 1,820 ) ( 24,063 ) ( 25,883 ) Other Distributions - ( 3,153 ) ( 3,153 ) Redemption Value Adjustment - 13,068 13,068 Redeemable noncontrolling interests as of December 31, 2020 $ 52,324 $ 460,973 $ 513,297 Series A and Total A-1 Preferred Rockpoint Redeemable Units Interests Noncontrolling In MCRLP in RRT Interests Balance January 1, 2019 $ 52,324 $ 278,135 $ 330,459 Redeemable Noncontrolling Interests Issued (net of new issuance costs of $ 1.5 million) - 143,450 143,450 Net 52,324 421,585 473,909 Income Attributed to Noncontrolling Interests 1,820 20,795 22,615 Distributions ( 1,820 ) ( 20,795 ) ( 22,615 ) Redemption Value Adjustment (including value adjustment attributable to Add On Investment Agreement) - 29,473 29,473 Redeemable noncontrolling interests as of December 31, 2019 $ 52,324 $ 451,058 $ 503,382

Mack-Cali Realty Corporation St

Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital	12 Months Ended
	Dec. 31, 2020
Stockholders Equity [Line Items]
Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital	16. MACK-CALI REALTY CORPORATION STOCKHOLDERS’ EQUITY AND MACK-CALI REALTY, L.P.’S PARTNERS’ CAPITAL To maintain its qualification as a REIT, not more than 50 percent in value of the outstanding shares of the General Partner may be owned, directly or indirectly, by five or fewer individuals at any time during the last half of any taxable year of the General Partner, other than its initial taxable year (defined to include certain entities), applying certain constructive ownership rules. To help ensure that the General Partner will not fail this test, the General Partner’s Charter provides, among other things, certain restrictions on the transfer of common stock to prevent further concentration of stock ownership. Moreover, to evidence compliance with these requirements, the General Partner must maintain records that disclose the actual ownership of its outstanding common stock and demands written statements each year from the holders of record of designated percentages of its common stock requesting the disclosure of the beneficial owners of such common stock. Partners’ Capital in the accompanying consolidated financial statements relates to (a) General Partners’ capital consisting of common units in the Operating Partnership held by the General Partner, and (b) Limited Partners’ capital consisting of common units and LTIP units held by the limited partners. See Note 17: Noncontrolling Interests in Subsidiaries. Any transactions resulting in the issuance of additional common and preferred stock of the General Partner result in a corresponding issuance by the Operating Partnership of an equivalent amount of common and preferred units to the General Partner. SHARE/UNIT REPURCHASE PROGRAM In September 2012 , the Board of Directors of the General Partner renewed and authorized an increase to the General Partner’s repurchase program (“Repurchase Program”). The General Partner has authorization to repurchase up to $ 150 million of its outstanding common stock under the renewed Repurchase Program, which it may repurchase from time to time in open market transactions at prevailing prices or through privately negotiated transactions. As of December 31, 2020, the General Partner has repurchased and retired 394,625 shares of its outstanding common stock for an aggregate cost of approximately $ 11 million (all of which occurred in the year ended December 31, 2012), with a remaining authorization under the Repurchase Program of $ 139 million. Concurrent with these repurchases, the General Partner sold to the Operating Partnership common units for approximately $ 11 million. DIVIDEND REINVESTMENT AND STOCK PURCHASE PLAN The General Partner has a Dividend Reinvestment and Stock Purchase Plan (the “DRIP”) which commenced in March 1999 under which approximately 5.5 million shares of the General Partner’s common stock have been reserved for future issuance. The DRIP provides for automatic reinvestment of all or a portion of a participant’s dividends from the General Partner’s shares of common stock. The DRIP also permits participants to make optional cash investments up to $ 5,000 a month without restriction and, if the Company waives this limit, for additional amounts subject to certain restrictions and other conditions set forth in the DRIP prospectus filed as part of the Company’s effective registration statement on Form S-3 filed with the SEC for the approximately 5.5 million shares of the General Partner’s common stock reserved for issuance under the DRIP. STOCK OPTION PLANS In May 2013, the General Partner established the 2013 Incentive Stock Plan (the “2013 Plan”) under which a total of 4,600,000 shares have been reserved for issuance. On June 5, 2015, in connection with employment agreements entered into with each of Messrs. Rudin and DeMarco, former chief executive officers (together, the “Executive Employment Agreements”), the Company granted options to purchase a total of 800,000 shares of the General Partner’s common stock, exercisable for a period of ten years with an exercise price equal to the closing price of the General Partner’s common stock on the grant date of $ 17.31 per share, with 400,000 of such options vesting in three equal annual installments commencing on the first anniversary of the grant date (“Time Vesting Options”) and fully vesting on June 5, 2018, and 400,000 of such options vesting if the General Partner’s common stock traded at or above $ 25.00 per share for 30 consecutive trading days while the executive is employed (“Price Vesting Options”), or on or before June 30, 2019, subject to certain conditions. The Price Vesting Options vested on July 5, 2016 on account of the price vesting condition being achieved. Pursuant to the Letter Agreement in connection with Ms. Gilmartin’s appointment as the Company’s interim Chief Executive Officer, the Company granted to MAG Partners fully vested stock options to purchase up to 230,000 shares of common stock with an exercise price of $ 14.39 per share, and up to 100,000 shares of common stock with an exercise price of $ 20.00 per share, pursuant to the Option Agreement. However, the options, and any shares received upon exercise, will terminate and be forfeited if the Board of Directors ends the Term for “cause” or MAG Partners terminates its arrangement with the Company (including a resignation by Ms. Gilmartin of her appointment as interim Chief Executive Officer, but excluding a termination because of a material breach of the arrangement by the Company or because Ms. Gilmartin has been appointed as the permanent Chief Executive Officer of the Company) before six months have elapsed, or if MAG Partners fails to comply with certain covenants in the Letter Agreement. 157,505 of the options have been granted subject to shareholder approval at the Company’s 2021 Annual Meeting of Stockholders; however, if a “change in control” transaction occurs before the date of such 2021 Annual Meeting, then such options would instead be canceled and cashed out upon such transaction for a value equal to their “spread value,” if any. See Note 13-Commitments and Contingencies. Information regarding the Company’s stock option plans is summarized below: Weighted Aggregate Average Intrinsic Shares Exercise Value Under Options Price $(000’s) Outstanding at January 1, 2018 ($ 17.31 ) 800,000 $ 17.31 $ 3,400 Granted, Lapsed or Cancelled - - Outstanding at December 31, 2018 ($ 17.31 ) 800,000 $ 17.31 1,824 Granted, Lapsed or Cancelled - - Outstanding at December 31, 2019 ($ 17.31 ) 800,000 $ 17.31 4,656 Granted 172,495 14.39 Outstanding at December 31, 2020 ($ 14.39 - $ 17.31 ) 972,495 $ 16.79 $ - Options exercisable at December 31, 2020 972,495 Available for grant at December 31, 2020 717,155 The weighted average fair value of options granted during the year ended December 31, 2020 was $ 2.95 per option. The fair value of each option grant is estimated on the date of grant using the Black-Scholes model. The following weighted average assumptions are included in the Company’s fair value calculations of stock options granted during the year ended December 31, 2020: Stock Options Expected life (in years) 5.3 Risk-free interest rate 0.41 % Volatility 31.0 % Dividend yield 2.7 % There were no stock options exercised under any stock option plans for the years ended December 31, 2020, 2019 and 2018. The Company has a policy of issuing new shares to satisfy stock option exercises. As of December 31, 2020 and 2019, the stock options outstanding had a weighted average remaining contractual life of approximately 3.6 years and 5.4 years, respectively. The Company recognized stock options expense of 446,000 , zero and $ 193,000 for the years ended December 31, 2020, 2019 and 2018, respectively. AO LTIP UNITS (Appreciation-Only LTIP Units) Pursuant to the terms of the DeMarco employment agreement, the Company entered into an AO Long-Term Incentive Plan Award Agreement (the “AO LTIP Award Agreement”) with Mr. DeMarco on March 13, 2019 that provided for the grant to Mr. DeMarco of 625,000 AO LTIP Units. AO LTIP Units are a class of partnership interests in the Operating Partnership that are intended to qualify as “profits interests” for federal income tax purposes and generally only allow the recipient to realize value to the extent the fair market value of a share of Common Stock exceeds the threshold level set at the time the AO LTIP Units are granted, subject to any vesting conditions applicable to the award. The threshold level was fixed at $ 21.46 in the AO LTIP Award Agreement, the closing price of the Common Stock as reported on the New York Stock Exchange (the “NYSE”) on the date of grant. The value of vested AO LTIP Units is realized through conversion of the AO LTIP Units into common units of limited partnership interests of the Operating Partnership (the “Common Units”). The number of Common Units into which vested AO LTIP Units may be converted is determined based on the quotient of (i) the excess of the fair market value of the Common Stock on the conversion date over the threshold level designated at the time the AO LTIP Unit was granted (i.e., $ 21.46 ), divided by (ii) the fair market value of the Common Stock on the conversion date. AO LTIP Units, once vested, have a finite term during which they may be converted into Common Units, within ten years from the grant date of the AO LTIP Units or they are forfeited. In addition, the AO LTIP Units issued to Mr. DeMarco are subject to the following vesting conditions: (i) 250,000 of the AO LTIP Units shall vest and become exercisable on the earliest date on which the closing price of the Common Stock, as reported on the NYSE, or if the Common Stock is not then traded on the NYSE, then the closing price of the Common Stock on any other securities exchange on which the Common Stock is traded or quoted (the “Securities Market”), has been equal to or greater than $ 25.00 per share for at least 30 consecutive trading days, provided that such date occurs prior to March 13, 2023 (the “Outside Date”); (ii) an additional 250,000 of the AO LTIP Units shall vest and become exercisable on the earliest date on which the closing price of the Common Stock, as reported on the NYSE, or if the Common Stock is not then traded on the NYSE, then the closing price of the Common Stock on the Securities Market, has been equal to or greater than $ 28.00 per share for at least 30 consecutive trading days, provided that such date occurs prior to the Outside Date; and (iii) an additional 125,000 of the AO LTIP Units shall vest and become exercisable on the earliest date on which the closing price of the Common Stock, as reported on the NYSE, or if the Common Stock is not then traded on the NYSE, then the closing price of the Common Stock on the Securities Market, has been equal to or greater than $ 31.00 per share for at least 30 consecutive trading days, provided that such date occurs prior to the Outside Date. Mr. DeMarco will generally receive special income allocations in respect of an AO LTIP Unit equal to 10 percent (or such other percentage specified in the applicable award agreement) of the income allocated in respect of a Common Unit. Upon conversion of AO LTIP Units to Common Units, Mr. DeMarco will be entitled to receive in respect of each such AO LTIP Unit, on a per unit basis, a special cash distribution equal to 10 % (or such other percentage specified in the applicable award agreement) of the distributions received by a holder of an equivalent number of Common Units during the period from the grant date of the AO LTIP Units through the date of conversion. The Company has reserved shares of common stock under the 2013 Plan for issuance upon vesting and conversion of the AO LTIP Units in accordance with their terms and conditions. The weighted average fair value of the AO LTIP Units granted during the year ended December 31, 2019 was $ 3.98 per AO LTIP Unit. The fair value of each AO LTIP Unit grant is estimated on the date of grant using the Monte Carlo method. The following weighted average assumptions were included in the Company’s fair value calculations of AO LTIP Units granted during the year ended December 31, 2019: AO LTIP Units Expected life (in years) 5.5 - 6.0 Risk-free interest rate 2.6 % Volatility 29.0 % Dividend yield 3.5 % As of December 31, 2020, the Company had $ 1.4 million of total unrecognized compensation cost related to unvested AO LTIP Units granted under the Company’s stock compensation plans. That cost is expected to be recognized over a remaining weighted average period of 2.2 years. The Company recognized AO LTIP unit expense of $ 622,000 , $ 498,000 and zero for the years ended December 31, 2020, 2019 and 2018, respectively. RESTRICTED STOCK AWARDS The Company has issued stock awards (“Restricted Stock Awards”) to officers, certain other employees and non-employee members of the Board of Directors of the General Partner, which allow the holders to each receive a certain amount of shares of the General Partner’s common stock generally over a one-year to seven-year vesting period, of which 52,974 unvested shares were legally outstanding at December 31, 2020. Vesting of the Restricted Stock Awards issued is based on time and service. On June 5, 2015, in connection with the new executive employment agreements signed at that time, the Company granted a total of 37,550.54 Restricted Stock Awards, which were valued in accordance with ASC 718 – Stock Compensation, at their fair value. These awards vested equally over a three year period on each annual anniversary date of the grant date. All currently outstanding and unvested Restricted Stock Awards provided to the officers, certain other employees, and members of the Board of Directors of the General Partner were issued under the 2013 Plan. Information regarding the Restricted Stock Awards grant activity is summarized below: Weighted-Average Grant – Date Shares Fair Value Outstanding at January 1, 2018 108,318 $ 25.49 Granted 40,185 20.16 Vested ( 72,502 ) 25.33 Forfeited ( 8,712 ) 25.83 Outstanding at December 31, 2018 67,289 $ 22.43 Granted 42,690 21.08 Vested ( 65,353 ) 22.34 Forfeited ( 1,936 ) 25.83 Outstanding at December 31, 2019 42,690 $ 21.08 Granted 52,974 15.29 Vested ( 42,690 ) 21.08 Forfeited - - Outstanding at December 31, 2020 52,974 $ 15.29 As of December 31, 2020, the Company had $ 0.4 million of total unrecognized compensation cost related to unvested Restricted Stock Awards granted under the Company’s stock compensation plans. That cost is expected to be recognized over a weighted average period of 0.5 years. LONG-TERM INCENTIVE PLAN AWARDS On March 8, 2016, the Company granted Long-Term Incentive Plan (“LTIP”) awards to senior management of the Company, including the General Partner’s executive officers (the “2016 LTIP Awards”). All of the 2016 LTIP Awards were in the form of units in the Operating Partnership (“LTIP Units”) and constitute awards under the 2013 Plan. For Messrs. Rudin, DeMarco and Tycher, approximately 25 percent of the target 2016 LTIP Award was in the form of a time-based award that vested after three year s on March 8, 2019 (the “2016 TBV LTIP Units”), and the remaining approximately 75 percent of the target 2016 LTIP Award was in the form of a performance-based award under a new Outperformance Plan (the “2016 OPP”) adopted by the General Partner’s Board of Directors consisting of a multi-year, performance-based equity compensation plan and related forms of award agreement (the “2016 PBV LTIP Units”). For all other executive officers, approximately 40 percent of the target 2016 LTIP Award was in the form of 2016 TBV LTIP Units and the remaining approximately 60 percent of the target 2016 LTIP Award was in the form of 2016 PBV LTIP Units. The 2016 TBV LTIP Units vested on March 8, 2019. The 2016 OPP was designed to align the interests of senior management to relative and absolute performance of the Company over a three year performance period from March 8, 2016 through March 7, 2019. Participants in the 2016 OPP would only earn the full awards if, over the three year performance period, the Company achieves a 50 percent absolute total stockholder return (“TSR”) and if the Company is in the 75th percentile of performance versus the NAREIT Office Index. As the targets for vesting were not achieved, the 2016 PBV LTIP Units did not vest and were forfeited. On April 4, 2017, the Company granted LTIP awards to senior management of the Company, including the General Partner’s executive officers (the “2017 LTIP Awards”). All of the 2017 LTIP Awards were in the form of LTIP Units and constitute awards under the 2013 Plan. For Messrs. DeMarco, Tycher and Rudin, approximately twenty-five percent ( 25 %) of the 2017 LTIP Award was in the form of a time-based award that vested after three year s on April 4, 2020 (the “2017 TBV LTIP Units”), and the remaining approximately seventy-five percent ( 75 %) of the 2017 LTIP Award was in the form of a performance-based award under the Company’s Outperformance Plan (the “2017 OPP”) adopted by the General Partner’s Board of Directors, consisting of a multi-year, performance-based equity compensation plan and related forms of award agreement (the “2017 PBV LTIP Units”). For all other executive officers, approximately forty percent ( 40 %) of the 2017 LTIP Award was in the form of 2017 TBV LTIP Units and the remaining approximately sixty percent ( 60 %) of the 2017 LTIP Award was in the form of 2017 PBV LTIP Units. The 2017 TBV LTIP Units vested on April 4, 2020. The 2017 OPP was designed to align the interests of senior management to relative and absolute performance of the Company over a three-year performance period from April 4, 2017 through April 3, 2020. Participants in the 2017 OPP will only earn the full awards if, over the three year performance period, the Company achieves a thirty-six percent ( 36 %) absolute TSR and if the Company is in the 75th percentile of performance as compared to the NAREIT office index. As the targets for vesting were not achieved, the 2017 PBV LTIP Units did not vest and were forfeited. On April 20, 2018, the Company granted LTIP awards to senior management of the Company, including the General Partner’s executive officers (the “2018 LTIP Awards”). All of the 2018 LTIP Awards were in the form of LTIP Units and constitute awards under the 2013 Plan. For Messrs. DeMarco and Tycher, approximately twenty-five percent ( 25 %) of the grant date fair value of the 2018 LTIP Award was in the form of a time-based award that vests after three year s on April 20, 2021 (the “2018 TBV LTIP Units”), and the remaining approximately seventy-five percent ( 75 %) of the grant date fair value of the 2018 LTIP Award was in the form of a performance-based award under the Company’s Outperformance Plan (the “2018 OPP”) adopted by the General Partner’s Board of Directors, consisting of a multi-year, performance-based equity compensation plan and related forms of award agreement (the “2018 PBV LTIP Units”). For all other executive officers, approximately fifty percent ( 50 %) of the grant date fair value of the 2018 LTIP Award was in the form of 2018 TBV LTIP Units and the remaining approximately fifty percent ( 50 %) of the grant date fair value of the 2018 LTIP Award was in the form of 2018 PBV LTIP Units. The 2018 OPP was designed to align the interests of senior management to relative and absolute performance of the Company over a three year performance period from April 20, 2018 through April 19, 2021. Participants in the 2018 OPP will only earn the full awards if, over the three-year performance period, the Company achieves a thirty-six percent ( 36 %) absolute TSR and if the Company’s TSR is in the 75th percentile of performance as compared to the office REITs in the NAREIT index. On March 22, 2019, the Company granted LTIP awards to senior management of the Company, including the General Partner’s executive officers (the “2019 LTIP Awards”). All of the 2019 LTIP Awards were in the form of LTIP Units and constitute awards under the 2013 Plan. For Mr. DeMarco, approximately 25 percent of the target 2019 LTIP Awards were in the form of time-based LTIP Units that vest after three years on March 22, 2022 (the “2019 TBV LTIP Units”), and the remaining approximately 75 percent of the grant date fair value of his 2019 LTIP Award will be in the form of performance-based LTIP Units under the Company’s Outperformance Plan (the “2019 OPP”) adopted by the General Partner’s Board of Directors, consisting of a multi-year, performance-based equity compensation plan and related forms of award agreement (the “2019 PBV LTIP Units”). For Messrs. Tycher, Smetana, Wagner, Cardoso and Hilton, fifty percent ( 50 %) of the grant date fair value of their respective 2019 LTIP Awards is in the form of 2019 TBV LTIP Units and the remaining fifty percent ( 50 %) of the grant date fair value of their respective 2019 LTIP Awards is in the form of 2019 PBV LTIP Units. Mr. DeBari, who was promoted to Chief Accounting Officer on March 13, 2019, received 100 percent of his 2019 LTIP Award in the form of 2019 TBV LTIP Units. The 2019 OPP was designed to align the interests of senior management to relative and absolute performance of the Company over a three year performance period from March 22, 2019 through March 21, 2022. Participants of performance-based awards in the 2019 OPP will only earn the full awards if, over the three year performance period, the Company achieves a thirty-six percent ( 36 %) absolute total stockholder return (“TSR”) and if the Company’s TSR is in the 75th percentile of performance as compared to the office REITs in the NAREIT index. On March 24, 2020, the Company granted LTIP awards to senior management of the Company, including the General Partner’s executive officers (the “2020 LTIP Awards”). All of the 2020 LTIP Awards were in the form of LTIP Units and constitute awards under the 2013 Plan. All of the target 2020 LTIP Awards were in the form of performance-based LTIP Units under the Company’s Outperformance Plan (the “2020 OPP”) adopted by the General Partner’s Board of Directors, consisting of a multi-year, performance-based equity compensation plan and related forms of award agreement (the “2020 PBV LTIP Units”). The 2020 OPP was designed to align the interests of senior management to relative and absolute performance of the Company over a three year performance period from March 24, 2020 through March 23, 2023. Participants of performance-based awards in the 2020 OPP will only earn the full awards if, over the three year performance period, the Company achieves a thirty six percent ( 36 %) absolute total stockholder return (“TSR”) and if the Company’s TSR is in the 75th percentile of performance as compared to the REITs in the NAREIT index. LTIP Units will remain subject to forfeiture depending on the extent that the 2018 LTIP Awards, 2019 LTIP Awards and 2020 LTIP Awards vest. The number of LTIP Units to be issued initially to recipients of the 2018 PBV LTIP Awards, 2019 PBV LTIP Awards and 2020 PBV LTIP Awards is the maximum number of LTIP Units that may be earned under the awards. The number of LTIP Units that actually vest for each award recipient will be determined at the end of the performance measurement period. TSR for the Company and for the Index over the three year measurement period and other circumstances will determine how many LTIP Units vest for each recipient; if they are fewer than the number issued initially, the balance will be forfeited as of the performance measurement date. On January 4, 2021, in accordance with Mr. Cardoso’s employment agreement, the Company granted LTIP awards (the “J Series 2021 LTIP Awards”). All of the J Series 2021 LTIP Awards were in the form of LTIP Units and constitute awards under the 2013 Plan. All of the target 2020 LTIP Awards were in the form of performance-based LTIP Units under the Company’s Outperformance Plan (the “J Series 2021 OPP”) adopted by the General Partner’s Board of Directors, consisting of a multi-year, performance-based equity compensation plan and related forms of award agreement. The J Series 2021 OPP was subject to the achievement of certain sales performance milestones with respect to commercial asset dispositions by the Company over a performance period from August 1, 2020 through December 31, 2022. These sales milestones will be based on the aggregate gross sales prices of the assets, provided that the asset will only be included in the milestone if it is sold for not less than 85 % of its estimated net asset value, as defined in the agreement. Prior to vesting, recipients of LTIP Units will be entitled to receive per unit distributions equal to one-tenth ( 10 percent) of the regular quarterly distributions payable on a Common Unit, but will not be entitled to receive any special distributions. Distributions with respect to the other nine-tenths ( 90 percent) of regular quarterly distributions payable on a common unit will accrue but shall only become payable upon vesting of the LTIP Unit. After vesting of the 2018 TBV LTIP Units, 2019 TBV LTIP Units and 2020 TBV LTIP Units or the end of the measurement period for the 2018 PBV LTIP Units, 2019 PBV LTIP Units and 2020 PBV LTIP Units, the number of LTIP Units, both vested and unvested, will be entitled to receive distributions in an amount per unit equal to distributions, both regular and special, payable on a Common Unit. As a result of targets not being achieved or management and other personnel changes during the year ended December 31, 2020, the employees forfeited and cancelled, 369,924 2017 LTIP Awards, 102,639 2018 LTIP Awards, 175,570 2019 LTIP Awards and 567,254 2020 LTIP Awards. As of December 31, 2020, a total of 3,718 2016 PBV LTIP Units, 68,205 2016 TBV LTIP Units, 10,264 2017 PBV LTIP Units, 70,772 2017 TBV LTIP Units, 542,651 2018 PBV LTIP Units, 177,179 2018 TBV LTIP Units, 249,058 2019 PBV LTIP Units and 140,995 2019 TBV LTIP Units, and 720,314 2020 PBV LTIP Units, net of LTIP Units forfeited and cancelled, were outstanding. The LTIP Units were valued in accordance with ASC 718 – Stock Compensation, at their fair value. The Company has reserved shares of common stock under the 2013 Plan for issuance upon vesting and conversion of the LTIP Units in accordance with their terms and conditions. As of December 31, 2020, the Company had $ 8.0 million of total unrecognized compensation cost related to unvested LTIP awards granted under the Company’s stock compensation plans. That cost is expected to be recognized over a weighted average period of 2.3 years. DEFERRED STOCK COMPENSATION PLAN FOR DIRECTORS The Amended and Restated Deferred Compensation Plan for Directors, which commenced January 1, 1999, allows non - employee directors of the Company to elect to defer up to 100 percent of their annual retainer fee into deferred stock units. The deferred stock units are convertible into an equal number of shares of common stock upon the directors’ termination of service from the Board of Directors or a change in control of the Company, as defined in the plan. Pursuant to the termination of service of five directors from the Board of Directors on June 12, 2019, the Company converted 193,949 deferred stock units into shares of common stock. Pursuant to the termination of service of two directors from the Board of Directors on June 12, 2020, the Company converted 61,277 deferred stock units into shares of common stock. Deferred stock units are credited to each director quarterly using the closing price of the Company’s common stock on the applicable dividend record date for the respective quarter. Each participating director’s account is also credited for an equivalent amount of deferred stock units based on the dividend rate for each quarter. During the years ended December 31, 2020, 2019 and 2018, 22,086 , 14,337 and 26,620 deferred stock units were earned, respectively. As of December 31, 2020 and 2019, there were 17,854 and 59,899 deferred stock units outstanding, respectively. EARNINGS PER SHARE/UNIT Basic EPS or EPU excludes dilution and is computed by dividing net income available to common shareholders or unitholders by the weighted average number of shares or units outstanding for the period. Diluted EPS or EPU reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock. In the calculation of basic and diluted EPS and EPU, a redemption value adjustment of redeemable noncontrolling interests attributable to common shareholders or unitholders is included in the calculation to arrive at the numerator of net income (loss) available to common shareholders or unitholders. The following information presents the Company’s results for the years ended December 31, 2020, 2019 and 2018 in accordance with ASC 260, Earnings Per Share (dollars in thousands, except per share amounts) : Mack-Cali Realty Corporation: Year Ended December 31, Computation of Basic EPS 2020 2019 2018 Income (loss) from continuing operations $ ( 115,523 ) $ 252,820 $ 82,824 Add (deduct): Noncontrolling interests in consolidated joint ventures 2,695 3,904 1,216 Add (deduct): Noncontrolling interests in Operating Partnership 13,279 ( 23,720 ) ( 7,127 ) Add (deduct): Redeemable noncontrolling interests ( 25,883 ) ( 22,615 ) ( 13,979 ) Add (deduct): Redemption value adjustment of redeemable noncontrolling interests attributable to common shareholders ( 11,814 ) ( 25,885 ) ( 11,425 ) Income (loss) from continuing operations available to common shareholders ( 137,246 ) 184,504 51,509 Income (loss) from discontinued operations available to common shareholders 74,045 ( 98,528 ) 21,177 Net income (loss) available to common shareholders for basic earnings per share $ ( 63,201 ) $ 85,976 $ 72,686 Weighted average common shares 90,648 90,557 90,388 Basic EPS : Income (loss) from continuing operations available to common shareholders $ ( 1.51 ) $ 2.04 $ 0.57 Income (loss) from discontinued operations available to common shareholders 0.81 ( 1.09 ) 0.23 Net income (loss) available to common shareholders $ ( 0.70 ) $ 0.95 $ 0.80 Year Ended December 31, Computation of Diluted EPS 2020 2019 2018 Net income (loss) from continuing operations available to common shareholders $ ( 137,246 ) $ 184,504 $ 51,509 Add (deduct): Noncontrolling interests in Operating Partnership ( 13,279 ) 23,720 7,127 Add (deduct): Redemption value adjustment of redeemable noncontrolling interests attributable to the Operating Partnership unitholders ( 1,254 ) ( 2,855 ) ( 1,296 ) Income (loss) from continuing operations for diluted earnings per share ( 151,779 ) 205,369 57,340 Income (loss) from discontinued operations for diluted earnings per share 81,925 ( 108,984 ) 23,577 Net income (loss) available for diluted earnings per share $ ( 69,854 ) $ 96,385 $ 80,917 Weighted average common shares 100,260 100,689 100,724 Diluted EPS : Income (loss) from continuing operations available to common shareholders $ ( 1.51 ) $ 2.04 $ 0.57 Income (loss) from discontinued operations available to common shareholders 0.81 ( 1.09 ) 0.23 Net income (loss) available to common shareholders $ ( 0.70 ) $ 0.95 $ 0.80 The following schedule reconciles the weighted average shares used in the basic EPS calculation to the shares used in the diluted EPS calculation (in thousands): Year Ended December 31, 2020 2019 2018 Basic EPS shares 90,648 90,557 90,388 Add: Operating Partnership – common and vested LTIP units 9,612 9,963 10,246 Restricted Stock Awards - - - Stock Options - 169 90 Diluted EPS Shares 100,260 100,689 100,724 Contingently issuable shares under Restricted Stock Awards were excluded from the denominator during all periods presented as such securities were anti-dilutive during the periods. Shares issuable under all outstanding stock options were excluded from the denominator in the year ended December 31, 2020 as such securities were anti-dilutive during the period. Also not included in the computations of diluted EPS were the unvested LTIP Units and unvested AO LTIP Units as such securities were anti-dilutive during all periods presented. Unvested LTIP Units outstanding as of December 31, 2020, 2019 and 2018 were 1,722,929 , 1,826,331 and 1,707,106 , respectively. Unvested restricted stock outstanding as of December 31, 2020, 2019 and 2018 were 52,974 , 42,690 and 67,289 shares, respectively. Unvested AO LTIP Units outstanding as of each of December 31, 2020 and 2019 were 625,000 . Dividends declared per common share for the years ended December 31, 2020, 2019 and 2018 was $ 0.40 , $ 0.80 a
Mack-Cali Realty LP [Member]
Stockholders Equity [Line Items]
Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital	16. MACK-CALI REALTY CORPORATION STOCKHOLDERS’ EQUITY AND MACK-CALI REALTY, L.P.’S PARTNERS’ CAPITAL To maintain its qualification as a REIT, not more than 50 percent in value of the outstanding shares of the General Partner may be owned, directly or indirectly, by five or fewer individuals at any time during the last half of any taxable year of the General Partner, other than its initial taxable year (defined to include certain entities), applying certain constructive ownership rules. To help ensure that the General Partner will not fail this test, the General Partner’s Charter provides, among other things, certain restrictions on the transfer of common stock to prevent further concentration of stock ownership. Moreover, to evidence compliance with these requirements, the General Partner must maintain records that disclose the actual ownership of its outstanding common stock and demands written statements each year from the holders of record of designated percentages of its common stock requesting the disclosure of the beneficial owners of such common stock. Partners’ Capital in the accompanying consolidated financial statements relates to (a) General Partners’ capital consisting of common units in the Operating Partnership held by the General Partner, and (b) Limited Partners’ capital consisting of common units and LTIP units held by the limited partners. See Note 17: Noncontrolling Interests in Subsidiaries. Any transactions resulting in the issuance of additional common and preferred stock of the General Partner result in a corresponding issuance by the Operating Partnership of an equivalent amount of common and preferred units to the General Partner. SHARE/UNIT REPURCHASE PROGRAM In September 2012 , the Board of Directors of the General Partner renewed and authorized an increase to the General Partner’s repurchase program (“Repurchase Program”). The General Partner has authorization to repurchase up to $ 150 million of its outstanding common stock under the renewed Repurchase Program, which it may repurchase from time to time in open market transactions at prevailing prices or through privately negotiated transactions. As of December 31, 2020, the General Partner has repurchased and retired 394,625 shares of its outstanding common stock for an aggregate cost of approximately $ 11 million (all of which occurred in the year ended December 31, 2012), with a remaining authorization under the Repurchase Program of $ 139 million. Concurrent with these repurchases, the General Partner sold to the Operating Partnership common units for approximately $ 11 million. DIVIDEND REINVESTMENT AND STOCK PURCHASE PLAN The General Partner has a Dividend Reinvestment and Stock Purchase Plan (the “DRIP”) which commenced in March 1999 under which approximately 5.5 million shares of the General Partner’s common stock have been reserved for future issuance. The DRIP provides for automatic reinvestment of all or a portion of a participant’s dividends from the General Partner’s shares of common stock. The DRIP also permits participants to make optional cash investments up to $ 5,000 a month without restriction and, if the Company waives this limit, for additional amounts subject to certain restrictions and other conditions set forth in the DRIP prospectus filed as part of the Company’s effective registration statement on Form S-3 filed with the SEC for the approximately 5.5 million shares of the General Partner’s common stock reserved for issuance under the DRIP. STOCK OPTION PLANS In May 2013, the General Partner established the 2013 Incentive Stock Plan (the “2013 Plan”) under which a total of 4,600,000 shares have been reserved for issuance. On June 5, 2015, in connection with employment agreements entered into with each of Messrs. Rudin and DeMarco, former chief executive officers (together, the “Executive Employment Agreements”), the Company granted options to purchase a total of 800,000 shares of the General Partner’s common stock, exercisable for a period of ten years with an exercise price equal to the closing price of the General Partner’s common stock on the grant date of $ 17.31 per share, with 400,000 of such options vesting in three equal annual installments commencing on the first anniversary of the grant date (“Time Vesting Options”) and fully vesting on June 5, 2018, and 400,000 of such options vesting if the General Partner’s common stock traded at or above $ 25.00 per share for 30 consecutive trading days while the executive is employed (“Price Vesting Options”), or on or before June 30, 2019, subject to certain conditions. The Price Vesting Options vested on July 5, 2016 on account of the price vesting condition being achieved. Pursuant to the Letter Agreement in connection with Ms. Gilmartin’s appointment as the Company’s interim Chief Executive Officer, the Company granted to MAG Partners fully vested stock options to purchase up to 230,000 shares of common stock with an exercise price of $ 14.39 per share, and up to 100,000 shares of common stock with an exercise price of $ 20.00 per share, pursuant to the Option Agreement. However, the options, and any shares received upon exercise, will terminate and be forfeited if the Board of Directors ends the Term for “cause” or MAG Partners terminates its arrangement with the Company (including a resignation by Ms. Gilmartin of her appointment as interim Chief Executive Officer, but excluding a termination because of a material breach of the arrangement by the Company or because Ms. Gilmartin has been appointed as the permanent Chief Executive Officer of the Company) before six months have elapsed, or if MAG Partners fails to comply with certain covenants in the Letter Agreement. 157,505 of the options have been granted subject to shareholder approval at the Company’s 2021 Annual Meeting of Stockholders; however, if a “change in control” transaction occurs before the date of such 2021 Annual Meeting, then such options would instead be canceled and cashed out upon such transaction for a value equal to their “spread value,” if any. See Note 13-Commitments and Contingencies. Information regarding the Company’s stock option plans is summarized below: Weighted Aggregate Average Intrinsic Shares Exercise Value Under Options Price $(000’s) Outstanding at January 1, 2018 ($ 17.31 ) 800,000 $ 17.31 $ 3,400 Granted, Lapsed or Cancelled - - Outstanding at December 31, 2018 ($ 17.31 ) 800,000 $ 17.31 1,824 Granted, Lapsed or Cancelled - - Outstanding at December 31, 2019 ($ 17.31 ) 800,000 $ 17.31 4,656 Granted 172,495 14.39 Outstanding at December 31, 2020 ($ 14.39 - $ 17.31 ) 972,495 $ 16.79 $ - Options exercisable at December 31, 2020 972,495 Available for grant at December 31, 2020 717,155 The weighted average fair value of options granted during the year ended December 31, 2020 was $ 2.95 per option. The fair value of each option grant is estimated on the date of grant using the Black-Scholes model. The following weighted average assumptions are included in the Company’s fair value calculations of stock options granted during the year ended December 31, 2020: Stock Options Expected life (in years) 5.3 Risk-free interest rate 0.41 % Volatility 31.0 % Dividend yield 2.7 % There were no stock options exercised under any stock option plans for the years ended December 31, 2020, 2019 and 2018. The Company has a policy of issuing new shares to satisfy stock option exercises. As of December 31, 2020 and 2019, the stock options outstanding had a weighted average remaining contractual life of approximately 3.6 years and 5.4 years, respectively. The Company recognized stock options expense of 446,000 , zero and $ 193,000 for the years ended December 31, 2020, 2019 and 2018, respectively. AO LTIP UNITS (Appreciation-Only LTIP Units) Pursuant to the terms of the DeMarco employment agreement, the Company entered into an AO Long-Term Incentive Plan Award Agreement (the “AO LTIP Award Agreement”) with Mr. DeMarco on March 13, 2019 that provided for the grant to Mr. DeMarco of 625,000 AO LTIP Units. AO LTIP Units are a class of partnership interests in the Operating Partnership that are intended to qualify as “profits interests” for federal income tax purposes and generally only allow the recipient to realize value to the extent the fair market value of a share of Common Stock exceeds the threshold level set at the time the AO LTIP Units are granted, subject to any vesting conditions applicable to the award. The threshold level was fixed at $ 21.46 in the AO LTIP Award Agreement, the closing price of the Common Stock as reported on the New York Stock Exchange (the “NYSE”) on the date of grant. The value of vested AO LTIP Units is realized through conversion of the AO LTIP Units into common units of limited partnership interests of the Operating Partnership (the “Common Units”). The number of Common Units into which vested AO LTIP Units may be converted is determined based on the quotient of (i) the excess of the fair market value of the Common Stock on the conversion date over the threshold level designated at the time the AO LTIP Unit was granted (i.e., $ 21.46 ), divided by (ii) the fair market value of the Common Stock on the conversion date. AO LTIP Units, once vested, have a finite term during which they may be converted into Common Units, within ten years from the grant date of the AO LTIP Units or they are forfeited. In addition, the AO LTIP Units issued to Mr. DeMarco are subject to the following vesting conditions: (i) 250,000 of the AO LTIP Units shall vest and become exercisable on the earliest date on which the closing price of the Common Stock, as reported on the NYSE, or if the Common Stock is not then traded on the NYSE, then the closing price of the Common Stock on any other securities exchange on which the Common Stock is traded or quoted (the “Securities Market”), has been equal to or greater than $ 25.00 per share for at least 30 consecutive trading days, provided that such date occurs prior to March 13, 2023 (the “Outside Date”); (ii) an additional 250,000 of the AO LTIP Units shall vest and become exercisable on the earliest date on which the closing price of the Common Stock, as reported on the NYSE, or if the Common Stock is not then traded on the NYSE, then the closing price of the Common Stock on the Securities Market, has been equal to or greater than $ 28.00 per share for at least 30 consecutive trading days, provided that such date occurs prior to the Outside Date; and (iii) an additional 125,000 of the AO LTIP Units shall vest and become exercisable on the earliest date on which the closing price of the Common Stock, as reported on the NYSE, or if the Common Stock is not then traded on the NYSE, then the closing price of the Common Stock on the Securities Market, has been equal to or greater than $ 31.00 per share for at least 30 consecutive trading days, provided that such date occurs prior to the Outside Date. Mr. DeMarco will generally receive special income allocations in respect of an AO LTIP Unit equal to 10 percent (or such other percentage specified in the applicable award agreement) of the income allocated in respect of a Common Unit. Upon conversion of AO LTIP Units to Common Units, Mr. DeMarco will be entitled to receive in respect of each such AO LTIP Unit, on a per unit basis, a special cash distribution equal to 10 % (or such other percentage specified in the applicable award agreement) of the distributions received by a holder of an equivalent number of Common Units during the period from the grant date of the AO LTIP Units through the date of conversion. The Company has reserved shares of common stock under the 2013 Plan for issuance upon vesting and conversion of the AO LTIP Units in accordance with their terms and conditions. The weighted average fair value of the AO LTIP Units granted during the year ended December 31, 2019 was $ 3.98 per AO LTIP Unit. The fair value of each AO LTIP Unit grant is estimated on the date of grant using the Monte Carlo method. The following weighted average assumptions were included in the Company’s fair value calculations of AO LTIP Units granted during the year ended December 31, 2019: AO LTIP Units Expected life (in years) 5.5 - 6.0 Risk-free interest rate 2.6 % Volatility 29.0 % Dividend yield 3.5 % As of December 31, 2020, the Company had $ 1.4 million of total unrecognized compensation cost related to unvested AO LTIP Units granted under the Company’s stock compensation plans. That cost is expected to be recognized over a remaining weighted average period of 2.2 years. The Company recognized AO LTIP unit expense of $ 622,000 , $ 498,000 and zero for the years ended December 31, 2020, 2019 and 2018, respectively. RESTRICTED STOCK AWARDS The Company has issued stock awards (“Restricted Stock Awards”) to officers, certain other employees and non-employee members of the Board of Directors of the General Partner, which allow the holders to each receive a certain amount of shares of the General Partner’s common stock generally over a one-year to seven-year vesting period, of which 52,974 unvested shares were legally outstanding at December 31, 2020. Vesting of the Restricted Stock Awards issued is based on time and service. On June 5, 2015, in connection with the new executive employment agreements signed at that time, the Company granted a total of 37,550.54 Restricted Stock Awards, which were valued in accordance with ASC 718 – Stock Compensation, at their fair value. These awards vested equally over a three year period on each annual anniversary date of the grant date. All currently outstanding and unvested Restricted Stock Awards provided to the officers, certain other employees, and members of the Board of Directors of the General Partner were issued under the 2013 Plan. Information regarding the Restricted Stock Awards grant activity is summarized below: Weighted-Average Grant – Date Shares Fair Value Outstanding at January 1, 2018 108,318 $ 25.49 Granted 40,185 20.16 Vested ( 72,502 ) 25.33 Forfeited ( 8,712 ) 25.83 Outstanding at December 31, 2018 67,289 $ 22.43 Granted 42,690 21.08 Vested ( 65,353 ) 22.34 Forfeited ( 1,936 ) 25.83 Outstanding at December 31, 2019 42,690 $ 21.08 Granted 52,974 15.29 Vested ( 42,690 ) 21.08 Forfeited - - Outstanding at December 31, 2020 52,974 $ 15.29 As of December 31, 2020, the Company had $ 0.4 million of total unrecognized compensation cost related to unvested Restricted Stock Awards granted under the Company’s stock compensation plans. That cost is expected to be recognized over a weighted average period of 0.5 years. LONG-TERM INCENTIVE PLAN AWARDS On March 8, 2016, the Company granted Long-Term Incentive Plan (“LTIP”) awards to senior management of the Company, including the General Partner’s executive officers (the “2016 LTIP Awards”). All of the 2016 LTIP Awards were in the form of units in the Operating Partnership (“LTIP Units”) and constitute awards under the 2013 Plan. For Messrs. Rudin, DeMarco and Tycher, approximately 25 percent of the target 2016 LTIP Award was in the form of a time-based award that vested after three year s on March 8, 2019 (the “2016 TBV LTIP Units”), and the remaining approximately 75 percent of the target 2016 LTIP Award was in the form of a performance-based award under a new Outperformance Plan (the “2016 OPP”) adopted by the General Partner’s Board of Directors consisting of a multi-year, performance-based equity compensation plan and related forms of award agreement (the “2016 PBV LTIP Units”). For all other executive officers, approximately 40 percent of the target 2016 LTIP Award was in the form of 2016 TBV LTIP Units and the remaining approximately 60 percent of the target 2016 LTIP Award was in the form of 2016 PBV LTIP Units. The 2016 TBV LTIP Units vested on March 8, 2019. The 2016 OPP was designed to align the interests of senior management to relative and absolute performance of the Company over a three year performance period from March 8, 2016 through March 7, 2019. Participants in the 2016 OPP would only earn the full awards if, over the three year performance period, the Company achieves a 50 percent absolute total stockholder return (“TSR”) and if the Company is in the 75th percentile of performance versus the NAREIT Office Index. As the targets for vesting were not achieved, the 2016 PBV LTIP Units did not vest and were forfeited. On April 4, 2017, the Company granted LTIP awards to senior management of the Company, including the General Partner’s executive officers (the “2017 LTIP Awards”). All of the 2017 LTIP Awards were in the form of LTIP Units and constitute awards under the 2013 Plan. For Messrs. DeMarco, Tycher and Rudin, approximately twenty-five percent ( 25 %) of the 2017 LTIP Award was in the form of a time-based award that vested after three year s on April 4, 2020 (the “2017 TBV LTIP Units”), and the remaining approximately seventy-five percent ( 75 %) of the 2017 LTIP Award was in the form of a performance-based award under the Company’s Outperformance Plan (the “2017 OPP”) adopted by the General Partner’s Board of Directors, consisting of a multi-year, performance-based equity compensation plan and related forms of award agreement (the “2017 PBV LTIP Units”). For all other executive officers, approximately forty percent ( 40 %) of the 2017 LTIP Award was in the form of 2017 TBV LTIP Units and the remaining approximately sixty percent ( 60 %) of the 2017 LTIP Award was in the form of 2017 PBV LTIP Units. The 2017 TBV LTIP Units vested on April 4, 2020. The 2017 OPP was designed to align the interests of senior management to relative and absolute performance of the Company over a three-year performance period from April 4, 2017 through April 3, 2020. Participants in the 2017 OPP will only earn the full awards if, over the three year performance period, the Company achieves a thirty-six percent ( 36 %) absolute TSR and if the Company is in the 75th percentile of performance as compared to the NAREIT office index. As the targets for vesting were not achieved, the 2017 PBV LTIP Units did not vest and were forfeited. On April 20, 2018, the Company granted LTIP awards to senior management of the Company, including the General Partner’s executive officers (the “2018 LTIP Awards”). All of the 2018 LTIP Awards were in the form of LTIP Units and constitute awards under the 2013 Plan. For Messrs. DeMarco and Tycher, approximately twenty-five percent ( 25 %) of the grant date fair value of the 2018 LTIP Award was in the form of a time-based award that vests after three year s on April 20, 2021 (the “2018 TBV LTIP Units”), and the remaining approximately seventy-five percent ( 75 %) of the grant date fair value of the 2018 LTIP Award was in the form of a performance-based award under the Company’s Outperformance Plan (the “2018 OPP”) adopted by the General Partner’s Board of Directors, consisting of a multi-year, performance-based equity compensation plan and related forms of award agreement (the “2018 PBV LTIP Units”). For all other executive officers, approximately fifty percent ( 50 %) of the grant date fair value of the 2018 LTIP Award was in the form of 2018 TBV LTIP Units and the remaining approximately fifty percent ( 50 %) of the grant date fair value of the 2018 LTIP Award was in the form of 2018 PBV LTIP Units. The 2018 OPP was designed to align the interests of senior management to relative and absolute performance of the Company over a three year performance period from April 20, 2018 through April 19, 2021. Participants in the 2018 OPP will only earn the full awards if, over the three-year performance period, the Company achieves a thirty-six percent ( 36 %) absolute TSR and if the Company’s TSR is in the 75th percentile of performance as compared to the office REITs in the NAREIT index. On March 22, 2019, the Company granted LTIP awards to senior management of the Company, including the General Partner’s executive officers (the “2019 LTIP Awards”). All of the 2019 LTIP Awards were in the form of LTIP Units and constitute awards under the 2013 Plan. For Mr. DeMarco, approximately 25 percent of the target 2019 LTIP Awards were in the form of time-based LTIP Units that vest after three years on March 22, 2022 (the “2019 TBV LTIP Units”), and the remaining approximately 75 percent of the grant date fair value of his 2019 LTIP Award will be in the form of performance-based LTIP Units under the Company’s Outperformance Plan (the “2019 OPP”) adopted by the General Partner’s Board of Directors, consisting of a multi-year, performance-based equity compensation plan and related forms of award agreement (the “2019 PBV LTIP Units”). For Messrs. Tycher, Smetana, Wagner, Cardoso and Hilton, fifty percent ( 50 %) of the grant date fair value of their respective 2019 LTIP Awards is in the form of 2019 TBV LTIP Units and the remaining fifty percent ( 50 %) of the grant date fair value of their respective 2019 LTIP Awards is in the form of 2019 PBV LTIP Units. Mr. DeBari, who was promoted to Chief Accounting Officer on March 13, 2019, received 100 percent of his 2019 LTIP Award in the form of 2019 TBV LTIP Units. The 2019 OPP was designed to align the interests of senior management to relative and absolute performance of the Company over a three year performance period from March 22, 2019 through March 21, 2022. Participants of performance-based awards in the 2019 OPP will only earn the full awards if, over the three year performance period, the Company achieves a thirty-six percent ( 36 %) absolute total stockholder return (“TSR”) and if the Company’s TSR is in the 75th percentile of performance as compared to the office REITs in the NAREIT index. On March 24, 2020, the Company granted LTIP awards to senior management of the Company, including the General Partner’s executive officers (the “2020 LTIP Awards”). All of the 2020 LTIP Awards were in the form of LTIP Units and constitute awards under the 2013 Plan. All of the target 2020 LTIP Awards were in the form of performance-based LTIP Units under the Company’s Outperformance Plan (the “2020 OPP”) adopted by the General Partner’s Board of Directors, consisting of a multi-year, performance-based equity compensation plan and related forms of award agreement (the “2020 PBV LTIP Units”). The 2020 OPP was designed to align the interests of senior management to relative and absolute performance of the Company over a three year performance period from March 24, 2020 through March 23, 2023. Participants of performance-based awards in the 2020 OPP will only earn the full awards if, over the three year performance period, the Company achieves a thirty six percent ( 36 %) absolute total stockholder return (“TSR”) and if the Company’s TSR is in the 75th percentile of performance as compared to the REITs in the NAREIT index. LTIP Units will remain subject to forfeiture depending on the extent that the 2018 LTIP Awards, 2019 LTIP Awards and 2020 LTIP Awards vest. The number of LTIP Units to be issued initially to recipients of the 2018 PBV LTIP Awards, 2019 PBV LTIP Awards and 2020 PBV LTIP Awards is the maximum number of LTIP Units that may be earned under the awards. The number of LTIP Units that actually vest for each award recipient will be determined at the end of the performance measurement period. TSR for the Company and for the Index over the three year measurement period and other circumstances will determine how many LTIP Units vest for each recipient; if they are fewer than the number issued initially, the balance will be forfeited as of the performance measurement date. On January 4, 2021, in accordance with Mr. Cardoso’s employment agreement, the Company granted LTIP awards (the “J Series 2021 LTIP Awards”). All of the J Series 2021 LTIP Awards were in the form of LTIP Units and constitute awards under the 2013 Plan. All of the target 2020 LTIP Awards were in the form of performance-based LTIP Units under the Company’s Outperformance Plan (the “J Series 2021 OPP”) adopted by the General Partner’s Board of Directors, consisting of a multi-year, performance-based equity compensation plan and related forms of award agreement. The J Series 2021 OPP was subject to the achievement of certain sales performance milestones with respect to commercial asset dispositions by the Company over a performance period from August 1, 2020 through December 31, 2022. These sales milestones will be based on the aggregate gross sales prices of the assets, provided that the asset will only be included in the milestone if it is sold for not less than 85 % of its estimated net asset value, as defined in the agreement. Prior to vesting, recipients of LTIP Units will be entitled to receive per unit distributions equal to one-tenth ( 10 percent) of the regular quarterly distributions payable on a Common Unit, but will not be entitled to receive any special distributions. Distributions with respect to the other nine-tenths ( 90 percent) of regular quarterly distributions payable on a common unit will accrue but shall only become payable upon vesting of the LTIP Unit. After vesting of the 2018 TBV LTIP Units, 2019 TBV LTIP Units and 2020 TBV LTIP Units or the end of the measurement period for the 2018 PBV LTIP Units, 2019 PBV LTIP Units and 2020 PBV LTIP Units, the number of LTIP Units, both vested and unvested, will be entitled to receive distributions in an amount per unit equal to distributions, both regular and special, payable on a Common Unit. As a result of targets not being achieved or management and other personnel changes during the year ended December 31, 2020, the employees forfeited and cancelled, 369,924 2017 LTIP Awards, 102,639 2018 LTIP Awards, 175,570 2019 LTIP Awards and 567,254 2020 LTIP Awards. As of December 31, 2020, a total of 3,718 2016 PBV LTIP Units, 68,205 2016 TBV LTIP Units, 10,264 2017 PBV LTIP Units, 70,772 2017 TBV LTIP Units, 542,651 2018 PBV LTIP Units, 177,179 2018 TBV LTIP Units, 249,058 2019 PBV LTIP Units and 140,995 2019 TBV LTIP Units, and 720,314 2020 PBV LTIP Units, net of LTIP Units forfeited and cancelled, were outstanding. The LTIP Units were valued in accordance with ASC 718 – Stock Compensation, at their fair value. The Company has reserved shares of common stock under the 2013 Plan for issuance upon vesting and conversion of the LTIP Units in accordance with their terms and conditions. As of December 31, 2020, the Company had $ 8.0 million of total unrecognized compensation cost related to unvested LTIP awards granted under the Company’s stock compensation plans. That cost is expected to be recognized over a weighted average period of 2.3 years. DEFERRED STOCK COMPENSATION PLAN FOR DIRECTORS The Amended and Restated Deferred Compensation Plan for Directors, which commenced January 1, 1999, allows non - employee directors of the Company to elect to defer up to 100 percent of their annual retainer fee into deferred stock units. The deferred stock units are convertible into an equal number of shares of common stock upon the directors’ termination of service from the Board of Directors or a change in control of the Company, as defined in the plan. Pursuant to the termination of service of five directors from the Board of Directors on June 12, 2019, the Company converted 193,949 deferred stock units into shares of common stock. Pursuant to the termination of service of two directors from the Board of Directors on June 12, 2020, the Company converted 61,277 deferred stock units into shares of common stock. Deferred stock units are credited to each director quarterly using the closing price of the Company’s common stock on the applicable dividend record date for the respective quarter. Each participating director’s account is also credited for an equivalent amount of deferred stock units based on the dividend rate for each quarter. During the years ended December 31, 2020, 2019 and 2018, 22,086 , 14,337 and 26,620 deferred stock units were earned, respectively. As of December 31, 2020 and 2019, there were 17,854 and 59,899 deferred stock units outstanding, respectively. EARNINGS PER SHARE/UNIT Basic EPS or EPU excludes dilution and is computed by dividing net income available to common shareholders or unitholders by the weighted average number of shares or units outstanding for the period. Diluted EPS or EPU reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock. In the calculation of basic and diluted EPS and EPU, a redemption value adjustment of redeemable noncontrolling interests attributable to common shareholders or unitholders is included in the calculation to arrive at the numerator of net income (loss) available to common shareholders or unitholders. The following information presents the Company’s results for the years ended December 31, 2020, 2019 and 2018 in accordance with ASC 260, Earnings Per Share (dollars in thousands, except per share amounts) : Mack-Cali Realty Corporation: Year Ended December 31, Computation of Basic EPS 2020 2019 2018 Income (loss) from continuing operations $ ( 115,523 ) $ 252,820 $ 82,824 Add (deduct): Noncontrolling interests in consolidated joint ventures 2,695 3,904 1,216 Add (deduct): Noncontrolling interests in Operating Partnership 13,279 ( 23,720 ) ( 7,127 ) Add (deduct): Redeemable noncontrolling interests ( 25,883 ) ( 22,615 ) ( 13,979 ) Add (deduct): Redemption value adjustment of redeemable noncontrolling interests attributable to common shareholders ( 11,814 ) ( 25,885 ) ( 11,425 ) Income (loss) from continuing operations available to common shareholders ( 137,246 ) 184,504 51,509 Income (loss) from discontinued operations available to common shareholders 74,045 ( 98,528 ) 21,177 Net income (loss) available to common shareholders for basic earnings per share $ ( 63,201 ) $ 85,976 $ 72,686 Weighted average common shares 90,648 90,557 90,388 Basic EPS : Income (loss) from continuing operations available to common shareholders $ ( 1.51 ) $ 2.04 $ 0.57 Income (loss) from discontinued operations available to common shareholders 0.81 ( 1.09 ) 0.23 Net income (loss) available to common shareholders $ ( 0.70 ) $ 0.95 $ 0.80 Year Ended December 31, Computation of Diluted EPS 2020 2019 2018 Net income (loss) from continuing operations available to common shareholders $ ( 137,246 ) $ 184,504 $ 51,509 Add (deduct): Noncontrolling interests in Operating Partnership ( 13,279 ) 23,720 7,127 Add (deduct): Redemption value adjustment of redeemable noncontrolling interests attributable to the Operating Partnership unitholders ( 1,254 ) ( 2,855 ) ( 1,296 ) Income (loss) from continuing operations for diluted earnings per share ( 151,779 ) 205,369 57,340 Income (loss) from discontinued operations for diluted earnings per share 81,925 ( 108,984 ) 23,577 Net income (loss) available for diluted earnings per share $ ( 69,854 ) $ 96,385 $ 80,917 Weighted average common shares 100,260 100,689 100,724 Diluted EPS : Income (loss) from continuing operations available to common shareholders $ ( 1.51 ) $ 2.04 $ 0.57 Income (loss) from discontinued operations available to common shareholders 0.81 ( 1.09 ) 0.23 Net income (loss) available to common shareholders $ ( 0.70 ) $ 0.95 $ 0.80 The following schedule reconciles the weighted average shares used in the basic EPS calculation to the shares used in the diluted EPS calculation (in thousands): Year Ended December 31, 2020 2019 2018 Basic EPS shares 90,648 90,557 90,388 Add: Operating Partnership – common and vested LTIP units 9,612 9,963 10,246 Restricted Stock Awards - - - Stock Options - 169 90 Diluted EPS Shares 100,260 100,689 100,724 Contingently issuable shares under Restricted Stock Awards were excluded from the denominator during all periods presented as such securities were anti-dilutive during the periods. Shares issuable under all outstanding stock options were excluded from the denominator in the year ended December 31, 2020 as such securities were anti-dilutive during the period. Also not included in the computations of diluted EPS were the unvested LTIP Units and unvested AO LTIP Units as such securities were anti-dilutive during all periods presented. Unvested LTIP Units outstanding as of December 31, 2020, 2019 and 2018 were 1,722,929 , 1,826,331 and 1,707,106 , respectively. Unvested restricted stock outstanding as of December 31, 2020, 2019 and 2018 were 52,974 , 42,690 and 67,289 shares, respectively. Unvested AO LTIP Units outstanding as of each of December 31, 2020 and 2019 were 625,000 . Dividends declared per common share for the years ended December 31, 2020, 2019 and 2018 was $ 0.40 , $ 0.80 a

Noncontrolling Interests In Sub

Noncontrolling Interests In Subsidiaries	12 Months Ended
	Dec. 31, 2020
Noncontrolling Interest [Line Items]
Noncontrolling Interests In Subsidiaries	17. NONCONTROLLING INTERESTS IN SUBSIDIARIES Noncontrolling interests in subsidiaries in the accompanying consolidated financial statements relate to (i) common units (“Common Units”) and LTIP units in the Operating Partnership, held by parties other than the General Partner (“Limited Partners”), and (ii) interests in consolidated joint ventures for the portion of such ventures not owned by the Company. Pursuant to ASC 810, Consolidation, on the accounting and reporting for noncontrolling interests and changes in ownership interests of a subsidiary, changes in a parent’s ownership interest (and transactions with noncontrolling interests unitholders in the subsidiary) while the parent retains its controlling interest in its subsidiary should be accounted for as equity transactions. The carrying value of the noncontrolling interests shall be adjusted to reflect the change in its ownership interest in the subsidiary, with the offset to equity attributable to the parent. Accordingly, as a result of equity transactions which caused changes in ownership percentages between Mack-Cali Realty Corporation stockholders’ equity and noncontrolling interests in the Operating Partnership that occurred during the year ended December 31, 2020, the Company has decreased noncontrolling interests in the Operating Partnership and increased additional paid-in capital in Mack-Cali Realty Corporation stockholders’ equity by approximately $ 2.6 million as of December 31, 2020. NONCONTROLLING INTERESTS IN OPERATING PARTNERSHIP (applicable only to General Partner) Common Units During the year ended December 31, 2020, the Company redeemed for cash 138,615 common units at their fair market value of $ 2.7 million. Certain individuals and entities own common units in the Operating Partnership. A common unit and a share of Common Stock of the General Partner have substantially the same economic characteristics in as much as they effectively share equally in the net income or loss of the Operating Partnership. Common unitholders have the right to redeem their common units, subject to certain restrictions. The redemption is required to be satisfied in shares of Common Stock, cash, or a combination thereof, calculated as follows: one share of the General Partner’s Common Stock, or cash equal to the fair market value of a share of the General Partner’s Common Stock at the time of redemption, for each common unit. The General Partner, in its sole discretion, determines the form of redemption of common units (i.e., whether a common unitholder receives Common Stock, cash, or any combination thereof). If the General Partner elects to satisfy the redemption with shares of Common Stock as opposed to cash, it is obligated to issue shares of its Common Stock to the redeeming unitholder. Regardless of the rights described above, the common unitholders may not put their units for cash to the General Partner or the Operating Partnership under any circumstances. When a unitholder redeems a common unit, noncontrolling interests in the Operating Partnership is reduced and Mack-Cali Realty Corporation Stockholders’ equity is increased. LTIP Units On March 8, 2016, the Company granted 2016 LTIP Awards to senior management of the Company, including the General Partner’s executive officers. On April 4, 2017, the Company granted 2017 LTIP Awards to senior management of the Company, including the General Partner’s executive officers. On April 20, 2018, the Company granted 2018 LTIP Awards to senior management of the Company, including the General Partner’s executive officers. On March 22, 2019, the Company granted 2019 LTIP Awards to senior management of the Company, including the General Partner’s executive officers. On March 24, 2020, the Company granted 2020 LTIP Awards to senior management of the Company, including the General Partner’s executive officers. All of the 2016 LTIP Awards, 2017 LTIP Awards, 2018 LTIP Awards,2019 LTIP Awards and 2020 LTIP Awards are in the form of units in the Operating Partnership. See Note 16: Mack-Cali Realty Corporation Stockholders’ Equity and Mack-Cali Realty, L.P.’s Partners’ Capital – Long-Term Incentive Plan Awards. LTIP Units are designed to qualify as “profits interests” in the Operating Partnership for federal income tax purposes. As a general matter, the profits interests characteristics of the LTIP Units mean that initially they will not be economically equivalent in value to a common unit. If and when events specified by applicable tax regulations occur, LTIP Units can over time increase in value up to the point where they are equivalent to common units on a one-for-one basis. After LTIP Units are fully vested, and to the extent the special tax rules applicable to profits interests have allowed them to become equivalent in value to common units, LTIP Units may be converted on a one-for-one basis into common units. Common units in turn have a one-for-one relationship in value with shares of the General Partner’s common stock, and are redeemable on a one-for-one basis for cash or, at the election of the Company, shares of the General Partner’s common stock. AO LTIP Units (Appreciation-Only LTIP Units) On March 13, 2019, the Company granted 625,000 AO LTIP Units to Mr. DeMarco pursuant to the AO Long-Term Incentive Plan Award Agreement. See Note 16: Mack-Cali Realty Corporation Stockholders’ Equity and Mack-Cali Realty, L.P.’s Partners’ Capital – AO LTIP Units (Appreciation-Only LTIP Units). AO LTIP Units are a class of partnership interests in the Operating Partnership that are intended to qualify as “profit interests” for federal income tax purposes and generally only allow the recipient to realize value to the extent the fair market value of a share of Common Stock exceeds the threshold level set at the time the AO LTIP Units are granted, subject to any vesting conditions applicable to the award. The value of vested AO LTIP Units is realized through conversion of the AO LTIP Units into Common Units. The number of Common Units into which vested AO LTIP Units may be converted is determined based on the quotient of (i) the excess of the fair market value of the Common Stock on the conversion date over the threshold level designated at the time the AO LTIP Unit was granted, divided by (ii) the fair market value of the Common Stock on the conversion date. AO LTIP Units, once vested, have a finite term during which they may be converted into Common Units, not in excess of ten years from the grant date of the AO LTIP Units. Unit Transactions The following table sets forth the changes in noncontrolling interests in subsidiaries which relate to the common units and LTIP units in the Operating Partnership for the years ended December 31, 2020, 2019 and 2018: Common Units/ Unvested LTIP Vested LTIP Units Units Balance at January 1, 2018 10,438,855 1,230,877 Redemption of common units for shares of common stock ( 264,570 ) - Redemption of common units - - Conversion of vested LTIP units to common units - - Vested LTIP units 55,064 ( 55,064 ) Issuance of units - 864,024 Cancellation of units - ( 332,731 ) Balance at December 31, 2018 10,229,349 1,707,106 Redemption of common units for shares of common stock ( 38,011 ) - Redemption of common units ( 665,918 ) - Conversion of vested LTIP units to common units 18,438 Vested LTIP units 68,206 ( 86,644 ) Issuance of units - 565,623 Cancellation of units - ( 359,754 ) Balance at December 31, 2019 9,612,064 1,826,331 Redemption of common units for shares of common stock - - Redemption of common units ( 138,615 ) - Conversion of vested LTIP units to common units 38,626 - Vested LTIP units 136,957 ( 175,583 ) Issuance of units - 1,287,568 Cancellation of units ( 1 ) ( 1,215,387 ) Balance at December 31, 2020 9,649,031 1,722,929 Noncontrolling Interests Ownership in Operating Partnership As of December 31, 2020 and 2019, the noncontrolling interests common unitholders owned 9.6 percent and 9.6 percent of the Operating Partnership, respectively. NONCONTROLLING INTERESTS IN CONSOLIDATED JOINT VENTURES (applicable to General Partner and Operating Partnership) The Company consolidates certain joint ventures in which it has ownership interests. Various entities and/or individuals hold noncontrolling interests in these ventures. PARTICIPATION RIGHTS The Company’s interests in certain real estate projects ( one property and one potential future development) each provide for the initial distributions of net cash flow solely to the Company, and thereafter, other parties have participation rights in 50 percent of the excess net cash flow remaining after the distribution to the Company of the aggregate amount equal to the sum of: (a) the Company’s capital contributions, plus (b) an IRR of 10 percent per annum.
Mack-Cali Realty LP [Member]
Noncontrolling Interest [Line Items]
Noncontrolling Interests In Subsidiaries	17. NONCONTROLLING INTERESTS IN SUBSIDIARIES Noncontrolling interests in subsidiaries in the accompanying consolidated financial statements relate to (i) common units (“Common Units”) and LTIP units in the Operating Partnership, held by parties other than the General Partner (“Limited Partners”), and (ii) interests in consolidated joint ventures for the portion of such ventures not owned by the Company. Pursuant to ASC 810, Consolidation, on the accounting and reporting for noncontrolling interests and changes in ownership interests of a subsidiary, changes in a parent’s ownership interest (and transactions with noncontrolling interests unitholders in the subsidiary) while the parent retains its controlling interest in its subsidiary should be accounted for as equity transactions. The carrying value of the noncontrolling interests shall be adjusted to reflect the change in its ownership interest in the subsidiary, with the offset to equity attributable to the parent. Accordingly, as a result of equity transactions which caused changes in ownership percentages between Mack-Cali Realty Corporation stockholders’ equity and noncontrolling interests in the Operating Partnership that occurred during the year ended December 31, 2020, the Company has decreased noncontrolling interests in the Operating Partnership and increased additional paid-in capital in Mack-Cali Realty Corporation stockholders’ equity by approximately $ 2.6 million as of December 31, 2020. NONCONTROLLING INTERESTS IN OPERATING PARTNERSHIP (applicable only to General Partner) Common Units During the year ended December 31, 2020, the Company redeemed for cash 138,615 common units at their fair market value of $ 2.7 million. Certain individuals and entities own common units in the Operating Partnership. A common unit and a share of Common Stock of the General Partner have substantially the same economic characteristics in as much as they effectively share equally in the net income or loss of the Operating Partnership. Common unitholders have the right to redeem their common units, subject to certain restrictions. The redemption is required to be satisfied in shares of Common Stock, cash, or a combination thereof, calculated as follows: one share of the General Partner’s Common Stock, or cash equal to the fair market value of a share of the General Partner’s Common Stock at the time of redemption, for each common unit. The General Partner, in its sole discretion, determines the form of redemption of common units (i.e., whether a common unitholder receives Common Stock, cash, or any combination thereof). If the General Partner elects to satisfy the redemption with shares of Common Stock as opposed to cash, it is obligated to issue shares of its Common Stock to the redeeming unitholder. Regardless of the rights described above, the common unitholders may not put their units for cash to the General Partner or the Operating Partnership under any circumstances. When a unitholder redeems a common unit, noncontrolling interests in the Operating Partnership is reduced and Mack-Cali Realty Corporation Stockholders’ equity is increased. LTIP Units On March 8, 2016, the Company granted 2016 LTIP Awards to senior management of the Company, including the General Partner’s executive officers. On April 4, 2017, the Company granted 2017 LTIP Awards to senior management of the Company, including the General Partner’s executive officers. On April 20, 2018, the Company granted 2018 LTIP Awards to senior management of the Company, including the General Partner’s executive officers. On March 22, 2019, the Company granted 2019 LTIP Awards to senior management of the Company, including the General Partner’s executive officers. On March 24, 2020, the Company granted 2020 LTIP Awards to senior management of the Company, including the General Partner’s executive officers. All of the 2016 LTIP Awards, 2017 LTIP Awards, 2018 LTIP Awards,2019 LTIP Awards and 2020 LTIP Awards are in the form of units in the Operating Partnership. See Note 16: Mack-Cali Realty Corporation Stockholders’ Equity and Mack-Cali Realty, L.P.’s Partners’ Capital – Long-Term Incentive Plan Awards. LTIP Units are designed to qualify as “profits interests” in the Operating Partnership for federal income tax purposes. As a general matter, the profits interests characteristics of the LTIP Units mean that initially they will not be economically equivalent in value to a common unit. If and when events specified by applicable tax regulations occur, LTIP Units can over time increase in value up to the point where they are equivalent to common units on a one-for-one basis. After LTIP Units are fully vested, and to the extent the special tax rules applicable to profits interests have allowed them to become equivalent in value to common units, LTIP Units may be converted on a one-for-one basis into common units. Common units in turn have a one-for-one relationship in value with shares of the General Partner’s common stock, and are redeemable on a one-for-one basis for cash or, at the election of the Company, shares of the General Partner’s common stock. AO LTIP Units (Appreciation-Only LTIP Units) On March 13, 2019, the Company granted 625,000 AO LTIP Units to Mr. DeMarco pursuant to the AO Long-Term Incentive Plan Award Agreement. See Note 16: Mack-Cali Realty Corporation Stockholders’ Equity and Mack-Cali Realty, L.P.’s Partners’ Capital – AO LTIP Units (Appreciation-Only LTIP Units). AO LTIP Units are a class of partnership interests in the Operating Partnership that are intended to qualify as “profit interests” for federal income tax purposes and generally only allow the recipient to realize value to the extent the fair market value of a share of Common Stock exceeds the threshold level set at the time the AO LTIP Units are granted, subject to any vesting conditions applicable to the award. The value of vested AO LTIP Units is realized through conversion of the AO LTIP Units into Common Units. The number of Common Units into which vested AO LTIP Units may be converted is determined based on the quotient of (i) the excess of the fair market value of the Common Stock on the conversion date over the threshold level designated at the time the AO LTIP Unit was granted, divided by (ii) the fair market value of the Common Stock on the conversion date. AO LTIP Units, once vested, have a finite term during which they may be converted into Common Units, not in excess of ten years from the grant date of the AO LTIP Units. Unit Transactions The following table sets forth the changes in noncontrolling interests in subsidiaries which relate to the common units and LTIP units in the Operating Partnership for the years ended December 31, 2020, 2019 and 2018: Common Units/ Unvested LTIP Vested LTIP Units Units Balance at January 1, 2018 10,438,855 1,230,877 Redemption of common units for shares of common stock ( 264,570 ) - Redemption of common units - - Conversion of vested LTIP units to common units - - Vested LTIP units 55,064 ( 55,064 ) Issuance of units - 864,024 Cancellation of units - ( 332,731 ) Balance at December 31, 2018 10,229,349 1,707,106 Redemption of common units for shares of common stock ( 38,011 ) - Redemption of common units ( 665,918 ) - Conversion of vested LTIP units to common units 18,438 Vested LTIP units 68,206 ( 86,644 ) Issuance of units - 565,623 Cancellation of units - ( 359,754 ) Balance at December 31, 2019 9,612,064 1,826,331 Redemption of common units for shares of common stock - - Redemption of common units ( 138,615 ) - Conversion of vested LTIP units to common units 38,626 - Vested LTIP units 136,957 ( 175,583 ) Issuance of units - 1,287,568 Cancellation of units ( 1 ) ( 1,215,387 ) Balance at December 31, 2020 9,649,031 1,722,929 Noncontrolling Interests Ownership in Operating Partnership As of December 31, 2020 and 2019, the noncontrolling interests common unitholders owned 9.6 percent and 9.6 percent of the Operating Partnership, respectively. NONCONTROLLING INTERESTS IN CONSOLIDATED JOINT VENTURES (applicable to General Partner and Operating Partnership) The Company consolidates certain joint ventures in which it has ownership interests. Various entities and/or individuals hold noncontrolling interests in these ventures. PARTICIPATION RIGHTS The Company’s interests in certain real estate projects ( one property and one potential future development) each provide for the initial distributions of net cash flow solely to the Company, and thereafter, other parties have participation rights in 50 percent of the excess net cash flow remaining after the distribution to the Company of the aggregate amount equal to the sum of: (a) the Company’s capital contributions, plus (b) an IRR of 10 percent per annum.

Segment Reporting

Segment Reporting	12 Months Ended
	Dec. 31, 2020
Segment Reporting Information [Line Items]
Segment Reporting	18. SEGMENT REPORTING The Company operates in two business segments: (i) commercial and other real estate and (ii) multi-family real estate and services. The Company provides leasing, property management, acquisition, development, construction and tenant-related services for its commercial and other real estate and multi-family real estate portfolio. The Company’s multi - family services business also provides similar services for third parties. The Company had no revenues from foreign countries recorded for the years ended December 31, 2020, 2019 and 2018. The Company had no long lived assets in foreign locations as of December 31, 2020 and 2019. The accounting policies of the segments are the same as those described in Note 2: Significant Accounting Policies, excluding depreciation and amortization. The Company evaluates performance based upon net operating income from the combined properties and operations in each of its real estate segments (commercial and other real estate, and multi-family real estate and services). All properties classified as discontinued operations have been excluded. Selected results of operations for the years ended December 31, 2020, 2019 and 2018, and selected asset information as of December 31, 2020 and 2019 regarding the Company’s operating segments are as follows. Amounts for prior periods have been restated to conform to the current period segment reporting presentation (dollars in thousands) : Commercial Multi-family Corporate Total & Other Real Estate Real Estate & Services (d) & Other (e) Company Total revenues: 2020 $ 155,045 $ 156,841 $ 1,676 $ 313,562 2019 184,966 170,833 1,403 357,202 2018 257,487 113,805 432 371,724 Total operating and interest expenses (a): 2020 $ 73,184 $ 95,631 $ 127,184 $ 295,999 2019 80,050 89,512 127,425 296,987 2018 116,912 70,279 98,797 285,988 Equity in earnings (loss) of unconsolidated joint ventures: Three months ended: 2020 $ ( 2,254 ) $ ( 1,578 ) $ - $ ( 3,832 ) 2019 ( 1,194 ) ( 125 ) - ( 1,319 ) 2018 2,319 ( 2,446 ) - ( 127 ) Net operating income (loss) (b): Three months ended: 2020 $ 79,607 $ 59,632 $ ( 125,508 ) $ 13,731 2019 103,722 81,196 ( 126,022 ) 58,896 2018 142,894 41,080 ( 98,365 ) 85,609 Total assets: 2020 $ 1,881,161 $ 3,249,516 $ 17,109 $ 5,147,786 2019 2,178,321 3,079,409 35,068 5,292,798 Total long-lived assets (c): 2020 $ 1,693,054 $ 3,035,485 $ ( 1,411 ) $ 4,727,128 2019 1,947,053 2,812,306 3,834 4,763,193 Total investments in unconsolidated joint ventures: 2020 $ 5,555 $ 156,827 $ - $ 162,382 2019 7,367 201,724 - 209,091 (a) Total operating and interest expenses represent the sum of: real estate taxes; utilities; operating services; real estate services expenses; general and administrative, acquisition-related costs and interest expense (net of interest income). All interest expense, net of interest and other investment income, (including for property-level mortgages) is excluded from segment amounts and classified in Corporate & Other for all periods. (b) Net operating income represents total revenues less total operating and interest expenses (as defined and classified in Note “a”), plus equity in earnings (loss) of unconsolidated joint ventures, for the period. (c) Long-lived assets are comprised of net investment in rental property, unbilled rents receivable and goodwill. (d) Segment assets and operations were owned through a consolidated variable interest entity commencing in February 2018, and which also include the Company’s consolidated hotel operations. (e) Corporate & Other represents all corporate-level items (including interest and other investment income, interest expense, non-property general and administrative expense), as well as intercompany eliminations necessary to reconcile to consolidated Company totals. Mack-Cali Realty Corporation The following schedule reconciles net operating income to net income available to common shareholders (dollars in thousands) : Year Ended December 31, 2020 2019 2018 Net operating income $ 13,731 $ 58,896 $ 85,609 Add (deduct): Depreciation and amortization ( 122,035 ) ( 133,597 ) ( 113,817 ) Land and other impairments ( 16,817 ) ( 32,444 ) ( 24,566 ) Property impairments ( 36,582 ) - - Gain on change of control of interests - 13,790 14,217 Realized gains (losses) and unrealized losses on disposition of rental property, net 5,481 343,102 99,436 Gain on disposition of developable land 5,787 522 30,939 Gain on sale from unconsolidated joint ventures 35,184 903 - Gain (loss) from extinguishment of debt, net ( 272 ) 1,648 ( 8,994 ) Income (loss) from continuing operations ( 115,523 ) 252,820 82,824 Discontinued operations Income from discontinued operations 70,724 24,366 23,577 Realized gains (losses) and unrealized losses on disposition of rental property and impairments, net 11,201 ( 133,350 ) - Total discontinued operations, net 81,925 ( 108,984 ) 23,577 Net income (loss) ( 33,598 ) 143,836 106,401 Noncontrolling interests in consolidated joint ventures 2,695 3,904 1,216 Noncontrolling interests in Operating Partnership 13,279 ( 23,720 ) ( 7,127 ) Noncontrolling interest in discontinued operations ( 7,880 ) 10,456 ( 2,400 ) Redeemable noncontrolling interests ( 25,883 ) ( 22,615 ) ( 13,979 ) Net income (loss) available to common shareholders $ ( 51,387 ) $ 111,861 $ 84,111 Mack-Cali Realty, L.P. The following schedule reconciles net operating income to net income available to common unitholders (dollars in thousands) : Year Ended December 31, 2020 2019 2018 Net operating income $ 13,731 $ 58,896 $ 85,609 Add (deduct): Depreciation and amortization ( 122,035 ) ( 133,597 ) ( 113,817 ) Land and other impairments ( 16,817 ) ( 32,444 ) ( 24,566 ) Property impairments ( 36,582 ) - - Gain on change of control of interests - 13,790 14,217 Realized gains (losses) and unrealized losses on disposition of rental property, net 5,481 343,102 99,436 Gain on disposition of developable land 5,787 522 30,939 Gain on sale from unconsolidated joint ventures 35,184 903 - Gain (loss) from extinguishment of debt, net ( 272 ) 1,648 ( 8,994 ) Income (loss) from continuing operations ( 115,523 ) 252,820 82,824 Discontinued operations Income from discontinued operations 70,724 24,366 23,577 Realized gains (losses) and unrealized losses on disposition of rental property and impairments, net 11,201 ( 133,350 ) - Total discontinued operations, net 81,925 ( 108,984 ) 23,577 Net income (loss) ( 33,598 ) 143,836 106,401 Noncontrolling interests in consolidated joint ventures 2,695 3,904 1,216 Redeemable noncontrolling interests ( 25,883 ) ( 22,615 ) ( 13,979 ) Net income (loss) available to common unitholders $ ( 56,786 ) $ 125,125 $ 93,638
Mack-Cali Realty LP [Member]
Segment Reporting Information [Line Items]
Segment Reporting	18. SEGMENT REPORTING The Company operates in two business segments: (i) commercial and other real estate and (ii) multi-family real estate and services. The Company provides leasing, property management, acquisition, development, construction and tenant-related services for its commercial and other real estate and multi-family real estate portfolio. The Company’s multi - family services business also provides similar services for third parties. The Company had no revenues from foreign countries recorded for the years ended December 31, 2020, 2019 and 2018. The Company had no long lived assets in foreign locations as of December 31, 2020 and 2019. The accounting policies of the segments are the same as those described in Note 2: Significant Accounting Policies, excluding depreciation and amortization. The Company evaluates performance based upon net operating income from the combined properties and operations in each of its real estate segments (commercial and other real estate, and multi-family real estate and services). All properties classified as discontinued operations have been excluded. Selected results of operations for the years ended December 31, 2020, 2019 and 2018, and selected asset information as of December 31, 2020 and 2019 regarding the Company’s operating segments are as follows. Amounts for prior periods have been restated to conform to the current period segment reporting presentation (dollars in thousands) : Commercial Multi-family Corporate Total & Other Real Estate Real Estate & Services (d) & Other (e) Company Total revenues: 2020 $ 155,045 $ 156,841 $ 1,676 $ 313,562 2019 184,966 170,833 1,403 357,202 2018 257,487 113,805 432 371,724 Total operating and interest expenses (a): 2020 $ 73,184 $ 95,631 $ 127,184 $ 295,999 2019 80,050 89,512 127,425 296,987 2018 116,912 70,279 98,797 285,988 Equity in earnings (loss) of unconsolidated joint ventures: Three months ended: 2020 $ ( 2,254 ) $ ( 1,578 ) $ - $ ( 3,832 ) 2019 ( 1,194 ) ( 125 ) - ( 1,319 ) 2018 2,319 ( 2,446 ) - ( 127 ) Net operating income (loss) (b): Three months ended: 2020 $ 79,607 $ 59,632 $ ( 125,508 ) $ 13,731 2019 103,722 81,196 ( 126,022 ) 58,896 2018 142,894 41,080 ( 98,365 ) 85,609 Total assets: 2020 $ 1,881,161 $ 3,249,516 $ 17,109 $ 5,147,786 2019 2,178,321 3,079,409 35,068 5,292,798 Total long-lived assets (c): 2020 $ 1,693,054 $ 3,035,485 $ ( 1,411 ) $ 4,727,128 2019 1,947,053 2,812,306 3,834 4,763,193 Total investments in unconsolidated joint ventures: 2020 $ 5,555 $ 156,827 $ - $ 162,382 2019 7,367 201,724 - 209,091 (a) Total operating and interest expenses represent the sum of: real estate taxes; utilities; operating services; real estate services expenses; general and administrative, acquisition-related costs and interest expense (net of interest income). All interest expense, net of interest and other investment income, (including for property-level mortgages) is excluded from segment amounts and classified in Corporate & Other for all periods. (b) Net operating income represents total revenues less total operating and interest expenses (as defined and classified in Note “a”), plus equity in earnings (loss) of unconsolidated joint ventures, for the period. (c) Long-lived assets are comprised of net investment in rental property, unbilled rents receivable and goodwill. (d) Segment assets and operations were owned through a consolidated variable interest entity commencing in February 2018, and which also include the Company’s consolidated hotel operations. (e) Corporate & Other represents all corporate-level items (including interest and other investment income, interest expense, non-property general and administrative expense), as well as intercompany eliminations necessary to reconcile to consolidated Company totals. Mack-Cali Realty Corporation The following schedule reconciles net operating income to net income available to common shareholders (dollars in thousands) : Year Ended December 31, 2020 2019 2018 Net operating income $ 13,731 $ 58,896 $ 85,609 Add (deduct): Depreciation and amortization ( 122,035 ) ( 133,597 ) ( 113,817 ) Land and other impairments ( 16,817 ) ( 32,444 ) ( 24,566 ) Property impairments ( 36,582 ) - - Gain on change of control of interests - 13,790 14,217 Realized gains (losses) and unrealized losses on disposition of rental property, net 5,481 343,102 99,436 Gain on disposition of developable land 5,787 522 30,939 Gain on sale from unconsolidated joint ventures 35,184 903 - Gain (loss) from extinguishment of debt, net ( 272 ) 1,648 ( 8,994 ) Income (loss) from continuing operations ( 115,523 ) 252,820 82,824 Discontinued operations Income from discontinued operations 70,724 24,366 23,577 Realized gains (losses) and unrealized losses on disposition of rental property and impairments, net 11,201 ( 133,350 ) - Total discontinued operations, net 81,925 ( 108,984 ) 23,577 Net income (loss) ( 33,598 ) 143,836 106,401 Noncontrolling interests in consolidated joint ventures 2,695 3,904 1,216 Noncontrolling interests in Operating Partnership 13,279 ( 23,720 ) ( 7,127 ) Noncontrolling interest in discontinued operations ( 7,880 ) 10,456 ( 2,400 ) Redeemable noncontrolling interests ( 25,883 ) ( 22,615 ) ( 13,979 ) Net income (loss) available to common shareholders $ ( 51,387 ) $ 111,861 $ 84,111 Mack-Cali Realty, L.P. The following schedule reconciles net operating income to net income available to common unitholders (dollars in thousands) : Year Ended December 31, 2020 2019 2018 Net operating income $ 13,731 $ 58,896 $ 85,609 Add (deduct): Depreciation and amortization ( 122,035 ) ( 133,597 ) ( 113,817 ) Land and other impairments ( 16,817 ) ( 32,444 ) ( 24,566 ) Property impairments ( 36,582 ) - - Gain on change of control of interests - 13,790 14,217 Realized gains (losses) and unrealized losses on disposition of rental property, net 5,481 343,102 99,436 Gain on disposition of developable land 5,787 522 30,939 Gain on sale from unconsolidated joint ventures 35,184 903 - Gain (loss) from extinguishment of debt, net ( 272 ) 1,648 ( 8,994 ) Income (loss) from continuing operations ( 115,523 ) 252,820 82,824 Discontinued operations Income from discontinued operations 70,724 24,366 23,577 Realized gains (losses) and unrealized losses on disposition of rental property and impairments, net 11,201 ( 133,350 ) - Total discontinued operations, net 81,925 ( 108,984 ) 23,577 Net income (loss) ( 33,598 ) 143,836 106,401 Noncontrolling interests in consolidated joint ventures 2,695 3,904 1,216 Redeemable noncontrolling interests ( 25,883 ) ( 22,615 ) ( 13,979 ) Net income (loss) available to common unitholders $ ( 56,786 ) $ 125,125 $ 93,638

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2020
Related Party Transactions	19. RELATED PARTY TRANSACTIONS William L. Mack, a former director of the General Partner, David S. Mack, a former director of the General Partner, and Earle I. Mack, a former director of the General Partner, are the executive officers, directors and stockholders of a corporation that leased 5,930 square feet at one of the Company’s office properties, which was scheduled to expire in January 2025 (the Company disposed of this property in March 2020). The corporation previously leased approximately 7,034 square feet at another one of the Company’s office properties (the Company disposed of this property in January 2019). The Company has recognized $ 48,000 , $ 18,000 and $ 193,000 in revenue under these leases for the years ended December 31, 2020, 2019 and 2018, respectively, and had no accounts receivable from the corporation as of December 31, 2020 and 2019. The adult children of Marshall Tycher, Chairman of RRT, own minority equity interests in a vendor to the Company. Additionally, Mr. Tycher’s son-in-law is an employee of the vendor. The Company recognized $ 99,000 , $ 120,000 and $ 148,000 in expense for this vendor during the years ended December 31, 2020, 2019 and 2018, respectively, and had no accounts payable to this vendor as of December 31, 2020 and 2019, respectively. Certain executive officers of RRT and/or their family members (“RG”) directly or indirectly hold small noncontrolling interests in a certain consolidated joint venture. Additionally, the Company earned zero , $ 674,000 , and $ 1,114,000 from entities in which RG has ownership interests for the years ended December 31, 2020, 2019 and 2018, respectively. In September 2020, the General Partner's Board of Directors approved a discretionary reimbursement of approximately $ 6.1 million in fees and expenses incurred by Bow Street LLC in connection with its proxy solicitations in 2019 and 2020 that resulted in the election of Bow Street's nominees as directors of the General Partner at the 2019 and 2020 annual meetings of stockholders of the General Partner. The Board of Directors determined that the reimbursement was appropriate in light of the benefit to the General Partner and its stockholders of the refreshment of the Board of Directors that resulted from the proxy contests. The Company intends to reimburse this amount to Bow Street in three substantially equal payments in November 2020, January 2021 and April 2021, which the Company has recorded the $ 6.1 million as general and administrative expense for the year ended December 31, 2020. Bow Street is an affiliate of A. Akiva Katz, a director of the General Partner, who is a co-founder and managing partner of Bow Street. Payments of $ 2.1 million were made to Bow Street in November 2020 and of $ 2.0 million in January 2021. $ 2.0 million is expected to be paid to it in April 2021.
Mack-Cali Realty LP [Member]
Related Party Transactions	19. RELATED PARTY TRANSACTIONS William L. Mack, a former director of the General Partner, David S. Mack, a former director of the General Partner, and Earle I. Mack, a former director of the General Partner, are the executive officers, directors and stockholders of a corporation that leased 5,930 square feet at one of the Company’s office properties, which was scheduled to expire in January 2025 (the Company disposed of this property in March 2020). The corporation previously leased approximately 7,034 square feet at another one of the Company’s office properties (the Company disposed of this property in January 2019). The Company has recognized $ 48,000 , $ 18,000 and $ 193,000 in revenue under these leases for the years ended December 31, 2020, 2019 and 2018, respectively, and had no accounts receivable from the corporation as of December 31, 2020 and 2019. The adult children of Marshall Tycher, Chairman of RRT, own minority equity interests in a vendor to the Company. Additionally, Mr. Tycher’s son-in-law is an employee of the vendor. The Company recognized $ 99,000 , $ 120,000 and $ 148,000 in expense for this vendor during the years ended December 31, 2020, 2019 and 2018, respectively, and had no accounts payable to this vendor as of December 31, 2020 and 2019, respectively. Certain executive officers of RRT and/or their family members (“RG”) directly or indirectly hold small noncontrolling interests in a certain consolidated joint venture. Additionally, the Company earned zero , $ 674,000 , and $ 1,114,000 from entities in which RG has ownership interests for the years ended December 31, 2020, 2019 and 2018, respectively. In September 2020, the General Partner's Board of Directors approved a discretionary reimbursement of approximately $ 6.1 million in fees and expenses incurred by Bow Street LLC in connection with its proxy solicitations in 2019 and 2020 that resulted in the election of Bow Street's nominees as directors of the General Partner at the 2019 and 2020 annual meetings of stockholders of the General Partner. The Board of Directors determined that the reimbursement was appropriate in light of the benefit to the General Partner and its stockholders of the refreshment of the Board of Directors that resulted from the proxy contests. The Company intends to reimburse this amount to Bow Street in three substantially equal payments in November 2020, January 2021 and April 2021, which the Company has recorded the $ 6.1 million as general and administrative expense for the year ended December 31, 2020. Bow Street is an affiliate of A. Akiva Katz, a director of the General Partner, who is a co-founder and managing partner of Bow Street. Payments of $ 2.1 million were made to Bow Street in November 2020 and of $ 2.0 million in January 2021. $ 2.0 million is expected to be paid to it in April 2021.

Condensed Quarterly Financial I

Condensed Quarterly Financial Information	12 Months Ended
	Dec. 31, 2020
Condensed Quarterly Financial Information	20. CONDENSED QUARTERLY FINANCIAL INFORMATION (unaudited) Mack-Cali Realty Corporation The following summarizes the condensed quarterly financial information for the Company (dollars in thousands) : Quarter Ended 2020 December 31 September 30 June 30 March 31 Total revenues $ 76,564 $ 79,197 $ 74,197 $ 83,604 Net income (loss) $ 78,298 $ ( 41,118 ) $ ( 32,934 ) $ ( 37,844 ) Net income (loss) available to common shareholders $ 65,632 $ ( 42,208 ) $ ( 34,887 ) $ ( 39,924 ) ` Basic earnings per common share: Income from continuing operations $ 0.22 $ ( 0.83 ) $ ( 0.50 ) $ ( 0.40 ) Discontinued operations 0.45 0.34 0.09 ( 0.07 ) Net income (loss) available to common shareholders $ 0.67 $ ( 0.49 ) $ ( 0.41 ) $ ( 0.47 ) Diluted earnings per common share: Income from continuing operations $ 0.22 $ ( 0.83 ) $ ( 0.50 ) $ ( 0.40 ) Discontinued operations 0.45 0.34 0.09 ( 0.07 ) Net income (loss) available to common shareholders $ 0.67 $ ( 0.49 ) $ ( 0.41 ) $ ( 0.47 ) Quarter Ended 2019 December 31 September 30 June 30 March 31 Total revenues $ 88,227 $ 89,038 $ 88,138 $ 91,799 Net income (loss) $ ( 55,408 ) $ ( 56,021 ) $ ( 20,329 ) $ 275,594 Net income (loss) available to common shareholders $ ( 54,652 ) $ ( 55,928 ) $ ( 22,054 ) $ 244,495 ` Basic earnings per common share: Income from continuing operations $ 0.51 $ ( 0.63 ) $ ( 0.44 ) $ 2.59 Discontinued operations ( 1.15 ) ( 0.02 ) 0.01 0.08 Net income (loss) available to common shareholders $ ( 0.64 ) $ ( 0.65 ) $ ( 0.43 ) $ 2.67 Diluted earnings per common share: Income from continuing operations $ 0.51 $ ( 0.63 ) $ ( 0.44 ) $ 2.58 Discontinued operations ( 1.15 ) ( 0.02 ) 0.01 0.08 Net income (loss) available to common shareholders $ ( 0.64 ) $ ( 0.65 ) $ ( 0.43 ) $ 2.66 Mack-Cali Realty, L.P. The following summarizes the condensed quarterly financial information for the Company (dollars in thousands) : Quarter Ended 2020 December 31 September 30 June 30 March 31 Total revenues $ 76,564 $ 79,197 $ 74,197 $ 83,604 Net income (loss) $ 78,298 $ ( 41,118 ) $ ( 32,934 ) $ ( 37,844 ) Net income (loss) available to common unitholders $ 72,623 $ ( 46,694 ) $ ( 38,576 ) $ ( 44,139 ) Basic earnings per common unit: Income from continuing operations $ 0.22 $ ( 0.83 ) $ ( 0.50 ) $ ( 0.40 ) Discontinued operations 0.45 0.34 0.09 ( 0.07 ) Net income (loss) available to common unitholders $ 0.67 $ ( 0.49 ) $ ( 0.41 ) $ ( 0.47 ) Diluted earnings per common units: Income from continuing operations $ 0.22 $ ( 0.83 ) $ ( 0.50 ) $ ( 0.40 ) Discontinued operations 0.45 0.34 0.09 ( 0.07 ) Net income (loss) available to common unitholders $ 0.67 $ ( 0.49 ) $ ( 0.41 ) $ ( 0.47 ) Quarter Ended 2019 December 31 September 30 June 30 March 31 Total revenues $ 88,227 $ 89,038 $ 88,138 $ 91,799 Net income (loss) $ ( 55,408 ) $ ( 56,021 ) $ ( 20,329 ) $ 275,594 Net income (loss) available to common unitholders $ ( 60,475 ) $ ( 62,087 ) $ ( 24,488 ) $ 272,175 Basic earnings per common unit: Income from continuing operations $ 0.51 $ ( 0.63 ) $ ( 0.44 ) $ 2.59 Discontinued operations ( 1.15 ) ( 0.02 ) 0.01 0.08 Net income (loss) available to common unitholders $ ( 0.64 ) $ ( 0.65 ) $ ( 0.43 ) $ 2.67 Diluted earnings per common unit: Income from continuing operations $ 0.51 $ ( 0.63 ) $ ( 0.44 ) $ 2.58 Discontinued operations ( 1.15 ) ( 0.02 ) 0.01 0.08 Net income (loss) available to common unitholders $ ( 0.64 ) $ ( 0.65 ) $ ( 0.43 ) $ 2.66
Mack-Cali Realty LP [Member]
Condensed Quarterly Financial Information	20. CONDENSED QUARTERLY FINANCIAL INFORMATION (unaudited) Mack-Cali Realty Corporation The following summarizes the condensed quarterly financial information for the Company (dollars in thousands) : Quarter Ended 2020 December 31 September 30 June 30 March 31 Total revenues $ 76,564 $ 79,197 $ 74,197 $ 83,604 Net income (loss) $ 78,298 $ ( 41,118 ) $ ( 32,934 ) $ ( 37,844 ) Net income (loss) available to common shareholders $ 65,632 $ ( 42,208 ) $ ( 34,887 ) $ ( 39,924 ) ` Basic earnings per common share: Income from continuing operations $ 0.22 $ ( 0.83 ) $ ( 0.50 ) $ ( 0.40 ) Discontinued operations 0.45 0.34 0.09 ( 0.07 ) Net income (loss) available to common shareholders $ 0.67 $ ( 0.49 ) $ ( 0.41 ) $ ( 0.47 ) Diluted earnings per common share: Income from continuing operations $ 0.22 $ ( 0.83 ) $ ( 0.50 ) $ ( 0.40 ) Discontinued operations 0.45 0.34 0.09 ( 0.07 ) Net income (loss) available to common shareholders $ 0.67 $ ( 0.49 ) $ ( 0.41 ) $ ( 0.47 ) Quarter Ended 2019 December 31 September 30 June 30 March 31 Total revenues $ 88,227 $ 89,038 $ 88,138 $ 91,799 Net income (loss) $ ( 55,408 ) $ ( 56,021 ) $ ( 20,329 ) $ 275,594 Net income (loss) available to common shareholders $ ( 54,652 ) $ ( 55,928 ) $ ( 22,054 ) $ 244,495 ` Basic earnings per common share: Income from continuing operations $ 0.51 $ ( 0.63 ) $ ( 0.44 ) $ 2.59 Discontinued operations ( 1.15 ) ( 0.02 ) 0.01 0.08 Net income (loss) available to common shareholders $ ( 0.64 ) $ ( 0.65 ) $ ( 0.43 ) $ 2.67 Diluted earnings per common share: Income from continuing operations $ 0.51 $ ( 0.63 ) $ ( 0.44 ) $ 2.58 Discontinued operations ( 1.15 ) ( 0.02 ) 0.01 0.08 Net income (loss) available to common shareholders $ ( 0.64 ) $ ( 0.65 ) $ ( 0.43 ) $ 2.66 Mack-Cali Realty, L.P. The following summarizes the condensed quarterly financial information for the Company (dollars in thousands) : Quarter Ended 2020 December 31 September 30 June 30 March 31 Total revenues $ 76,564 $ 79,197 $ 74,197 $ 83,604 Net income (loss) $ 78,298 $ ( 41,118 ) $ ( 32,934 ) $ ( 37,844 ) Net income (loss) available to common unitholders $ 72,623 $ ( 46,694 ) $ ( 38,576 ) $ ( 44,139 ) Basic earnings per common unit: Income from continuing operations $ 0.22 $ ( 0.83 ) $ ( 0.50 ) $ ( 0.40 ) Discontinued operations 0.45 0.34 0.09 ( 0.07 ) Net income (loss) available to common unitholders $ 0.67 $ ( 0.49 ) $ ( 0.41 ) $ ( 0.47 ) Diluted earnings per common units: Income from continuing operations $ 0.22 $ ( 0.83 ) $ ( 0.50 ) $ ( 0.40 ) Discontinued operations 0.45 0.34 0.09 ( 0.07 ) Net income (loss) available to common unitholders $ 0.67 $ ( 0.49 ) $ ( 0.41 ) $ ( 0.47 ) Quarter Ended 2019 December 31 September 30 June 30 March 31 Total revenues $ 88,227 $ 89,038 $ 88,138 $ 91,799 Net income (loss) $ ( 55,408 ) $ ( 56,021 ) $ ( 20,329 ) $ 275,594 Net income (loss) available to common unitholders $ ( 60,475 ) $ ( 62,087 ) $ ( 24,488 ) $ 272,175 Basic earnings per common unit: Income from continuing operations $ 0.51 $ ( 0.63 ) $ ( 0.44 ) $ 2.59 Discontinued operations ( 1.15 ) ( 0.02 ) 0.01 0.08 Net income (loss) available to common unitholders $ ( 0.64 ) $ ( 0.65 ) $ ( 0.43 ) $ 2.67 Diluted earnings per common unit: Income from continuing operations $ 0.51 $ ( 0.63 ) $ ( 0.44 ) $ 2.58 Discontinued operations ( 1.15 ) ( 0.02 ) 0.01 0.08 Net income (loss) available to common unitholders $ ( 0.64 ) $ ( 0.65 ) $ ( 0.43 ) $ 2.66

Real Estate Investments And Acc

Real Estate Investments And Accumulated Depreciation	12 Months Ended
	Dec. 31, 2020
Real Estate Investments And Accumulated Depreciation	P MACK-CALI REALTY CORPORATION, MACK-CALI REALTY, L.P. AND SUBSIDIARIES REAL ESTATE INVESTMENTS AND ACCUMULATED DEPRECIATION December 31, 2020 (dollars in thousands) SCHEDULE III Gross Amount at Which Costs Carried at Close of Initial Costs Capitalized Period (a) Property Year Related Building and Subsequent to Building and Accumulated Property Location Type Built Acquired Encumbrances Land Improvements Acquisition (d) Land Improvements Total (d) Depreciation (b) NEW JERSEY Essex County Millburn (Short Hills) 150 J.F. Kennedy Parkway Office 1980 1997 - 12,606 50,425 20,557 12,606 70,981 83,588 33,544 51 J.F. Kennedy Parkway Office 1988 2017 69,592 5,873 100,359 1,827 5,873 102,186 108,059 10,575 101 J.F. Kennedy Parkway Office 1981 2017 29,254 4,380 59,730 3,611 4,380 63,341 67,721 6,304 103 J.F. Kennedy Parkway Office 1981 2017 24,922 3,158 50,813 1,416 3,158 52,230 55,387 5,316 Hudson County Hoboken 111 River Street Office 2002 2016 148,752 - 198,609 21,683 - 220,292 220,292 27,079 Soho Lofts Multi-Family 2017 2019 158,993 27,601 224,039 2,603 27,601 226,642 254,243 11,832 Jersey City Harborside Plaza 2 Office 1990 1996 - 17,655 101,546 70,511 8,363 181,349 189,712 82,073 Harborside Plaza 3 Office 1990 1996 - 17,655 101,878 70,179 8,363 181,349 189,712 82,073 Harborside Plaza 4A Office 2000 2000 - 1,244 56,144 14,729 1,244 70,873 72,117 36,218 Harborside Plaza 5 Office 2002 2002 - 6,218 170,682 62,793 5,705 233,988 239,693 111,452 101 Hudson Street Office 1992 2005 248,857 45,530 271,376 48,131 45,530 319,507 365,037 121,970 Liberty Towers Multi-Family 2003 2019 263,484 66,670 328,347 3,434 66,670 331,782 398,451 10,792 BLVD 475 N/S Multi-Family 2011 2017 164,900 58,761 240,871 6,268 58,761 247,140 305,900 25,198 BLVD 425 Multi-Family 2003 2018 130,293 48,820 160,740 5,030 48,820 165,770 214,590 10,989 BLVD 401 Multi-Family 2016 2019 116,349 36,595 152,440 225 36,595 152,664 189,260 7,859 Weehawken 100 Avenue at Port Imperial Other 2016 2016 - 350 - 30,734 1,958 29,126 31,084 4,443 500 Avenue at Port Imperial Other 2013 2013 36,750 13,099 56,669 ( 19,362 ) 13,099 37,308 50,406 8,174 Port Imperial South 11 Multi-Family 2018 2018 99,834 22,047 - 112,052 22,047 112,051 134,099 7,428 Residence Inn/Envue Autograph Collection Other 2019 2015 93,481 23,660 - 81,362 18,059 86,963 105,022 9,171 West New York Port Imperial North Retail Other 2008 2020 - 4,305 8,216 695 4,305 8,911 13,216 369 Mercer County Princeton 100 Overlook Center Office 1988 1997 - 2,378 21,754 9,424 2,378 31,178 33,556 14,453 Middlesex County Edison 333 Thornall Street Office 1984 2015 - 5,542 40,762 6,770 5,542 47,533 53,074 5,994 343 Thornall Street Office 1991 2006 - 6,027 39,101 15,605 6,027 54,706 60,733 16,399 Iselin 99 Wood Avenue South Office 1987 2019 - 9,261 45,576 435 9,261 46,011 55,272 2,064 101 Wood Avenue South Office 1990 2016 - 8,509 72,738 1,111 7,384 74,973 82,358 9,342 Monmouth County Holmdel 23 Main Street Office 1977 2005 - 4,336 19,544 6,400 4,336 25,944 30,280 10,486 Middletown One River Center, Building 1 Office 1983 2004 - 3,070 17,414 17,290 2,451 35,323 37,774 9,762 One River Center, Building 2 Office 1983 2004 - 2,468 15,043 3,657 2,452 18,716 21,168 8,081 One River Center, Building 3 Office 1984 2004 - 4,051 24,790 7,660 4,627 31,874 36,501 12,478 Red Bank 100 Schultz Drive Office 1989 2017 - 1,953 6,790 3,932 1,953 10,722 12,675 949 200 Schultz Drive Office 1989 2017 - 2,184 8,259 3,528 2,184 11,787 13,971 1,477 MACK-CALI REALTY CORPORATION, MACK-CALI REALTY, L.P. AND SUBSIDIARIES REAL ESTATE INVESTMENTS AND ACCUMULATED DEPRECIATION December 31, 2020 (dollars in thousands) SCHEDULE III Gross Amount at Which Costs Carried at Close of Initial Costs Capitalized Period (a) Property Year Related Building and Subsequent to Building and Accumulated Property Location Type Built Acquired Encumbrances Land Improvements Acquisition (d) Land Improvements Total (d) Depreciation (b) Morris County Madison 7 Giralda Farms Office 1997 2017 - 5,402 37,664 1,295 5,402 38,959 44,361 4,251 Morris Plains Signature Place Multi-Family 2018 2018 42,656 930 - 56,410 930 56,410 57,340 4,403 Parsippany 4 Gatehall Drive Office 1988 2000 - 8,452 33,929 10,521 8,452 44,450 52,902 20,052 34 Sylvan Way Other 37,873 550 42,390 45,840 34,973 80,813 6,634 NEW YORK Westchester County Eastchester Quarry Place at Tuckahoe Multi-Family 2016 2016 40,565 5,585 3,400 48,934 5,585 52,334 57,919 6,148 MASSACHUSETTS Middlesex County Malden The Emery at Overlook Ridge Multi-Family 2020 2014 71,361 4,115 86,093 9,740 9,104 90,844 99,948 1,904 Suffolk County East Boston Portside at Pier One Multi-Family 2016 2016 58,801 - 73,713 634 - 74,347 74,347 - 11,523 Portside 5/6 Multi-Family 2018 2018 96,545 - 37,114 77,240 - 114,354 114,354 - 8,694 Worcester County Worcester 145 Front Street Multi-Family 2018 2015 62,574 4,380 - 92,148 4,380 92,148 96,528 7,695 Projects Under Development and Developable Land 246,180 282,423 811,274 - 282,423 811,274 1,093,697 49,717 Furniture, Fixtures and Equipment - - - 83,552 - 83,552 83,552 TOTALS 2,204,144 815,166 3,728,392 1,037,158 803,847 4,776,868 5,580,716 (e) 825,361 (f) (a) The aggregate cost for federal income tax purposes at December 31, 2020 was approximately $ 4.0 billion. (b) Depreciation of buildings and improvements are calculated over lives ranging from the life of the lease to 40 years. (c) This property is located on land leased by the Company. (d) These costs are net of impairments and valuation allowances recorded, if any. (e) Includes properties classified as held for sale at December 31, 2020. The gross amount includes $ 164.2 million of land and $ 779.9 million of building improvements related to these held for sale assets at period end. (f) Accumulated depreciation includes $ 169.0 million from assets classified as held for sale as of December 31, 2020. MACK-CALI REALTY CORPORATION/MACK-CALI REALTY, L.P. AND SUBSIDIARIES NOTE TO SCHEDULE III Changes in rental properties and accumulated depreciation for the periods ended December 31, 2020, 2019 and 2018 are as follows: (dollars in thousands) 2020 2019 2018 Rental Properties Balance at beginning of year $ 4,256,681 $ 5,306,017 $ 5,102,844 Additions 1,776,276 1,349,959 686,452 Real estate held for sale ( 944,082 ) ( 1,553,383 ) ( 184,233 ) Properties sold ( 443,755 ) ( 824,167 ) ( 238,873 ) Retirements/disposals ( 6,477 ) ( 21,745 ) ( 60,173 ) Balance at end of year $ 4,638,643 $ 4,256,681 $ 5,306,017 Accumulated Depreciation Balance at beginning of year $ 558,617 $ 1,097,868 $ 1,087,083 Depreciation expense 104,421 156,250 140,726 Real estate held for sale 2,238 ( 411,833 ) ( 30,404 ) Properties sold - ( 261,923 ) ( 39,364 ) Impairments ( 2,469 ) - - Retirements/disposals ( 6,477 ) ( 21,745 ) ( 60,173 ) Balance at end of year $ 656,331 $ 558,617 $ 1,097,868
Mack-Cali Realty LP [Member]
Real Estate Investments And Accumulated Depreciation	P MACK-CALI REALTY CORPORATION, MACK-CALI REALTY, L.P. AND SUBSIDIARIES REAL ESTATE INVESTMENTS AND ACCUMULATED DEPRECIATION December 31, 2020 (dollars in thousands) SCHEDULE III Gross Amount at Which Costs Carried at Close of Initial Costs Capitalized Period (a) Property Year Related Building and Subsequent to Building and Accumulated Property Location Type Built Acquired Encumbrances Land Improvements Acquisition (d) Land Improvements Total (d) Depreciation (b) NEW JERSEY Essex County Millburn (Short Hills) 150 J.F. Kennedy Parkway Office 1980 1997 - 12,606 50,425 20,557 12,606 70,981 83,588 33,544 51 J.F. Kennedy Parkway Office 1988 2017 69,592 5,873 100,359 1,827 5,873 102,186 108,059 10,575 101 J.F. Kennedy Parkway Office 1981 2017 29,254 4,380 59,730 3,611 4,380 63,341 67,721 6,304 103 J.F. Kennedy Parkway Office 1981 2017 24,922 3,158 50,813 1,416 3,158 52,230 55,387 5,316 Hudson County Hoboken 111 River Street Office 2002 2016 148,752 - 198,609 21,683 - 220,292 220,292 27,079 Soho Lofts Multi-Family 2017 2019 158,993 27,601 224,039 2,603 27,601 226,642 254,243 11,832 Jersey City Harborside Plaza 2 Office 1990 1996 - 17,655 101,546 70,511 8,363 181,349 189,712 82,073 Harborside Plaza 3 Office 1990 1996 - 17,655 101,878 70,179 8,363 181,349 189,712 82,073 Harborside Plaza 4A Office 2000 2000 - 1,244 56,144 14,729 1,244 70,873 72,117 36,218 Harborside Plaza 5 Office 2002 2002 - 6,218 170,682 62,793 5,705 233,988 239,693 111,452 101 Hudson Street Office 1992 2005 248,857 45,530 271,376 48,131 45,530 319,507 365,037 121,970 Liberty Towers Multi-Family 2003 2019 263,484 66,670 328,347 3,434 66,670 331,782 398,451 10,792 BLVD 475 N/S Multi-Family 2011 2017 164,900 58,761 240,871 6,268 58,761 247,140 305,900 25,198 BLVD 425 Multi-Family 2003 2018 130,293 48,820 160,740 5,030 48,820 165,770 214,590 10,989 BLVD 401 Multi-Family 2016 2019 116,349 36,595 152,440 225 36,595 152,664 189,260 7,859 Weehawken 100 Avenue at Port Imperial Other 2016 2016 - 350 - 30,734 1,958 29,126 31,084 4,443 500 Avenue at Port Imperial Other 2013 2013 36,750 13,099 56,669 ( 19,362 ) 13,099 37,308 50,406 8,174 Port Imperial South 11 Multi-Family 2018 2018 99,834 22,047 - 112,052 22,047 112,051 134,099 7,428 Residence Inn/Envue Autograph Collection Other 2019 2015 93,481 23,660 - 81,362 18,059 86,963 105,022 9,171 West New York Port Imperial North Retail Other 2008 2020 - 4,305 8,216 695 4,305 8,911 13,216 369 Mercer County Princeton 100 Overlook Center Office 1988 1997 - 2,378 21,754 9,424 2,378 31,178 33,556 14,453 Middlesex County Edison 333 Thornall Street Office 1984 2015 - 5,542 40,762 6,770 5,542 47,533 53,074 5,994 343 Thornall Street Office 1991 2006 - 6,027 39,101 15,605 6,027 54,706 60,733 16,399 Iselin 99 Wood Avenue South Office 1987 2019 - 9,261 45,576 435 9,261 46,011 55,272 2,064 101 Wood Avenue South Office 1990 2016 - 8,509 72,738 1,111 7,384 74,973 82,358 9,342 Monmouth County Holmdel 23 Main Street Office 1977 2005 - 4,336 19,544 6,400 4,336 25,944 30,280 10,486 Middletown One River Center, Building 1 Office 1983 2004 - 3,070 17,414 17,290 2,451 35,323 37,774 9,762 One River Center, Building 2 Office 1983 2004 - 2,468 15,043 3,657 2,452 18,716 21,168 8,081 One River Center, Building 3 Office 1984 2004 - 4,051 24,790 7,660 4,627 31,874 36,501 12,478 Red Bank 100 Schultz Drive Office 1989 2017 - 1,953 6,790 3,932 1,953 10,722 12,675 949 200 Schultz Drive Office 1989 2017 - 2,184 8,259 3,528 2,184 11,787 13,971 1,477 MACK-CALI REALTY CORPORATION, MACK-CALI REALTY, L.P. AND SUBSIDIARIES REAL ESTATE INVESTMENTS AND ACCUMULATED DEPRECIATION December 31, 2020 (dollars in thousands) SCHEDULE III Gross Amount at Which Costs Carried at Close of Initial Costs Capitalized Period (a) Property Year Related Building and Subsequent to Building and Accumulated Property Location Type Built Acquired Encumbrances Land Improvements Acquisition (d) Land Improvements Total (d) Depreciation (b) Morris County Madison 7 Giralda Farms Office 1997 2017 - 5,402 37,664 1,295 5,402 38,959 44,361 4,251 Morris Plains Signature Place Multi-Family 2018 2018 42,656 930 - 56,410 930 56,410 57,340 4,403 Parsippany 4 Gatehall Drive Office 1988 2000 - 8,452 33,929 10,521 8,452 44,450 52,902 20,052 34 Sylvan Way Other 37,873 550 42,390 45,840 34,973 80,813 6,634 NEW YORK Westchester County Eastchester Quarry Place at Tuckahoe Multi-Family 2016 2016 40,565 5,585 3,400 48,934 5,585 52,334 57,919 6,148 MASSACHUSETTS Middlesex County Malden The Emery at Overlook Ridge Multi-Family 2020 2014 71,361 4,115 86,093 9,740 9,104 90,844 99,948 1,904 Suffolk County East Boston Portside at Pier One Multi-Family 2016 2016 58,801 - 73,713 634 - 74,347 74,347 - 11,523 Portside 5/6 Multi-Family 2018 2018 96,545 - 37,114 77,240 - 114,354 114,354 - 8,694 Worcester County Worcester 145 Front Street Multi-Family 2018 2015 62,574 4,380 - 92,148 4,380 92,148 96,528 7,695 Projects Under Development and Developable Land 246,180 282,423 811,274 - 282,423 811,274 1,093,697 49,717 Furniture, Fixtures and Equipment - - - 83,552 - 83,552 83,552 TOTALS 2,204,144 815,166 3,728,392 1,037,158 803,847 4,776,868 5,580,716 (e) 825,361 (f) (a) The aggregate cost for federal income tax purposes at December 31, 2020 was approximately $ 4.0 billion. (b) Depreciation of buildings and improvements are calculated over lives ranging from the life of the lease to 40 years. (c) This property is located on land leased by the Company. (d) These costs are net of impairments and valuation allowances recorded, if any. (e) Includes properties classified as held for sale at December 31, 2020. The gross amount includes $ 164.2 million of land and $ 779.9 million of building improvements related to these held for sale assets at period end. (f) Accumulated depreciation includes $ 169.0 million from assets classified as held for sale as of December 31, 2020. MACK-CALI REALTY CORPORATION/MACK-CALI REALTY, L.P. AND SUBSIDIARIES NOTE TO SCHEDULE III Changes in rental properties and accumulated depreciation for the periods ended December 31, 2020, 2019 and 2018 are as follows: (dollars in thousands) 2020 2019 2018 Rental Properties Balance at beginning of year $ 4,256,681 $ 5,306,017 $ 5,102,844 Additions 1,776,276 1,349,959 686,452 Real estate held for sale ( 944,082 ) ( 1,553,383 ) ( 184,233 ) Properties sold ( 443,755 ) ( 824,167 ) ( 238,873 ) Retirements/disposals ( 6,477 ) ( 21,745 ) ( 60,173 ) Balance at end of year $ 4,638,643 $ 4,256,681 $ 5,306,017 Accumulated Depreciation Balance at beginning of year $ 558,617 $ 1,097,868 $ 1,087,083 Depreciation expense 104,421 156,250 140,726 Real estate held for sale 2,238 ( 411,833 ) ( 30,404 ) Properties sold - ( 261,923 ) ( 39,364 ) Impairments ( 2,469 ) - - Retirements/disposals ( 6,477 ) ( 21,745 ) ( 60,173 ) Balance at end of year $ 656,331 $ 558,617 $ 1,097,868

Significant Accounting Polici_2

Significant Accounting Policies (Policy)	12 Months Ended
	Dec. 31, 2020
Significant Accounting Policies [Line Items]
Rental Property	Rental Property Rental properties are stated at cost less accumulated depreciation and amortization. Costs directly related to the acquisition, development and construction of rental properties are capitalized. The Company adopted Financial Accounting Standards Board (“FASB”) guidance Accounting Standards Update (“ASU”) 2017-01 on January 1, 2017, which revises the definition of a business and is expected to result in more transactions to be accounted for as asset acquisitions and significantly limit transactions that would be accounted for as business combinations. Where an acquisition has been determined to be an asset acquisition, acquisition-related costs are capitalized. Capitalized development and construction costs include pre-construction costs essential to the development of the property, development and construction costs, interest, property taxes, insurance, salaries and other project costs incurred during the period of development. Capitalized development and construction salaries and related costs approximated $ 2.0 million, $ 2.1 million and $ 2.3 million for the years ended December 31, 2020, 2019 and 2018, respectively. Ordinary repairs and maintenance are expensed as incurred; major replacements and betterments, which improve or extend the life of the asset, are capitalized and depreciated over their estimated useful lives. Fully-depreciated assets are removed from the accounts. Included in net investment in rental property as of December 31, 2020 and 2019 is real estate and building and tenant improvements not in service; as follows (dollars in thousands) : December 31, December 31, 2020 2019 Land held for development (including pre-development costs, if any) (a)(c) $ 364,946 $ 388,702 Development and construction in progress, including land (b)(d) 733,560 464,110 Total $ 1,098,506 $ 852,812 (a) Includes predevelopment and infrastructure costs included in buildings and improvements of $ 160.3 million and $ 156.5 million as of December 31, 2020 and December 31, 2019, respectively. (b) Includes land of $ 74.9 million and $ 96.6 million as of December 31, 2020 and December 31, 2019, respectively. (c) Includes $ 31.9 million of land and $ 8.9 million of building and improvements pertaining to assets held for sale at December 31, 2020. The Company considers a construction project as substantially completed and held available for occupancy upon the substantial completion of improvements, but no later than one year from cessation of major construction activity (as distinguished from activities such as routine maintenance and cleanup). If portions of a rental project are substantially completed and occupied by tenants or residents, or held available for occupancy, and other portions have not yet reached that stage, the substantially completed portions are accounted for as a separate project. The Company allocates costs incurred between the portions under construction and the portions substantially completed and held available for occupancy, primarily based on a percentage of the relative commercial square footage or multi-family units of each portion, and capitalizes only those costs associated with the portion under construction. Properties are depreciated using the straight-line method over the estimated useful lives of the assets. The estimated useful lives are as follows: Leasehold interests Remaining lease term Buildings and improvements 5 to 40 years Tenant improvements The shorter of the term of the related lease or useful life Furniture, fixtures and equipment 5 to 10 years Upon acquisition of rental property, the Company estimates the fair value of acquired tangible assets, consisting of land, building and improvements, and identified intangible assets and liabilities assumed, generally consisting of the fair value of (i) above and below-market leases, (ii) in-place leases and (iii) tenant relationships. For asset acquisitions, the Company allocates the purchase price to the assets acquired and liabilities assumed based on their relative fair values. The Company records goodwill or a gain on bargain purchase (if any) if the net assets acquired/liabilities assumed differ from the purchase consideration of a business combination transaction. In estimating the fair value of the tangible and intangible assets acquired, the Company considers information obtained about each property as a result of its due diligence and marketing and leasing activities, and utilizes various valuation methods, such as estimated cash flow projections utilizing appropriate discount and capitalization rates, estimates of replacement costs net of depreciation, and available market information. The fair value of the tangible assets of an acquired property considers the value of the property as if it were vacant. Above-market and below-market lease values for acquired properties are initially recorded based on the present value (using a discount rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to each in-place lease and (ii) management’s estimate of fair market lease rates for each corresponding in-place lease, measured over a period equal to the remaining term of the lease for above-market leases and the remaining initial term plus the term of any below-market fixed rate renewal options for below-market leases. The capitalized above-market lease values are amortized as a reduction of base rental revenue over the remaining terms of the respective leases, and the capitalized below-market lease values are amortized as an increase to base rental revenue over the remaining initial terms plus the terms of any below-market fixed rate renewal options of the respective leases. Other intangible assets acquired include amounts for in-place lease values and tenant relationship values, which are based on management’s evaluation of the specific characteristics of each tenant’s lease and the Company’s overall relationship with the respective tenant. Factors to be considered by management in its analysis of in-place lease values include an estimate of carrying costs during hypothetical expected lease-up periods considering current market conditions, and costs to execute similar leases. In estimating carrying costs, management includes real estate taxes, insurance and other operating expenses and estimates of lost rentals at market rates during the expected lease-up periods, depending on local market conditions. In estimating costs to execute similar leases, management considers leasing commissions, legal and other related expenses. Characteristics considered by management in valuing tenant relationships include the nature and extent of the Company’s existing business relationships with the tenant, growth prospects for developing new business with the tenant, the tenant’s credit quality and expectations of lease renewals. The values of in-place leases are amortized to expense over the remaining initial terms of the respective leases. The values of tenant relationship intangibles are amortized to expense over the anticipated life of the relationships or leases. On a periodic basis, management assesses whether there are any indicators that the value of the Company’s rental properties held for use may be impaired. In addition to identifying any specific circumstances which may affect a property or properties, management considers other criteria for determining which properties may require assessment for potential impairment. The criteria considered by management, depending on the type of property, may include reviewing low leased percentages, significant near-term lease expirations, current and historical operating and/or cash flow losses, construction cost overruns and/or other factors, including those that might impact the Company’s intent and ability to hold the property. A property’s value is impaired only if management’s estimate of the aggregate future cash flows (undiscounted and without interest charges) to be generated by the property over its estimated holding period is less than the carrying value of the property. If there are different possible scenarios for a property, the Company will take a probability weighted approach to estimating future cash flow scenarios. To the extent impairment has occurred, the impairment loss is measured as the excess of the carrying value of the property over the fair value of the property. The Company’s estimates of aggregate future cash flows expected to be generated and estimated fair values for each property are based on a number of assumptions, including but not limited to estimated holding periods, market capitalization rates and discount rates, if applicable. For developable land holdings, an estimated per-unit market value assumption is also considered based on development rights for the land. These assumptions are generally based on management’s experience in its local real estate markets and the effects of current market conditions. The assumptions are subject to economic and market uncertainties including, among others, demand for space, competition for tenants, changes in market rental rates, food, beverage and lodging demands, and costs to operate each property. As these factors are difficult to predict and are subject to future events that may alter management’s assumptions, the future cash flows estimated by management in its impairment analyses may not be achieved, and actual losses or impairments may be realized in the future.
Real Estate Held For Sale And Discontinued Operations	Real Estate Held for Sale and Discontinued Operations When assets are identified by management as held for sale, the Company discontinues depreciating the assets and estimates the sales price, net of expected selling costs, of such assets. The Company generally considers assets (as identified by their disposal groups) to be held for sale when the transaction has received appropriate corporate authority, it is probable to be sold within the following 12 months, and there are no significant contingencies relating to a sale. If, in management’s opinion, the estimated net sales price, net of expected selling costs, of the disposal groups which have been identified as held for sale is less than the carrying value of the assets, a valuation allowance (which is recorded as unrealized losses on disposition of rental property) is established. In the absence of an executed sales agreement with a set sales price, management’s estimate of the net sales price may be based on a number of assumptions, including but not limited to the Company’s estimates of future cash flows, market capitalization rates and discount rates, if applicable. For developable land holdings, an estimated per-unit market value assumption is also considered based on development rights for the land. In addition, the Company classifies assets held for sale or sold as discontinued operations if the disposal groups represent a strategic shift that will have a major effect on the Company’s operations and financial results. For any disposals qualifying as discontinued operations, the assets and their results are presented in discontinued operations in the financial statements for all periods presented. See Note 7: Discontinued Operations. If circumstances arise that previously were considered unlikely and, as a result, the Company has determined that an asset previously classified as held for sale, no longer meets the held for sale criteria, the asset is reclassified as held and used. An asset that is reclassified is measured and recorded individually at the lower of (a) its carrying value before the asset was classified as held for sale, adjusted for any depreciation (amortization) expense that would have been recognized had the asset been continuously classified as held and used, or (b) the fair value at the date the asset qualified as held for sale.
Investments In Unconsolidated Joint Ventures	Investments in Unconsolidated Joint Ventures The Company accounts for its investments in unconsolidated joint ventures under the equity method of accounting. The Company applies the equity method by initially recording these investments at cost, as Investments in Unconsolidated Joint Ventures, subsequently adjusted for equity in earnings and cash contributions and distributions. The outside basis portion of the Company’s joint ventures is amortized over the anticipated useful lives of the underlying ventures’ tangible and intangible assets acquired and liabilities assumed. Generally, the Company would discontinue applying the equity method when the investment (and any advances) is reduced to zero and would not provide for additional losses unless the Company has guaranteed obligations of the venture or is otherwise committed to providing further financial support for the investee. If the venture subsequently generates income, the Company only recognizes its share of such income to the extent it exceeds its share of previously unrecognized losses. If the venture subsequently makes distributions and the Company does not have an implied or actual commitment to support the operations of the venture, the Company will not record a basis less than zero, rather such amounts will be recorded as equity in earnings of unconsolidated joint ventures. On a periodic basis, management assesses whether there are any indicators that the value of the Company’s investments in unconsolidated joint ventures may be impaired. An investment is impaired only if management’s estimate of the value of the investment is less than the carrying value of the investment, and such decline in value is deemed to be other than temporary. To the extent impairment has occurred, the loss shall be measured as the excess of the carrying value of the investment over the value of the investment. The Company’s estimates of value for each investment (particularly in real estate joint ventures) are based on a number of assumptions including but not limited to estimates of future cash flows, market capitalization rates and discount rates, if applicable. These assumptions are based on management's experience in its local real estate markets and the effects of current market conditions. The assumptions are subject to economic and market uncertainties including, among others, demand for space, competition for tenants, changes in market rental rates, and operating costs. As these factors are difficult to predict and are subject to future events that may alter management’s assumptions, the values estimated by management in its impairment analyses may not be realized, and actual losses or impairment may be realized in the future. See Note 4: Investments in Unconsolidated Joint Ventures.
Cash And Cash Equivalents	Cash and Cash Equivalents All highly liquid investments with an original maturity of three months or less when purchased are considered to be cash equivalents.
Deferred Financing Costs	Deferred Financing Costs Costs incurred in obtaining financing are capitalized and amortized over the term of the related indebtedness. Deferred financing costs are presented in the balance sheet as a direct deduction from the carrying value of the debt liability to which they relate, except deferred financing costs related to the revolving credit facility, which are presented in deferred charges, goodwill and other assets. In all cases, amortization of such costs is included in interest expense and was $ 4,625,000 , $ 4,625,000 and $ 5,028,000 for the years ended December 31, 2020, 2019 and 2018, respectively. If a financing obligation is extinguished early, any unamortized deferred financing costs are written off and included in gains (losses) from extinguishment of debt. Included in the gains(losses) from extinguishment of debt, net, of $( 0.3 ) million, $ 1.6 million and $( 10.8 ) million (of which $ 1.8 million loss pertained to properties classified as discontinued operations) for the years ended December 31, 2020, 2019 and 2018 were unamortized deferred financing costs which were written off (as non-cash transactions) amounting to zero , $ 0.4 million and $ 0.6 million, respectively.
Deferred Leasing Costs/Leasing Personnel Costs	Deferred Leasing Costs/Leasing Personnel Costs Costs incurred in connection with successfully executed commercial and residential leases were capitalized and amortized on a straight-line basis over the terms of the related leases and included in depreciation and amortization. Unamortized deferred leasing costs were charged to amortization expense upon early termination of the lease. Certain employees of the Company are compensated for providing leasing services to the Properties. The portion of such compensation related to commercial leases, which was capitalized and amortized, and included in deferred charges, goodwill and other assets, net, was approximately $ 3,463,000 for the year ended December 31, 2018. Upon the adoption of ASC 842 on January 1, 2019, the Company no longer capitalizes such costs, and includes such leasing personnel costs in General and Administrative expense costs in the Company’s Consolidated Statements of Operations, which amounted to $ 1,483,000 and $ 2,261,000 (excluding any severance – related costs) for the years ended December 31, 2020 and 2019, respectively.
Goodwill	Goodwill Goodwill represents the excess of the purchase price over the fair value of net tangible and intangible assets acquired in a business combination. Goodwill is allocated to various reporting units, as applicable. Each of the Company’s segments consists of a reporting unit. Goodwill is not amortized. Management performs an annual impairment test for goodwill during the fourth quarter and between annual tests, management evaluates the recoverability of goodwill whenever events or changes in circumstances indicate that the carrying value of goodwill may not be fully recoverable. In its impairment tests of goodwill, management first assesses qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying value. If, based on this assessment, management determines that the fair value of the reporting unit is not less than its carrying value, then performing the additional two-step impairment test is unnecessary. If the carrying value of goodwill exceeds its fair value, an impairment charge is recognized. The Company determined that its goodwill, with a balance of $ 2.9 million, was no t impaired at December 31, 2020 after management performed its impairment tests.
Derivative Instruments	Derivative Instruments The Company measures derivative instruments, including certain derivative instruments embedded in other contracts, at fair value and records them as an asset or liability, depending on the Company’s rights or obligations under the applicable derivative contract. For derivatives designated and qualifying as fair value hedges, the changes in the fair value of both the derivative instrument and the hedged item are recorded in earnings. For derivatives designated as cash flow hedges, the effective portions of the derivative are reported in other comprehensive income (“OCI”) and are subsequently reclassified into earnings when the hedged item affects earnings. Changes in fair value of derivative instruments not designated as hedging and ineffective portions of hedges are recognized in earnings in the affected period.
Revenue Recognition	Revenue Recognition Revenue from leases includes fixed base rents under leases, which are recognized on a straight-line basis over the terms of the respective leases. Unbilled rents receivable represents the cumulative amount by which straight-line rental revenue exceeds rents currently billed in accordance with the lease agreements. Above-market and below-market lease values for acquired properties are initially recorded based on the present value (using a discount rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to each in-place lease and (ii) management’s estimate of fair market lease rates for each corresponding in-place lease, measured over a period equal to the remaining term of the lease for above-market leases and the remaining initial term plus the term of any below-market fixed-rate renewal options for below-market leases. The capitalized above-market lease values for acquired properties are amortized as a reduction of revenue from leases over the remaining terms of the respective leases, and the capitalized below-market lease values are amortized as an increase to revenue from leases over the remaining initial terms plus the terms of any below-market fixed-rate renewal options of the respective leases. The Company elected a practical expedient for its rental properties (as lessor) to avoid separating non-lease components that otherwise would need to be accounted for under the recently-adopted revenue accounting guidance (such as tenant reimbursements of property operating expenses) from the associated lease component since (1) the non-lease components have the same timing and pattern of transfer as the associated lease component and (2) the lease component, if accounted for separately, would be classified as an operating lease; this enables the Company to account for the combination of the lease component and non-lease components as an operating lease since the lease component is the predominant component of the combined components. Due to the Company’s adoption of the practical expedient discussed above to not separate non-lease component revenue from the associated lease component, the Company is aggregating revenue from its lease components and non-lease components (comprised predominantly of tenant operating expense reimbursements) into the line entitled “Revenue from leases.” Revenue from leases also includes reimbursements and recoveries from tenants received from tenants for certain costs as provided in the lease agreements. These costs generally include real estate taxes, utilities, insurance, common area maintenance and other recoverable costs. See Note 14: Tenant Leases. Real estate services revenue includes property management, development, construction and leasing commission fees and other services, and payroll and related costs reimbursed from clients. Fee income derived from the Company’s unconsolidated joint ventures (which are capitalized by such ventures) are recognized to the extent attributable to the unaffiliated ownership interests. Parking income is comprised of income from parking spaces leased to tenants and others. Hotel income includes all revenue generated from hotel properties. Other income includes income from tenants for additional services arranged for by the Company and income from tenants for early lease terminations. All bad debt expense is being recorded as a reduction of the corresponding revenue account starting on January 1, 2019. Management performs a detailed review of amounts due from tenants for collectability, based on factors affecting the billings and status of individual tenants. The factors considered by management in determining which individual tenant’s revenues are affected include the age of the receivable, the tenant’s payment history, the nature of the charges, any communications regarding the charges and other related information. Management’s estimate of bad debt write-off’s requires management to exercise judgment about the timing, frequency and severity of collection losses, which affects the revenue recorded.
Income And Other Taxes	Income and Other Taxes The General Partner has elected to be taxed as a REIT under Sections 856 through 860 of the Internal Revenue Code of 1986, as amended (the “IRS Code”). As a REIT, the General Partner generally will not be subject to corporate federal income tax on net income that it currently distributes to its shareholders, provided that the General Partner satisfies certain organizational and operational requirements including the requirement to distribute at least 90 percent of its REIT taxable income (determined by excluding any net capital gains) to its shareholders. If and to the extent the General Partner retains and does not distribute any net capital gains, the General Partner will be required to pay federal, state and local taxes, as applicable, on such net capital gains at the rate applicable to capital gains of a corporation. The Operating Partnership is a partnership, and, as a result, all income and losses of the partnership are allocated to the partners for inclusion in their respective tax returns. Accordingly, no provision or benefit for income taxes has been made in the accompanying financial statements. As of December 31, 2020, the estimated net basis of the rental property for federal income tax purposes was lower than the net assets as reported in the Operating Partnership’s financial statements by approximately $ 669,239,000 . The Operating Partnership’s taxable income for the years ended December 31, 2020, 2019 and 2018 was estimated to be approximately $ 79,293,000 , $ 71,151,000 and $ 82,106,000 , respectively. The differences between book income and taxable income primarily result from differences in depreciation expenses, the recording of rental income, differences in the deductibility of interest expense and certain other expenses for tax purposes, differences in revenue recognition and the rules for tax purposes of a property exchange. The General Partner has elected to treat certain of its corporate subsidiaries as taxable REIT subsidiaries (each a “TRS”). In general, a TRS of the General Partner may perform additional services for tenants of the Company and generally may engage in any real estate or non-real estate related business (except for the operation or management of health care facilities or lodging facilities or the providing to any person, under a franchise, license or otherwise, rights to any brand name under which any lodging facility or health care facility is operated). A TRS is subject to corporate federal income tax. The General Partner has conducted business through its TRS entities for certain property management, development, construction and other related services, as well as to hold a joint venture interest in a hotel and other matters. The deferred tax asset balance at December 31, 2020 amounted to $ 16.2 million which has been fully reserved through a valuation allowance. New tax reform legislation enacted in late 2017 reduced the corporate tax rate to 21 percent, effective January 1, 2018. Consequently, the Company’s deferred tax assets were re-measured to reflect the reduction in the future U.S. corporate income tax rate as of the enactment date. As a result, the Company recorded a decrease related to its deferred tax assets of $ 5.3 million and a decrease to the associated valuation allowance of $ 5.3 million at December 31, 2017. If the General Partner fails to qualify as a REIT in any taxable year, the Company will be subject to federal income tax on its taxable income at regular corporate tax rates. The Company is subject to certain state and local taxes. Pursuant to the amended provisions related to uncertain tax provisions of ASC 740, Income Taxes, the Company recognized no material adjustments regarding its tax accounting treatment. The Company expects to recognize interest and penalties related to uncertain tax positions, if any, as income tax expense, which is included in general and administrative expense. In the normal course of business, the Company or one of its subsidiaries is subject to examination by federal, state and local jurisdictions in which it operates, where applicable. As of December 31, 2020, the tax years that remain subject to examination by the major tax jurisdictions under the statute of limitations are generally from the year 2016 forward.
Earnings Per Share Or Unit	Earnings Per Share or Unit The Company presents both basic and diluted earnings per share or unit (“EPS or EPU”). Basic EPS or EPU excludes dilution and is computed by dividing net income available to common shareholders or unitholders by the weighted average number of shares or units outstanding for the period. Diluted EPS or EPU reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock, where such exercise or conversion would result in a lower EPS or EPU from continuing operations amount. Shares or units whose issuance is contingent upon the satisfaction of certain conditions shall be considered outstanding and included in the computation of diluted EPS or EPU as follows (i) if all necessary conditions have been satisfied by the end of the period (the events have occurred), those shares or units shall be included as of the beginning of the period in which the conditions were satisfied (or as of the date of the grant, if later) or (ii) if all necessary conditions have not been satisfied by the end of the period, the number of contingently issuable shares or units included in diluted EPS or EPU shall be based on the number of shares or units, if any, that would be issuable if the end of the reporting period were the end of the contingency period (for example, the number of shares or units that would be issuable based on current period earnings or period-end market price) and if the result would be dilutive. Those contingently issuable shares or units shall be included in the denominator of diluted EPS or EPU as of the beginning of the period (or as of the date of the grant, if later).
Dividends And Distributions Payable	Dividends and Distributions Payable On September 30, 2020, the Company announced that its Board of Directors was suspending its common dividends and distributions attributable to the third and fourth quarters 2020. As the Company’s management estimated that as of September 2020 it had satisfied its dividends obligations as a REIT on taxable income expected for 2020, the Board made the strategic decision to suspend its common dividends and distributions for the remainder of 2020 in an effort to provide greater financial flexibility during the pandemic and to retain incremental capital to support leasing initiatives at its Harborside commercial office properties on the Jersey City waterfront. The dividends and distributions payable at December 31, 2020 represent amounts payable on unvested LTIP units. The dividends and distributions payable at December 31, 2019 represents dividends payable to common shareholders ( 90,595,197 shares) and distributions payable to noncontrolling interests unitholders of the Operating Partnership ( 9,488,794 common units and 1,949,601 vested and unvested LTIP units) for all such holders of record as of January 3, 2020 with respect to the fourth quarter 2019. The fourth quarter 2019 common stock dividends and unit distributions of $ 0.20 per common share (total of $ 18.1 million), common unit (total of $ 1.9 million) and LTIP unit (total of $ 0.4 million) were approved by the General Partner’s Board of Directors on December 17, 2019 and paid on January 10, 2020 . The Company has determined that the $ 0.60 dividend per common share paid during the year ended December 31, 2020 represented approximately 19 percent ordinary income and approximately 81 percent capital gain; the $ 0.80 dividend per common share paid during the year ended December 31, 2019 represented 100 percent capital gain and the $ 0.80 dividend per common share paid during the year ended December 31, 2018 represented approximately 47 percent ordinary income and approximately 53 percent capital gain.
Costs Incurred For Stock Issuances	Costs Incurred For Stock Issuances Costs incurred in connection with the Company’s stock issuances are reflected as a reduction of additional paid - in capital.
Stock Compensation	Stock Compensation The Company accounts for stock compensation in accordance with the provisions of ASC 718, Compensation-Stock Compensation. These provisions require that the estimated fair value of restricted stock (“Restricted Stock Awards”), performance share units, long term incentive plan awards and stock options at the grant date be amortized ratably into expense over the appropriate vesting period. For unvested securities that are forfeited prior to the measurement period being complete, the Company elected to account for forfeiture of employee awards as they occur. The Company recorded stock compensation expense of $ 7,635,000 , $ 8,161,000 and $ 6,894,000 for the years ended December 31, 2020, 2019 and 2018, respectively.
Other Comprehensive Income (Loss)	Other Comprehensive Income (Loss) Other comprehensive income (loss) includes items that are recorded in equity, such as effective portions of derivatives designated as cash flow hedges or unrealized holding gains or losses on marketable securities available for sale.
Redeemable Noncontrolling Interests	Redeemable Noncontrolling Interests The Company evaluates the terms of the partnership units issued in accordance with the FASB’s Distinguishing Liabilities from Equity guidance. Units which embody an unconditional obligation requiring the Company to redeem the units for cash after a specified or determinable date (or dates) or upon the occurrence of an event that is not solely within the control of the issuer are determined to be contingently redeemable under this guidance and are included as Redeemable noncontrolling interests and classified within the mezzanine section between Total liabilities and Stockholders’ equity on the Company’s Consolidated Balance Sheets. The carrying amount of the redeemable noncontrolling interests will be changed by periodic accretions, so that the carrying amount will equal the estimated future redemption value at the redemption date.
Fair Value Hierarchy	Fair Value Hierarchy The standard Fair Value Measurements specifies a hierarchy of valuation techniques based upon whether the inputs to those valuation techniques reflect assumptions other market participants would use based upon market data obtained from independent sources (observable inputs). The following summarizes the fair value hierarchy:  Level 1: Quoted prices in active markets that are unadjusted and accessible at the measurement date for identical, unrestricted assets or liabilities;  Level 2: Quoted prices for identical assets and liabilities in markets that are inactive, quoted prices for similar assets and liabilities in active markets or financial instruments for which significant inputs are observable, either directly or indirectly, such as interest rates and yield curves that are observable at commonly quoted intervals and  Level 3: Prices or valuations that require inputs that are both significant to the fair value measurement and unobservable. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, the level in the fair value hierarchy within which the fair value measurement in its entirety falls has been determined based on the lowest level input that is significant to the fair value measurement in its entirety. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability.
Impact Of Recently-Issued Accounting Standards	Impact of Recently-Issued Accounting Standards In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses (“ASU 2016-13”). The guidance introduces a new model for estimating credit losses for certain types of financial instruments, including trade and lease receivables, loans receivable, held-to-maturity debt securities, and net investments in direct financing leases, amongst other financial instruments. ASU 2016-13 also modifies the impairment model for available-for-sale debt securities and expands the disclosure requirements regarding an entity’s assumptions, models, and methods for estimating the allowance for losses. ASU 2016-13 is effective for annual reporting periods beginning after December 15, 2019, including interim periods within those fiscal years, with early adoption permitted. The adoption of ASU 2016-13 did not have a material impact on the Company’s consolidated financial statements. In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities (“ASU 2017-12”). The purpose of ASU 2017-12 is to better align a company’s financial reporting for hedging activities with the economic objectives of those activities. The Company has adopted ASU 2017-12 on January 1, 2019. ASU 2017-12 requires a modified retrospective transition method which requires a cumulative effect of the change on the opening balance of each affected component of equity in the Company’s consolidated financial statements as of the date of adoption. Upon adoption, the Company recorded a cumulative adjustment specifically related to the elimination of the requirement for separate measurement of hedge ineffectiveness. As a result, the Company recorded an opening balance adjustment as of January 1, 2019 to dividends in excess of net earnings of $ 0.4 million with a corresponding change to accumulated other comprehensive income (loss). In March 2020, the FASB issued ASU 2020-04 Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Rate Reform on Financial Reporting. The amendments provide practical expedients for reference rate reform related activities that impact debt, leases, derivatives and other contracts. The guidance is optional and is effective between March 12, 2020 and December 31, 2022. The guidance may be elected over time as reference rate reform activities occur. The Company is currently in the process of evaluating the impact the adoption of ASU 2020-04 will have on the Company’s consolidated financial statements. In April 2020, the FASB issued a Staff Question-and-Answer (“Q&A”) to clarify whether lease concessions related to the effects of COVID-19 require the application of the lease modification guidance under the new lease standard, which was adopted on January 1, 2019. Under the new leasing standard, an entity would have to determine, on a lease by lease basis, if a lease concession was the result of a new arrangement reached with the tenant, which would be accounted for under the lease modification framework, or if the lease concession was under the enforceable rights and obligations that existed in the original lease, which would be accounted for outside the lease modification framework. The Q&A provides entities with the option to elect to account for lease concessions as though the enforceable rights and obligations existed in the original lease as long as the total cash flows from the modified lease are substantially similar to the cash flows in the original lease. The Company elected this option and therefore, to the extent that rent concession is granted as a deferral of payments but total payments are substantially the same, will account for the concession as if no change has been made to the original lease.
Mack-Cali Realty LP [Member]
Significant Accounting Policies [Line Items]
Rental Property	Rental Property Rental properties are stated at cost less accumulated depreciation and amortization. Costs directly related to the acquisition, development and construction of rental properties are capitalized. The Company adopted Financial Accounting Standards Board (“FASB”) guidance Accounting Standards Update (“ASU”) 2017-01 on January 1, 2017, which revises the definition of a business and is expected to result in more transactions to be accounted for as asset acquisitions and significantly limit transactions that would be accounted for as business combinations. Where an acquisition has been determined to be an asset acquisition, acquisition-related costs are capitalized. Capitalized development and construction costs include pre-construction costs essential to the development of the property, development and construction costs, interest, property taxes, insurance, salaries and other project costs incurred during the period of development. Capitalized development and construction salaries and related costs approximated $ 2.0 million, $ 2.1 million and $ 2.3 million for the years ended December 31, 2020, 2019 and 2018, respectively. Ordinary repairs and maintenance are expensed as incurred; major replacements and betterments, which improve or extend the life of the asset, are capitalized and depreciated over their estimated useful lives. Fully-depreciated assets are removed from the accounts. Included in net investment in rental property as of December 31, 2020 and 2019 is real estate and building and tenant improvements not in service; as follows (dollars in thousands) : December 31, December 31, 2020 2019 Land held for development (including pre-development costs, if any) (a)(c) $ 364,946 $ 388,702 Development and construction in progress, including land (b)(d) 733,560 464,110 Total $ 1,098,506 $ 852,812 (a) Includes predevelopment and infrastructure costs included in buildings and improvements of $ 160.3 million and $ 156.5 million as of December 31, 2020 and December 31, 2019, respectively. (b) Includes land of $ 74.9 million and $ 96.6 million as of December 31, 2020 and December 31, 2019, respectively. (c) Includes $ 31.9 million of land and $ 8.9 million of building and improvements pertaining to assets held for sale at December 31, 2020. The Company considers a construction project as substantially completed and held available for occupancy upon the substantial completion of improvements, but no later than one year from cessation of major construction activity (as distinguished from activities such as routine maintenance and cleanup). If portions of a rental project are substantially completed and occupied by tenants or residents, or held available for occupancy, and other portions have not yet reached that stage, the substantially completed portions are accounted for as a separate project. The Company allocates costs incurred between the portions under construction and the portions substantially completed and held available for occupancy, primarily based on a percentage of the relative commercial square footage or multi-family units of each portion, and capitalizes only those costs associated with the portion under construction. Properties are depreciated using the straight-line method over the estimated useful lives of the assets. The estimated useful lives are as follows: Leasehold interests Remaining lease term Buildings and improvements 5 to 40 years Tenant improvements The shorter of the term of the related lease or useful life Furniture, fixtures and equipment 5 to 10 years Upon acquisition of rental property, the Company estimates the fair value of acquired tangible assets, consisting of land, building and improvements, and identified intangible assets and liabilities assumed, generally consisting of the fair value of (i) above and below-market leases, (ii) in-place leases and (iii) tenant relationships. For asset acquisitions, the Company allocates the purchase price to the assets acquired and liabilities assumed based on their relative fair values. The Company records goodwill or a gain on bargain purchase (if any) if the net assets acquired/liabilities assumed differ from the purchase consideration of a business combination transaction. In estimating the fair value of the tangible and intangible assets acquired, the Company considers information obtained about each property as a result of its due diligence and marketing and leasing activities, and utilizes various valuation methods, such as estimated cash flow projections utilizing appropriate discount and capitalization rates, estimates of replacement costs net of depreciation, and available market information. The fair value of the tangible assets of an acquired property considers the value of the property as if it were vacant. Above-market and below-market lease values for acquired properties are initially recorded based on the present value (using a discount rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to each in-place lease and (ii) management’s estimate of fair market lease rates for each corresponding in-place lease, measured over a period equal to the remaining term of the lease for above-market leases and the remaining initial term plus the term of any below-market fixed rate renewal options for below-market leases. The capitalized above-market lease values are amortized as a reduction of base rental revenue over the remaining terms of the respective leases, and the capitalized below-market lease values are amortized as an increase to base rental revenue over the remaining initial terms plus the terms of any below-market fixed rate renewal options of the respective leases. Other intangible assets acquired include amounts for in-place lease values and tenant relationship values, which are based on management’s evaluation of the specific characteristics of each tenant’s lease and the Company’s overall relationship with the respective tenant. Factors to be considered by management in its analysis of in-place lease values include an estimate of carrying costs during hypothetical expected lease-up periods considering current market conditions, and costs to execute similar leases. In estimating carrying costs, management includes real estate taxes, insurance and other operating expenses and estimates of lost rentals at market rates during the expected lease-up periods, depending on local market conditions. In estimating costs to execute similar leases, management considers leasing commissions, legal and other related expenses. Characteristics considered by management in valuing tenant relationships include the nature and extent of the Company’s existing business relationships with the tenant, growth prospects for developing new business with the tenant, the tenant’s credit quality and expectations of lease renewals. The values of in-place leases are amortized to expense over the remaining initial terms of the respective leases. The values of tenant relationship intangibles are amortized to expense over the anticipated life of the relationships or leases. On a periodic basis, management assesses whether there are any indicators that the value of the Company’s rental properties held for use may be impaired. In addition to identifying any specific circumstances which may affect a property or properties, management considers other criteria for determining which properties may require assessment for potential impairment. The criteria considered by management, depending on the type of property, may include reviewing low leased percentages, significant near-term lease expirations, current and historical operating and/or cash flow losses, construction cost overruns and/or other factors, including those that might impact the Company’s intent and ability to hold the property. A property’s value is impaired only if management’s estimate of the aggregate future cash flows (undiscounted and without interest charges) to be generated by the property over its estimated holding period is less than the carrying value of the property. If there are different possible scenarios for a property, the Company will take a probability weighted approach to estimating future cash flow scenarios. To the extent impairment has occurred, the impairment loss is measured as the excess of the carrying value of the property over the fair value of the property. The Company’s estimates of aggregate future cash flows expected to be generated and estimated fair values for each property are based on a number of assumptions, including but not limited to estimated holding periods, market capitalization rates and discount rates, if applicable. For developable land holdings, an estimated per-unit market value assumption is also considered based on development rights for the land. These assumptions are generally based on management’s experience in its local real estate markets and the effects of current market conditions. The assumptions are subject to economic and market uncertainties including, among others, demand for space, competition for tenants, changes in market rental rates, food, beverage and lodging demands, and costs to operate each property. As these factors are difficult to predict and are subject to future events that may alter management’s assumptions, the future cash flows estimated by management in its impairment analyses may not be achieved, and actual losses or impairments may be realized in the future.
Real Estate Held For Sale And Discontinued Operations	Real Estate Held for Sale and Discontinued Operations When assets are identified by management as held for sale, the Company discontinues depreciating the assets and estimates the sales price, net of expected selling costs, of such assets. The Company generally considers assets (as identified by their disposal groups) to be held for sale when the transaction has received appropriate corporate authority, it is probable to be sold within the following 12 months, and there are no significant contingencies relating to a sale. If, in management’s opinion, the estimated net sales price, net of expected selling costs, of the disposal groups which have been identified as held for sale is less than the carrying value of the assets, a valuation allowance (which is recorded as unrealized losses on disposition of rental property) is established. In the absence of an executed sales agreement with a set sales price, management’s estimate of the net sales price may be based on a number of assumptions, including but not limited to the Company’s estimates of future cash flows, market capitalization rates and discount rates, if applicable. For developable land holdings, an estimated per-unit market value assumption is also considered based on development rights for the land. In addition, the Company classifies assets held for sale or sold as discontinued operations if the disposal groups represent a strategic shift that will have a major effect on the Company’s operations and financial results. For any disposals qualifying as discontinued operations, the assets and their results are presented in discontinued operations in the financial statements for all periods presented. See Note 7: Discontinued Operations. If circumstances arise that previously were considered unlikely and, as a result, the Company has determined that an asset previously classified as held for sale, no longer meets the held for sale criteria, the asset is reclassified as held and used. An asset that is reclassified is measured and recorded individually at the lower of (a) its carrying value before the asset was classified as held for sale, adjusted for any depreciation (amortization) expense that would have been recognized had the asset been continuously classified as held and used, or (b) the fair value at the date the asset qualified as held for sale.
Investments In Unconsolidated Joint Ventures	Investments in Unconsolidated Joint Ventures The Company accounts for its investments in unconsolidated joint ventures under the equity method of accounting. The Company applies the equity method by initially recording these investments at cost, as Investments in Unconsolidated Joint Ventures, subsequently adjusted for equity in earnings and cash contributions and distributions. The outside basis portion of the Company’s joint ventures is amortized over the anticipated useful lives of the underlying ventures’ tangible and intangible assets acquired and liabilities assumed. Generally, the Company would discontinue applying the equity method when the investment (and any advances) is reduced to zero and would not provide for additional losses unless the Company has guaranteed obligations of the venture or is otherwise committed to providing further financial support for the investee. If the venture subsequently generates income, the Company only recognizes its share of such income to the extent it exceeds its share of previously unrecognized losses. If the venture subsequently makes distributions and the Company does not have an implied or actual commitment to support the operations of the venture, the Company will not record a basis less than zero, rather such amounts will be recorded as equity in earnings of unconsolidated joint ventures. On a periodic basis, management assesses whether there are any indicators that the value of the Company’s investments in unconsolidated joint ventures may be impaired. An investment is impaired only if management’s estimate of the value of the investment is less than the carrying value of the investment, and such decline in value is deemed to be other than temporary. To the extent impairment has occurred, the loss shall be measured as the excess of the carrying value of the investment over the value of the investment. The Company’s estimates of value for each investment (particularly in real estate joint ventures) are based on a number of assumptions including but not limited to estimates of future cash flows, market capitalization rates and discount rates, if applicable. These assumptions are based on management's experience in its local real estate markets and the effects of current market conditions. The assumptions are subject to economic and market uncertainties including, among others, demand for space, competition for tenants, changes in market rental rates, and operating costs. As these factors are difficult to predict and are subject to future events that may alter management’s assumptions, the values estimated by management in its impairment analyses may not be realized, and actual losses or impairment may be realized in the future. See Note 4: Investments in Unconsolidated Joint Ventures.
Cash And Cash Equivalents	Cash and Cash Equivalents All highly liquid investments with an original maturity of three months or less when purchased are considered to be cash equivalents.
Deferred Financing Costs	Deferred Financing Costs Costs incurred in obtaining financing are capitalized and amortized over the term of the related indebtedness. Deferred financing costs are presented in the balance sheet as a direct deduction from the carrying value of the debt liability to which they relate, except deferred financing costs related to the revolving credit facility, which are presented in deferred charges, goodwill and other assets. In all cases, amortization of such costs is included in interest expense and was $ 4,625,000 , $ 4,625,000 and $ 5,028,000 for the years ended December 31, 2020, 2019 and 2018, respectively. If a financing obligation is extinguished early, any unamortized deferred financing costs are written off and included in gains (losses) from extinguishment of debt. Included in the gains(losses) from extinguishment of debt, net, of $( 0.3 ) million, $ 1.6 million and $( 10.8 ) million (of which $ 1.8 million loss pertained to properties classified as discontinued operations) for the years ended December 31, 2020, 2019 and 2018 were unamortized deferred financing costs which were written off (as non-cash transactions) amounting to zero , $ 0.4 million and $ 0.6 million, respectively.
Deferred Leasing Costs/Leasing Personnel Costs	Deferred Leasing Costs/Leasing Personnel Costs Costs incurred in connection with successfully executed commercial and residential leases were capitalized and amortized on a straight-line basis over the terms of the related leases and included in depreciation and amortization. Unamortized deferred leasing costs were charged to amortization expense upon early termination of the lease. Certain employees of the Company are compensated for providing leasing services to the Properties. The portion of such compensation related to commercial leases, which was capitalized and amortized, and included in deferred charges, goodwill and other assets, net, was approximately $ 3,463,000 for the year ended December 31, 2018. Upon the adoption of ASC 842 on January 1, 2019, the Company no longer capitalizes such costs, and includes such leasing personnel costs in General and Administrative expense costs in the Company’s Consolidated Statements of Operations, which amounted to $ 1,483,000 and $ 2,261,000 (excluding any severance – related costs) for the years ended December 31, 2020 and 2019, respectively.
Goodwill	Goodwill Goodwill represents the excess of the purchase price over the fair value of net tangible and intangible assets acquired in a business combination. Goodwill is allocated to various reporting units, as applicable. Each of the Company’s segments consists of a reporting unit. Goodwill is not amortized. Management performs an annual impairment test for goodwill during the fourth quarter and between annual tests, management evaluates the recoverability of goodwill whenever events or changes in circumstances indicate that the carrying value of goodwill may not be fully recoverable. In its impairment tests of goodwill, management first assesses qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying value. If, based on this assessment, management determines that the fair value of the reporting unit is not less than its carrying value, then performing the additional two-step impairment test is unnecessary. If the carrying value of goodwill exceeds its fair value, an impairment charge is recognized. The Company determined that its goodwill, with a balance of $ 2.9 million, was no t impaired at December 31, 2020 after management performed its impairment tests.
Derivative Instruments	Derivative Instruments The Company measures derivative instruments, including certain derivative instruments embedded in other contracts, at fair value and records them as an asset or liability, depending on the Company’s rights or obligations under the applicable derivative contract. For derivatives designated and qualifying as fair value hedges, the changes in the fair value of both the derivative instrument and the hedged item are recorded in earnings. For derivatives designated as cash flow hedges, the effective portions of the derivative are reported in other comprehensive income (“OCI”) and are subsequently reclassified into earnings when the hedged item affects earnings. Changes in fair value of derivative instruments not designated as hedging and ineffective portions of hedges are recognized in earnings in the affected period.
Revenue Recognition	Revenue Recognition Revenue from leases includes fixed base rents under leases, which are recognized on a straight-line basis over the terms of the respective leases. Unbilled rents receivable represents the cumulative amount by which straight-line rental revenue exceeds rents currently billed in accordance with the lease agreements. Above-market and below-market lease values for acquired properties are initially recorded based on the present value (using a discount rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to each in-place lease and (ii) management’s estimate of fair market lease rates for each corresponding in-place lease, measured over a period equal to the remaining term of the lease for above-market leases and the remaining initial term plus the term of any below-market fixed-rate renewal options for below-market leases. The capitalized above-market lease values for acquired properties are amortized as a reduction of revenue from leases over the remaining terms of the respective leases, and the capitalized below-market lease values are amortized as an increase to revenue from leases over the remaining initial terms plus the terms of any below-market fixed-rate renewal options of the respective leases. The Company elected a practical expedient for its rental properties (as lessor) to avoid separating non-lease components that otherwise would need to be accounted for under the recently-adopted revenue accounting guidance (such as tenant reimbursements of property operating expenses) from the associated lease component since (1) the non-lease components have the same timing and pattern of transfer as the associated lease component and (2) the lease component, if accounted for separately, would be classified as an operating lease; this enables the Company to account for the combination of the lease component and non-lease components as an operating lease since the lease component is the predominant component of the combined components. Due to the Company’s adoption of the practical expedient discussed above to not separate non-lease component revenue from the associated lease component, the Company is aggregating revenue from its lease components and non-lease components (comprised predominantly of tenant operating expense reimbursements) into the line entitled “Revenue from leases.” Revenue from leases also includes reimbursements and recoveries from tenants received from tenants for certain costs as provided in the lease agreements. These costs generally include real estate taxes, utilities, insurance, common area maintenance and other recoverable costs. See Note 14: Tenant Leases. Real estate services revenue includes property management, development, construction and leasing commission fees and other services, and payroll and related costs reimbursed from clients. Fee income derived from the Company’s unconsolidated joint ventures (which are capitalized by such ventures) are recognized to the extent attributable to the unaffiliated ownership interests. Parking income is comprised of income from parking spaces leased to tenants and others. Hotel income includes all revenue generated from hotel properties. Other income includes income from tenants for additional services arranged for by the Company and income from tenants for early lease terminations. All bad debt expense is being recorded as a reduction of the corresponding revenue account starting on January 1, 2019. Management performs a detailed review of amounts due from tenants for collectability, based on factors affecting the billings and status of individual tenants. The factors considered by management in determining which individual tenant’s revenues are affected include the age of the receivable, the tenant’s payment history, the nature of the charges, any communications regarding the charges and other related information. Management’s estimate of bad debt write-off’s requires management to exercise judgment about the timing, frequency and severity of collection losses, which affects the revenue recorded.
Income And Other Taxes	Income and Other Taxes The General Partner has elected to be taxed as a REIT under Sections 856 through 860 of the Internal Revenue Code of 1986, as amended (the “IRS Code”). As a REIT, the General Partner generally will not be subject to corporate federal income tax on net income that it currently distributes to its shareholders, provided that the General Partner satisfies certain organizational and operational requirements including the requirement to distribute at least 90 percent of its REIT taxable income (determined by excluding any net capital gains) to its shareholders. If and to the extent the General Partner retains and does not distribute any net capital gains, the General Partner will be required to pay federal, state and local taxes, as applicable, on such net capital gains at the rate applicable to capital gains of a corporation. The Operating Partnership is a partnership, and, as a result, all income and losses of the partnership are allocated to the partners for inclusion in their respective tax returns. Accordingly, no provision or benefit for income taxes has been made in the accompanying financial statements. As of December 31, 2020, the estimated net basis of the rental property for federal income tax purposes was lower than the net assets as reported in the Operating Partnership’s financial statements by approximately $ 669,239,000 . The Operating Partnership’s taxable income for the years ended December 31, 2020, 2019 and 2018 was estimated to be approximately $ 79,293,000 , $ 71,151,000 and $ 82,106,000 , respectively. The differences between book income and taxable income primarily result from differences in depreciation expenses, the recording of rental income, differences in the deductibility of interest expense and certain other expenses for tax purposes, differences in revenue recognition and the rules for tax purposes of a property exchange. The General Partner has elected to treat certain of its corporate subsidiaries as taxable REIT subsidiaries (each a “TRS”). In general, a TRS of the General Partner may perform additional services for tenants of the Company and generally may engage in any real estate or non-real estate related business (except for the operation or management of health care facilities or lodging facilities or the providing to any person, under a franchise, license or otherwise, rights to any brand name under which any lodging facility or health care facility is operated). A TRS is subject to corporate federal income tax. The General Partner has conducted business through its TRS entities for certain property management, development, construction and other related services, as well as to hold a joint venture interest in a hotel and other matters. The deferred tax asset balance at December 31, 2020 amounted to $ 16.2 million which has been fully reserved through a valuation allowance. New tax reform legislation enacted in late 2017 reduced the corporate tax rate to 21 percent, effective January 1, 2018. Consequently, the Company’s deferred tax assets were re-measured to reflect the reduction in the future U.S. corporate income tax rate as of the enactment date. As a result, the Company recorded a decrease related to its deferred tax assets of $ 5.3 million and a decrease to the associated valuation allowance of $ 5.3 million at December 31, 2017. If the General Partner fails to qualify as a REIT in any taxable year, the Company will be subject to federal income tax on its taxable income at regular corporate tax rates. The Company is subject to certain state and local taxes. Pursuant to the amended provisions related to uncertain tax provisions of ASC 740, Income Taxes, the Company recognized no material adjustments regarding its tax accounting treatment. The Company expects to recognize interest and penalties related to uncertain tax positions, if any, as income tax expense, which is included in general and administrative expense. In the normal course of business, the Company or one of its subsidiaries is subject to examination by federal, state and local jurisdictions in which it operates, where applicable. As of December 31, 2020, the tax years that remain subject to examination by the major tax jurisdictions under the statute of limitations are generally from the year 2016 forward.
Earnings Per Share Or Unit	Earnings Per Share or Unit The Company presents both basic and diluted earnings per share or unit (“EPS or EPU”). Basic EPS or EPU excludes dilution and is computed by dividing net income available to common shareholders or unitholders by the weighted average number of shares or units outstanding for the period. Diluted EPS or EPU reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock, where such exercise or conversion would result in a lower EPS or EPU from continuing operations amount. Shares or units whose issuance is contingent upon the satisfaction of certain conditions shall be considered outstanding and included in the computation of diluted EPS or EPU as follows (i) if all necessary conditions have been satisfied by the end of the period (the events have occurred), those shares or units shall be included as of the beginning of the period in which the conditions were satisfied (or as of the date of the grant, if later) or (ii) if all necessary conditions have not been satisfied by the end of the period, the number of contingently issuable shares or units included in diluted EPS or EPU shall be based on the number of shares or units, if any, that would be issuable if the end of the reporting period were the end of the contingency period (for example, the number of shares or units that would be issuable based on current period earnings or period-end market price) and if the result would be dilutive. Those contingently issuable shares or units shall be included in the denominator of diluted EPS or EPU as of the beginning of the period (or as of the date of the grant, if later).
Dividends And Distributions Payable	Dividends and Distributions Payable On September 30, 2020, the Company announced that its Board of Directors was suspending its common dividends and distributions attributable to the third and fourth quarters 2020. As the Company’s management estimated that as of September 2020 it had satisfied its dividends obligations as a REIT on taxable income expected for 2020, the Board made the strategic decision to suspend its common dividends and distributions for the remainder of 2020 in an effort to provide greater financial flexibility during the pandemic and to retain incremental capital to support leasing initiatives at its Harborside commercial office properties on the Jersey City waterfront. The dividends and distributions payable at December 31, 2020 represent amounts payable on unvested LTIP units. The dividends and distributions payable at December 31, 2019 represents dividends payable to common shareholders ( 90,595,197 shares) and distributions payable to noncontrolling interests unitholders of the Operating Partnership ( 9,488,794 common units and 1,949,601 vested and unvested LTIP units) for all such holders of record as of January 3, 2020 with respect to the fourth quarter 2019. The fourth quarter 2019 common stock dividends and unit distributions of $ 0.20 per common share (total of $ 18.1 million), common unit (total of $ 1.9 million) and LTIP unit (total of $ 0.4 million) were approved by the General Partner’s Board of Directors on December 17, 2019 and paid on January 10, 2020 . The Company has determined that the $ 0.60 dividend per common share paid during the year ended December 31, 2020 represented approximately 19 percent ordinary income and approximately 81 percent capital gain; the $ 0.80 dividend per common share paid during the year ended December 31, 2019 represented 100 percent capital gain and the $ 0.80 dividend per common share paid during the year ended December 31, 2018 represented approximately 47 percent ordinary income and approximately 53 percent capital gain.
Costs Incurred For Stock Issuances	Costs Incurred For Stock Issuances Costs incurred in connection with the Company’s stock issuances are reflected as a reduction of additional paid - in capital.
Stock Compensation	Stock Compensation The Company accounts for stock compensation in accordance with the provisions of ASC 718, Compensation-Stock Compensation. These provisions require that the estimated fair value of restricted stock (“Restricted Stock Awards”), performance share units, long term incentive plan awards and stock options at the grant date be amortized ratably into expense over the appropriate vesting period. For unvested securities that are forfeited prior to the measurement period being complete, the Company elected to account for forfeiture of employee awards as they occur. The Company recorded stock compensation expense of $ 7,635,000 , $ 8,161,000 and $ 6,894,000 for the years ended December 31, 2020, 2019 and 2018, respectively.
Other Comprehensive Income (Loss)	Other Comprehensive Income (Loss) Other comprehensive income (loss) includes items that are recorded in equity, such as effective portions of derivatives designated as cash flow hedges or unrealized holding gains or losses on marketable securities available for sale.
Redeemable Noncontrolling Interests	Redeemable Noncontrolling Interests The Company evaluates the terms of the partnership units issued in accordance with the FASB’s Distinguishing Liabilities from Equity guidance. Units which embody an unconditional obligation requiring the Company to redeem the units for cash after a specified or determinable date (or dates) or upon the occurrence of an event that is not solely within the control of the issuer are determined to be contingently redeemable under this guidance and are included as Redeemable noncontrolling interests and classified within the mezzanine section between Total liabilities and Stockholders’ equity on the Company’s Consolidated Balance Sheets. The carrying amount of the redeemable noncontrolling interests will be changed by periodic accretions, so that the carrying amount will equal the estimated future redemption value at the redemption date.
Fair Value Hierarchy	Fair Value Hierarchy The standard Fair Value Measurements specifies a hierarchy of valuation techniques based upon whether the inputs to those valuation techniques reflect assumptions other market participants would use based upon market data obtained from independent sources (observable inputs). The following summarizes the fair value hierarchy:  Level 1: Quoted prices in active markets that are unadjusted and accessible at the measurement date for identical, unrestricted assets or liabilities;  Level 2: Quoted prices for identical assets and liabilities in markets that are inactive, quoted prices for similar assets and liabilities in active markets or financial instruments for which significant inputs are observable, either directly or indirectly, such as interest rates and yield curves that are observable at commonly quoted intervals and  Level 3: Prices or valuations that require inputs that are both significant to the fair value measurement and unobservable. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, the level in the fair value hierarchy within which the fair value measurement in its entirety falls has been determined based on the lowest level input that is significant to the fair value measurement in its entirety. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability.
Impact Of Recently-Issued Accounting Standards	Impact of Recently-Issued Accounting Standards In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses (“ASU 2016-13”). The guidance introduces a new model for estimating credit losses for certain types of financial instruments, including trade and lease receivables, loans receivable, held-to-maturity debt securities, and net investments in direct financing leases, amongst other financial instruments. ASU 2016-13 also modifies the impairment model for available-for-sale debt securities and expands the disclosure requirements regarding an entity’s assumptions, models, and methods for estimating the allowance for losses. ASU 2016-13 is effective for annual reporting periods beginning after December 15, 2019, including interim periods within those fiscal years, with early adoption permitted. The adoption of ASU 2016-13 did not have a material impact on the Company’s consolidated financial statements. In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities (“ASU 2017-12”). The purpose of ASU 2017-12 is to better align a company’s financial reporting for hedging activities with the economic objectives of those activities. The Company has adopted ASU 2017-12 on January 1, 2019. ASU 2017-12 requires a modified retrospective transition method which requires a cumulative effect of the change on the opening balance of each affected component of equity in the Company’s consolidated financial statements as of the date of adoption. Upon adoption, the Company recorded a cumulative adjustment specifically related to the elimination of the requirement for separate measurement of hedge ineffectiveness. As a result, the Company recorded an opening balance adjustment as of January 1, 2019 to dividends in excess of net earnings of $ 0.4 million with a corresponding change to accumulated other comprehensive income (loss). In March 2020, the FASB issued ASU 2020-04 Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Rate Reform on Financial Reporting. The amendments provide practical expedients for reference rate reform related activities that impact debt, leases, derivatives and other contracts. The guidance is optional and is effective between March 12, 2020 and December 31, 2022. The guidance may be elected over time as reference rate reform activities occur. The Company is currently in the process of evaluating the impact the adoption of ASU 2020-04 will have on the Company’s consolidated financial statements. In April 2020, the FASB issued a Staff Question-and-Answer (“Q&A”) to clarify whether lease concessions related to the effects of COVID-19 require the application of the lease modification guidance under the new lease standard, which was adopted on January 1, 2019. Under the new leasing standard, an entity would have to determine, on a lease by lease basis, if a lease concession was the result of a new arrangement reached with the tenant, which would be accounted for under the lease modification framework, or if the lease concession was under the enforceable rights and obligations that existed in the original lease, which would be accounted for outside the lease modification framework. The Q&A provides entities with the option to elect to account for lease concessions as though the enforceable rights and obligations existed in the original lease as long as the total cash flows from the modified lease are substantially similar to the cash flows in the original lease. The Company elected this option and therefore, to the extent that rent concession is granted as a deferral of payments but total payments are substantially the same, will account for the concession as if no change has been made to the original lease.

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2020
Significant Accounting Policies [Line Items]
Schedule Of Rental Property Improvements	December 31, December 31, 2020 2019 Land held for development (including pre-development costs, if any) (a)(c) $ 364,946 $ 388,702 Development and construction in progress, including land (b)(d) 733,560 464,110 Total $ 1,098,506 $ 852,812 (a) Includes predevelopment and infrastructure costs included in buildings and improvements of $ 160.3 million and $ 156.5 million as of December 31, 2020 and December 31, 2019, respectively. (b) Includes land of $ 74.9 million and $ 96.6 million as of December 31, 2020 and December 31, 2019, respectively. (c) Includes $ 31.9 million of land and $ 8.9 million of building and improvements pertaining to assets held for sale at December 31, 2020.
Estimated Useful Lives Of Assets	Leasehold interests Remaining lease term Buildings and improvements 5 to 40 years Tenant improvements The shorter of the term of the related lease or useful life Furniture, fixtures and equipment 5 to 10 years
Mack-Cali Realty LP [Member]
Significant Accounting Policies [Line Items]
Schedule Of Rental Property Improvements	December 31, December 31, 2020 2019 Land held for development (including pre-development costs, if any) (a)(c) $ 364,946 $ 388,702 Development and construction in progress, including land (b)(d) 733,560 464,110 Total $ 1,098,506 $ 852,812 (a) Includes predevelopment and infrastructure costs included in buildings and improvements of $ 160.3 million and $ 156.5 million as of December 31, 2020 and December 31, 2019, respectively. (b) Includes land of $ 74.9 million and $ 96.6 million as of December 31, 2020 and December 31, 2019, respectively. (c) Includes $ 31.9 million of land and $ 8.9 million of building and improvements pertaining to assets held for sale at December 31, 2020.
Estimated Useful Lives Of Assets	Leasehold interests Remaining lease term Buildings and improvements 5 to 40 years Tenant improvements The shorter of the term of the related lease or useful life Furniture, fixtures and equipment 5 to 10 years

Recent Transactions (Tables)

Recent Transactions (Tables)	12 Months Ended
	Dec. 31, 2020
Real Estate Properties [Line Items]
Schedule Of Properties Acquired	Rentable Acquisition Property # of Square Feet/ Acquisition Date Property Address Location Type Bldgs. Apartment Units Cost 02/06/19 99 Wood Avenue (a) Iselin, New Jersey Office 1 271,988 $ 61,858 04/01/19 Soho Lofts (a) Jersey City, New Jersey Multi-family 1 377 264,578 09/26/19 Liberty Towers (b) Jersey City, New Jersey Multi-family 1 648 410,483 Total Acquisitions 3 $ 736,919 (a) This acquisition was funded using funds available with the Company's qualified intermediary from prior property sales proceeds and through borrowing under the Company's unsecured revolving credit facility. (b) This acquisition was funded through borrowings under the Company's unsecured revolving credit facility and a new $ 232 million mortgage loan collateralized by the property.
Schedule Of Acquisition Cost Allocated To Net Assets Acquired	99 Wood Avenue Soho Lofts Apartments Liberty Towers Total Land and leasehold interest $ 9,261 $ 27,601 $ 66,670 $ 103,532 Buildings and improvements and other assets 45,576 231,663 330,935 608,174 Above market lease values 431 (a) - 56 (c) 487 In-place lease values 8,264 (a) 5,480 (b) 13,462 (c) 27,206 63,532 264,744 411,123 739,399 Less: Below market lease values ( 1,674 ) (a) ( 166 ) (b) ( 640 ) (c) ( 2,480 ) Net assets recorded upon acquisition $ 61,858 $ 264,578 $ 410,483 $ 736,919 (a) Above market, in-place and below market lease values are being amortized over a weighted-average term of 4.3 years. (b) In-place and below market lease values are being amortized over a weighted-average term of 0.8 years. (c) Above market, in-place and below market lease values are being amortized over a weighted-average term of 0.5 years.
Schedule Of Properties Which Commenced Initial Operations	2020 Total In Service Property # of Development Date Property Location Type Apartment Units Costs Incurred 03/01/20 Emery at Overlook Ridge Malden, MA Multi-Family 326 $ 103,993 Totals 326 $ 103,993 2019 # of Total In Service Property Apartment Units/ Development Date Property Location Type Rooms Costs Incurred 07/09/19 Autograph Collection By Marriott (Phase II) Weehawken, NJ Hotel 208 $ 105,477 Totals 208 $ 105,477
Schedule Of Net Assets Recorded Upon Consolidation	2020 On March 12, 2020, the Company, acquired its equity partner's 80 percent interest in Port Imperial North Retail L.L.C., a ground floor retail space totaling 30,745 square feet located at Port Imperial, West New York, New Jersey for $ 13.3 million in cash (funded through borrowing under the Company’s unsecured credit facility.) The results of the transaction increased the Company’s interest to 100 percent. Upon the acquisition, the Company consolidated the joint venture, a voting interest entity. As an acquisition of the remaining interests in the venture which owns the Port Imperial North Retail L.L.C., the Company accounted for the transaction as an asset acquisition under a cost accumulation model, and as such no gain on change of control of interest was recognized in consolidation, resulting in total consolidated net assets of $ 15.0 million, which are allocated as follows: Port Imperial North Retail L.L.C. Land and leasehold interests $ 4,305 Buildings and improvements and other assets, net 8,912 In-place lease values (a) 1,503 Above/Below market lease value, net (a) 313 Net assets recorded upon consolidation $ 15,033 (a) In-place and below market lease values are being amortized over a weighted-average term of 7.5 years. 2019 On January 31, 2019, the Company, which held a 24.27 percent subordinated interest in the unconsolidated joint venture, Marbella Tower Urban Renewal Associates South LLC, a 311 -unit multi-family operating property located in Jersey City, New Jersey, acquired its equity partner’s 50 percent preferred controlling interest for $ 77.5 million in cash. The property was subject to a mortgage loan that had a principal balance of $ 74.7 million. The acquisition was funded primarily using available cash. Concurrently with the closing, the joint venture repaid in full the property’s $ 74.7 million mortgage loan and obtained a new loan collateralized by the property in the amount of $ 117 million, which bears interest at 4.2 percent and matures in August 2026 . The Company received $ 43.3 million in distribution from the loan proceeds which was used to acquire the equity partner’s 50 percent interest. As the result of the acquisition, the Company increased its ownership of the property from a 24.27 percent subordinated interest to a 74.27 percent controlling interest. In accordance with ASC 810, Consolidation, the Company evaluated the acquisition and determined that the entity meets the criteria of a VIE. As such, the Company consolidated the asset upon acquisition and accordingly, remeasured its equity interests, as required by the FASB’s consolidation guidance, at fair value (based upon the income approach using current rental rates and market cap rates and discount rates). As a result, the Company recorded a gain on change of control of interests of $ 13.8 million (a non-cash item) in the year ended December 31, 2019, in which the Company accounted for the transaction as a VIE that is not a business in accordance with ASC 810-10-30-4. Additional non-cash items included in the acquisition were the Company’s carrying value of its interest in the joint venture of $ 15.3 million and the noncontrolling interest’s fair value of $ 13.7 million. See Note 9: Mortgages, Loans Payable and Other Obligations. Marbella II Land and leasehold interests $ 36,595 Buildings and improvements and other assets, net 153,974 In-place lease values (a) 4,611 Less: Below market lease values (a) ( 80 ) 195,100 Less: Debt ( 117,000 ) Net assets 78,100 Less: Noncontrolling interests ( 13,722 ) Net assets recorded upon consolidation $ 64,378 (a) In-place and below market lease values are being amortized over a weighted-average term of 6.2 months.
Schedule Of Property Disposals	Real Estate Held for Sale/Discontinued Operations/Dispositions 2020 On December 19, 2019, the Company announced that its Board had determined to sell the Company’s entire suburban New Jersey office portfolio totaling approximately 6.6 million square feet, which excludes the Company’s office properties in Jersey City and Hoboken, New Jersey, (collectively, the “Suburban Office Portfolio”). As the decision to sell the Suburban Office Portfolio represented a strategic shift in the Company’s operations, these properties’ results (other than a property classified as held for sale) are being classified as discontinued operations for all periods presented herein. As of December 31, 2020, the Company determined that a 350,000 square foot office property in the Suburban Office Portfolio, located in Holmdel, New Jersey no longer met the held for sale criteria. The property had originally been classified as held for sale as of December 31, 2019. The reclassified property has an aggregate book value of $ 19.8 million as of December 31, 2020, net of accumulated depreciation of $ 10.5 million (including catch-up depreciation). $ 2.8 million of previously recorded valuation allowance was reversed upon the reclassification of the asset from held for sale at December 31, 2020, and the corresponding property’s results and valuation allowance are also reclassified out of discontinued operations to continuing operations for all periods presented. See Note 7: Discontinued Operations. In late 2019 through December 31, 2020, the Company completed the sale of 20 of these suburban office properties, totaling 3.2 million square feet, for net sales proceeds of $ 377.4 million. As of December 31, 2020, the Company has identified as held for sale 16 office properties (comprised of six identified disposal groups) in the Suburban Office Portfolio, totaling 3.0 million square feet (of which the Company currently has 15 properties totaling 2.8 million square feet under contract for sale for aggregate gross proceeds of $ 652.4 million). As a result of a signed contract to dispose of a portfolio of four of the properties in an identified disposal group of assets held for sale, the Company may need to pay for significant costs to defease the mortgage loan encumbering the properties, which will be expensed when incurred at the time of such defeasance. See Note 10: Mortgages, loans payable and other obligations. I n January 2021, the Company completed the sale of one of the properties held for sale, which was a 149,600 square foot office property, for a gross sales price of $ 38 million. See Note 7: Discontinued Operations. The Company plans to complete the sale of substantially all of its remaining Suburban Office Portfolio properties in 2021, and to use the available sales proceeds to pay down its corporate-level, unsecured indebtedness. However, the Company cannot predict whether or to what extent the timing of these sales and the expected amount may be impacted by the ongoing coronavirus pandemic (“COVID-19”). After the completion of the Suburban Office Portfolio sales, the Company’s holdings will consist of its waterfront class A office portfolio and its multi-family rental portfolio, and related development projects and land holdings. Additionally, the Company also identified a retail pad leased to others and several developable land parcels as held for sale as of December 31, 2020. The properties are located in Parsippany, Madison, Short Hills, Edison and Red Bank, New Jersey. As a result of recent sales contract amendments and after considering the current market conditions as a result of the challenging economic climate with the current worldwide COVID-19 pandemic, the Company determined that the carrying value of six of the remaining held for sale properties (comprised of three disposal groups), and several land parcels held for sale was not expected to be recovered from estimated net sales proceeds, and accordingly, during the year ended December 31, 2020, recognized an unrealized loss allowance of $ 15.7 million for the properties ($ 14 million of which are from discontinued operations), respectively, and also recorded land and other impairments of $ 9.5 million. As of December 31, 2020, the Company determined that two developable land parcels located in Parsippany, New Jersey were no longer being held for sale. The properties had originally been classified as held for sale as of December 31, 2019. The reclassified properties had an aggregate book value of $ 11.3 million. The following table summarizes the real estate held for sale, net, and other assets and liabilities (dollars in thousands) : Suburban Other Office Assets Portfolio (a) Held for Sale Total Land $ 87,815 $ 76,396 $ 164,211 Building & Other 737,669 42,202 779,871 Less: Accumulated depreciation ( 161,040 ) ( 7,991 ) ( 169,031 ) Less: Cumulative unrealized losses on property held for sale ( 77,357 ) ( 40,731 ) ( 118,088 ) Real estate held for sale, net $ 587,087 $ 69,876 $ 656,963 Suburban Other Office Assets Other assets and liabilities Portfolio (a) Held for Sale Total Unbilled rents receivable, net (b) $ 17,216 $ 2,102 $ 19,318 Deferred charges, net (b) 15,320 661 15,981 Total intangibles, net (b) 26,069 - 26,069 Total deferred charges & other assets, net 42,513 665 43,178 Mortgages & loans payable, net (b) 123,768 - 123,768 Total below market liability (b) 6,538 - 6,538 Accounts payable, accrued exp & other liability 16,972 80 17,052 Unearned rents/deferred rental income (b) 8,422 217 8,639 (a) Classified as discontinued operations at December 31, 2020 for all periods presented. See Note 7: Discontinued Operations. (b) Expected to be removed with the completion of the sales. The Company disposed of the following rental properties during the year ended December 31, 2020 (dollars in thousands) : Discontinued Operations: Realized Realized Gains Gains Rentable Net Net (losses)/ (losses)/ Disposition # of Square Property Sales Carrying Unrealized Unrealized Date Property/Address Location Bldgs. Feet/Units Type Proceeds Value Losses, net Losses, net 03/17/20 One Bridge Plaza Fort Lee, New Jersey 1 200,000 Office $ 35,065 $ 17,743 $ - $ 17,322 07/22/20 3 Giralda Farms (a) Madison, New Jersey 1 141,000 Office 7,510 9,534 - ( 2,024 ) 09/15/20 Morris portfolio (b) Parsippany and Madison, New Jersey 10 1,448,420 Office 155,116 175,772 - ( 20,656 ) 09/18/20 325 Columbia Turnpike Florham Park, New Jersey 1 168,144 Office 24,276 8,020 - 16,256 09/24/20 9 Campus Drive (c) Parsippany, New Jersey 1 156,945 Office 20,678 22,162 - ( 1,484 ) 10/21/20 3&5 Vaughn Drive Princeton, New Jersey 1 98,500 Office 7,282 5,754 - 1,528 11/18/20 7 Campus Drive (d) Parsippany, New Jersey 1 154,395 Office 12,278 11,804 - 474 12/03/20 581 Main Street Woodbridge, New Jersey 1 200,000 Office 58,400 43,113 - 15,287 12/22/20 500 College Road (e) Princeton, New Jersey 1 158,235 Office 4,582 6,044 - ( 1,462 ) 12/23/20 5/10 Dennis St and and 100 Hiram Sq New Brunswick, New Jersey 2 200 units Multi-Family 45,567 38,404 7,163 - Sub-total 20 2,725,639 370,754 338,350 7,163 25,241 Unrealized losses on real estate held for sale ( 1,682 ) ( 14,040 ) Totals 20 2,725,639 $ 370,754 $ 338,350 $ 5,481 $ 11,201 (a) The Company recorded valuation allowances of $ 2.0 million on the held for sale property during the year ended December 31, 2020 and of $ 16.7 million during the year ended December 31, 2019. (b) The Company recorded valuation allowances of $ 21.6 million on the held for sale properties during the year ended December 31, 2020 and of $ 32.5 million during the year ended December 31, 2019. (c) The Company recorded a valuation allowance of $ 3.5 million on this property during the year ended December 31, 2019. (d) The Company recorded valuation allowance of $ 6.0 million on the held for sale property during the year ended December 31, 2019. (e) The Company recorded valuation allowance of $ 1.9 million on the held for sale property during the year ended December 31, 2020. The Company disposed of the following developable land holdings during the year ended December 31, 2020 (dollars in thousands): Realized Gains Net Net (losses)/ Disposition Sales Carrying Unrealized Date Property Address Location Proceeds Value Losses, net 01/03/20 230 & 250 Half Mile Road Middletown, New Jersey $ 7,018 $ 2,969 $ 4,049 03/27/20 Capital Office Park land Greenbelt, Maryland 8,974 8,210 764 12/18/20 14 & 16 Skyline Drive Mount Pleasant, New York 2,925 1,951 974 Totals $ 18,917 $ 13,130 $ 5,787 2019 On December 19, 2019, the Company announced that, based on the recommendations of the Shareholder Value Committee, its Board had determined to sell the Suburban Office Portfolio. As the decision to sell the Suburban Office Portfolio represented a strategic shift in the Company’s operations, the portfolio’s results are being classified as discontinued operations for all periods presented herein. See Note 7: Discontinued Operations. During the year ended December 31, 2019, the Company completed the sale of two of these suburban office properties, totaling 497,000 square feet, for net sales proceeds of $ 52.2 million. As of December 31, 2019, the Company identified as held for sale the remaining 35 office properties (comprised of 12 identified disposal groups) in the Suburban Office Portfolio, totaling 6.1 million square feet. See Note 7: Discontinued Operations. Additionally, the Company also identified a retail pad leased to others and several developable land parcels as held for sale as of December 31, 2019. The properties are located in Fort Lee, Parsippany, Madison, Short Hills, Edison, Red Bank and Florham Park. The Company determined that the carrying value of 21 of the properties (comprised of six disposal groups) and several land parcels held for sale was not expected to be recovered from estimated net sales proceeds, and accordingly, during the year ended December 31, 2019, recognized an unrealized loss allowance of $ 174.1 million ($ 137.9 million of which are from discontinued operations, for the properties and land and other impairments of $ 32.4 million. The following table summarizes the real estate held for sale, net, and other assets and liabilities (dollars in thousands) : Suburban Other Office Assets Portfolio (a) Held for Sale Total Land $ 147,590 $ 87,663 $ 235,253 Building & Other 1,263,738 54,392 1,318,130 Less: Accumulated depreciation ( 401,212 ) ( 11,573 ) ( 412,785 ) Less: Cumulative unrealized losses on property held for sale ( 137,876 ) ( 36,225 ) ( 174,101 ) Real estate held for sale, net $ 872,240 $ 94,257 $ 966,497 Suburban Other Office Assets Other assets and liabilities Portfolio (a) Held for Sale Total Unbilled rents receivable, net (b) $ 30,188 $ 1,956 $ 32,144 Deferred charges, net (b) 32,900 1,432 34,332 Total intangibles, net (b) 33,095 - 33,095 Total deferred charges & other assets, net 68,684 1,730 70,414 Mortgages & loans payable, net (b) 123,650 - 123,650 Total below market liability (b) 8,833 - 8,833 Accounts payable, accrued exp & other liability 21,025 1,792 22,817 Unearned rents/deferred rental income (b) 2,952 - 2,952 (a) Classified as discontinued operations at December 31, 2019 for all periods presented. See Note 7: Discontinued Operations. (b) Expected to be removed with the completion of the sales. The Company disposed of the following rental properties during the year ended December 31, 2019 (dollars in thousands): Discontinued Operations: Realized Realized Gains Gains Rentable Net Net (losses)/ (losses)/ Disposition # of Square Property Sales Carrying Unrealized Unrealized Date Property/Address Location Bldgs. Feet/Units Type Proceeds Value Losses, net Losses, net 01/11/19 721 Route 202-206 South (a) Bridgewater, New Jersey 1 192,741 Office $ 5,651 $ 5,410 $ 241 $ - 01/16/19 Park Square Apartments (b) Rahway, New Jersey 1 159 units Multi-family 34,045 34,032 13 - 01/22/19 2115 Linwood Avenue Fort Lee, New Jersey 1 68,000 Office 15,197 7,433 7,764 - 02/27/19 201 Littleton Road (c) Morris Plains, New Jersey 1 88,369 Office 4,842 4,937 ( 95 ) - 03/13/19 320 & 321 University Avenue Newark, New Jersey 2 147,406 Office 25,552 18,456 7,096 - 03/29/19 Flex portfolio (d) New York and Connecticut 56 3,148,512 Office/Flex 470,348 214,758 255,590 - 06/18/19 650 From Road (e) Paramus, New Jersey 1 348,510 Office 37,801 40,046 ( 2,245 ) - 10/18/19 3600 Route 66 (h) Neptune, New Jersey 1 180,000 Office 25,237 17,246 - 7,991 10/23/19 Chase & Alterra Portfolio (f) Revere and Malden, Massachusetts 3 1,386 units Multi-family 406,817 293,030 113,787 - 12/06/19 5 Wood Hollow Road (g) (h) Parsippany, New Jersey 1 317,040 Office 26,937 33,226 - ( 6,289 ) (i) Sub-total 68 4,490,578 1,052,427 668,574 382,151 1,702 Unrealized losses on real estate held for sale ( 39,049 ) ( 135,052 ) (i) Totals 68 4,490,578 $ 1,052,427 $ 668,574 $ 343,102 $ ( 133,350 ) (a) The Company recorded a valuation allowance of $ 9.3 million on this property during the year ended December 31, 2018. (b) The Company recorded a valuation allowance of $ 6.3 million on this property during the year ended December 31, 2018. (c) The Company recorded a valuation allowance of $ 3.6 million on this property during the year ended December 31, 2018. (d) As part of the consideration from the buyer, who is a noncontrolling interest unitholder of the Operating Partnership, 301,638 Common Units were redeemed by the Company at fair market value of $ 6.6 million as purchase consideration received for two of the properties disposed of in this transaction, which was a non-cash portion of this sales transaction. The Company used the net cash received at closing to repay approximately $ 119.9 million of borrowings under the unsecured revolving credit facility and to repay $ 90 million of its $ 350 million unsecured term loan. The Company also utilized $ 217.4 million of these proceeds on April 1, 2019 to acquire a 377 -unit multi-family property located in Jersey City, New Jersey. (e) The Company recorded a valuation allowance of $ 0.9 million on this property during the year ended December 31, 2018. (f) Proceeds from the sale, which were net of $ 235.8 million of in-place mortgages assumed by the buyer, were used primarily to repay outstanding borrowings under the Company's revolving credit facility that were drawn to fund a portion of the Company's purchase of Liberty Towers. The assumed mortgages were a non-cash portion of this sales transaction. (g) The net sale proceeds were held by a qualified intermediary, which is noncash and recorded in deferred charges, goodwill and other assets as of December 31, 2019. See Note 5: Deferred Charges, Goodwill and Other Assets, Net – to the Financial Statements. The Company recorded an impairment charge of $ 5.8 million at June 30, 2019 before the property was identified as held for sale on September 30, 2019. (h) These pertain to properties classified as discontinued operations. (See Note 7: Discontinued Operations – to the Financial Statements) (i) These include impairments recorded on three properties before they were classified as discontinued operations. The Company disposed of the following developable land holdings during the year ended December 31, 2019 (dollars in thousands): Realized Gains Net Net (losses)/ Disposition Sales Carrying Unrealized Date Property Address Location Proceeds Value Losses, net 04/30/19 Overlook Ridge Revere, Massachusetts $ 685 $ 415 $ 270 09/20/19 Overlook Ridge Revere, Massachusetts 1,135 839 296 11/08/19 150 Monument Street Bala Cynwd, Pennsylvania (a) 8,374 7,874 500 12/19/19 51 Washington Street Conshohocken, Pennsylvania (b) 8,189 8,732 $ ( 543 ) Totals $ 18,383 $ 17,860 $ 523 (a) The Company recorded a land impairment charge of $ 10.9 million on this land parcel during the year ended December 31, 2018. (b) The Company recorded a land impairment charge of $ 13.6 million on this land parcel during the year ended December 31, 2018. The Company recorded additional land impairment charges of $ 2.7 million on this land parcel during the year ended December 31, 2019 prior to its disposition.
Mack-Cali Realty LP [Member]
Real Estate Properties [Line Items]
Schedule Of Properties Acquired	Rentable Acquisition Property # of Square Feet/ Acquisition Date Property Address Location Type Bldgs. Apartment Units Cost 02/06/19 99 Wood Avenue (a) Iselin, New Jersey Office 1 271,988 $ 61,858 04/01/19 Soho Lofts (a) Jersey City, New Jersey Multi-family 1 377 264,578 09/26/19 Liberty Towers (b) Jersey City, New Jersey Multi-family 1 648 410,483 Total Acquisitions 3 $ 736,919 (a) This acquisition was funded using funds available with the Company's qualified intermediary from prior property sales proceeds and through borrowing under the Company's unsecured revolving credit facility. (b) This acquisition was funded through borrowings under the Company's unsecured revolving credit facility and a new $ 232 million mortgage loan collateralized by the property.
Schedule Of Acquisition Cost Allocated To Net Assets Acquired	99 Wood Avenue Soho Lofts Apartments Liberty Towers Total Land and leasehold interest $ 9,261 $ 27,601 $ 66,670 $ 103,532 Buildings and improvements and other assets 45,576 231,663 330,935 608,174 Above market lease values 431 (a) - 56 (c) 487 In-place lease values 8,264 (a) 5,480 (b) 13,462 (c) 27,206 63,532 264,744 411,123 739,399 Less: Below market lease values ( 1,674 ) (a) ( 166 ) (b) ( 640 ) (c) ( 2,480 ) Net assets recorded upon acquisition $ 61,858 $ 264,578 $ 410,483 $ 736,919 (a) Above market, in-place and below market lease values are being amortized over a weighted-average term of 4.3 years. (b) In-place and below market lease values are being amortized over a weighted-average term of 0.8 years. (c) Above market, in-place and below market lease values are being amortized over a weighted-average term of 0.5 years.
Schedule Of Properties Which Commenced Initial Operations	2020 Total In Service Property # of Development Date Property Location Type Apartment Units Costs Incurred 03/01/20 Emery at Overlook Ridge Malden, MA Multi-Family 326 $ 103,993 Totals 326 $ 103,993 2019 # of Total In Service Property Apartment Units/ Development Date Property Location Type Rooms Costs Incurred 07/09/19 Autograph Collection By Marriott (Phase II) Weehawken, NJ Hotel 208 $ 105,477 Totals 208 $ 105,477
Schedule Of Net Assets Recorded Upon Consolidation	2020 On March 12, 2020, the Company, acquired its equity partner's 80 percent interest in Port Imperial North Retail L.L.C., a ground floor retail space totaling 30,745 square feet located at Port Imperial, West New York, New Jersey for $ 13.3 million in cash (funded through borrowing under the Company’s unsecured credit facility.) The results of the transaction increased the Company’s interest to 100 percent. Upon the acquisition, the Company consolidated the joint venture, a voting interest entity. As an acquisition of the remaining interests in the venture which owns the Port Imperial North Retail L.L.C., the Company accounted for the transaction as an asset acquisition under a cost accumulation model, and as such no gain on change of control of interest was recognized in consolidation, resulting in total consolidated net assets of $ 15.0 million, which are allocated as follows: Port Imperial North Retail L.L.C. Land and leasehold interests $ 4,305 Buildings and improvements and other assets, net 8,912 In-place lease values (a) 1,503 Above/Below market lease value, net (a) 313 Net assets recorded upon consolidation $ 15,033 (a) In-place and below market lease values are being amortized over a weighted-average term of 7.5 years. 2019 On January 31, 2019, the Company, which held a 24.27 percent subordinated interest in the unconsolidated joint venture, Marbella Tower Urban Renewal Associates South LLC, a 311 -unit multi-family operating property located in Jersey City, New Jersey, acquired its equity partner’s 50 percent preferred controlling interest for $ 77.5 million in cash. The property was subject to a mortgage loan that had a principal balance of $ 74.7 million. The acquisition was funded primarily using available cash. Concurrently with the closing, the joint venture repaid in full the property’s $ 74.7 million mortgage loan and obtained a new loan collateralized by the property in the amount of $ 117 million, which bears interest at 4.2 percent and matures in August 2026 . The Company received $ 43.3 million in distribution from the loan proceeds which was used to acquire the equity partner’s 50 percent interest. As the result of the acquisition, the Company increased its ownership of the property from a 24.27 percent subordinated interest to a 74.27 percent controlling interest. In accordance with ASC 810, Consolidation, the Company evaluated the acquisition and determined that the entity meets the criteria of a VIE. As such, the Company consolidated the asset upon acquisition and accordingly, remeasured its equity interests, as required by the FASB’s consolidation guidance, at fair value (based upon the income approach using current rental rates and market cap rates and discount rates). As a result, the Company recorded a gain on change of control of interests of $ 13.8 million (a non-cash item) in the year ended December 31, 2019, in which the Company accounted for the transaction as a VIE that is not a business in accordance with ASC 810-10-30-4. Additional non-cash items included in the acquisition were the Company’s carrying value of its interest in the joint venture of $ 15.3 million and the noncontrolling interest’s fair value of $ 13.7 million. See Note 9: Mortgages, Loans Payable and Other Obligations. Marbella II Land and leasehold interests $ 36,595 Buildings and improvements and other assets, net 153,974 In-place lease values (a) 4,611 Less: Below market lease values (a) ( 80 ) 195,100 Less: Debt ( 117,000 ) Net assets 78,100 Less: Noncontrolling interests ( 13,722 ) Net assets recorded upon consolidation $ 64,378 (a) In-place and below market lease values are being amortized over a weighted-average term of 6.2 months.
Schedule Of Property Disposals	Real Estate Held for Sale/Discontinued Operations/Dispositions 2020 On December 19, 2019, the Company announced that its Board had determined to sell the Company’s entire suburban New Jersey office portfolio totaling approximately 6.6 million square feet, which excludes the Company’s office properties in Jersey City and Hoboken, New Jersey, (collectively, the “Suburban Office Portfolio”). As the decision to sell the Suburban Office Portfolio represented a strategic shift in the Company’s operations, these properties’ results (other than a property classified as held for sale) are being classified as discontinued operations for all periods presented herein. As of December 31, 2020, the Company determined that a 350,000 square foot office property in the Suburban Office Portfolio, located in Holmdel, New Jersey no longer met the held for sale criteria. The property had originally been classified as held for sale as of December 31, 2019. The reclassified property has an aggregate book value of $ 19.8 million as of December 31, 2020, net of accumulated depreciation of $ 10.5 million (including catch-up depreciation). $ 2.8 million of previously recorded valuation allowance was reversed upon the reclassification of the asset from held for sale at December 31, 2020, and the corresponding property’s results and valuation allowance are also reclassified out of discontinued operations to continuing operations for all periods presented. See Note 7: Discontinued Operations. In late 2019 through December 31, 2020, the Company completed the sale of 20 of these suburban office properties, totaling 3.2 million square feet, for net sales proceeds of $ 377.4 million. As of December 31, 2020, the Company has identified as held for sale 16 office properties (comprised of six identified disposal groups) in the Suburban Office Portfolio, totaling 3.0 million square feet (of which the Company currently has 15 properties totaling 2.8 million square feet under contract for sale for aggregate gross proceeds of $ 652.4 million). As a result of a signed contract to dispose of a portfolio of four of the properties in an identified disposal group of assets held for sale, the Company may need to pay for significant costs to defease the mortgage loan encumbering the properties, which will be expensed when incurred at the time of such defeasance. See Note 10: Mortgages, loans payable and other obligations. I n January 2021, the Company completed the sale of one of the properties held for sale, which was a 149,600 square foot office property, for a gross sales price of $ 38 million. See Note 7: Discontinued Operations. The Company plans to complete the sale of substantially all of its remaining Suburban Office Portfolio properties in 2021, and to use the available sales proceeds to pay down its corporate-level, unsecured indebtedness. However, the Company cannot predict whether or to what extent the timing of these sales and the expected amount may be impacted by the ongoing coronavirus pandemic (“COVID-19”). After the completion of the Suburban Office Portfolio sales, the Company’s holdings will consist of its waterfront class A office portfolio and its multi-family rental portfolio, and related development projects and land holdings. Additionally, the Company also identified a retail pad leased to others and several developable land parcels as held for sale as of December 31, 2020. The properties are located in Parsippany, Madison, Short Hills, Edison and Red Bank, New Jersey. As a result of recent sales contract amendments and after considering the current market conditions as a result of the challenging economic climate with the current worldwide COVID-19 pandemic, the Company determined that the carrying value of six of the remaining held for sale properties (comprised of three disposal groups), and several land parcels held for sale was not expected to be recovered from estimated net sales proceeds, and accordingly, during the year ended December 31, 2020, recognized an unrealized loss allowance of $ 15.7 million for the properties ($ 14 million of which are from discontinued operations), respectively, and also recorded land and other impairments of $ 9.5 million. As of December 31, 2020, the Company determined that two developable land parcels located in Parsippany, New Jersey were no longer being held for sale. The properties had originally been classified as held for sale as of December 31, 2019. The reclassified properties had an aggregate book value of $ 11.3 million. The following table summarizes the real estate held for sale, net, and other assets and liabilities (dollars in thousands) : Suburban Other Office Assets Portfolio (a) Held for Sale Total Land $ 87,815 $ 76,396 $ 164,211 Building & Other 737,669 42,202 779,871 Less: Accumulated depreciation ( 161,040 ) ( 7,991 ) ( 169,031 ) Less: Cumulative unrealized losses on property held for sale ( 77,357 ) ( 40,731 ) ( 118,088 ) Real estate held for sale, net $ 587,087 $ 69,876 $ 656,963 Suburban Other Office Assets Other assets and liabilities Portfolio (a) Held for Sale Total Unbilled rents receivable, net (b) $ 17,216 $ 2,102 $ 19,318 Deferred charges, net (b) 15,320 661 15,981 Total intangibles, net (b) 26,069 - 26,069 Total deferred charges & other assets, net 42,513 665 43,178 Mortgages & loans payable, net (b) 123,768 - 123,768 Total below market liability (b) 6,538 - 6,538 Accounts payable, accrued exp & other liability 16,972 80 17,052 Unearned rents/deferred rental income (b) 8,422 217 8,639 (a) Classified as discontinued operations at December 31, 2020 for all periods presented. See Note 7: Discontinued Operations. (b) Expected to be removed with the completion of the sales. The Company disposed of the following rental properties during the year ended December 31, 2020 (dollars in thousands) : Discontinued Operations: Realized Realized Gains Gains Rentable Net Net (losses)/ (losses)/ Disposition # of Square Property Sales Carrying Unrealized Unrealized Date Property/Address Location Bldgs. Feet/Units Type Proceeds Value Losses, net Losses, net 03/17/20 One Bridge Plaza Fort Lee, New Jersey 1 200,000 Office $ 35,065 $ 17,743 $ - $ 17,322 07/22/20 3 Giralda Farms (a) Madison, New Jersey 1 141,000 Office 7,510 9,534 - ( 2,024 ) 09/15/20 Morris portfolio (b) Parsippany and Madison, New Jersey 10 1,448,420 Office 155,116 175,772 - ( 20,656 ) 09/18/20 325 Columbia Turnpike Florham Park, New Jersey 1 168,144 Office 24,276 8,020 - 16,256 09/24/20 9 Campus Drive (c) Parsippany, New Jersey 1 156,945 Office 20,678 22,162 - ( 1,484 ) 10/21/20 3&5 Vaughn Drive Princeton, New Jersey 1 98,500 Office 7,282 5,754 - 1,528 11/18/20 7 Campus Drive (d) Parsippany, New Jersey 1 154,395 Office 12,278 11,804 - 474 12/03/20 581 Main Street Woodbridge, New Jersey 1 200,000 Office 58,400 43,113 - 15,287 12/22/20 500 College Road (e) Princeton, New Jersey 1 158,235 Office 4,582 6,044 - ( 1,462 ) 12/23/20 5/10 Dennis St and and 100 Hiram Sq New Brunswick, New Jersey 2 200 units Multi-Family 45,567 38,404 7,163 - Sub-total 20 2,725,639 370,754 338,350 7,163 25,241 Unrealized losses on real estate held for sale ( 1,682 ) ( 14,040 ) Totals 20 2,725,639 $ 370,754 $ 338,350 $ 5,481 $ 11,201 (a) The Company recorded valuation allowances of $ 2.0 million on the held for sale property during the year ended December 31, 2020 and of $ 16.7 million during the year ended December 31, 2019. (b) The Company recorded valuation allowances of $ 21.6 million on the held for sale properties during the year ended December 31, 2020 and of $ 32.5 million during the year ended December 31, 2019. (c) The Company recorded a valuation allowance of $ 3.5 million on this property during the year ended December 31, 2019. (d) The Company recorded valuation allowance of $ 6.0 million on the held for sale property during the year ended December 31, 2019. (e) The Company recorded valuation allowance of $ 1.9 million on the held for sale property during the year ended December 31, 2020. The Company disposed of the following developable land holdings during the year ended December 31, 2020 (dollars in thousands): Realized Gains Net Net (losses)/ Disposition Sales Carrying Unrealized Date Property Address Location Proceeds Value Losses, net 01/03/20 230 & 250 Half Mile Road Middletown, New Jersey $ 7,018 $ 2,969 $ 4,049 03/27/20 Capital Office Park land Greenbelt, Maryland 8,974 8,210 764 12/18/20 14 & 16 Skyline Drive Mount Pleasant, New York 2,925 1,951 974 Totals $ 18,917 $ 13,130 $ 5,787 2019 On December 19, 2019, the Company announced that, based on the recommendations of the Shareholder Value Committee, its Board had determined to sell the Suburban Office Portfolio. As the decision to sell the Suburban Office Portfolio represented a strategic shift in the Company’s operations, the portfolio’s results are being classified as discontinued operations for all periods presented herein. See Note 7: Discontinued Operations. During the year ended December 31, 2019, the Company completed the sale of two of these suburban office properties, totaling 497,000 square feet, for net sales proceeds of $ 52.2 million. As of December 31, 2019, the Company identified as held for sale the remaining 35 office properties (comprised of 12 identified disposal groups) in the Suburban Office Portfolio, totaling 6.1 million square feet. See Note 7: Discontinued Operations. Additionally, the Company also identified a retail pad leased to others and several developable land parcels as held for sale as of December 31, 2019. The properties are located in Fort Lee, Parsippany, Madison, Short Hills, Edison, Red Bank and Florham Park. The Company determined that the carrying value of 21 of the properties (comprised of six disposal groups) and several land parcels held for sale was not expected to be recovered from estimated net sales proceeds, and accordingly, during the year ended December 31, 2019, recognized an unrealized loss allowance of $ 174.1 million ($ 137.9 million of which are from discontinued operations, for the properties and land and other impairments of $ 32.4 million. The following table summarizes the real estate held for sale, net, and other assets and liabilities (dollars in thousands) : Suburban Other Office Assets Portfolio (a) Held for Sale Total Land $ 147,590 $ 87,663 $ 235,253 Building & Other 1,263,738 54,392 1,318,130 Less: Accumulated depreciation ( 401,212 ) ( 11,573 ) ( 412,785 ) Less: Cumulative unrealized losses on property held for sale ( 137,876 ) ( 36,225 ) ( 174,101 ) Real estate held for sale, net $ 872,240 $ 94,257 $ 966,497 Suburban Other Office Assets Other assets and liabilities Portfolio (a) Held for Sale Total Unbilled rents receivable, net (b) $ 30,188 $ 1,956 $ 32,144 Deferred charges, net (b) 32,900 1,432 34,332 Total intangibles, net (b) 33,095 - 33,095 Total deferred charges & other assets, net 68,684 1,730 70,414 Mortgages & loans payable, net (b) 123,650 - 123,650 Total below market liability (b) 8,833 - 8,833 Accounts payable, accrued exp & other liability 21,025 1,792 22,817 Unearned rents/deferred rental income (b) 2,952 - 2,952 (a) Classified as discontinued operations at December 31, 2019 for all periods presented. See Note 7: Discontinued Operations. (b) Expected to be removed with the completion of the sales. The Company disposed of the following rental properties during the year ended December 31, 2019 (dollars in thousands): Discontinued Operations: Realized Realized Gains Gains Rentable Net Net (losses)/ (losses)/ Disposition # of Square Property Sales Carrying Unrealized Unrealized Date Property/Address Location Bldgs. Feet/Units Type Proceeds Value Losses, net Losses, net 01/11/19 721 Route 202-206 South (a) Bridgewater, New Jersey 1 192,741 Office $ 5,651 $ 5,410 $ 241 $ - 01/16/19 Park Square Apartments (b) Rahway, New Jersey 1 159 units Multi-family 34,045 34,032 13 - 01/22/19 2115 Linwood Avenue Fort Lee, New Jersey 1 68,000 Office 15,197 7,433 7,764 - 02/27/19 201 Littleton Road (c) Morris Plains, New Jersey 1 88,369 Office 4,842 4,937 ( 95 ) - 03/13/19 320 & 321 University Avenue Newark, New Jersey 2 147,406 Office 25,552 18,456 7,096 - 03/29/19 Flex portfolio (d) New York and Connecticut 56 3,148,512 Office/Flex 470,348 214,758 255,590 - 06/18/19 650 From Road (e) Paramus, New Jersey 1 348,510 Office 37,801 40,046 ( 2,245 ) - 10/18/19 3600 Route 66 (h) Neptune, New Jersey 1 180,000 Office 25,237 17,246 - 7,991 10/23/19 Chase & Alterra Portfolio (f) Revere and Malden, Massachusetts 3 1,386 units Multi-family 406,817 293,030 113,787 - 12/06/19 5 Wood Hollow Road (g) (h) Parsippany, New Jersey 1 317,040 Office 26,937 33,226 - ( 6,289 ) (i) Sub-total 68 4,490,578 1,052,427 668,574 382,151 1,702 Unrealized losses on real estate held for sale ( 39,049 ) ( 135,052 ) (i) Totals 68 4,490,578 $ 1,052,427 $ 668,574 $ 343,102 $ ( 133,350 ) (a) The Company recorded a valuation allowance of $ 9.3 million on this property during the year ended December 31, 2018. (b) The Company recorded a valuation allowance of $ 6.3 million on this property during the year ended December 31, 2018. (c) The Company recorded a valuation allowance of $ 3.6 million on this property during the year ended December 31, 2018. (d) As part of the consideration from the buyer, who is a noncontrolling interest unitholder of the Operating Partnership, 301,638 Common Units were redeemed by the Company at fair market value of $ 6.6 million as purchase consideration received for two of the properties disposed of in this transaction, which was a non-cash portion of this sales transaction. The Company used the net cash received at closing to repay approximately $ 119.9 million of borrowings under the unsecured revolving credit facility and to repay $ 90 million of its $ 350 million unsecured term loan. The Company also utilized $ 217.4 million of these proceeds on April 1, 2019 to acquire a 377 -unit multi-family property located in Jersey City, New Jersey. (e) The Company recorded a valuation allowance of $ 0.9 million on this property during the year ended December 31, 2018. (f) Proceeds from the sale, which were net of $ 235.8 million of in-place mortgages assumed by the buyer, were used primarily to repay outstanding borrowings under the Company's revolving credit facility that were drawn to fund a portion of the Company's purchase of Liberty Towers. The assumed mortgages were a non-cash portion of this sales transaction. (g) The net sale proceeds were held by a qualified intermediary, which is noncash and recorded in deferred charges, goodwill and other assets as of December 31, 2019. See Note 5: Deferred Charges, Goodwill and Other Assets, Net – to the Financial Statements. The Company recorded an impairment charge of $ 5.8 million at June 30, 2019 before the property was identified as held for sale on September 30, 2019. (h) These pertain to properties classified as discontinued operations. (See Note 7: Discontinued Operations – to the Financial Statements) (i) These include impairments recorded on three properties before they were classified as discontinued operations. The Company disposed of the following developable land holdings during the year ended December 31, 2019 (dollars in thousands): Realized Gains Net Net (losses)/ Disposition Sales Carrying Unrealized Date Property Address Location Proceeds Value Losses, net 04/30/19 Overlook Ridge Revere, Massachusetts $ 685 $ 415 $ 270 09/20/19 Overlook Ridge Revere, Massachusetts 1,135 839 296 11/08/19 150 Monument Street Bala Cynwd, Pennsylvania (a) 8,374 7,874 500 12/19/19 51 Washington Street Conshohocken, Pennsylvania (b) 8,189 8,732 $ ( 543 ) Totals $ 18,383 $ 17,860 $ 523 (a) The Company recorded a land impairment charge of $ 10.9 million on this land parcel during the year ended December 31, 2018. (b) The Company recorded a land impairment charge of $ 13.6 million on this land parcel during the year ended December 31, 2018. The Company recorded additional land impairment charges of $ 2.7 million on this land parcel during the year ended December 31, 2019 prior to its disposition.

Investments In Unconsolidated_2

Investments In Unconsolidated Joint Ventures (Tables)	12 Months Ended
	Dec. 31, 2020
Investments In Unconsolidated Joint Ventures [Line Items]
Summary Of Unconsolidated Joint Ventures	Property Debt Number of Company's Carrying Value As of December 31, 2020 Apartment Units Effective December 31, December 31, Maturity Interest Entity / Property Name or Rentable SF Ownership % (a) 2020 2019 Balance Date Rate Multi-family Metropolitan and Lofts at 40 Park (b) (c) 189 units 25.00 % $ 3,347 $ 7,257 $ 60,767 (d) (d) RiverTrace at Port Imperial 316 units 22.50 % 6,667 7,463 82,000 11/10/26 3.21 % Crystal House (e) 825 units 25.00 % - 28,823 - - - PI North - Riverwalk C (f) 360 units 40.00 % 36,992 35,527 75,569 12/06/21 L+ 2.75 % Riverpark at Harrison (g) 141 units 45.00 % 681 1,015 30,192 07/01/35 3.19 % Station House 378 units 50.00 % 34,026 35,676 95,137 07/01/33 4.82 % Urby at Harborside (h) 762 units 85.00 % 72,752 79,790 192,000 08/01/29 5.197 % PI North - Land (b) (i) 771 potential units 20.00 % 1,678 1,678 - - - Liberty Landing 850 potential units 50.00 % 337 337 - - - Hillsborough 206 (m) 160,000 sf 50.00 % - 1,962 - - - Office 12 Vreeland Road 139,750 sf 50.00 % 1,811 (j) 3,846 (j) 4,582 07/01/23 2.87 % Offices at Crystal Lake 106,345 sf 31.25 % 3,744 3,521 2,532 11/01/23 4.76 % Other Riverwalk Retail (k) 30,745 sf 20.00 % - 1,467 - - - Hyatt Regency Hotel Jersey City 351 rooms 50.00 % - - 100,000 10/01/26 3.668 % Other (l) 347 729 - - - Totals: $ 162,382 $ 209,091 $ 642,779 (a) Company's effective ownership % represents the Company's entitlement to residual distributions after payments of priority returns, where applicable. (b) The Company's ownership interests in this venture are subordinate to its partner's preferred capital balance and the Company is not expected to meaningfully participate in the venture's cash flows in the near term. (c) Through the joint venture, the Company also owns a 25 percent interest in a 50,973 square feet retail building ("Shops at 40 Park") and a 50 percent interest in a 59 -unit, five story multi-family rental property ("Lofts at 40 Park"). (d) Property debt balance consists of: (i) an interest only loan, collateralized by the Metropolitan at 40 Park, refinanced on September 18, 2020, with a balance of $ 36,500 , bears interest at LIBOR + 2.85 percent, matures in October 2023 ; (ii) an amortizable loan, collateralized by the Shops at 40 Park, with a balance of $ 6,067 , bears interest at LIBOR + 1.5 percent and matures in October 2021 ; (iii) an interest only loan, collateralized by the Lofts at 40 Park, with a balance of $ 18,200 , which bears interest at LIBOR + 1.5 percent and matures in January 2023 . (e) On December 31, 2020, the Crystal House Apartment Investors LLC, an unconsolidated joint venture property sold its sole apartment property and the Company recorded a gain of $ 35.1 million. See Note 3: Recent Transactions - Unconsolidated Joint Venture. (f) The venture has a construction loan with a maximum borrowing amount of $ 112,000 , of which the Company has guaranteed 10 percent of the principal outstanding. (g) On June 10, 2020, the loan was refinanced with a borrowing amount of $ 30,192 . (h) The Company owns an 85 percent interest with shared control over major decisions such as, approval of budgets, property financings and leasing guidelines. The Company has guaranteed $ 22 million of the principal outstanding debt. (i) The Company owns a 20 percent residual interest in undeveloped land parcels: parcels 6, I, and J that can accommodate the development of 771 apartment units. (j) At December 31, 2019, the Company evaluated the recoverability of the carrying value of certain investments in unconsolidated joint venture, being considered for sale in the short or medium term. The Company determined that due to tenant turnover, lease-up assumptions, along with the Company's plans to exit its investment, it was necessary to reduce the carrying value of the investment to its estimated fair value. Accordingly, the Company recorded an impairment charge of $ 2.6 million and $ 3.7 million at December 31, 2020 and 2019, respectively. (k) On March 12, 2020, the Company acquired its equity partner's 80 percent interest and increased ownership to 100 percent. See Note 3: Recent Transactions - Consolidation. (l) The Company owns other interests in various unconsolidated joint ventures, including interests in assets previously owned and interest in ventures whose businesses are related to its core operations. These ventures are not expected to significantly impact the Company's operations in the near term. (m) On December 17, 2020, the Company sold its interest in the joint venture for a sale price of $ 2.1 million and recorded a gain of $ 0.1 million.
Summary Of Company's Equity In Earnings (Loss) Of Unconsolidated Joint Ventures	Year Ended December 31, Entity / Property Name 2020 2019 2018 Multi-family Marbella $ - $ - $ 205 Metropolitan at 40 Park ( 1,010 ) ( 422 ) ( 455 ) RiverTrace at Port Imperial 111 317 154 Crystal House ( 924 ) ( 687 ) ( 874 ) PI North - Riverwalk C / Land ( 368 ) ( 279 ) ( 126 ) Marbella II (b) - ( 15 ) 35 Riverpark at Harrison ( 273 ) ( 172 ) ( 232 ) Station House ( 1,650 ) ( 2,000 ) ( 2,096 ) Urby at Harborside 1,095 (c) 1,587 (c) ( 975 ) (c) Liberty Landing ( 5 ) - ( 5 ) Hillsborough 206 - - 16 Office Red Bank (d) - 8 ( 215 ) 12 Vreeland Road ( 2,035 ) ( 3,172 ) 285 Offices at Crystal Lake 224 79 73 Other Riverwalk Retail (e) ( 10 ) ( 72 ) ( 86 ) Hyatt Regency Hotel Jersey City 625 3,388 3,672 Other 388 121 497 Company's equity in earnings (loss) of unconsolidated joint ventures (a) $ ( 3,832 ) $ ( 1,319 ) $ ( 127 ) (a) Amounts are net of amortization of basis differences of $ 581 and $ 638 for the year ended December 31, 2020 and 2019, respectively. (b) On January 31, 2019, the Company acquired one of its equity partner's 50 percent interest and as a result, increased its ownership from 24.27 percent subordinated interest to 74.27 percent controlling interest, and ceased applying the equity method of accounting at such time. (c) Includes $ 2.6 million of the Company's share of the venture's income from its sale of an economic urban tax credit certificate from the State of New Jersey to a third party. The venture has an agreement to sell tax credits to a third party over the next seven years for $ 3 million per year for a total of $ 21 million. The sales are subject to the venture obtaining the tax credits from the State of New Jersey each year and transferring the tax credit certificate to the buyer each year. (d) On February 28, 2019, the Company sold its 50 percent interest to its partner and realized a gain of $ 0.9 million. (e) On March 12, 2020, the Company acquired its equity partner's 80 percent interest and increased ownership to 100 percent. See Note 3: Recent Transactions - Consolidation.
Mack-Cali Realty LP [Member]
Investments In Unconsolidated Joint Ventures [Line Items]
Summary Of Unconsolidated Joint Ventures	Property Debt Number of Company's Carrying Value As of December 31, 2020 Apartment Units Effective December 31, December 31, Maturity Interest Entity / Property Name or Rentable SF Ownership % (a) 2020 2019 Balance Date Rate Multi-family Metropolitan and Lofts at 40 Park (b) (c) 189 units 25.00 % $ 3,347 $ 7,257 $ 60,767 (d) (d) RiverTrace at Port Imperial 316 units 22.50 % 6,667 7,463 82,000 11/10/26 3.21 % Crystal House (e) 825 units 25.00 % - 28,823 - - - PI North - Riverwalk C (f) 360 units 40.00 % 36,992 35,527 75,569 12/06/21 L+ 2.75 % Riverpark at Harrison (g) 141 units 45.00 % 681 1,015 30,192 07/01/35 3.19 % Station House 378 units 50.00 % 34,026 35,676 95,137 07/01/33 4.82 % Urby at Harborside (h) 762 units 85.00 % 72,752 79,790 192,000 08/01/29 5.197 % PI North - Land (b) (i) 771 potential units 20.00 % 1,678 1,678 - - - Liberty Landing 850 potential units 50.00 % 337 337 - - - Hillsborough 206 (m) 160,000 sf 50.00 % - 1,962 - - - Office 12 Vreeland Road 139,750 sf 50.00 % 1,811 (j) 3,846 (j) 4,582 07/01/23 2.87 % Offices at Crystal Lake 106,345 sf 31.25 % 3,744 3,521 2,532 11/01/23 4.76 % Other Riverwalk Retail (k) 30,745 sf 20.00 % - 1,467 - - - Hyatt Regency Hotel Jersey City 351 rooms 50.00 % - - 100,000 10/01/26 3.668 % Other (l) 347 729 - - - Totals: $ 162,382 $ 209,091 $ 642,779 (a) Company's effective ownership % represents the Company's entitlement to residual distributions after payments of priority returns, where applicable. (b) The Company's ownership interests in this venture are subordinate to its partner's preferred capital balance and the Company is not expected to meaningfully participate in the venture's cash flows in the near term. (c) Through the joint venture, the Company also owns a 25 percent interest in a 50,973 square feet retail building ("Shops at 40 Park") and a 50 percent interest in a 59 -unit, five story multi-family rental property ("Lofts at 40 Park"). (d) Property debt balance consists of: (i) an interest only loan, collateralized by the Metropolitan at 40 Park, refinanced on September 18, 2020, with a balance of $ 36,500 , bears interest at LIBOR + 2.85 percent, matures in October 2023 ; (ii) an amortizable loan, collateralized by the Shops at 40 Park, with a balance of $ 6,067 , bears interest at LIBOR + 1.5 percent and matures in October 2021 ; (iii) an interest only loan, collateralized by the Lofts at 40 Park, with a balance of $ 18,200 , which bears interest at LIBOR + 1.5 percent and matures in January 2023 . (e) On December 31, 2020, the Crystal House Apartment Investors LLC, an unconsolidated joint venture property sold its sole apartment property and the Company recorded a gain of $ 35.1 million. See Note 3: Recent Transactions - Unconsolidated Joint Venture. (f) The venture has a construction loan with a maximum borrowing amount of $ 112,000 , of which the Company has guaranteed 10 percent of the principal outstanding. (g) On June 10, 2020, the loan was refinanced with a borrowing amount of $ 30,192 . (h) The Company owns an 85 percent interest with shared control over major decisions such as, approval of budgets, property financings and leasing guidelines. The Company has guaranteed $ 22 million of the principal outstanding debt. (i) The Company owns a 20 percent residual interest in undeveloped land parcels: parcels 6, I, and J that can accommodate the development of 771 apartment units. (j) At December 31, 2019, the Company evaluated the recoverability of the carrying value of certain investments in unconsolidated joint venture, being considered for sale in the short or medium term. The Company determined that due to tenant turnover, lease-up assumptions, along with the Company's plans to exit its investment, it was necessary to reduce the carrying value of the investment to its estimated fair value. Accordingly, the Company recorded an impairment charge of $ 2.6 million and $ 3.7 million at December 31, 2020 and 2019, respectively. (k) On March 12, 2020, the Company acquired its equity partner's 80 percent interest and increased ownership to 100 percent. See Note 3: Recent Transactions - Consolidation. (l) The Company owns other interests in various unconsolidated joint ventures, including interests in assets previously owned and interest in ventures whose businesses are related to its core operations. These ventures are not expected to significantly impact the Company's operations in the near term. (m) On December 17, 2020, the Company sold its interest in the joint venture for a sale price of $ 2.1 million and recorded a gain of $ 0.1 million.
Summary Of Company's Equity In Earnings (Loss) Of Unconsolidated Joint Ventures	Year Ended December 31, Entity / Property Name 2020 2019 2018 Multi-family Marbella $ - $ - $ 205 Metropolitan at 40 Park ( 1,010 ) ( 422 ) ( 455 ) RiverTrace at Port Imperial 111 317 154 Crystal House ( 924 ) ( 687 ) ( 874 ) PI North - Riverwalk C / Land ( 368 ) ( 279 ) ( 126 ) Marbella II (b) - ( 15 ) 35 Riverpark at Harrison ( 273 ) ( 172 ) ( 232 ) Station House ( 1,650 ) ( 2,000 ) ( 2,096 ) Urby at Harborside 1,095 (c) 1,587 (c) ( 975 ) (c) Liberty Landing ( 5 ) - ( 5 ) Hillsborough 206 - - 16 Office Red Bank (d) - 8 ( 215 ) 12 Vreeland Road ( 2,035 ) ( 3,172 ) 285 Offices at Crystal Lake 224 79 73 Other Riverwalk Retail (e) ( 10 ) ( 72 ) ( 86 ) Hyatt Regency Hotel Jersey City 625 3,388 3,672 Other 388 121 497 Company's equity in earnings (loss) of unconsolidated joint ventures (a) $ ( 3,832 ) $ ( 1,319 ) $ ( 127 ) (a) Amounts are net of amortization of basis differences of $ 581 and $ 638 for the year ended December 31, 2020 and 2019, respectively. (b) On January 31, 2019, the Company acquired one of its equity partner's 50 percent interest and as a result, increased its ownership from 24.27 percent subordinated interest to 74.27 percent controlling interest, and ceased applying the equity method of accounting at such time. (c) Includes $ 2.6 million of the Company's share of the venture's income from its sale of an economic urban tax credit certificate from the State of New Jersey to a third party. The venture has an agreement to sell tax credits to a third party over the next seven years for $ 3 million per year for a total of $ 21 million. The sales are subject to the venture obtaining the tax credits from the State of New Jersey each year and transferring the tax credit certificate to the buyer each year. (d) On February 28, 2019, the Company sold its 50 percent interest to its partner and realized a gain of $ 0.9 million. (e) On March 12, 2020, the Company acquired its equity partner's 80 percent interest and increased ownership to 100 percent. See Note 3: Recent Transactions - Consolidation.

Deferred Charges, Goodwill An_2

Deferred Charges, Goodwill And Other Assets, Net (Tables)	12 Months Ended
	Dec. 31, 2020
Deferred Charges, Goodwill And Other Assets [Line Items]
Schedule Of Deferred Charges, Goodwill And Other Assets	December 31, December 31, (dollars in thousands) 2020 2019 Deferred leasing costs $ 112,421 $ 142,424 Deferred financing costs - unsecured revolving credit facility (a) 5,559 5,559 117,980 147,983 Accumulated amortization ( 52,428 ) ( 59,522 ) Deferred charges, net 65,552 88,461 Notes receivable (b) 1,167 1,625 In-place lease values, related intangibles and other assets, net (c) (d) 71,608 86,092 Goodwill (e) 2,945 2,945 Right of use assets (f) 22,298 22,604 Prepaid expenses and other assets, net (g) 35,971 73,375 Total deferred charges, goodwill and other assets, net (h) $ 199,541 $ 275,102 (a) Deferred financing costs related to all other debt liabilities (other than for the unsecured revolving credit facility) are netted against those debt liabilities for all periods presented. See Note 2: Significant Accounting Policies – Deferred Financing Costs. (b) Includes as of December 31, 2020 and 2019, respectively, an interest-free note receivable with a net present value of $ 1.2 million and $ 1.6 million, which matures in April 2023 . The Company believes this balance is fully collectible. (c) In accordance with ASC 805, Business Combinations, the Company recognizes rental revenue of acquired above and below market lease intangibles over the terms of the respective leases. The impact of amortizing the acquired above and below-market lease intangibles increased revenue by approximately $ 3.7 million, $ 4.3 million and $ 5.3 million for the years ended December 31, 2020, 2019 and 2018, respectively. The following table summarizes, as of December 31, 2020, the scheduled amortization of the Company’s acquired above and below-market lease intangibles for each of the five succeeding years (dollars in thousands) : Acquired Above- Acquired Below- Market Lease Market Lease Total Year Intangibles Intangibles Amortization 2021 $ ( 1,262 ) $ 4,620 $ 3,358 2022 ( 1,150 ) 4,368 3,218 2023 ( 1,020 ) 3,548 2,528 2024 ( 866 ) 3,080 2,214 2025 ( 391 ) 2,683 2,292 (d) The value of acquired in-place lease intangibles are amortized to expense over the remaining initial terms of the respective leases. The impact of the amortization of acquired in-place lease values is included in depreciation and amortization expense and amounted to approximately $ 9.1 million, $ 34.2 million and $ 17.9 million for the years ended December 31, 2020, 2019 and 2018, respectively. The following table summarizes, as of December 31, 2020, the scheduled amortization of the Company’s acquired in-place lease values for each of the five succeeding years (dollars in thousands) : Year 2021 $ 9,454 2022 8,386 2023 6,271 2024 4,635 2025 2,843 Total $ 31,589 (e) All goodwill is attributable to the Company’s Multi-family Real Estate and Services segment. (f) B alance recorded starting in 2019, pursuant to the Company’s adoption of ASU 2016-02 (Topic 842). This amount has a corresponding liability of $ 23.6 million, which is included in Accounts payable, accrued expense and other liabilities. See Note 12: Commitments and Contingencies – Ground Lease agreements for further details. (g) Includes as of December 31, 2020 and 2019, zero and $ 28.1 million, respectively, of funds available with the Company’s qualified intermediary from prior property sales proceeds. (h) The amount as of December 31, 2020 and 2019, includes $ 42.5 million and $ 68.6 million, respectively, for properties classified as discontinued operations.
Schedule Of Cash Flow Hedging, Derivative Financial Instruments On The Income Statement	Derivatives in Cash Flow Hedging Relationships Amount of Gain or (Loss) Recognized in OCI on Derivative Location of Gain or (Loss) Reclassified from Accumulated OCI into Income Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income Location of Gain or (Loss) Recognized in Income on Derivative Amount of Gain or (Loss) Recognized in Income on Derivative and Reclassification for Forecasted Transactions No Longer Probable of Occurring) Total Amount of Interest Expense presented in the consolidated statements Year ended December 31, 2020 2019 2018 2020 2019 2018 2020 2019 2018 2020 2019 2018 Interest rate swaps $ - $ ( 4,682 ) $ 5,262 Interest expense $ 16 $ 3,551 $ 2,944 Interest and other investment income (loss) $ - $ 1,926 ( 204 ) $ ( 80,991 ) $ ( 90,569 ) $ ( 77,594 )
Acquired Above And Below Market Lease Intangibles [Member]
Deferred Charges, Goodwill And Other Assets [Line Items]
Summary Of Scheduled Amortization	Acquired Above- Acquired Below- Market Lease Market Lease Total Year Intangibles Intangibles Amortization 2021 $ ( 1,262 ) $ 4,620 $ 3,358 2022 ( 1,150 ) 4,368 3,218 2023 ( 1,020 ) 3,548 2,528 2024 ( 866 ) 3,080 2,214 2025 ( 391 ) 2,683 2,292
In-Place Leases [Member]
Deferred Charges, Goodwill And Other Assets [Line Items]
Summary Of Scheduled Amortization	Year 2021 $ 9,454 2022 8,386 2023 6,271 2024 4,635 2025 2,843 Total $ 31,589
Mack-Cali Realty LP [Member]
Deferred Charges, Goodwill And Other Assets [Line Items]
Schedule Of Deferred Charges, Goodwill And Other Assets	December 31, December 31, (dollars in thousands) 2020 2019 Deferred leasing costs $ 112,421 $ 142,424 Deferred financing costs - unsecured revolving credit facility (a) 5,559 5,559 117,980 147,983 Accumulated amortization ( 52,428 ) ( 59,522 ) Deferred charges, net 65,552 88,461 Notes receivable (b) 1,167 1,625 In-place lease values, related intangibles and other assets, net (c) (d) 71,608 86,092 Goodwill (e) 2,945 2,945 Right of use assets (f) 22,298 22,604 Prepaid expenses and other assets, net (g) 35,971 73,375 Total deferred charges, goodwill and other assets, net (h) $ 199,541 $ 275,102 (a) Deferred financing costs related to all other debt liabilities (other than for the unsecured revolving credit facility) are netted against those debt liabilities for all periods presented. See Note 2: Significant Accounting Policies – Deferred Financing Costs. (b) Includes as of December 31, 2020 and 2019, respectively, an interest-free note receivable with a net present value of $ 1.2 million and $ 1.6 million, which matures in April 2023 . The Company believes this balance is fully collectible. (c) In accordance with ASC 805, Business Combinations, the Company recognizes rental revenue of acquired above and below market lease intangibles over the terms of the respective leases. The impact of amortizing the acquired above and below-market lease intangibles increased revenue by approximately $ 3.7 million, $ 4.3 million and $ 5.3 million for the years ended December 31, 2020, 2019 and 2018, respectively. The following table summarizes, as of December 31, 2020, the scheduled amortization of the Company’s acquired above and below-market lease intangibles for each of the five succeeding years (dollars in thousands) : Acquired Above- Acquired Below- Market Lease Market Lease Total Year Intangibles Intangibles Amortization 2021 $ ( 1,262 ) $ 4,620 $ 3,358 2022 ( 1,150 ) 4,368 3,218 2023 ( 1,020 ) 3,548 2,528 2024 ( 866 ) 3,080 2,214 2025 ( 391 ) 2,683 2,292 (d) The value of acquired in-place lease intangibles are amortized to expense over the remaining initial terms of the respective leases. The impact of the amortization of acquired in-place lease values is included in depreciation and amortization expense and amounted to approximately $ 9.1 million, $ 34.2 million and $ 17.9 million for the years ended December 31, 2020, 2019 and 2018, respectively. The following table summarizes, as of December 31, 2020, the scheduled amortization of the Company’s acquired in-place lease values for each of the five succeeding years (dollars in thousands) : Year 2021 $ 9,454 2022 8,386 2023 6,271 2024 4,635 2025 2,843 Total $ 31,589 (e) All goodwill is attributable to the Company’s Multi-family Real Estate and Services segment. (f) B alance recorded starting in 2019, pursuant to the Company’s adoption of ASU 2016-02 (Topic 842). This amount has a corresponding liability of $ 23.6 million, which is included in Accounts payable, accrued expense and other liabilities. See Note 12: Commitments and Contingencies – Ground Lease agreements for further details. (g) Includes as of December 31, 2020 and 2019, zero and $ 28.1 million, respectively, of funds available with the Company’s qualified intermediary from prior property sales proceeds. (h) The amount as of December 31, 2020 and 2019, includes $ 42.5 million and $ 68.6 million, respectively, for properties classified as discontinued operations.
Schedule Of Cash Flow Hedging, Derivative Financial Instruments On The Income Statement	Derivatives in Cash Flow Hedging Relationships Amount of Gain or (Loss) Recognized in OCI on Derivative Location of Gain or (Loss) Reclassified from Accumulated OCI into Income Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income Location of Gain or (Loss) Recognized in Income on Derivative Amount of Gain or (Loss) Recognized in Income on Derivative and Reclassification for Forecasted Transactions No Longer Probable of Occurring) Total Amount of Interest Expense presented in the consolidated statements Year ended December 31, 2020 2019 2018 2020 2019 2018 2020 2019 2018 2020 2019 2018 Interest rate swaps $ - $ ( 4,682 ) $ 5,262 Interest expense $ 16 $ 3,551 $ 2,944 Interest and other investment income (loss) $ - $ 1,926 ( 204 ) $ ( 80,991 ) $ ( 90,569 ) $ ( 77,594 )
Mack-Cali Realty LP [Member] | Acquired Above And Below Market Lease Intangibles [Member]
Deferred Charges, Goodwill And Other Assets [Line Items]
Summary Of Scheduled Amortization	Acquired Above- Acquired Below- Market Lease Market Lease Total Year Intangibles Intangibles Amortization 2021 $ ( 1,262 ) $ 4,620 $ 3,358 2022 ( 1,150 ) 4,368 3,218 2023 ( 1,020 ) 3,548 2,528 2024 ( 866 ) 3,080 2,214 2025 ( 391 ) 2,683 2,292
Mack-Cali Realty LP [Member] | In-Place Leases [Member]
Deferred Charges, Goodwill And Other Assets [Line Items]
Summary Of Scheduled Amortization	Year 2021 $ 9,454 2022 8,386 2023 6,271 2024 4,635 2025 2,843 Total $ 31,589

Restricted Cash (Tables)

Restricted Cash (Tables)	12 Months Ended
	Dec. 31, 2020
Restricted Cash [Line Items]
Schedule Of Restricted Cash	December 31, December 31, 2020 2019 Security deposits $ 5,289 $ 5,677 Escrow and other reserve funds 8,918 9,900 Total restricted cash $ 14,207 $ 15,577
Mack-Cali Realty LP [Member]
Restricted Cash [Line Items]
Schedule Of Restricted Cash	December 31, December 31, 2020 2019 Security deposits $ 5,289 $ 5,677 Escrow and other reserve funds 8,918 9,900 Total restricted cash $ 14,207 $ 15,577

Discontinued Operations (Tables

Discontinued Operations (Tables)	12 Months Ended
	Dec. 31, 2020
Summary Of Income From Discontinued Operations And Related Realized And Unrealized Gains (Losses) (Details)	Year Ended December 31, 2020 2019 2018 Total revenues $ 134,915 $ 169,672 $ 158,881 Operating and other expenses ( 54,129 ) ( 69,045 ) ( 66,528 ) Depreciation and amortization ( 4,806 ) ( 71,021 ) ( 61,029 ) Interest expense ( 5,256 ) ( 5,240 ) ( 5,990 ) Loss from early extinguishment of debt - - ( 1,757 ) Income from discontinued operations 70,724 24,366 23,577 Unrealized losses on disposition of rental property (a) ( 14,040 ) ( 141,266 ) - Realized gains (losses) on disposition of rental property (b) 25,241 7,916 - Realized gains (losses) and unrealized losses on disposition of rental property and impairments, net 11,201 ( 133,350 ) - Total discontinued operations, net $ 81,925 $ ( 108,984 ) $ 23,577 (a) Represents valuation allowances and impairment charges on properties classified as discontinued operations in 2020. (b) See Note 3: Real Estate Transactions – Dispositions for further information regarding properties sold and related gains (losses) .
Mack-Cali Realty LP [Member]
Summary Of Income From Discontinued Operations And Related Realized And Unrealized Gains (Losses) (Details)	Year Ended December 31, 2020 2019 2018 Total revenues $ 134,915 $ 169,672 $ 158,881 Operating and other expenses ( 54,129 ) ( 69,045 ) ( 66,528 ) Depreciation and amortization ( 4,806 ) ( 71,021 ) ( 61,029 ) Interest expense ( 5,256 ) ( 5,240 ) ( 5,990 ) Loss from early extinguishment of debt - - ( 1,757 ) Income from discontinued operations 70,724 24,366 23,577 Unrealized losses on disposition of rental property (a) ( 14,040 ) ( 141,266 ) - Realized gains (losses) on disposition of rental property (b) 25,241 7,916 - Realized gains (losses) and unrealized losses on disposition of rental property and impairments, net 11,201 ( 133,350 ) - Total discontinued operations, net $ 81,925 $ ( 108,984 ) $ 23,577 (a) Represents valuation allowances and impairment charges on properties classified as discontinued operations in 2020. (b) See Note 3: Real Estate Transactions – Dispositions for further information regarding properties sold and related gains (losses) .

Senior Unsecured Notes (Tables)

Senior Unsecured Notes (Tables) - Senior Unsecured Notes [Member]	12 Months Ended
	Dec. 31, 2020
Debt Instrument [Line Items]
Summary Of Senior Unsecured Notes	December 31, December 31, Effective 2020 2019 Rate (1) 4.500 % Senior Unsecured Notes, due April 18, 2022 $ 300,000 $ 300,000 4.612 % 3.150 % Senior Unsecured Notes, due May 15, 2023 275,000 275,000 3.517 % Principal balance outstanding 575,000 575,000 Adjustment for unamortized debt discount ( 1,504 ) ( 2,170 ) Unamortized deferred financing costs ( 843 ) ( 1,346 ) Total senior unsecured notes, net $ 572,653 $ 571,484 (1) Includes the cost of terminated treasury lock agreements (if any), offering and other transaction costs and the discount/premium on the notes, as applicable.
Mack-Cali Realty LP [Member]
Debt Instrument [Line Items]
Summary Of Senior Unsecured Notes	December 31, December 31, Effective 2020 2019 Rate (1) 4.500 % Senior Unsecured Notes, due April 18, 2022 $ 300,000 $ 300,000 4.612 % 3.150 % Senior Unsecured Notes, due May 15, 2023 275,000 275,000 3.517 % Principal balance outstanding 575,000 575,000 Adjustment for unamortized debt discount ( 1,504 ) ( 2,170 ) Unamortized deferred financing costs ( 843 ) ( 1,346 ) Total senior unsecured notes, net $ 572,653 $ 571,484 (1) Includes the cost of terminated treasury lock agreements (if any), offering and other transaction costs and the discount/premium on the notes, as applicable.

Unsecured Revolving Credit Fa_2

Unsecured Revolving Credit Facility And Term Loans (Tables)	12 Months Ended
	Dec. 31, 2020
Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Schedule Of Unsecured Credit Rating And Facility Fee	Operating Partnership's Interest Rate - Unsecured Debt Ratings: Applicable Basis Points Facility Fee Higher of S&P or Moody's Above LIBOR Basis Points No ratings or less than BBB-/Baa3 170.0 35.0 BBB- or Baa3 (since January 2017 amendment) 130.0 30.0 BBB or Baa2 110.0 20.0 BBB+ or Baa1 100.0 15.0 A- or A3 or higher 92.5 12.5
2017 Credit Facility [Member]
Debt Instrument [Line Items]
Schedule Of Defined Leverage Ratio, Including Interest Rate, Alternate Base Rate Loans, And Facility Fee	Interest Rate - Applicable Interest Rate - Basis Points Applicable Above LIBOR for Basis Points Alternate Base Facility Fee Total Leverage Ratio Above LIBOR Rate Loans Basis Points < 45 % 125.0 25.0 20.0 ≥ 45 % and < 50 % 130.0 30.0 25.0 ≥ 50 % and < 55 % (current ratio) 135.0 35.0 30.0 ≥ 55 % 160.0 60.0 35.0
Schedule Of Interest Rates On Outstanding Borrowings, Alternate Base Rate Loans, And Facility Fee	Interest Rate - Applicable Interest Rate - Basis Points Operating Partnership's Applicable Above LIBOR for Unsecured Debt Ratings: Basis Points Alternate Base Facility Fee Higher of S&P or Moody's Above LIBOR Rate Loans Basis Points No ratings or less than BBB-/Baa3 155.0 55.0 30.0 BBB- or Baa3 (interest rate based on Company's election through March 5, 2018) 120.0 20.0 25.0 BBB or Baa2 100.0 0.0 20.0 BBB+ or Baa1 90.0 0.0 15.0 A- or A3 or higher 87.5 0.0 12.5
Mack-Cali Realty LP [Member] | Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Schedule Of Unsecured Credit Rating And Facility Fee	Operating Partnership's Interest Rate - Unsecured Debt Ratings: Applicable Basis Points Facility Fee Higher of S&P or Moody's Above LIBOR Basis Points No ratings or less than BBB-/Baa3 170.0 35.0 BBB- or Baa3 (since January 2017 amendment) 130.0 30.0 BBB or Baa2 110.0 20.0 BBB+ or Baa1 100.0 15.0 A- or A3 or higher 92.5 12.5
Mack-Cali Realty LP [Member] | 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Schedule Of Defined Leverage Ratio, Including Interest Rate, Alternate Base Rate Loans, And Facility Fee	Interest Rate - Applicable Interest Rate - Basis Points Applicable Above LIBOR for Basis Points Alternate Base Facility Fee Total Leverage Ratio Above LIBOR Rate Loans Basis Points < 45 % 125.0 25.0 20.0 ≥ 45 % and < 50 % 130.0 30.0 25.0 ≥ 50 % and < 55 % (current ratio) 135.0 35.0 30.0 ≥ 55 % 160.0 60.0 35.0
Schedule Of Interest Rates On Outstanding Borrowings, Alternate Base Rate Loans, And Facility Fee	Interest Rate - Applicable Interest Rate - Basis Points Operating Partnership's Applicable Above LIBOR for Unsecured Debt Ratings: Basis Points Alternate Base Facility Fee Higher of S&P or Moody's Above LIBOR Rate Loans Basis Points No ratings or less than BBB-/Baa3 155.0 55.0 30.0 BBB- or Baa3 (interest rate based on Company's election through March 5, 2018) 120.0 20.0 25.0 BBB or Baa2 100.0 0.0 20.0 BBB+ or Baa1 90.0 0.0 15.0 A- or A3 or higher 87.5 0.0 12.5
2017 Term Loan [Member]
Debt Instrument [Line Items]
Schedule Of Defined Leverage Ratio	Interest Rate - Applicable Interest Rate - Basis Points Applicable Above LIBOR for Basis Points Alternate Base Rate Total Leverage Ratio above LIBOR Loans < 45 % 145.0 45.0 ≥ 45 % and < 50 % 155.0 55.0 ≥ 50 % and < 55 % (current ratio) 165.0 65.0 ≥ 55 % 195.0 95.0
Schedule Of Interest Rate On Outstanding Borrowings Payable	Interest Rate - Applicable Interest Rate - Basis Points Operating Partnership's Applicable Above LIBOR for Unsecured Debt Ratings: Basis Points Alternate Base Rate Higher of S&P or Moody's Above LIBOR Loans No ratings or less than BBB-/Baa3 185.0 85.0 BBB- or Baa3 (interest rate based on Company's election through March 5, 2018) 140.0 40.0 BBB or Baa2 115.0 15.0 BBB+ or Baa1 100.0 0.0 A- or A3 or higher 90.0 0.0
2017 Term Loan [Member] | Mack-Cali Realty LP [Member]
Debt Instrument [Line Items]
Schedule Of Defined Leverage Ratio	Interest Rate - Applicable Interest Rate - Basis Points Applicable Above LIBOR for Basis Points Alternate Base Rate Total Leverage Ratio above LIBOR Loans < 45 % 145.0 45.0 ≥ 45 % and < 50 % 155.0 55.0 ≥ 50 % and < 55 % (current ratio) 165.0 65.0 ≥ 55 % 195.0 95.0
Schedule Of Interest Rate On Outstanding Borrowings Payable	Interest Rate - Applicable Interest Rate - Basis Points Operating Partnership's Applicable Above LIBOR for Unsecured Debt Ratings: Basis Points Alternate Base Rate Higher of S&P or Moody's Above LIBOR Loans No ratings or less than BBB-/Baa3 185.0 85.0 BBB- or Baa3 (interest rate based on Company's election through March 5, 2018) 140.0 40.0 BBB or Baa2 115.0 15.0 BBB+ or Baa1 100.0 0.0 A- or A3 or higher 90.0 0.0
2016 Term Loan [Member]
Debt Instrument [Line Items]
Schedule Of Defined Leverage Ratio	Interest Rate - Applicable Basis Total Leverage Ratio Points above LIBOR < 45 % 145.0 ≥ 45 % and < 50 % 155.0 ≥ 50 % and < 55 % (current ratio) 165.0 ≥ 55 % 195.0
Schedule Of Interest Rate On Outstanding Borrowings Payable	Operating Partnership's Interest Rate - Unsecured Debt Ratings: Applicable Basis Points Higher of S&P or Moody's Above LIBOR No ratings or less than BBB-/Baa3 185.0 BBB- or Baa3 (interest rate based on Company's election through March 5, 2018) 140.0 BBB or Baa2 115.0 BBB+ or Baa1 100.0 A- or A3 or higher 90.0
2016 Term Loan [Member] | Mack-Cali Realty LP [Member]
Debt Instrument [Line Items]
Schedule Of Defined Leverage Ratio	Interest Rate - Applicable Basis Total Leverage Ratio Points above LIBOR < 45 % 145.0 ≥ 45 % and < 50 % 155.0 ≥ 50 % and < 55 % (current ratio) 165.0 ≥ 55 % 195.0
Schedule Of Interest Rate On Outstanding Borrowings Payable	Operating Partnership's Interest Rate - Unsecured Debt Ratings: Applicable Basis Points Higher of S&P or Moody's Above LIBOR No ratings or less than BBB-/Baa3 185.0 BBB- or Baa3 (interest rate based on Company's election through March 5, 2018) 140.0 BBB or Baa2 115.0 BBB+ or Baa1 100.0 A- or A3 or higher 90.0

Mortgages, Loans Payable And _2

Mortgages, Loans Payable And Other Obligations (Tables)	12 Months Ended
	Dec. 31, 2020
Debt Instrument [Line Items]
Summary Of Mortgages, Loans Payable And Other Obligations	Effective December 31, December 31, Property/Project Name Lender Rate (a) 2020 2019 Maturity Riverwatch Commons New York Community Bank N/A $ - $ 30,000 N/A Port Imperial South 4/5 Retail American General Life & A/G PC 4.56 % 3,866 3,934 12/01/21 Port Imperial 4/5 Hotel (b) Fifth Third Bank LIBOR+3.40 % 94,000 74,000 04/09/22 Port Imperial South 9 (c) Bank of New York Mellon LIBOR+2.13 % 46,357 11,615 12/19/22 Portside 7 CBRE Capital Markets/FreddieMac 3.57 % 58,998 58,998 08/01/23 Short Hills Residential (d) People's United Bank LIBOR+2.15 % 42,459 9,431 03/26/23 250 Johnson Nationwide Life Insurance Company 3.74 % 43,000 43,000 08/01/24 Liberty Towers (e) American General Life Insurance Company 3.37 % 265,000 232,000 10/01/24 The Charlotte (f) QuadReal Finance LIBOR+2.70 % 161,544 5,144 12/01/24 Portside 5/6 (g) New York Life Insurance Company 4.56 % 97,000 97,000 03/10/26 Marbella (BLVD 425) New York Life Insurance Company 4.17 % 131,000 131,000 08/10/26 Marbella II (BLVD 401) New York Life Insurance Company 4.29 % 117,000 117,000 08/10/26 101 Hudson Wells Fargo CMBS 3.20 % 250,000 250,000 10/11/26 Worcester MUFG Union Bank LIBOR+1.84 % 63,000 63,000 12/10/26 Short Hills Portfolio (h) Wells Fargo CMBS 4.15 % 124,500 124,500 04/01/27 150 Main St. Natixis Real Estate Capital LLC 4.48 % 41,000 41,000 08/05/27 Monaco (BLVD 495 N/S) (l) The Northwestern Mutual Life Insurance Co. 2.91 % 165,000 166,752 11/10/27 Port Imperial South 11 The Northwestern Mutual Life Insurance Co. 4.52 % 100,000 100,000 01/10/29 Soho Lofts (i) New York Community Bank 3.77 % 160,000 160,000 07/01/29 111 River St. Athene Annuity and Life Company 3.90 % 150,000 150,000 09/01/29 Port Imperial South 4/5 Garage (j) American General Life & A/G PC 4.85 % 33,138 32,600 12/01/29 Emery at Overlook Ridge (k) New York Community Bank 3.21 % 72,000 24,064 01/01/31 Principal balance outstanding 2,218,862 1,925,038 Unamortized deferred financing costs ( 14,718 ) ( 17,004 ) Total mortgages, loans payable and other obligations, net $ 2,204,144 $ 1,908,034 (a) Reflects effective rate of debt, including deferred financing costs, comprised of the cost of terminated treasury lock agreements (if any), debt initiation costs, mark-to-market adjustment of acquired debt and other transaction costs, as applicable. (b) The loan required an initial debt service coverage test for quarter ended September 30, 2020. Subsequent to September 30, 2020, the Company executed an agreement moving the initial debt service coverage test to March 31, 2021. The Company has guaranteed $ 19.5 million of the outstanding principal, subject to certain conditions. (c) This construction loan has a maximum borrowing capacity of $ 92 million and provides, subject to certain conditions, and a one year extension option with a fee of 15 basis points, of which the Company has guaranteed 10 percent of the outstanding principal, subject to certain conditions. (d) This construction loan has a maximum borrowing capacity of $ 64 million and provides, subject to certain conditions, and an 18 month extension option with a fee of 30 basis points, of which the Company has guaranteed 15 percent of the outstanding principal, subject to certain conditions. (e) In January 2020, the Company increased the size of the loan on Liberty Towers to $ 265 million, generating $ 33 million of additional proceeds. (f) This construction loan has a LIBOR floor of 2.0 percent, has a maximum borrowing capacity of $ 300 million and provides, subject to certain conditions, one one year extension option with a fee of 25 basis points. (g) The Company has guaranteed 10 percent of the outstanding principal, subject to certain conditions. (h) Properties, which are collateral for this mortgage loan, are classified as held for sale as of December 31, 2020. This mortgage loan does not permit early pre-payment. As a result of a signed contract to dispose of the properties, which are collateral for this loan, the Company may need to pay for significant costs to defease this loan, which will be expensed when incurred at the time of such defeasance. (i) Effective rate reflects the first five years of interest payments at a fixed rate. Interest payments after that period ends are based on LIBOR plus 2.75 % annually. (j) The loan was modified to defer interest and principal payments for a six month period ending December 1, 2020 . As of December 31, 2020, deferred interest of $ 0.8 million has been added to the principal balance. (k) In December 2020, the Company obtained a new $ 72 million mortgage loan collateralized by the Emery that matures on January 1, 2031 and received net loan proceeds of $ 10.4 million after repaying its construction loan. (l) In November 2020, the Company modified this mortgage loan, extending the maturity date from February 2021 to November 2027 .
Schedule Of Principal Payments	Scheduled Principal Period Amortization Maturities Total 2021 $ 590 $ 28,800 $ 29,390 2022 550 440,357 440,907 2023 2,047 376,457 378,504 2024 3,403 469,545 472,948 2025 3,300 - 3,300 2026 12,822 658,000 670,822 Thereafter - 822,991 822,991 Sub-total 22,712 2,796,150 2,818,862 Adjustment for unamortized debt discount/premium, net December 31, 2020 ( 1,504 ) - ( 1,504 ) Unamortized deferred financing costs ( 15,561 ) - ( 15,561 ) Totals $ 5,647 $ 2,796,150 $ 2,801,797
Mack-Cali Realty LP [Member]
Debt Instrument [Line Items]
Summary Of Mortgages, Loans Payable And Other Obligations	Effective December 31, December 31, Property/Project Name Lender Rate (a) 2020 2019 Maturity Riverwatch Commons New York Community Bank N/A $ - $ 30,000 N/A Port Imperial South 4/5 Retail American General Life & A/G PC 4.56 % 3,866 3,934 12/01/21 Port Imperial 4/5 Hotel (b) Fifth Third Bank LIBOR+3.40 % 94,000 74,000 04/09/22 Port Imperial South 9 (c) Bank of New York Mellon LIBOR+2.13 % 46,357 11,615 12/19/22 Portside 7 CBRE Capital Markets/FreddieMac 3.57 % 58,998 58,998 08/01/23 Short Hills Residential (d) People's United Bank LIBOR+2.15 % 42,459 9,431 03/26/23 250 Johnson Nationwide Life Insurance Company 3.74 % 43,000 43,000 08/01/24 Liberty Towers (e) American General Life Insurance Company 3.37 % 265,000 232,000 10/01/24 The Charlotte (f) QuadReal Finance LIBOR+2.70 % 161,544 5,144 12/01/24 Portside 5/6 (g) New York Life Insurance Company 4.56 % 97,000 97,000 03/10/26 Marbella (BLVD 425) New York Life Insurance Company 4.17 % 131,000 131,000 08/10/26 Marbella II (BLVD 401) New York Life Insurance Company 4.29 % 117,000 117,000 08/10/26 101 Hudson Wells Fargo CMBS 3.20 % 250,000 250,000 10/11/26 Worcester MUFG Union Bank LIBOR+1.84 % 63,000 63,000 12/10/26 Short Hills Portfolio (h) Wells Fargo CMBS 4.15 % 124,500 124,500 04/01/27 150 Main St. Natixis Real Estate Capital LLC 4.48 % 41,000 41,000 08/05/27 Monaco (BLVD 495 N/S) (l) The Northwestern Mutual Life Insurance Co. 2.91 % 165,000 166,752 11/10/27 Port Imperial South 11 The Northwestern Mutual Life Insurance Co. 4.52 % 100,000 100,000 01/10/29 Soho Lofts (i) New York Community Bank 3.77 % 160,000 160,000 07/01/29 111 River St. Athene Annuity and Life Company 3.90 % 150,000 150,000 09/01/29 Port Imperial South 4/5 Garage (j) American General Life & A/G PC 4.85 % 33,138 32,600 12/01/29 Emery at Overlook Ridge (k) New York Community Bank 3.21 % 72,000 24,064 01/01/31 Principal balance outstanding 2,218,862 1,925,038 Unamortized deferred financing costs ( 14,718 ) ( 17,004 ) Total mortgages, loans payable and other obligations, net $ 2,204,144 $ 1,908,034 (a) Reflects effective rate of debt, including deferred financing costs, comprised of the cost of terminated treasury lock agreements (if any), debt initiation costs, mark-to-market adjustment of acquired debt and other transaction costs, as applicable. (b) The loan required an initial debt service coverage test for quarter ended September 30, 2020. Subsequent to September 30, 2020, the Company executed an agreement moving the initial debt service coverage test to March 31, 2021. The Company has guaranteed $ 19.5 million of the outstanding principal, subject to certain conditions. (c) This construction loan has a maximum borrowing capacity of $ 92 million and provides, subject to certain conditions, and a one year extension option with a fee of 15 basis points, of which the Company has guaranteed 10 percent of the outstanding principal, subject to certain conditions. (d) This construction loan has a maximum borrowing capacity of $ 64 million and provides, subject to certain conditions, and an 18 month extension option with a fee of 30 basis points, of which the Company has guaranteed 15 percent of the outstanding principal, subject to certain conditions. (e) In January 2020, the Company increased the size of the loan on Liberty Towers to $ 265 million, generating $ 33 million of additional proceeds. (f) This construction loan has a LIBOR floor of 2.0 percent, has a maximum borrowing capacity of $ 300 million and provides, subject to certain conditions, one one year extension option with a fee of 25 basis points. (g) The Company has guaranteed 10 percent of the outstanding principal, subject to certain conditions. (h) Properties, which are collateral for this mortgage loan, are classified as held for sale as of December 31, 2020. This mortgage loan does not permit early pre-payment. As a result of a signed contract to dispose of the properties, which are collateral for this loan, the Company may need to pay for significant costs to defease this loan, which will be expensed when incurred at the time of such defeasance. (i) Effective rate reflects the first five years of interest payments at a fixed rate. Interest payments after that period ends are based on LIBOR plus 2.75 % annually. (j) The loan was modified to defer interest and principal payments for a six month period ending December 1, 2020 . As of December 31, 2020, deferred interest of $ 0.8 million has been added to the principal balance. (k) In December 2020, the Company obtained a new $ 72 million mortgage loan collateralized by the Emery that matures on January 1, 2031 and received net loan proceeds of $ 10.4 million after repaying its construction loan. (l) In November 2020, the Company modified this mortgage loan, extending the maturity date from February 2021 to November 2027 .
Schedule Of Principal Payments	Scheduled Principal Period Amortization Maturities Total 2021 $ 590 $ 28,800 $ 29,390 2022 550 440,357 440,907 2023 2,047 376,457 378,504 2024 3,403 469,545 472,948 2025 3,300 - 3,300 2026 12,822 658,000 670,822 Thereafter - 822,991 822,991 Sub-total 22,712 2,796,150 2,818,862 Adjustment for unamortized debt discount/premium, net December 31, 2020 ( 1,504 ) - ( 1,504 ) Unamortized deferred financing costs ( 15,561 ) - ( 15,561 ) Totals $ 5,647 $ 2,796,150 $ 2,801,797

Disclosure Of Fair Value Of A_2

Disclosure Of Fair Value Of Assets And Liabilities (Tables)	12 Months Ended
	Dec. 31, 2020
Fair Value Disclosures [Line Items]
Schedule Of Valuation Techniques And Significant Unobservable Assumptions	Primary Valuation Unobservable Location Range of Description Techniques Assumptions Type Rates Office properties held for sale on which the Company recognized impairment losses or unrealized allowance reversals Discounted cash flows or sale prices per purchase and sale agreements Discount rates Suburban 7.5 % - 10 % Exit Capitalization rates Suburban 7.5 % - 9 % Market rental rates per square foot Suburban $ 27.50 - $ 37.00 Land holdings held for sale and held and used on which the Company recognized impairment losses Developable units and market rate per unit or sale prices per purchase and sale agreements Market rates per residential unit Suburban $ 32,000 - $ 40,000 Market rates per square foot Suburban $ 12.00 Hotel properties on which the Company recognized impairment losses or unrealized allowance reversals Discounted cash flows Discount rate Waterfront 10 % Exit Capitalization rate Waterfront 7.5 %
Mack-Cali Realty LP [Member]
Fair Value Disclosures [Line Items]
Schedule Of Valuation Techniques And Significant Unobservable Assumptions	Primary Valuation Unobservable Location Range of Description Techniques Assumptions Type Rates Office properties held for sale on which the Company recognized impairment losses or unrealized allowance reversals Discounted cash flows or sale prices per purchase and sale agreements Discount rates Suburban 7.5 % - 10 % Exit Capitalization rates Suburban 7.5 % - 9 % Market rental rates per square foot Suburban $ 27.50 - $ 37.00 Land holdings held for sale and held and used on which the Company recognized impairment losses Developable units and market rate per unit or sale prices per purchase and sale agreements Market rates per residential unit Suburban $ 32,000 - $ 40,000 Market rates per square foot Suburban $ 12.00 Hotel properties on which the Company recognized impairment losses or unrealized allowance reversals Discounted cash flows Discount rate Waterfront 10 % Exit Capitalization rate Waterfront 7.5 %

Commitments And Contingencies (

Commitments And Contingencies (Tables)	12 Months Ended
	Dec. 31, 2020
Commitments And Contingencies Disclosure [Line Items]
Future Minimum Rental Payments Of Ground Leases	As of December 31, 2020 Year Amount 2021 $ 1,750 2022 1,750 2023 1,756 2024 1,776 2025 1,742 2026 through 2101 152,980 Total lease payments 161,754 Less: imputed interest ( 138,152 ) Total $ 23,602 As of December 31, 2019 Year Amount 2020 $ 1,750 2021 1,750 2022 1,750 2023 1,756 2024 1,776 2025 through 2098 154,722 Total lease payments 163,504 Less: imputed interest ( 139,748 ) Total $ 23,756
Mack-Cali Realty LP [Member]
Commitments And Contingencies Disclosure [Line Items]
Future Minimum Rental Payments Of Ground Leases	As of December 31, 2020 Year Amount 2021 $ 1,750 2022 1,750 2023 1,756 2024 1,776 2025 1,742 2026 through 2101 152,980 Total lease payments 161,754 Less: imputed interest ( 138,152 ) Total $ 23,602 As of December 31, 2019 Year Amount 2020 $ 1,750 2021 1,750 2022 1,750 2023 1,756 2024 1,776 2025 through 2098 154,722 Total lease payments 163,504 Less: imputed interest ( 139,748 ) Total $ 23,756

Tenant Leases (Tables)

Tenant Leases (Tables)	12 Months Ended
	Dec. 31, 2020
Leases [Line Items]
Future Minimum Rentals To Be Received Under Non-Cancelable Operating Leases	As of December 31, 2020 Year Amount 2021 117,228 2022 114,101 2023 108,406 2024 92,605 2025 88,309 2026 and thereafter 462,920 Total $ 983,569 As of December 31, 2019 Year Amount 2020 $ 115,418 2021 107,027 2022 103,417 2023 99,544 2024 88,082 2025 and thereafter 488,305 Total $ 1,001,793
Mack-Cali Realty LP [Member]
Leases [Line Items]
Future Minimum Rentals To Be Received Under Non-Cancelable Operating Leases	As of December 31, 2020 Year Amount 2021 117,228 2022 114,101 2023 108,406 2024 92,605 2025 88,309 2026 and thereafter 462,920 Total $ 983,569 As of December 31, 2019 Year Amount 2020 $ 115,418 2021 107,027 2022 103,417 2023 99,544 2024 88,082 2025 and thereafter 488,305 Total $ 1,001,793

Redeemable Noncontrolling Int_2

Redeemable Noncontrolling Interests (Tables)	12 Months Ended
	Dec. 31, 2020
Redeemable Noncontrolling Interest [Line Items]
Schedule Of Changes In The Value Of The Redeemable Noncontrolling Interests	Series A and Total A-1 Preferred Rockpoint Redeemable Units Interests Noncontrolling In MCRLP in RRT Interests Balance January 1, 2020 $ 52,324 $ 451,058 $ 503,382 Redeemable Noncontrolling Interests Issued - - - Net 52,324 451,058 503,382 Income Attributed to Noncontrolling Interests 1,820 24,063 25,883 Distributions ( 1,820 ) ( 24,063 ) ( 25,883 ) Other Distributions - ( 3,153 ) ( 3,153 ) Redemption Value Adjustment - 13,068 13,068 Redeemable noncontrolling interests as of December 31, 2020 $ 52,324 $ 460,973 $ 513,297 Series A and Total A-1 Preferred Rockpoint Redeemable Units Interests Noncontrolling In MCRLP in RRT Interests Balance January 1, 2019 $ 52,324 $ 278,135 $ 330,459 Redeemable Noncontrolling Interests Issued (net of new issuance costs of $ 1.5 million) - 143,450 143,450 Net 52,324 421,585 473,909 Income Attributed to Noncontrolling Interests 1,820 20,795 22,615 Distributions ( 1,820 ) ( 20,795 ) ( 22,615 ) Redemption Value Adjustment (including value adjustment attributable to Add On Investment Agreement) - 29,473 29,473 Redeemable noncontrolling interests as of December 31, 2019 $ 52,324 $ 451,058 $ 503,382
Mack-Cali Realty LP [Member]
Redeemable Noncontrolling Interest [Line Items]
Schedule Of Changes In The Value Of The Redeemable Noncontrolling Interests	Series A and Total A-1 Preferred Rockpoint Redeemable Units Interests Noncontrolling In MCRLP in RRT Interests Balance January 1, 2020 $ 52,324 $ 451,058 $ 503,382 Redeemable Noncontrolling Interests Issued - - - Net 52,324 451,058 503,382 Income Attributed to Noncontrolling Interests 1,820 24,063 25,883 Distributions ( 1,820 ) ( 24,063 ) ( 25,883 ) Other Distributions - ( 3,153 ) ( 3,153 ) Redemption Value Adjustment - 13,068 13,068 Redeemable noncontrolling interests as of December 31, 2020 $ 52,324 $ 460,973 $ 513,297 Series A and Total A-1 Preferred Rockpoint Redeemable Units Interests Noncontrolling In MCRLP in RRT Interests Balance January 1, 2019 $ 52,324 $ 278,135 $ 330,459 Redeemable Noncontrolling Interests Issued (net of new issuance costs of $ 1.5 million) - 143,450 143,450 Net 52,324 421,585 473,909 Income Attributed to Noncontrolling Interests 1,820 20,795 22,615 Distributions ( 1,820 ) ( 20,795 ) ( 22,615 ) Redemption Value Adjustment (including value adjustment attributable to Add On Investment Agreement) - 29,473 29,473 Redeemable noncontrolling interests as of December 31, 2019 $ 52,324 $ 451,058 $ 503,382

Mack-Cali Realty Corporation _2

Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Tables)	12 Months Ended
	Dec. 31, 2020
Stockholders Equity [Line Items]
Schedule Of Stock Option Plans	Weighted Aggregate Average Intrinsic Shares Exercise Value Under Options Price $(000’s) Outstanding at January 1, 2018 ($ 17.31 ) 800,000 $ 17.31 $ 3,400 Granted, Lapsed or Cancelled - - Outstanding at December 31, 2018 ($ 17.31 ) 800,000 $ 17.31 1,824 Granted, Lapsed or Cancelled - - Outstanding at December 31, 2019 ($ 17.31 ) 800,000 $ 17.31 4,656 Granted 172,495 14.39 Outstanding at December 31, 2020 ($ 14.39 - $ 17.31 ) 972,495 $ 16.79 $ - Options exercisable at December 31, 2020 972,495 Available for grant at December 31, 2020 717,155
Schedule Of Restricted Stock Awards	Weighted-Average Grant – Date Shares Fair Value Outstanding at January 1, 2018 108,318 $ 25.49 Granted 40,185 20.16 Vested ( 72,502 ) 25.33 Forfeited ( 8,712 ) 25.83 Outstanding at December 31, 2018 67,289 $ 22.43 Granted 42,690 21.08 Vested ( 65,353 ) 22.34 Forfeited ( 1,936 ) 25.83 Outstanding at December 31, 2019 42,690 $ 21.08 Granted 52,974 15.29 Vested ( 42,690 ) 21.08 Forfeited - - Outstanding at December 31, 2020 52,974 $ 15.29
Schedule Of Reconciliation Of Shares Used In Basic EPS Calculation To Shares Used In Diluted EPS Calculation	Year Ended December 31, Computation of Basic EPS 2020 2019 2018 Income (loss) from continuing operations $ ( 115,523 ) $ 252,820 $ 82,824 Add (deduct): Noncontrolling interests in consolidated joint ventures 2,695 3,904 1,216 Add (deduct): Noncontrolling interests in Operating Partnership 13,279 ( 23,720 ) ( 7,127 ) Add (deduct): Redeemable noncontrolling interests ( 25,883 ) ( 22,615 ) ( 13,979 ) Add (deduct): Redemption value adjustment of redeemable noncontrolling interests attributable to common shareholders ( 11,814 ) ( 25,885 ) ( 11,425 ) Income (loss) from continuing operations available to common shareholders ( 137,246 ) 184,504 51,509 Income (loss) from discontinued operations available to common shareholders 74,045 ( 98,528 ) 21,177 Net income (loss) available to common shareholders for basic earnings per share $ ( 63,201 ) $ 85,976 $ 72,686 Weighted average common shares 90,648 90,557 90,388 Basic EPS : Income (loss) from continuing operations available to common shareholders $ ( 1.51 ) $ 2.04 $ 0.57 Income (loss) from discontinued operations available to common shareholders 0.81 ( 1.09 ) 0.23 Net income (loss) available to common shareholders $ ( 0.70 ) $ 0.95 $ 0.80 Year Ended December 31, Computation of Diluted EPS 2020 2019 2018 Net income (loss) from continuing operations available to common shareholders $ ( 137,246 ) $ 184,504 $ 51,509 Add (deduct): Noncontrolling interests in Operating Partnership ( 13,279 ) 23,720 7,127 Add (deduct): Redemption value adjustment of redeemable noncontrolling interests attributable to the Operating Partnership unitholders ( 1,254 ) ( 2,855 ) ( 1,296 ) Income (loss) from continuing operations for diluted earnings per share ( 151,779 ) 205,369 57,340 Income (loss) from discontinued operations for diluted earnings per share 81,925 ( 108,984 ) 23,577 Net income (loss) available for diluted earnings per share $ ( 69,854 ) $ 96,385 $ 80,917 Weighted average common shares 100,260 100,689 100,724 Diluted EPS : Income (loss) from continuing operations available to common shareholders $ ( 1.51 ) $ 2.04 $ 0.57 Income (loss) from discontinued operations available to common shareholders 0.81 ( 1.09 ) 0.23 Net income (loss) available to common shareholders $ ( 0.70 ) $ 0.95 $ 0.80 The following schedule reconciles the weighted average shares used in the basic EPS calculation to the shares used in the diluted EPS calculation (in thousands): Year Ended December 31, 2020 2019 2018 Basic EPS shares 90,648 90,557 90,388 Add: Operating Partnership – common and vested LTIP units 9,612 9,963 10,246 Restricted Stock Awards - - - Stock Options - 169 90 Diluted EPS Shares 100,260 100,689 100,724
Mack-Cali Realty LP [Member]
Stockholders Equity [Line Items]
Schedule Of Stock Option Plans	Weighted Aggregate Average Intrinsic Shares Exercise Value Under Options Price $(000’s) Outstanding at January 1, 2018 ($ 17.31 ) 800,000 $ 17.31 $ 3,400 Granted, Lapsed or Cancelled - - Outstanding at December 31, 2018 ($ 17.31 ) 800,000 $ 17.31 1,824 Granted, Lapsed or Cancelled - - Outstanding at December 31, 2019 ($ 17.31 ) 800,000 $ 17.31 4,656 Granted 172,495 14.39 Outstanding at December 31, 2020 ($ 14.39 - $ 17.31 ) 972,495 $ 16.79 $ - Options exercisable at December 31, 2020 972,495 Available for grant at December 31, 2020 717,155
Schedule Of Restricted Stock Awards	Weighted-Average Grant – Date Shares Fair Value Outstanding at January 1, 2018 108,318 $ 25.49 Granted 40,185 20.16 Vested ( 72,502 ) 25.33 Forfeited ( 8,712 ) 25.83 Outstanding at December 31, 2018 67,289 $ 22.43 Granted 42,690 21.08 Vested ( 65,353 ) 22.34 Forfeited ( 1,936 ) 25.83 Outstanding at December 31, 2019 42,690 $ 21.08 Granted 52,974 15.29 Vested ( 42,690 ) 21.08 Forfeited - - Outstanding at December 31, 2020 52,974 $ 15.29
Schedule Of Reconciliation Of Shares Used In Basic EPS Calculation To Shares Used In Diluted EPS Calculation	Year Ended December 31, Computation of Basic EPU 2020 2019 2018 Income (loss) from continuing operations $ ( 115,523 ) $ 252,820 $ 82,824 Add (deduct): Noncontrolling interests in consolidated joint ventures 2,695 3,904 1,216 Add (deduct): Redeemable noncontrolling interests ( 25,883 ) ( 22,615 ) ( 13,979 ) Add (deduct): Redemption value adjustment of redeemable noncontrolling interests ( 13,068 ) ( 28,740 ) ( 12,721 ) Income (loss) from continuing operations available to unitholders ( 151,779 ) 205,369 57,340 Income (loss) from discontinued operations available to unitholders 81,925 ( 108,984 ) 23,577 Net income (loss) available to common unitholders for basic earnings per unit $ ( 69,854 ) $ 96,385 $ 80,917 Weighted average common units 100,260 100,520 100,634 Basic EPU : Income (loss) from continuing operations available to unitholders $ ( 1.51 ) $ 2.04 $ 0.57 Income (loss) from discontinued operations available to unitholders 0.81 ( 1.09 ) 0.23 Net income (loss) available to common unitholders for basic earnings per unit $ ( 0.70 ) $ 0.95 $ 0.80 Year Ended December 31, Computation of Diluted EPU 2020 2019 2018 Net income (loss) from continuing operations available to common unitholders $ ( 151,779 ) $ 205,369 $ 57,340 Income (loss) from discontinued operations for diluted earnings per unit 81,925 ( 108,984 ) 23,577 Net income (loss) available to common unitholders for diluted earnings per unit $ ( 69,854 ) $ 96,385 $ 80,917 Weighted average common unit 100,260 100,689 100,724 Diluted EPU : Income (loss) from continuing operations available to common unitholders $ ( 1.51 ) $ 2.04 $ 0.57 Income (loss) from discontinued operations available to common unitholders 0.81 ( 1.09 ) 0.23 Net income (loss) available to common unitholders $ ( 0.70 ) $ 0.95 $ 0.80 The following schedule reconciles the weighted average units used in the basic EPU calculation to the units used in the diluted EPU calculation (in thousands) : Year Ended December 31, 2020 2019 2020 Basic EPU units 100,260 100,520 100,634 Add: Restricted Stock Awards - - - Add: Stock Options - 169 90 Diluted EPU Units 100,260 100,689 100,724
AO LTIP Units Award [Member]
Stockholders Equity [Line Items]
Schedule Of Weighted Average Assumptions	AO LTIP Units Expected life (in years) 5.5 - 6.0 Risk-free interest rate 2.6 % Volatility 29.0 % Dividend yield 3.5 %
AO LTIP Units Award [Member] | Mack-Cali Realty LP [Member]
Stockholders Equity [Line Items]
Schedule Of Weighted Average Assumptions	AO LTIP Units Expected life (in years) 5.5 - 6.0 Risk-free interest rate 2.6 % Volatility 29.0 % Dividend yield 3.5 %
2013 Incentive Stock Plan [Member]
Stockholders Equity [Line Items]
Schedule Of Weighted Average Assumptions	Stock Options Expected life (in years) 5.3 Risk-free interest rate 0.41 % Volatility 31.0 % Dividend yield 2.7 %
2013 Incentive Stock Plan [Member] | Mack-Cali Realty LP [Member]
Stockholders Equity [Line Items]
Schedule Of Weighted Average Assumptions	Stock Options Expected life (in years) 5.3 Risk-free interest rate 0.41 % Volatility 31.0 % Dividend yield 2.7 %

Noncontrolling Interests In S_2

Noncontrolling Interests In Subsidiaries (Tables)	12 Months Ended
	Dec. 31, 2020
Mack-Cali Realty LP [Member]
Noncontrolling Interest [Line Items]
Changes In Noncontrolling Interests Of Subsidiaries	Common Units/ Unvested LTIP Vested LTIP Units Units Balance at January 1, 2018 10,438,855 1,230,877 Redemption of common units for shares of common stock ( 264,570 ) - Redemption of common units - - Conversion of vested LTIP units to common units - - Vested LTIP units 55,064 ( 55,064 ) Issuance of units - 864,024 Cancellation of units - ( 332,731 ) Balance at December 31, 2018 10,229,349 1,707,106 Redemption of common units for shares of common stock ( 38,011 ) - Redemption of common units ( 665,918 ) - Conversion of vested LTIP units to common units 18,438 Vested LTIP units 68,206 ( 86,644 ) Issuance of units - 565,623 Cancellation of units - ( 359,754 ) Balance at December 31, 2019 9,612,064 1,826,331 Redemption of common units for shares of common stock - - Redemption of common units ( 138,615 ) - Conversion of vested LTIP units to common units 38,626 - Vested LTIP units 136,957 ( 175,583 ) Issuance of units - 1,287,568 Cancellation of units ( 1 ) ( 1,215,387 ) Balance at December 31, 2020 9,649,031 1,722,929

Segment Reporting (Tables)

Segment Reporting (Tables)	12 Months Ended
	Dec. 31, 2020
Segment Reporting Information [Line Items]
Schedule Of Selected Results Of Operations And Asset Information	Commercial Multi-family Corporate Total & Other Real Estate Real Estate & Services (d) & Other (e) Company Total revenues: 2020 $ 155,045 $ 156,841 $ 1,676 $ 313,562 2019 184,966 170,833 1,403 357,202 2018 257,487 113,805 432 371,724 Total operating and interest expenses (a): 2020 $ 73,184 $ 95,631 $ 127,184 $ 295,999 2019 80,050 89,512 127,425 296,987 2018 116,912 70,279 98,797 285,988 Equity in earnings (loss) of unconsolidated joint ventures: Three months ended: 2020 $ ( 2,254 ) $ ( 1,578 ) $ - $ ( 3,832 ) 2019 ( 1,194 ) ( 125 ) - ( 1,319 ) 2018 2,319 ( 2,446 ) - ( 127 ) Net operating income (loss) (b): Three months ended: 2020 $ 79,607 $ 59,632 $ ( 125,508 ) $ 13,731 2019 103,722 81,196 ( 126,022 ) 58,896 2018 142,894 41,080 ( 98,365 ) 85,609 Total assets: 2020 $ 1,881,161 $ 3,249,516 $ 17,109 $ 5,147,786 2019 2,178,321 3,079,409 35,068 5,292,798 Total long-lived assets (c): 2020 $ 1,693,054 $ 3,035,485 $ ( 1,411 ) $ 4,727,128 2019 1,947,053 2,812,306 3,834 4,763,193 Total investments in unconsolidated joint ventures: 2020 $ 5,555 $ 156,827 $ - $ 162,382 2019 7,367 201,724 - 209,091 (a) Total operating and interest expenses represent the sum of: real estate taxes; utilities; operating services; real estate services expenses; general and administrative, acquisition-related costs and interest expense (net of interest income). All interest expense, net of interest and other investment income, (including for property-level mortgages) is excluded from segment amounts and classified in Corporate & Other for all periods. (b) Net operating income represents total revenues less total operating and interest expenses (as defined and classified in Note “a”), plus equity in earnings (loss) of unconsolidated joint ventures, for the period. (c) Long-lived assets are comprised of net investment in rental property, unbilled rents receivable and goodwill. (d) Segment assets and operations were owned through a consolidated variable interest entity commencing in February 2018, and which also include the Company’s consolidated hotel operations. (e) Corporate & Other represents all corporate-level items (including interest and other investment income, interest expense, non-property general and administrative expense), as well as intercompany eliminations necessary to reconcile to consolidated Company totals.
Schedule Of Reconciliation Of Net Operating Income To Net Income Available To Common Shareholders	Year Ended December 31, 2020 2019 2018 Net operating income $ 13,731 $ 58,896 $ 85,609 Add (deduct): Depreciation and amortization ( 122,035 ) ( 133,597 ) ( 113,817 ) Land and other impairments ( 16,817 ) ( 32,444 ) ( 24,566 ) Property impairments ( 36,582 ) - - Gain on change of control of interests - 13,790 14,217 Realized gains (losses) and unrealized losses on disposition of rental property, net 5,481 343,102 99,436 Gain on disposition of developable land 5,787 522 30,939 Gain on sale from unconsolidated joint ventures 35,184 903 - Gain (loss) from extinguishment of debt, net ( 272 ) 1,648 ( 8,994 ) Income (loss) from continuing operations ( 115,523 ) 252,820 82,824 Discontinued operations Income from discontinued operations 70,724 24,366 23,577 Realized gains (losses) and unrealized losses on disposition of rental property and impairments, net 11,201 ( 133,350 ) - Total discontinued operations, net 81,925 ( 108,984 ) 23,577 Net income (loss) ( 33,598 ) 143,836 106,401 Noncontrolling interests in consolidated joint ventures 2,695 3,904 1,216 Noncontrolling interests in Operating Partnership 13,279 ( 23,720 ) ( 7,127 ) Noncontrolling interest in discontinued operations ( 7,880 ) 10,456 ( 2,400 ) Redeemable noncontrolling interests ( 25,883 ) ( 22,615 ) ( 13,979 ) Net income (loss) available to common shareholders $ ( 51,387 ) $ 111,861 $ 84,111
Mack-Cali Realty LP [Member]
Segment Reporting Information [Line Items]
Schedule Of Selected Results Of Operations And Asset Information	Commercial Multi-family Corporate Total & Other Real Estate Real Estate & Services (d) & Other (e) Company Total revenues: 2020 $ 155,045 $ 156,841 $ 1,676 $ 313,562 2019 184,966 170,833 1,403 357,202 2018 257,487 113,805 432 371,724 Total operating and interest expenses (a): 2020 $ 73,184 $ 95,631 $ 127,184 $ 295,999 2019 80,050 89,512 127,425 296,987 2018 116,912 70,279 98,797 285,988 Equity in earnings (loss) of unconsolidated joint ventures: Three months ended: 2020 $ ( 2,254 ) $ ( 1,578 ) $ - $ ( 3,832 ) 2019 ( 1,194 ) ( 125 ) - ( 1,319 ) 2018 2,319 ( 2,446 ) - ( 127 ) Net operating income (loss) (b): Three months ended: 2020 $ 79,607 $ 59,632 $ ( 125,508 ) $ 13,731 2019 103,722 81,196 ( 126,022 ) 58,896 2018 142,894 41,080 ( 98,365 ) 85,609 Total assets: 2020 $ 1,881,161 $ 3,249,516 $ 17,109 $ 5,147,786 2019 2,178,321 3,079,409 35,068 5,292,798 Total long-lived assets (c): 2020 $ 1,693,054 $ 3,035,485 $ ( 1,411 ) $ 4,727,128 2019 1,947,053 2,812,306 3,834 4,763,193 Total investments in unconsolidated joint ventures: 2020 $ 5,555 $ 156,827 $ - $ 162,382 2019 7,367 201,724 - 209,091 (a) Total operating and interest expenses represent the sum of: real estate taxes; utilities; operating services; real estate services expenses; general and administrative, acquisition-related costs and interest expense (net of interest income). All interest expense, net of interest and other investment income, (including for property-level mortgages) is excluded from segment amounts and classified in Corporate & Other for all periods. (b) Net operating income represents total revenues less total operating and interest expenses (as defined and classified in Note “a”), plus equity in earnings (loss) of unconsolidated joint ventures, for the period. (c) Long-lived assets are comprised of net investment in rental property, unbilled rents receivable and goodwill. (d) Segment assets and operations were owned through a consolidated variable interest entity commencing in February 2018, and which also include the Company’s consolidated hotel operations. (e) Corporate & Other represents all corporate-level items (including interest and other investment income, interest expense, non-property general and administrative expense), as well as intercompany eliminations necessary to reconcile to consolidated Company totals.
Schedule Of Reconciliation Of Net Operating Income To Net Income Available To Common Shareholders	Year Ended December 31, 2020 2019 2018 Net operating income $ 13,731 $ 58,896 $ 85,609 Add (deduct): Depreciation and amortization ( 122,035 ) ( 133,597 ) ( 113,817 ) Land and other impairments ( 16,817 ) ( 32,444 ) ( 24,566 ) Property impairments ( 36,582 ) - - Gain on change of control of interests - 13,790 14,217 Realized gains (losses) and unrealized losses on disposition of rental property, net 5,481 343,102 99,436 Gain on disposition of developable land 5,787 522 30,939 Gain on sale from unconsolidated joint ventures 35,184 903 - Gain (loss) from extinguishment of debt, net ( 272 ) 1,648 ( 8,994 ) Income (loss) from continuing operations ( 115,523 ) 252,820 82,824 Discontinued operations Income from discontinued operations 70,724 24,366 23,577 Realized gains (losses) and unrealized losses on disposition of rental property and impairments, net 11,201 ( 133,350 ) - Total discontinued operations, net 81,925 ( 108,984 ) 23,577 Net income (loss) ( 33,598 ) 143,836 106,401 Noncontrolling interests in consolidated joint ventures 2,695 3,904 1,216 Redeemable noncontrolling interests ( 25,883 ) ( 22,615 ) ( 13,979 ) Net income (loss) available to common unitholders $ ( 56,786 ) $ 125,125 $ 93,638

Condensed Quarterly Financial_2

Condensed Quarterly Financial Information (Tables)	12 Months Ended
	Dec. 31, 2020
Summary Of Condensed Quarterly Financial Information	Quarter Ended 2020 December 31 September 30 June 30 March 31 Total revenues $ 76,564 $ 79,197 $ 74,197 $ 83,604 Net income (loss) $ 78,298 $ ( 41,118 ) $ ( 32,934 ) $ ( 37,844 ) Net income (loss) available to common shareholders $ 65,632 $ ( 42,208 ) $ ( 34,887 ) $ ( 39,924 ) ` Basic earnings per common share: Income from continuing operations $ 0.22 $ ( 0.83 ) $ ( 0.50 ) $ ( 0.40 ) Discontinued operations 0.45 0.34 0.09 ( 0.07 ) Net income (loss) available to common shareholders $ 0.67 $ ( 0.49 ) $ ( 0.41 ) $ ( 0.47 ) Diluted earnings per common share: Income from continuing operations $ 0.22 $ ( 0.83 ) $ ( 0.50 ) $ ( 0.40 ) Discontinued operations 0.45 0.34 0.09 ( 0.07 ) Net income (loss) available to common shareholders $ 0.67 $ ( 0.49 ) $ ( 0.41 ) $ ( 0.47 ) Quarter Ended 2019 December 31 September 30 June 30 March 31 Total revenues $ 88,227 $ 89,038 $ 88,138 $ 91,799 Net income (loss) $ ( 55,408 ) $ ( 56,021 ) $ ( 20,329 ) $ 275,594 Net income (loss) available to common shareholders $ ( 54,652 ) $ ( 55,928 ) $ ( 22,054 ) $ 244,495 ` Basic earnings per common share: Income from continuing operations $ 0.51 $ ( 0.63 ) $ ( 0.44 ) $ 2.59 Discontinued operations ( 1.15 ) ( 0.02 ) 0.01 0.08 Net income (loss) available to common shareholders $ ( 0.64 ) $ ( 0.65 ) $ ( 0.43 ) $ 2.67 Diluted earnings per common share: Income from continuing operations $ 0.51 $ ( 0.63 ) $ ( 0.44 ) $ 2.58 Discontinued operations ( 1.15 ) ( 0.02 ) 0.01 0.08 Net income (loss) available to common shareholders $ ( 0.64 ) $ ( 0.65 ) $ ( 0.43 ) $ 2.66
Mack-Cali Realty LP [Member]
Summary Of Condensed Quarterly Financial Information	Quarter Ended 2020 December 31 September 30 June 30 March 31 Total revenues $ 76,564 $ 79,197 $ 74,197 $ 83,604 Net income (loss) $ 78,298 $ ( 41,118 ) $ ( 32,934 ) $ ( 37,844 ) Net income (loss) available to common unitholders $ 72,623 $ ( 46,694 ) $ ( 38,576 ) $ ( 44,139 ) Basic earnings per common unit: Income from continuing operations $ 0.22 $ ( 0.83 ) $ ( 0.50 ) $ ( 0.40 ) Discontinued operations 0.45 0.34 0.09 ( 0.07 ) Net income (loss) available to common unitholders $ 0.67 $ ( 0.49 ) $ ( 0.41 ) $ ( 0.47 ) Diluted earnings per common units: Income from continuing operations $ 0.22 $ ( 0.83 ) $ ( 0.50 ) $ ( 0.40 ) Discontinued operations 0.45 0.34 0.09 ( 0.07 ) Net income (loss) available to common unitholders $ 0.67 $ ( 0.49 ) $ ( 0.41 ) $ ( 0.47 ) Quarter Ended 2019 December 31 September 30 June 30 March 31 Total revenues $ 88,227 $ 89,038 $ 88,138 $ 91,799 Net income (loss) $ ( 55,408 ) $ ( 56,021 ) $ ( 20,329 ) $ 275,594 Net income (loss) available to common unitholders $ ( 60,475 ) $ ( 62,087 ) $ ( 24,488 ) $ 272,175 Basic earnings per common unit: Income from continuing operations $ 0.51 $ ( 0.63 ) $ ( 0.44 ) $ 2.59 Discontinued operations ( 1.15 ) ( 0.02 ) 0.01 0.08 Net income (loss) available to common unitholders $ ( 0.64 ) $ ( 0.65 ) $ ( 0.43 ) $ 2.67 Diluted earnings per common unit: Income from continuing operations $ 0.51 $ ( 0.63 ) $ ( 0.44 ) $ 2.58 Discontinued operations ( 1.15 ) ( 0.02 ) 0.01 0.08 Net income (loss) available to common unitholders $ ( 0.64 ) $ ( 0.65 ) $ ( 0.43 ) $ 2.66

Organization And Basis Of Pre_2

Organization And Basis Of Presentation (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)ft²propertyitemstate	Dec. 31, 2019USD ($)item	Dec. 19, 2019ft²
Real Estate Properties [Line Items]
Percentage of ownership interest	90.40%	90.40%
Number of properties owned or investment interests	52
Number of units | item	326	208
Number of states where properties are located | state	3
Consolidated joint ventures, total real estate assets | $	$ 486.1	$ 497.6
Consolidated joint ventures, other assets | $	4.5	5.5
Consolidated joint ventures, mortgages | $	284.8	283.7
Consolidated joint ventures, other liabilities | $	21	$ 18.9
Increase in land and other impairments | $	$ 2.5
Commercial Properties [Member]
Real Estate Properties [Line Items]
Number of tenants | item	225
Multi-Family Properties [Member]
Real Estate Properties [Line Items]
Number of properties owned or investment interests	19
Number of units | item	5,825
Office [Member]
Real Estate Properties [Line Items]
Number of properties owned or investment interests	25
Aggregate square feet of the property owned or investment interest | ft²	8,100,000
Unconsolidated Joint Venture Office Buildings [Member]
Real Estate Properties [Line Items]
Number of properties owned or investment interests	2
Aggregate square feet of the property owned or investment interest | ft²	200,000
Area of property (in square feet) | ft²	200,000
Unconsolidated Joint Venture Multi-Family Properties [Member]
Real Estate Properties [Line Items]
Number of properties owned or investment interests	6
Number of units | item	1,786
Unconsolidated Joint Venture Office/Flex Buildings And Hotel [Member]
Real Estate Properties [Line Items]
Number of properties owned or investment interests	3
Number of units | item	723
Parking/Retail [Member]
Real Estate Properties [Line Items]
Number of properties owned or investment interests	4
Aggregate square feet of the property owned or investment interest | ft²	108,000
Unconsolidated Joint Venture Parking/Retail Buildings [Member]
Real Estate Properties [Line Items]
Number of properties owned or investment interests	1
Aggregate square feet of the property owned or investment interest | ft²	51,000
Land [Member]
Real Estate Properties [Line Items]
Number of properties owned or investment interests	1
Suburban Office Portfolio [Member]
Real Estate Properties [Line Items]
Area of property (in square feet) | ft²			6,600,000

Significant Accounting Polici_4

Significant Accounting Policies (Narrative) (Details) - USD ($)	Jan. 01, 2019	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 03, 2020
Significant Accounting Policies [Line Items]
Capitalized development and construction salaries and other related costs										$ 2,000,000	$ 2,100,000	$ 2,300,000
Maximum period after cessation of major construction activity that projects are considered complete										1 year
Threshold of investment value for discontinuation of equity method accounting		$ 0								$ 0
Amortization of deferred financing costs										4,625,000	4,625,000	5,028,000
Losses on extinguishment of debt, including discontinued operations										1,800,000	1,800,000	1,800,000
Gain (Loss) from extinguishment of debt, net										(272,000)	1,648,000	(10,750,000)
Deferred leasing costs												$ 3,463,000
Leasing personnel costs										1,483,000	$ 2,261,000
Goodwill impairment										0
Difference between the estimated net basis and net assets of the rental property for federal income tax purposes		669,239,000								669,239,000
Deferred tax asset		$ 16,200,000								16,200,000			$ 5,300,000
Income taxes, material adjustment amount										$ 0
Common stock, shares outstanding		90,712,417				90,595,176				90,712,417	90,595,176			90,595,197
Common units outstanding														9,488,794
LTIP units outstanding														1,949,601
Distributions payable, record date						Jan. 3, 2020
Distributions payable, approved date						Dec. 17, 2019
Common stock dividends and common unit distributions per share						$ 0.20
Dividends paid per common share										$ 0.60	$ 0.80	$ 0.80
Dividends paid, percent representing ordinary income										19.00%
Dividends paid, percent representing return of capital to shareholders												47.00%
Dividends paid, percent representing capital gain										81.00%	100.00%	53.00%
Stock compensation expense										$ 7,635,000	$ 8,161,000	$ 6,894,000
Distributions payable, pay date						Jan. 10, 2020
Increase (decrease) to valuation allowance													$ (5,300,000)
Federal income tax rate										21.00%
Write off of unamortized deferred financing costs										$ 0	400,000	600,000
Net income (loss)		$ 78,298,000	$ (41,118,000)	$ (32,934,000)	$ (37,844,000)	$ (55,408,000)	$ (56,021,000)	$ (20,329,000)	$ 275,594,000	(33,598,000)	143,836,000	106,401,000
Accounting Standards Update 2017-12 [Member]
Significant Accounting Policies [Line Items]
Net income (loss)	$ 400,000
Mack-Cali Realty LP [Member]
Significant Accounting Policies [Line Items]
Gain (Loss) from extinguishment of debt, net										(272,000)	1,648,000	(10,750,000)
Taxable income										$ 79,293,000	$ 71,151,000	$ 82,106,000
Common units outstanding		9,649,031				9,612,064				9,649,031	9,612,064	10,229,349	10,438,855
LTIP units outstanding		1,722,929				1,826,331				1,722,929	1,826,331	1,707,106	1,230,877
Net income (loss)		$ 78,298,000	$ (41,118,000)	$ (32,934,000)	$ (37,844,000)	$ (55,408,000)	$ (56,021,000)	$ (20,329,000)	$ 275,594,000	$ (33,598,000)	$ 143,836,000	$ 106,401,000
Dividends paid						400,000
Mack-Cali Realty LP [Member] | General Partner Common Unitholders [Member]
Significant Accounting Policies [Line Items]
Dividends paid						18,100,000
Mack-Cali Realty LP [Member] | Limited Partner Common Unitholders [Member]
Significant Accounting Policies [Line Items]
Dividends paid						$ 1,900,000

Significant Accounting Polici_5

Significant Accounting Policies (Schedule Of Rental Property Improvements) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Land held for development (including pre-development costs, if any)	$ 364,946,000	$ 388,702,000
Development and construction in progress, including land	733,560,000	464,110,000
Total	1,098,506,000	852,812,000
Buildings and improvement	160,300,000	156,500,000
Development [Member]
Property, Plant and Equipment [Line Items]
Land	74,900,000	$ 96,600,000
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Development [Member]
Property, Plant and Equipment [Line Items]
Buildings and improvement	8,900,000
Land	$ 31,900,000

Significant Accounting Polici_6

Significant Accounting Policies (Estimated Useful Lives Of Assets) (Details)	12 Months Ended
	Dec. 31, 2020
Minimum [Member] | Buildings And Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	5 years
Minimum [Member] | Furniture, Fixtures And Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	5 years
Maximum [Member] | Buildings And Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	40 years
Maximum [Member] | Furniture, Fixtures And Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	10 years

Recent Transactions (Acquisitio

Recent Transactions (Acquisitions) (Narrative) (Details) $ in Thousands	May 10, 2019USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)item	Dec. 31, 2018USD ($)
Real Estate Properties [Line Items]
Purchase price of property		$ 138,688	$ 88,240	$ 113,523
Number of properties acquired | item			3
107 Morgan [Member]
Real Estate Properties [Line Items]
Purchase price of property	$ 67,200
Acquisition and other investment funding handled by intermediary	$ 46,100
Liberty Towers [Member]
Real Estate Properties [Line Items]
Number of properties acquired | item			1

Recent Transactions (Consolidat

Recent Transactions (Consolidation) (Narrative) (Details)	Mar. 12, 2020USD ($)ft²	Jan. 31, 2019USD ($)item	Jan. 30, 2019USD ($)	Dec. 31, 2020USD ($)item	Dec. 31, 2019USD ($)item	Dec. 31, 2018USD ($)
Real Estate Properties [Line Items]
Purchase price of property				$ 138,688,000	$ 88,240,000	$ 113,523,000
Gain on change of control of interests					13,790,000	$ 14,217,000
Issuance of loan					43,300,000
Loan balance				2,801,797,000	2,808,518,000
Total noncontrolling interests in subsidiaries				$ 193,563,000	$ 205,776,000
Number of units | item				326	208
Unconsolidated Joint Venture Multi-Family Properties [Member]
Real Estate Properties [Line Items]
Number of units | item				1,786
Unconsolidated Joint Venture Multi-Family Properties [Member] | Marbella Tower Urban Renewal Associates South LLC [Member]
Real Estate Properties [Line Items]
Percentage of interest in venture		74.27%	24.27%
Percentage of additional interest acquired		50.00%	50.00%
Purchase price of property		$ 77,500,000
Gain on change of control of interests					$ 13,800,000
Mortgage loan, maturity month and year				August 2026
Spread over LIBOR		4.20%
Mortgage loan		$ 117,000,000	$ 74,700,000
Repayment of mortgage loans		$ 74,700,000
Loan balance					15,300,000
Total noncontrolling interests in subsidiaries					$ 13,700,000
Number of units | item		311
Port Imperial North Retail, L.L.C. [Member]
Real Estate Properties [Line Items]
Total consolidated net assets				$ 15,033,000
Port Imperial North Retail, L.L.C. [Member] | Unconsolidated Joint Venture Multi-Family Properties [Member]
Real Estate Properties [Line Items]
Percentage of additional interest acquired	80.00%
Area of property (in square feet) | ft²	30,745
Purchase price of property	$ 13,300,000
Gain on change of control of interests				0
Total consolidated net assets				$ 15,000,000

Recent Transactions (Real Estat

Recent Transactions (Real Estate Held For Sale/Discontinued Operations/Dispositions) (Narrative) (Details) $ in Thousands	1 Months Ended	12 Months Ended			14 Months Ended
	Jan. 31, 2021USD ($)ft²property	Dec. 31, 2020USD ($)ft²itemproperty	Dec. 31, 2019USD ($)ft²propertyitem	Dec. 31, 2018USD ($)	Dec. 31, 2020USD ($)ft²propertyitem	Dec. 19, 2019ft²
Real Estate Properties [Line Items]
Area Of Real Estate Property Sold | ft²			4,490,578
Land and other impairments		$ 16,817	$ 32,444	$ 24,566
Proceeds from the sale of property		64,947	825,613	$ 338,015
Accumulated depreciation		656,331	558,617		$ 656,331
Book value		$ 4,638,643	$ 4,256,681		$ 4,638,643
Suburban Office Portfolio [Member]
Real Estate Properties [Line Items]
Area of property (in square feet) | ft²						6,600,000
Number of properties sold | property			2
Area Of Real Estate Property Sold | ft²			497,000
Gain (loss) on sale of property			$ 52,200
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Suburban Office Portfolio [Member]
Real Estate Properties [Line Items]
Area of property (in square feet) | ft²		3,200,000			3,200,000
Number of properties sold | property					20
Gain (loss) on sale of property					$ 377,400
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Properties Disposed Three [Member] | Subsequent Event [Member] | Suburban Office Portfolio [Member]
Real Estate Properties [Line Items]
Number of real estate properties | property	1
Area of property (in square feet) | ft²	149,600
Gain (loss) on sale of property	$ 38,000
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Suburban Office Portfolio [Member]
Real Estate Properties [Line Items]
Area of property (in square feet) | ft²			6,100,000
Number of properties held for sale | property			35
Number of disposal groups | item			12
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Properties Disposed One [Member] | Suburban Office Portfolio [Member]
Real Estate Properties [Line Items]
Number of real estate properties | property		16			16
Area of property (in square feet) | ft²		3,000,000			3,000,000
Number of disposal groups | property		6
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Properties Disposed Two [Member] | Suburban Office Portfolio [Member]
Real Estate Properties [Line Items]
Gain (loss) on sale of property		$ 652,400
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Properties Disposed Four [Member] | Suburban Office Portfolio [Member]
Real Estate Properties [Line Items]
Number of properties held for sale | property		4			4
Disposal Group, Not Discontinued Operations [Member]
Real Estate Properties [Line Items]
Unrealized losses on rental properties held for sale		$ (1,682)	$ (39,049)
Gain (loss) on sale of property		$ 7,163	382,151
Disposal Group, Not Discontinued Operations [Member] | Properties Disposed Two [Member] | Suburban Office Portfolio [Member]
Real Estate Properties [Line Items]
Number of real estate properties | property		15			15
Area of property (in square feet) | ft²		2,800,000			2,800,000
Discontinued Operations [Member]
Real Estate Properties [Line Items]
Unrealized losses on rental properties held for sale		$ (14,040)	(135,052)
Gain (loss) on sale of property		25,241	$ 1,702
Parsippany, Madison, Short Hills, Edison, And Red Bank, New Jersey [Member]
Real Estate Properties [Line Items]
Unrealized losses on rental properties held for sale		(15,700)
Book value		$ 11,300			$ 11,300
Parsippany, Madison, Short Hills, Edison, And Red Bank, New Jersey [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Real Estate Properties [Line Items]
Number of properties held for sale | property		6			6
Number of disposal groups | item		3	6
Accumulated depreciation		$ 169,031			$ 169,031
Parsippany, Madison, Short Hills, Edison, And Red Bank, New Jersey [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Suburban Office Portfolio [Member]
Real Estate Properties [Line Items]
Accumulated depreciation		$ 161,040			$ 161,040
Parsippany, Madison, Short Hills, Edison, And Red Bank, New Jersey [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Office [Member]
Real Estate Properties [Line Items]
Number of properties held for sale | property		16			16
Unrealized losses on rental properties held for sale		$ (15,700)
Number of properties not expected to recover from estimated net sales proceeds | property		6
Land and other impairments		$ 9,500
Parsippany, Madison, Short Hills, Edison, And Red Bank, New Jersey [Member] | Discontinued Operations [Member]
Real Estate Properties [Line Items]
Unrealized losses on rental properties held for sale		(14,000)
Land and other impairments		$ 9,500
Parsippany, New Jersey [Member]
Real Estate Properties [Line Items]
Number of properties held for sale | item		2			2
Holmdel, New Jersey [Member] | Disposal Group, Not Discontinued Operations [Member] | Suburban Office Portfolio [Member]
Real Estate Properties [Line Items]
Area of property (in square feet) | ft²		350,000			350,000
Accumulated depreciation		$ 10,500			$ 10,500
Book value		19,800			19,800
Reversal of valuation allowance		$ 2,800			$ 2,800
Fort Lee, Parsippany, Madison, Short Hills, Edison, Red Bank, Florham Park [Member]
Real Estate Properties [Line Items]
Unrealized losses on rental properties held for sale			$ (174,100)
Fort Lee, Parsippany, Madison, Short Hills, Edison, Red Bank, Florham Park [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Real Estate Properties [Line Items]
Number of properties held for sale | property			21
Accumulated depreciation			$ 412,785
Fort Lee, Parsippany, Madison, Short Hills, Edison, Red Bank, Florham Park [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Suburban Office Portfolio [Member]
Real Estate Properties [Line Items]
Accumulated depreciation			401,212
Fort Lee, Parsippany, Madison, Short Hills, Edison, Red Bank, Florham Park [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Office [Member]
Real Estate Properties [Line Items]
Number of disposal groups | item		6
Fort Lee, Parsippany, Madison, Short Hills, Edison, Red Bank, Florham Park [Member] | Discontinued Operations [Member]
Real Estate Properties [Line Items]
Unrealized losses on rental properties held for sale			(137,900)
Land and other impairments			$ 32,400

Recent Transactions (Impairment

Recent Transactions (Impairments On Properties Held And Used) (Narrative) (Details) $ in Thousands	1 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2020property	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)property	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Real Estate Properties [Line Items]
Property impairments | $		$ 36,600	$ 36,582
Land and other impairments | $			$ 16,817	$ 32,444	$ 24,566
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Real Estate Properties [Line Items]
Properties			6
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Land Parcels [Member]
Real Estate Properties [Line Items]
Properties			3
Land and other impairments | $			$ 7,300
Disposal Group, Not Discontinued Operations [Member] | Hotel [Member]
Real Estate Properties [Line Items]
Number of properties closed	1
Weehawken, New Jersey [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Hotel [Member]
Real Estate Properties [Line Items]
Property impairments | $		$ 36,600
Properties			2
Weehawken, New Jersey [Member] | Disposal Group, Not Discontinued Operations [Member] | Hotel [Member]
Real Estate Properties [Line Items]
Properties			2
Number of properties closed	1

Recent Transactions (Unconsolid

Recent Transactions (Unconsolidated Joint Venture Activity) (Narrative) (Details) - USD ($) $ in Thousands	Dec. 17, 2020	Feb. 28, 2019	Dec. 31, 2020	Dec. 31, 2019
Real Estate Properties [Line Items]
Gain on sale from unconsolidated joint ventures			$ 35,184	$ 903
Red Bank [Member] | Unconsolidated Joint Venture Office Buildings [Member]
Real Estate Properties [Line Items]
Gain on sale		$ 900
Sale price		$ 4,200
Crystal House [Member]
Real Estate Properties [Line Items]
Gain on sale			35,100
Crystal House [Member] | Unconsolidated Joint Venture Office Buildings [Member]
Real Estate Properties [Line Items]
Gain on sale from unconsolidated joint ventures			376,600
Gain on sale			35,100
Gain (loss) on sale of property			$ 62,700
Hillsborough 206 [Member]
Real Estate Properties [Line Items]
Gain on sale	$ 100
Sale price	2,100
Hillsborough 206 [Member] | Unconsolidated Joint Venture Developable Land [Member]
Real Estate Properties [Line Items]
Gain on sale	100
Sale price	$ 2,100

Recent Transactions (Rockpoint

Recent Transactions (Rockpoint Transaction) (Narrative) (Details) $ in Thousands	Jun. 30, 2019USD ($)	Jun. 26, 2019USD ($)property	Mar. 10, 2017USD ($)	Feb. 27, 2017USD ($)	Jun. 26, 2016USD ($)	Mar. 31, 2019USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Preferred Units [Line Items]
Payment for borrowings							$ 516,000	$ 617,000	$ 494,000
Assets							5,147,786	5,292,798
RRLP [Member]
Preferred Units [Line Items]
Mortgages and loans payable							1,700,000	1,400
Other assets							221,100	273,300
Other liabilities							90,400	115,200
Assets							$ 3,000,000	$ 2,800,000
Investment Agreement [Member] | Rockpoint [Member]
Preferred Units [Line Items]
Contributed amount to obtain equity units						$ 300,000
Incremental closing payments, Limited Partnership interest		$ 46,000	$ 150,000		$ 46,000	45,000			$ 105,000
Contributed equity value			$ 1,230,000
Investment Agreement [Member] | Rockpoint [Member] | Maximum [Member]
Preferred Units [Line Items]
Contributed amount to obtain equity units				$ 300,000		$ 300,000
Preferred Units, Contribution To Obtain Equity Units				$ 300,000
Add On Investment Agreement [Member] | Rockpoint [Member]
Preferred Units [Line Items]
Contributed amount to obtain equity units		$ 100,000
Number of properties in which additional interest was acquired during period | property		2
Payment for borrowings	$ 100,000
Right of first refusal to invest	100,000
Add On Investment Agreement [Member] | Rockpoint [Member] | Maximum [Member]
Preferred Units [Line Items]
Preferred Units, Contribution To Obtain Equity Units	$ 154,000

Recent Transactions (Schedule O

Recent Transactions (Schedule Of Properties Acquired) (Details)	12 Months Ended
	Dec. 31, 2019USD ($)ft²item	Dec. 31, 2020USD ($)
Business Acquisition [Line Items]
Number of Buildings, Acquired | item	3
Acquisition cost	$ 736,919,000
99 Wood Avenue [Member]
Business Acquisition [Line Items]
Number of Buildings, Acquired | item	1
Rentable Square Feet, Acquired | ft²	271,988
Acquisition cost	$ 61,858,000
Soho Lofts [Member]
Business Acquisition [Line Items]
Number of Buildings, Acquired | item	1
Rentable Square Feet, Acquired | ft²	377
Acquisition cost	$ 264,578,000
Liberty Towers [Member]
Business Acquisition [Line Items]
Number of Buildings, Acquired | item	1
Rentable Square Feet, Acquired | ft²	648
Acquisition cost	$ 410,483,000
Unsecured Revolving Credit Facility [Member] | Liberty Towers [Member]
Business Acquisition [Line Items]
Mortgage loan		$ 232,000,000

Recent Transactions (Schedule_2

Recent Transactions (Schedule Of Acquisition Cost Allocated To Net Assets Acquired) (Details)	12 Months Ended
	Dec. 31, 2020USD ($)
Business Acquisition [Line Items]
Land and leasehold interests	$ 103,532,000
Buildings and improvements and other assets	608,174,000
Above market lease values	487,000
In-place lease values	27,206,000
Sub Total	739,399,000
Less: Below market lease values	(2,480,000)
Net assets recorded upon acquisition	736,919,000
99 Wood Avenue [Member]
Business Acquisition [Line Items]
Land and leasehold interests	9,261,000
Buildings and improvements and other assets	45,576,000
Above market lease values	431,000
In-place lease values	8,264,000
Sub Total	63,532,000
Less: Below market lease values	(1,674,000)
Net assets recorded upon acquisition	$ 61,858,000
99 Wood Avenue [Member] | Above Market, In-Place And Below Market Leases [Member]
Business Acquisition [Line Items]
Amortization period	4 years 3 months 18 days
Soho Lofts [Member]
Business Acquisition [Line Items]
Land and leasehold interests	$ 27,601,000
Buildings and improvements and other assets	231,663,000
In-place lease values	5,480,000
Sub Total	264,744,000
Less: Below market lease values	(166,000)
Net assets recorded upon acquisition	$ 264,578,000
Soho Lofts [Member] | In-Place And Below Market Leases [Member]
Business Acquisition [Line Items]
Amortization period	9 months 18 days
Liberty Towers [Member]
Business Acquisition [Line Items]
Land and leasehold interests	$ 66,670,000
Buildings and improvements and other assets	330,935,000
Above market lease values	56,000
In-place lease values	13,462,000
Sub Total	411,123,000
Less: Below market lease values	(640,000)
Net assets recorded upon acquisition	$ 410,483,000
Liberty Towers [Member] | Above Market, In-Place And Below Market Leases [Member]
Business Acquisition [Line Items]
Amortization period	6 months

Recent Transactions (Schedule_3

Recent Transactions (Schedule Of Properties Which Commenced Initial Operations) (Details)	12 Months Ended
	Dec. 31, 2020USD ($)item	Dec. 31, 2019USD ($)item
Real Estate Properties [Line Items]
Total number of Apartment Units | item	326	208
Total Development Costs Incurred | $	$ 103,993,000	$ 105,477,000
Emery At Overlook Ridge [Member]
Real Estate Properties [Line Items]
Total number of Apartment Units | item	326
Total Development Costs Incurred | $	$ 103,993,000
Autograph Collection By Marriott (Phase II) [Member]
Real Estate Properties [Line Items]
Total number of Apartment Units | item		208
Total Development Costs Incurred | $		$ 105,477,000

Recent Transactions (Schedule_4

Recent Transactions (Schedule Of Net Assets Recorded Upon Consolidation) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Land and leasehold interests	$ 103,532,000
Buildings and improvements and other assets, net	608,174,000
Above market lease values	487,000
In-place lease values	27,206,000
Above/Below market lease value, net	(2,480,000)
Sub Total	739,399,000
Net assets	736,919,000
Port Imperial North Retail, L.L.C. [Member]
Business Acquisition [Line Items]
Land and leasehold interests	4,305,000
Buildings and improvements and other assets, net	8,912,000
In-place lease values	1,503,000
Above/Below market lease value, net	313,000
Net assets recorded upon consolidation	$ 15,033,000
Port Imperial North Retail, L.L.C. [Member] | In-Place And Below Market Leases [Member]
Business Acquisition [Line Items]
Amortization period	7 years 6 months
Marbella Tower Urban Renewal Associates South LLC [Member]
Business Acquisition [Line Items]
Land and leasehold interests		$ 36,595,000
Buildings and improvements and other assets, net		153,974,000
In-place lease values		4,611,000
Above/Below market lease value, net		(80,000)
Sub Total		195,100,000
Less: Debt		(117,000,000)
Net assets		78,100,000
Less: Noncontrolling interests		(13,722,000)
Net assets recorded upon consolidation		$ 64,378,000
Marbella Tower Urban Renewal Associates South LLC [Member] | In-Place And Below Market Leases [Member]
Business Acquisition [Line Items]
Amortization period		6 months 6 days

Recent Transactions (Schedule_5

Recent Transactions (Schedule Of Real Estate Held For Sale/Discontinued Operations/Dispositions) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Less: Accumulated depreciation	$ (656,331)	$ (558,617)
Real estate held for sale, net	656,963	966,497
Fort Lee, Parsippany, Madison, Short Hills, Edison, Red Bank, Florham Park [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Land		235,253
Buildings & Other		1,318,130
Less: Accumulated depreciation		(412,785)
Less: Cumulative unrealized losses on property held for sale		(174,101)
Real estate held for sale, net		966,497
Unbilled rents receivable, net		32,144
Deferred charges, net		34,332
Total intangibles, net		33,095
Total deferred charges & other assets, net		70,414
Mortgages & loans payable, net		123,650
Total below market liability		8,833
Accounts payable, accrued exp & other liability		22,817
Unearned rents/deferred rental income		2,952
Fort Lee, Parsippany, Madison, Short Hills, Edison, Red Bank, Florham Park [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Other Assets Held for Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Land		87,663
Buildings & Other		54,392
Less: Accumulated depreciation		(11,573)
Less: Cumulative unrealized losses on property held for sale		(36,225)
Real estate held for sale, net		94,257
Unbilled rents receivable, net		1,956
Deferred charges, net		1,432
Total deferred charges & other assets, net		1,730
Accounts payable, accrued exp & other liability		1,792
Parsippany, Madison, Short Hills, Edison, And Red Bank, New Jersey [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Land	164,211
Buildings & Other	779,871
Less: Accumulated depreciation	(169,031)
Less: Cumulative unrealized losses on property held for sale	(118,088)
Real estate held for sale, net	656,963
Unbilled rents receivable, net	19,318
Deferred charges, net	15,981
Total intangibles, net	26,069
Total deferred charges & other assets, net	43,178
Mortgages & loans payable, net	123,768
Total below market liability	6,538
Accounts payable, accrued exp & other liability	17,052
Unearned rents/deferred rental income	8,639
Parsippany, Madison, Short Hills, Edison, And Red Bank, New Jersey [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Other Assets Held for Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Land	76,396
Buildings & Other	42,202
Less: Accumulated depreciation	(7,991)
Less: Cumulative unrealized losses on property held for sale	(40,731)
Real estate held for sale, net	69,876
Unbilled rents receivable, net	2,102
Deferred charges, net	661
Total deferred charges & other assets, net	665
Accounts payable, accrued exp & other liability	80
Unearned rents/deferred rental income	217
Suburban Office Portfolio [Member] | Fort Lee, Parsippany, Madison, Short Hills, Edison, Red Bank, Florham Park [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Land		147,590
Buildings & Other		1,263,738
Less: Accumulated depreciation		(401,212)
Less: Cumulative unrealized losses on property held for sale		(137,876)
Real estate held for sale, net		872,240
Unbilled rents receivable, net		30,188
Deferred charges, net		32,900
Total intangibles, net		33,095
Total deferred charges & other assets, net		68,684
Mortgages & loans payable, net		123,650
Total below market liability		8,833
Accounts payable, accrued exp & other liability		21,025
Unearned rents/deferred rental income		$ 2,952
Suburban Office Portfolio [Member] | Parsippany, Madison, Short Hills, Edison, And Red Bank, New Jersey [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Land	87,815
Buildings & Other	737,669
Less: Accumulated depreciation	(161,040)
Less: Cumulative unrealized losses on property held for sale	(77,357)
Real estate held for sale, net	587,087
Unbilled rents receivable, net	17,216
Deferred charges, net	15,320
Total intangibles, net	26,069
Total deferred charges & other assets, net	42,513
Mortgages & loans payable, net	123,768
Total below market liability	6,538
Accounts payable, accrued exp & other liability	16,972
Unearned rents/deferred rental income	$ 8,422

Recent Transactions (Schedule_6

Recent Transactions (Schedule Of Disposed Properties) (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019USD ($)	Dec. 31, 2020USD ($)ft²item	Dec. 31, 2019USD ($)ft²itempropertyshares	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rentable Square Feet/Units | ft²			4,490,578
Valuation allowance		$ 16,200			$ 5,300
Number of units | item		326	208
721 Route 202/206 South [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rentable Square Feet/Units | ft²			192,741
Park Square Apartments [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rentable Square Feet/Units | ft²			159
2115 Linwood Avenue [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rentable Square Feet/Units | ft²			68,000
201 Littleton Road [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rentable Square Feet/Units | ft²			88,369
320 & 321 University Avenue [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rentable Square Feet/Units | ft²			147,406
Flex Portfolio [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rentable Square Feet/Units | ft²			3,148,512
650 From Road [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rentable Square Feet/Units | ft²			348,510
3600 Route 66 [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rentable Square Feet/Units | ft²			180,000
Chase and Alterra Portfolio [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rentable Square Feet/Units | ft²			1,386
5 Wood Hollow Road [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rentable Square Feet/Units | ft²			317,040
Disposal Group, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | item		20	68
Net Sales Proceeds		$ 370,754	$ 1,052,427
Net Carrying Value		338,350	668,574
Realized Gains (losses)/Unrealized Losses, net		$ 7,163	382,151
Area of real estate property held for sale (in square feet) | ft²		2,725,639
Unrealized losses on rental properties held for sale		$ (1,682)	(39,049)
Totals		$ 5,481	$ 343,102
Disposal Group, Not Discontinued Operations [Member] | 721 Route 202/206 South [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | item			1
Net Sales Proceeds			$ 5,651
Net Carrying Value			5,410
Realized Gains (losses)/Unrealized Losses, net			$ 241
Valuation allowance				$ 9,300
Disposal Group, Not Discontinued Operations [Member] | Park Square Apartments [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | item			1
Net Sales Proceeds			$ 34,045
Net Carrying Value			34,032
Realized Gains (losses)/Unrealized Losses, net			$ 13
Valuation allowance				6,300
Disposal Group, Not Discontinued Operations [Member] | 2115 Linwood Avenue [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | item			1
Net Sales Proceeds			$ 15,197
Net Carrying Value			7,433
Realized Gains (losses)/Unrealized Losses, net			$ 7,764
Disposal Group, Not Discontinued Operations [Member] | 201 Littleton Road [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | item			1
Net Sales Proceeds			$ 4,842
Net Carrying Value			4,937
Realized Gains (losses)/Unrealized Losses, net			$ (95)
Valuation allowance				3,600
Disposal Group, Not Discontinued Operations [Member] | 320 & 321 University Avenue [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | item			2
Net Sales Proceeds			$ 25,552
Net Carrying Value			18,456
Realized Gains (losses)/Unrealized Losses, net			$ 7,096
Disposal Group, Not Discontinued Operations [Member] | Flex Portfolio [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | item			56
Net Sales Proceeds			$ 470,348
Net Carrying Value			214,758
Realized Gains (losses)/Unrealized Losses, net			$ 255,590
Number of properties disposed | property			2
Repayment of mortgage loans			$ 90,000
Funds from qualified intermediary			217,400
Mortgage loan			$ 350,000
Number of units | item			377
Redemption of common units, shares | shares			301,638
Value of units redeemed			$ 6,600
Disposal Group, Not Discontinued Operations [Member] | 650 From Road [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | item			1
Net Sales Proceeds			$ 37,801
Net Carrying Value			40,046
Realized Gains (losses)/Unrealized Losses, net			$ (2,245)
Valuation allowance				$ 900
Disposal Group, Not Discontinued Operations [Member] | 3600 Route 66 [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | item			1
Net Sales Proceeds			$ 25,237
Net Carrying Value			$ 17,246
Disposal Group, Not Discontinued Operations [Member] | Chase and Alterra Portfolio [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | item			3
Net Sales Proceeds			$ 406,817
Net Carrying Value			293,030
Realized Gains (losses)/Unrealized Losses, net			113,787
Mortgage loan			$ 235,800
Disposal Group, Not Discontinued Operations [Member] | 5 Wood Hollow Road [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | item			1
Net Sales Proceeds			$ 26,937
Net Carrying Value			33,226
Impairment charge	$ 5,800
Disposal Group, Not Discontinued Operations [Member] | One Bridge Plaza [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | item		1
Rentable Square Feet/Units | ft²		200,000
Net Sales Proceeds		$ 35,065
Net Carrying Value		$ 17,743
Disposal Group, Not Discontinued Operations [Member] | 3 Giralda Farms [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | item		1
Rentable Square Feet/Units | ft²		141,000
Net Sales Proceeds		$ 7,510
Net Carrying Value		9,534
Valuation allowance		$ 2,000	16,700
Disposal Group, Not Discontinued Operations [Member] | Morris Portfolio [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | item		10
Rentable Square Feet/Units | ft²		1,448,420
Net Sales Proceeds		$ 155,116
Net Carrying Value		175,772
Valuation allowance		$ 21,600	32,500
Disposal Group, Not Discontinued Operations [Member] | 325 Columbia Turnpike [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | item		1
Rentable Square Feet/Units | ft²		168,144
Net Sales Proceeds		$ 24,276
Net Carrying Value		$ 8,020
Disposal Group, Not Discontinued Operations [Member] | 9 Campus Drive [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | item		1
Rentable Square Feet/Units | ft²		156,945
Net Sales Proceeds		$ 20,678
Net Carrying Value		$ 22,162
Valuation allowance			3,500
Disposal Group, Not Discontinued Operations [Member] | 385 Vaughn Drive [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | item		1
Rentable Square Feet/Units | ft²		98,500
Net Sales Proceeds		$ 7,282
Net Carrying Value		$ 5,754
Disposal Group, Not Discontinued Operations [Member] | 7 Campus Drive [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | item		1
Rentable Square Feet/Units | ft²		154,395
Net Sales Proceeds		$ 12,278
Net Carrying Value		$ 11,804
Valuation allowance			6,000
Disposal Group, Not Discontinued Operations [Member] | 581 Main Street [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | item		1
Rentable Square Feet/Units | ft²		200,000
Net Sales Proceeds		$ 58,400
Net Carrying Value		$ 43,113
Disposal Group, Not Discontinued Operations [Member] | 500 College Road East [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | item		1
Rentable Square Feet/Units | ft²		158,235
Net Sales Proceeds		$ 4,582
Net Carrying Value		6,044
Valuation allowance		$ 1,900
Disposal Group, Not Discontinued Operations [Member] | 5/10 Dennis St And 100 Hiram Sq [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | item		2
Rentalable Units | item		200
Net Sales Proceeds		$ 45,567
Net Carrying Value		38,404
Realized Gains (losses)/Unrealized Losses, net		7,163
Disposal Group, Not Discontinued Operations [Member] | Unsecured Revolving Credit Facility [Member] | Flex Portfolio [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Mortgage loan			119,900
Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Realized Gains (losses)/Unrealized Losses, net		25,241	1,702
Unrealized losses on rental properties held for sale		(14,040)	(135,052)
Totals		11,201	(133,350)
Discontinued Operations [Member] | 3600 Route 66 [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Realized Gains (losses)/Unrealized Losses, net			7,991
Discontinued Operations [Member] | 5 Wood Hollow Road [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Realized Gains (losses)/Unrealized Losses, net			$ (6,289)
Discontinued Operations [Member] | One Bridge Plaza [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Realized Gains (losses)/Unrealized Losses, net		17,322
Discontinued Operations [Member] | 3 Giralda Farms [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Realized Gains (losses)/Unrealized Losses, net		(2,024)
Discontinued Operations [Member] | Morris Portfolio [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Realized Gains (losses)/Unrealized Losses, net		(20,656)
Discontinued Operations [Member] | 325 Columbia Turnpike [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Realized Gains (losses)/Unrealized Losses, net		16,256
Discontinued Operations [Member] | 9 Campus Drive [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Realized Gains (losses)/Unrealized Losses, net		(1,484)
Discontinued Operations [Member] | 385 Vaughn Drive [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Realized Gains (losses)/Unrealized Losses, net		1,528
Discontinued Operations [Member] | 7 Campus Drive [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Realized Gains (losses)/Unrealized Losses, net		474
Discontinued Operations [Member] | 581 Main Street [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Realized Gains (losses)/Unrealized Losses, net		15,287
Discontinued Operations [Member] | 500 College Road East [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Realized Gains (losses)/Unrealized Losses, net		$ (1,462)

Recent Transactions (Schedule_7

Recent Transactions (Schedule Of Disposed Developable Land) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net Sales Proceeds		$ 18,383
Net Carrying Value		17,860
Realized Gains (losses)/Unrealized Losses, net		523
Land impairments	$ 16,817	32,444	$ 24,566
Disposal Group, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net Sales Proceeds	18,917
Net Carrying Value	13,130
Realized Gains (losses)/Unrealized Losses, net	5,787
230 & 250 Half Mile Road [Member] | Disposal Group, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net Sales Proceeds	7,018
Net Carrying Value	2,969
Realized Gains (losses)/Unrealized Losses, net	4,049
Capital Office Park Land [Member] | Disposal Group, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net Sales Proceeds	8,974
Net Carrying Value	8,210
Realized Gains (losses)/Unrealized Losses, net	764
Fourteen And Sixteen Skyline Drive [Member] | Disposal Group, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net Sales Proceeds	2,925
Net Carrying Value	1,951
Realized Gains (losses)/Unrealized Losses, net	$ 974
The Chase At Overlook Ridge [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net Sales Proceeds		685
Net Carrying Value		415
Realized Gains (losses)/Unrealized Losses, net		270
The Chase At Overlook Ridge [Member] | Disposal Group, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Land impairments			10,900
Alterra At Overlook Ridge IA [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net Sales Proceeds		1,135
Net Carrying Value		839
Realized Gains (losses)/Unrealized Losses, net		296
Alterra At Overlook Ridge IA [Member] | Disposal Group, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Land impairments		2,700	$ 13,600
150 Monument Street [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net Sales Proceeds		8,374
Net Carrying Value		7,874
Realized Gains (losses)/Unrealized Losses, net		500
51 Washington Street [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net Sales Proceeds		8,189
Net Carrying Value		8,732
Realized Gains (losses)/Unrealized Losses, net		$ (543)

Investments In Unconsolidated_3

Investments In Unconsolidated Joint Ventures (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)ft²propertyitem	Dec. 31, 2019USD ($)item
Schedule of Equity Method Investments [Line Items]
Carrying Value	$ 162,382	$ 209,091
Number of units | item	326	208
Amount outstanding	$ 25,000	$ 329,000
Management, leasing, development and other services fees	2,200	2,400
Accounts receivable due from unconsolidated joint ventures	300	600
Maximum exposure to loss	142,200
Estimated future funding commitments	33,200
Variable Interest Entity, Primary Beneficiary [Member]
Schedule of Equity Method Investments [Line Items]
Carrying Value	$ 109,000
Number of VIEs | property	3
Unconsolidated Joint Venture Other Property [Member]
Schedule of Equity Method Investments [Line Items]
Carrying Value	$ 162,382	$ 209,091
Unconsolidated Joint Venture Office Buildings [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties | property	2
Area of property (in square feet) | ft²	200,000
Unconsolidated Joint Venture Retail Buildings [Member]
Schedule of Equity Method Investments [Line Items]
Area of mixed use project (in square feet) | ft²	51,000
Unconsolidated Joint Venture Multi-Family Properties [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties | property	6
Number of units | item	1,786
Unconsolidated Joint Venture Hotel [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item	351
Unconsolidated Joint Venture Development Projects [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item	360
Unconsolidated Joint Venture Development Projects [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Schedule of Equity Method Investments [Line Items]
Number of VIEs | property	1
Unconsolidated Joint Venture Land Parcels [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item	1,621
Unconsolidated Joint Ventures [Member] | Guarantee of Indebtedness of Others [Member]
Schedule of Equity Method Investments [Line Items]
Maximum borrowing capacity	$ 304,000
Amount outstanding	267,600
Unconsolidated Joint Ventures [Member] | Parent Company [Member] | Guarantee of Indebtedness of Others [Member]
Schedule of Equity Method Investments [Line Items]
Maximum borrowing capacity	33,200
Amount outstanding	$ 29,600
Unconsolidated Joint Venture Property [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Schedule of Equity Method Investments [Line Items]
Number of VIEs | property	2
Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of interest in venture	20.00%
Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of interest in venture	85.00%

Investments In Unconsolidated_4

Investments In Unconsolidated Joint Ventures (Summary Of Unconsolidated Joint Ventures) (Details)	Dec. 17, 2020USD ($)	Sep. 18, 2020USD ($)	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)ft²item	Dec. 31, 2019USD ($)item	Dec. 31, 2018USD ($)	Mar. 12, 2020	Jan. 30, 2019USD ($)
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item				326	208
Carrying Value				$ 162,382,000	$ 209,091,000
Purchase price of property				138,688,000	88,240,000	$ 113,523,000
Property impairments on continuing operations			$ 36,600,000	$ 36,582,000
Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Company's Effective Ownership %				20.00%
Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Company's Effective Ownership %				85.00%
Metropolitan And Lofts At 40 Park [Member]
Schedule of Equity Method Investments [Line Items]
Rentable Square Feet (sf) | ft²				50,973
Crystal House [Member]
Schedule of Equity Method Investments [Line Items]
Gain on sale				$ 35,100,000
PI North - Riverwalk C [Member] | Construction Loan [Member]
Schedule of Equity Method Investments [Line Items]
Maximum borrowing capacity				$ 112,000,000
Riverpark At Harrison [Member]
Schedule of Equity Method Investments [Line Items]
Maximum borrowing capacity								$ 30,192,000
PI North - Land [Member] | Construction Loan [Member]
Schedule of Equity Method Investments [Line Items]
Percent of principal loan outstanding				10.00%
Hillsborough 206 [Member]
Schedule of Equity Method Investments [Line Items]
Gain on sale	$ 100,000
Sale price	$ 2,100,000
12 Vreeland Road [Member]
Schedule of Equity Method Investments [Line Items]
Property impairments on continuing operations				$ 2,600,000	3,700,000
The Shops At 40 Park Property [Member] | Metropolitan And Lofts At 40 Park [Member]
Schedule of Equity Method Investments [Line Items]
Balance		$ 6,067,000
Property Debt, Interest Rate, Spread Over LIBOR		1.50%
Residual ownership interest				25.00%
Mortgage loan, maturity month and year				October 2021
Lofts At 40 Park Property [Member] | Metropolitan And Lofts At 40 Park [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item				59
Balance		$ 18,200,000
Property Debt, Interest Rate, Spread Over LIBOR		1.50%
Indirect ownership interest				50.00%
Number of stories | item				5
Mortgage loan, maturity month and year				January 2023
Metropolitan Property [Member] | Metropolitan And Lofts At 40 Park [Member]
Schedule of Equity Method Investments [Line Items]
Balance		$ 36,500,000
Property Debt, Interest Rate, Spread Over LIBOR		2.85%
Mortgage loan, maturity month and year				October 2023
Unconsolidated Joint Venture Multi-Family Properties [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item				1,786
Unconsolidated Joint Venture Multi-Family Properties [Member] | Metropolitan And Lofts At 40 Park [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item				189
Company's Effective Ownership %				25.00%
Carrying Value				$ 3,347,000	7,257,000
Balance				$ 60,767,000
Unconsolidated Joint Venture Multi-Family Properties [Member] | RiverTrace At Port Imperial [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item				316
Company's Effective Ownership %				22.50%
Carrying Value				$ 6,667,000	7,463,000
Balance				$ 82,000,000
Property Debt, Maturity Date				Nov. 10, 2026
Property Debt, Interest Rate				3.21%
Unconsolidated Joint Venture Multi-Family Properties [Member] | Crystal House [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item				825
Company's Effective Ownership %				25.00%
Carrying Value					28,823,000
Unconsolidated Joint Venture Multi-Family Properties [Member] | PI North - Riverwalk C [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item				360
Company's Effective Ownership %				40.00%
Carrying Value				$ 36,992,000	35,527,000
Balance				$ 75,569,000
Property Debt, Maturity Date				Dec. 6, 2021
Property Debt, Interest Rate				2.75%
Unconsolidated Joint Venture Multi-Family Properties [Member] | Riverpark At Harrison [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item				141
Company's Effective Ownership %				45.00%
Carrying Value				$ 681,000	1,015,000
Balance				$ 30,192,000
Property Debt, Maturity Date				Jul. 1, 2035
Property Debt, Interest Rate				3.19%
Unconsolidated Joint Venture Multi-Family Properties [Member] | Station House [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item				378
Company's Effective Ownership %				50.00%
Carrying Value				$ 34,026,000	35,676,000
Balance				$ 95,137,000
Property Debt, Maturity Date				Jul. 1, 2033
Property Debt, Interest Rate				4.82%
Unconsolidated Joint Venture Multi-Family Properties [Member] | Urby At Harborside [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item				762
Company's Effective Ownership %				85.00%
Carrying Value				$ 72,752,000	79,790,000
Balance				$ 192,000,000
Property Debt, Maturity Date				Aug. 1, 2029
Property Debt, Interest Rate				5.197%
Guaranteed amount				$ 22,000,000
Unconsolidated Joint Venture Multi-Family Properties [Member] | PI North - Land [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item				771
Company's Effective Ownership %				20.00%
Carrying Value				$ 1,678,000	1,678,000
Unconsolidated Joint Venture Multi-Family Properties [Member] | Liberty Landing [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item				850
Company's Effective Ownership %				50.00%
Carrying Value				$ 337,000	337,000
Unconsolidated Joint Venture Multi-Family Properties [Member] | Hillsborough 206 [Member]
Schedule of Equity Method Investments [Line Items]
Rentable Square Feet (sf) | ft²				160,000
Company's Effective Ownership %				50.00%
Carrying Value					1,962,000
Unconsolidated Joint Venture Office Buildings [Member]
Schedule of Equity Method Investments [Line Items]
Rentable Square Feet (sf) | ft²				200,000
Unconsolidated Joint Venture Office Buildings [Member] | Crystal House [Member]
Schedule of Equity Method Investments [Line Items]
Gain on sale				$ 35,100,000
Unconsolidated Joint Venture Office Buildings [Member] | 12 Vreeland Road [Member]
Schedule of Equity Method Investments [Line Items]
Rentable Square Feet (sf) | ft²				139,750
Company's Effective Ownership %				50.00%
Carrying Value				$ 1,811,000	3,846,000
Balance				$ 4,582,000
Property Debt, Maturity Date				Jul. 1, 2023
Property Debt, Interest Rate				2.87%
Unconsolidated Joint Venture Office Buildings [Member] | Offices At Crystal Lake [Member]
Schedule of Equity Method Investments [Line Items]
Rentable Square Feet (sf) | ft²				106,345
Company's Effective Ownership %				31.25%
Carrying Value				$ 3,744,000	3,521,000
Balance				$ 2,532,000
Property Debt, Maturity Date				Nov. 1, 2023
Property Debt, Interest Rate				4.76%
Unconsolidated Joint Venture Other Property [Member]
Schedule of Equity Method Investments [Line Items]
Carrying Value				$ 162,382,000	209,091,000
Balance				$ 642,779,000
Unconsolidated Joint Venture Other Property [Member] | Riverwalk Retail [Member]
Schedule of Equity Method Investments [Line Items]
Rentable Square Feet (sf) | ft²				30,745
Company's Effective Ownership %				20.00%			80.00%
Carrying Value					1,467,000
Unconsolidated Joint Venture Other Property [Member] | Hyatt Regency Hotel Jersey City [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item				351
Company's Effective Ownership %				50.00%
Balance				$ 100,000,000
Property Debt, Maturity Date				Oct. 1, 2026
Property Debt, Interest Rate				3.668%
Unconsolidated Joint Venture Other Property [Member] | Other [Member]
Schedule of Equity Method Investments [Line Items]
Carrying Value				$ 347,000	$ 729,000

Investments In Unconsolidated_5

Investments In Unconsolidated Joint Ventures (Summary Of Company's Equity In Earnings (Loss) Of Unconsolidated Joint Ventures) (Details) - USD ($)	Dec. 17, 2020	Feb. 28, 2019	Jan. 31, 2019	Jan. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Mar. 12, 2020
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures					$ (3,832,000)	$ (1,319,000)	$ (127,000)
Amortization of basis difference					581,000	638,000
Crystal House [Member]
Schedule of Equity Method Investments [Line Items]
Gain on sale					35,100,000
Hillsborough 206 [Member]
Schedule of Equity Method Investments [Line Items]
Gain on sale	$ 100,000
Unconsolidated Joint Venture Multi-Family Properties [Member] | Marbella [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures							205,000
Unconsolidated Joint Venture Multi-Family Properties [Member] | Metropolitan And Lofts At 40 Park [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures					$ (1,010,000)	(422,000)	(455,000)
Company's Effective Ownership %					25.00%
Unconsolidated Joint Venture Multi-Family Properties [Member] | RiverTrace At Port Imperial [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures					$ 111,000	317,000	154,000
Company's Effective Ownership %					22.50%
Unconsolidated Joint Venture Multi-Family Properties [Member] | Marbella Tower Urban Renewal Associates South LLC [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of additional interest acquired			50.00%	50.00%
Company's Effective Ownership %			74.27%	24.27%
Unconsolidated Joint Venture Multi-Family Properties [Member] | Crystal House [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures					$ (924,000)	(687,000)	(874,000)
Company's Effective Ownership %					25.00%
Unconsolidated Joint Venture Multi-Family Properties [Member] | PI North - Riverwalk C [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures					$ (368,000)	(279,000)	(126,000)
Company's Effective Ownership %					40.00%
Unconsolidated Joint Venture Multi-Family Properties [Member] | Marbella II [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures						(15,000)	35,000
Percentage of additional interest acquired			50.00%
Company's Effective Ownership %			74.27%	24.27%
Unconsolidated Joint Venture Multi-Family Properties [Member] | Riverpark At Harrison [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures					$ (273,000)	(172,000)	(232,000)
Company's Effective Ownership %					45.00%
Unconsolidated Joint Venture Multi-Family Properties [Member] | Station House [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures					$ (1,650,000)	(2,000,000)	(2,096,000)
Company's Effective Ownership %					50.00%
Unconsolidated Joint Venture Multi-Family Properties [Member] | Urby At Harborside [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures					$ 1,095,000	1,587,000	(975,000)
Economic tax credit certificate income					$ 2,600,000
Period of venture agreement to sell economic tax credit					7 years
Annual proceeds from economic tax credit					$ 3,000,000
Total proceeds from economic tax credit					$ 21,000,000
Company's Effective Ownership %					85.00%
Unconsolidated Joint Venture Multi-Family Properties [Member] | Liberty Landing [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures					$ (5,000)		(5,000)
Company's Effective Ownership %					50.00%
Unconsolidated Joint Venture Multi-Family Properties [Member] | Hillsborough 206 [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures							16,000
Company's Effective Ownership %					50.00%
Unconsolidated Joint Venture Office Buildings [Member] | Crystal House [Member]
Schedule of Equity Method Investments [Line Items]
Gain on sale					$ 35,100,000
Unconsolidated Joint Venture Office Buildings [Member] | Red Bank [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures						8,000	(215,000)
Percentage of interest sold		50.00%
Gain on sale		$ 900,000
Unconsolidated Joint Venture Office Buildings [Member] | 12 Vreeland Road [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures					$ (2,035,000)	(3,172,000)	285,000
Company's Effective Ownership %					50.00%
Unconsolidated Joint Venture Office Buildings [Member] | Offices At Crystal Lake [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures					$ 224,000	79,000	73,000
Company's Effective Ownership %					31.25%
Unconsolidated Joint Venture Other Property [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures					$ (3,832,000)	(1,319,000)	(127,000)
Unconsolidated Joint Venture Other Property [Member] | Riverwalk Retail [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures					$ (10,000)	(72,000)	(86,000)
Company's Effective Ownership %					20.00%			80.00%
Unconsolidated Joint Venture Other Property [Member] | Hyatt Regency Hotel Jersey City [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures					$ 625,000	3,388,000	3,672,000
Company's Effective Ownership %					50.00%
Unconsolidated Joint Venture Other Property [Member] | Other [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures					$ 388,000	$ 121,000	$ 497,000

Deferred Charges, Goodwill An_3

Deferred Charges, Goodwill And Other Assets, Net (Narrative) (Details) - USD ($)	1 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Aug. 31, 2019	Jun. 30, 2019	Mar. 31, 2019
Credit Risk Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives, Net liability position		$ 0
Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Terminated notional amount					$ 145,000,000	$ 160,000,000
Reclassification of a gain			$ 1,900,000
Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Ineffective gain (loss) in interest expense			9,000
Notional Value	$ 280,000,000		280,000,000
Terminated notional amount	36,000		36,000
Reclassification of a gain	25,000
Derivatives, Net liability position	$ 16,000		16,000
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Ineffective gain (loss) in interest expense		$ 0	0	$ 200,000
Notional Value							$ 90,000,000
Interest And Other Investment Income (Loss) [Member] | Not Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification of a gain			$ 1,926,000	$ (204,000)

Deferred Charges, Goodwill An_4

Deferred Charges, Goodwill And Other Assets, Net (Schedule Of Deferred Charges, Goodwill And Other Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2019
Deferred Charges, Goodwill And Other Assets [Line Items]
Deferred leasing costs	$ 112,421	$ 142,424
Deferred financing costs - unsecured revolving credit facility	5,559	5,559
Deferred charges, gross	117,980	147,983
Accumulated amortization	(52,428)	(59,522)
Deferred charges, net	65,552	88,461
Notes receivable	1,167	1,625
In-place lease values, related intangibles and other assets, net	71,608	86,092
Goodwill	2,945	2,945
Right of use assets	22,298	22,604
Prepaid expenses and other assets, net	35,971	73,375
Total deferred charges, goodwill and other assets, net	199,541	275,102
Liability				$ 23,600
Revenue from leases	272,970	302,409	$ 323,793
Acquired Above And Below Market Lease Intangibles [Member]
Deferred Charges, Goodwill And Other Assets [Line Items]
Revenue from leases	3,700	4,300	$ 5,300
Acquisition-related Costs [Member]
Deferred Charges, Goodwill And Other Assets [Line Items]
Net sales proceeds held by qualified intermediary	$ 0	28,100
Interest-Free Notes Receivable [Member]
Deferred Charges, Goodwill And Other Assets [Line Items]
Mortgage loan, maturity month and year	April 2023
Mortgage receivable	$ 1,200	1,600
Discontinued Operations [Member]
Deferred Charges, Goodwill And Other Assets [Line Items]
Total deferred charges, goodwill and other assets, net	$ 42,500	$ 68,600

Deferred Charges, Goodwill An_5

Deferred Charges, Goodwill And Other Assets, Net (Summary Of Scheduled Amortization) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
2021	$ 3,358
2022	3,218
2023	2,528
2024	2,214
2025	2,292
Acquired Above Market Lease [Member]
Finite-Lived Intangible Assets [Line Items]
2021	(1,262)
2022	(1,150)
2023	(1,020)
2024	(866)
2025	(391)
Acquired Below-Market Lease Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
2021	4,620
2022	4,368
2023	3,548
2024	3,080
2025	2,683
In-Place Leases [Member]
Finite-Lived Intangible Assets [Line Items]
2021	9,454
2022	8,386
2023	6,271
2024	4,635
2025	2,843
Total	31,589
Amortization expense	$ 9,100	$ 34,200	$ 17,900

Deferred Charges, Goodwill An_6

Deferred Charges, Goodwill And Other Assets, Net (Schedule Of Cash Flow Hedging, Derivative Financial Instruments On The Income Statement) (Details) - USD ($)	1 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Total Amount of Interest Expense presented in the consolidated statements		$ (80,991,000)	$ (90,569,000)	$ (77,594,000)
Not Designated as Hedging Instrument [Member] | Interest Expense [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income		16,000	3,551,000	2,944,000
Not Designated as Hedging Instrument [Member] | Interest And Other Investment Income (Loss) [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative and Reclassification for Forecasted Transactions No Longer Probable of Occurring			1,926,000	(204,000)
Not Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI on Derivative			(4,682,000)	5,262,000
Total Amount of Interest Expense presented in the consolidated statements		$ (80,991,000)	(90,569,000)	$ (77,594,000)
Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative and Reclassification for Forecasted Transactions No Longer Probable of Occurring			$ 1,900,000
Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative and Reclassification for Forecasted Transactions No Longer Probable of Occurring	$ 25,000

Restricted Cash (Schedule Of Re

Restricted Cash (Schedule Of Restricted Cash) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restricted Cash [Abstract]
Security deposits	$ 5,289	$ 5,677
Escrow and other reserve funds	8,918	9,900
Total restricted cash	$ 14,207	$ 15,577	$ 19,921	$ 39,792

Discontinued Operations (Narrat

Discontinued Operations (Narrative) (Details)	1 Months Ended	12 Months Ended		15 Months Ended
	Jan. 31, 2021USD ($)ft²	Dec. 31, 2020USD ($)ft²propertyitem	Dec. 31, 2019USD ($)ft²item	Dec. 31, 2020USD ($)ft²itemproperty
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Unrealized losses on disposition of rental property		$ (14,040,000)	$ (141,266,000)
Book value		4,638,643,000	4,256,681,000	$ 4,638,643,000
Accumulated depreciation		$ 656,331,000	$ 558,617,000	$ 656,331,000
Area of property sold (in square feet) | ft²			4,490,578
Suburban Office Portfolio [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Area of real estate property held for sale (in square feet) | ft²			6,600,000
Suburban Office Portfolio [Member] | Holmdel, New Jersey [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Area of property (in square feet) | ft²		350,000		350,000
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Properties | property		6
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Disposal Group Three [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of disposal groups | item		3
Unrealized losses on disposition of rental property		$ (14,000,000)
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Properties Disposed One [Member] | Suburban Office Portfolio [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Area of real estate property held for sale (in square feet) | ft²		3,000,000		3,000,000
Number of disposal groups | property		6
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Properties Disposed Two [Member] | Suburban Office Portfolio [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties | property		16		16
Disposal Group, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold | item		20	68
Area of real estate property held for sale (in square feet) | ft²		2,725,639		2,725,639
Sales proceeds		$ 370,754,000	$ 1,052,427,000
Gain (loss) on sale of property		7,163,000	$ 382,151,000
Disposal Group, Not Discontinued Operations [Member] | Suburban Office Portfolio [Member] | Holmdel, New Jersey [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Book value		19,800,000		$ 19,800,000
Accumulated depreciation		10,500,000		10,500,000
Reversal of valuation allowance		$ 2,800,000		$ 2,800,000
Disposal Group, Not Discontinued Operations [Member] | Properties Disposed Two [Member] | Suburban Office Portfolio [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties | property		15		15
Area of property (in square feet) | ft²		2,800,000		2,800,000
Gain (loss) on sale of property		$ 652,400,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Suburban Office Properties [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold | item				20
Gain (loss) on sale of property		$ 377,400,000
Area of property sold (in square feet) | ft²		3,200,000		3,200,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Properties Disposed Three [Member] | Suburban Office Portfolio [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties | property		1		1
Subsequent Event [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Properties Disposed Three [Member] | Suburban Office Portfolio [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Area of property (in square feet) | ft²	149,600
Gain (loss) on sale of property	$ 38,000,000

Discontinued Operations (Summar

Discontinued Operations (Summary Of Income From Discontinued Operations And Related Realized And Unrealized Gains (Losses)) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Discontinued Operations [Abstract]
Total revenues	$ 134,915,000	$ 169,672,000	$ 158,881,000
Operating and other expenses	(54,129,000)	(69,045,000)	(66,528,000)
Depreciation and amortization	(4,806,000)	(71,021,000)	(61,029,000)
Interest expense	(5,256,000)	(5,240,000)	(5,990,000)
Loss from early extinguishment of debt			(1,757,000)
Income from discontinued operations	70,724,000	24,366,000	23,577,000
Unrealized losses on disposition of rental property	(14,040,000)	(141,266,000)
Realized gains (losses) on disposition of rental property	25,241,000	7,916,000
Realized gains (losses) and unrealized losses on disposition of rental property and impairments, net	11,201,000	(133,350,000)
Total discontinued operations, net	$ 81,925,000	$ (108,984,000)	$ 23,577,000

Senior Unsecured Notes (Summary

Senior Unsecured Notes (Summary Of Senior Unsecured Notes) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Principal balance outstanding	$ 2,801,797,000	$ 2,808,518,000
Adjustment for unamortized debt discount	(1,504,000)
Total debt	$ 2,801,797,000
4.500% Senior Unsecured Notes Due April 18, 2022 [Member]
Debt Instrument [Line Items]
Interest rate of senior unsecured notes	4.50%
Maturity date of the senior unsecured notes	Apr. 18, 2022
3.150% Senior Unsecured Notes, Due May 15, 2023 [Member]
Debt Instrument [Line Items]
Interest rate of senior unsecured notes	3.15%
Maturity date of the senior unsecured notes	May 15, 2023
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Principal balance outstanding	$ 575,000,000	575,000,000
Adjustment for unamortized debt discount	(1,504,000)	(2,170,000)
Unamortized deferred financing costs	(843,000)	(1,346,000)
Total debt	572,653,000	571,484,000
Senior Unsecured Notes [Member] | 4.500% Senior Unsecured Notes Due April 18, 2022 [Member]
Debt Instrument [Line Items]
Principal balance outstanding	$ 300,000,000	300,000,000
Effective rate	4.612%
Senior Unsecured Notes [Member] | 3.150% Senior Unsecured Notes, Due May 15, 2023 [Member]
Debt Instrument [Line Items]
Principal balance outstanding	$ 275,000,000	$ 275,000,000
Effective rate	3.517%

Unsecured Revolving Credit Fa_3

Unsecured Revolving Credit Facility And Term Loans (Narrative) (Details)	Mar. 06, 2018	Jan. 25, 2017USD ($)entity	Dec. 31, 2020USD ($)item	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)item	Jan. 07, 2019USD ($)	Mar. 29, 2017	Mar. 22, 2017USD ($)	Jan. 26, 2017USD ($)	Jan. 31, 2016USD ($)
Line of Credit Facility [Line Items]
Loan balance			$ 2,801,797,000	$ 2,808,518,000
Outstanding borrowings under the facility			25,000,000	329,000,000
Gain (Loss) from extinguishment of debt, net			$ (272,000)	1,648,000	$ (10,750,000)
Unsecured Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Number of lending institutions | item						17
Borrowing capacity under the credit facility						$ 600,000,000
Credit facility maturity month and year			July 2017
2017 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Number of lending institutions | entity		13
Borrowing capacity under the credit facility		$ 60,000,000
Credit facility, extension period			6 months
Terms of the unsecured facility			The 2017 Credit Agreement, which applies to both the 2017 Credit Facility and 2017 Term Loan, includes certain restrictions and covenants which limit, among other things the incurrence of additional indebtedness, the incurrence of liens and the disposition of real estate properties (to the extent that: (i) such property dispositions cause the Company to default on any of the financial ratios of the 2017 Credit Agreement (described below), or (ii) the property dispositions are completed while the Company is under an event of default under the 2017 Credit Agreement, unless, under certain circumstances, such disposition is being carried out to cure such default), and which require compliance with financial ratios relating to the maximum leverage ratio (60 percent), the maximum amount of secured indebtedness (40 percent), the minimum amount of fixed charge coverage (1.5 times), the maximum amount of unsecured indebtedness (60 percent), the minimum amount of unencumbered property interest coverage (2.0 times) and certain investment limitations (generally 15 percent of total capitalization).
Terms of dividend restriction			The 2017 Credit Agreement contains “change of control” provisions that permit the lenders to declare a default and require the immediate repayment of all outstanding borrowings under the 2017 Credit Facility. These change of control provisions, which have been included as an event of default under the agreements governing the Company’s revolving credit facilities since June 2000, are triggered if, among other things, a majority of the seats on the Board of Directors (other than vacant seats) become occupied by directors who were neither nominated by the Board Directors nor appointed by a majority of directors nominated by the Board of Directors. Furthermore, the agreements governing the Company's Senior Unsecured Notes include cross-acceleration provisions that would constitute an event of default requiring immediate repayment of the Notes if the change of control provisions under the 2017 Credit Facility are triggered and the lenders declare a default and exercise their rights under the 2017 Credit Facility and accelerate repayment of the outstanding borrowings thereunder. In addition, construction loans secured by two multi-family residential property development projects contain cross-acceleration provisions similar to those in the agreements governing the Notes for defaults by the Company.  If these change of control provisions were triggered, the Company could seek a forbearance, waiver or amendment of the change of control provisions from the lenders, however there can be no assurance that the Company would be able to obtain such forbearance, waiver or amendment on acceptable terms or at all. If an event of default has occurred and is continuing, the entire outstanding balance under the 2017 Credit Agreement may (or, in the case of any bankruptcy event of default, shall) become immediately due and payable, and the Company will not make any excess distributions except to enable the General Partner to continue to qualify as a REIT under the IRS Code.
Spread over LIBOR	1.30%
2017 Credit Facility [Member]
Line of Credit Facility [Line Items]
Borrowing capacity under the credit facility		600,000,000
Number of extension options | item			2
Credit facility, extension period			6 months
Terms of the unsecured facility			The terms of the 2017 Credit Facility include: (1) a four year term ending in January 2021, with two six month extension options, subject to the Company not being in default on the facility and with the payment of a fee of 7.5 basis points for each extension; (2) revolving credit loans may be made to the Company in an aggregate principal amount of up to $600 million (subject to increase as discussed below), with a sublimit under the 2017 Credit Facility for the issuance of letters of credit in an amount not to exceed $60 million (subject to increase as discussed below), of which $10.6 million of letters of credit had been issued as of December 31, 2020; (3) an interest rate, based on the Operating Partnership’s unsecured debt ratings from Moody’s or S&P, or, at the Operating Partnership’s option, if it no longer maintains a debt rating from Moody’s or S&P, or such debt ratings fall below Baa3 and BBB-, based on a defined leverage ratio; and (4) a facility fee, currently 25 basis points, payable quarterly based on the Operating Partnership’s unsecured debt ratings from Moody’s or S&P, or, at the Operating Partnership’s option, if it no longer maintains a debt rating from Moody’s or S&P or such debt ratings fall below Baa3 and BBB-, based on a defined leverage ratio. The Company’s unsecured debt is currently rated B1 by Moody’s and B+ by S&P. In January 2021, the Company elected to exercise the first option to extend the 2017 Credit Facility maturity date for a period of six months. Accordingly, the term of the 2017 Credit Facility was extended to July 2021, with the Company’s payment of the 7.5 basis point extension fee.
Loan period			4 years
Facility fee basis points			0.25%
Mortgage loan, maturity month and year			January 2021
2017 Credit Agreement, Letter Of Credit [Member]
Line of Credit Facility [Line Items]
Maximum loan increase that may be requested										$ 100,000,000
Proceeds from Letters of Credit			$ 10,600,000
2017 Credit Agreement Amendment And 2016 Term Loan Amendment [Member]
Line of Credit Facility [Line Items]
Terms of the unsecured facility			On August 30, 2018, the Company entered into an amendment to the 2017 Credit Agreement (the “2017 Credit Agreement Amendment”) and an amendment to the 2016 Term Loan (the “2016 Term Loan Amendment”). Each of the 2017 Credit Agreement Amendment and the 2016 Term Loan Amendment was effective as of June 30, 2018 and provided for the following material amendments to the terms of both the 2017 Credit Agreement and 2016 Term Loan: 1.The unsecured debt ratio covenant has been modified with respect to the measurement of the unencumbered collateral pool of assets in the calculation of such ratio for the period commencing July 1, 2018 and continuing until December 31, 2019 to allow the Operating Partnership to utilize the “as-is” appraised value of the properties known as ‘Harborside Plaza I’ and ‘Harborside Plaza V’ properties located in Jersey City, NJ in such calculation; and2.A new covenant has been added that prohibits the Company from making any optional or voluntary payment, repayment, repurchase or redemption of any unsecured indebtedness of the Company (or any subsidiaries) that matures after January 25, 2022, at any time when any of the Total Leverage Ratio or the unsecured debt ratio covenants exceeds 60 percent (all as defined in the 2017 Credit Agreement and the 2016 Term Loan) or an appraisal is being used to determine the value of Harborside Plaza I and Harborside Plaza V for the unsecured debt ratio covenant.
2017 Credit Facility, Extension One [Member]
Line of Credit Facility [Line Items]
Credit facility, Maturity month and year			July 2021
Unsecured Term Loan [Member] | Unsecured Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Outstanding borrowings under the facility			$ 25,000,000	329,000,000
5.800% Senior Unsecured Notes, Due January 15, 2016 [Member]
Line of Credit Facility [Line Items]
Loan balance											$ 200,000,000
Loan maturity date			Jan. 15, 2016
2017 Term Loan [Member]
Line of Credit Facility [Line Items]
Loan balance									$ 325,000,000
Unamortized deferred financing costs				253,000
Loan extension period			1 year
Interest rate swap								1.6473%
Interest rate								3.1973%
Borrowing capacity under the credit facility		$ 325,000,000
Number of extension options | item			2
Terms of the unsecured facility			The terms of the 2017 Term Loan included: (1) a three year term ending in January 2020, with two one year extension options; (2) multiple draws of the term loan commitments may be made within 12 months of the effective date of the 2017 Credit Agreement up to an aggregate principal amount of $325 million (subject to increase as discussed below), with no requirement to be drawn in full; provided, that, if the Company does not borrow at least 50 percent of the initial term commitment from the term lenders (i.e. 50 percent of $325 million) on or before July 25, 2017, the amount of unused term loan commitments shall be reduced on such date so that, after giving effect to such reduction, the amount of unused term loan commitments is not greater than the outstanding term loans on such date; (3) an interest rate, based on the Operating Partnership’s unsecured debt ratings from Moody’s or S&P, or, at the Operating Partnership’s option if it no longer maintains a debt rating from Moody’s or S&P or such debt ratings fall below Baa3 and BBB-, based on a defined leverage ratio; and (4) a term commitment fee on any unused term loan commitment during the first 12 months after the effective date of the 2017 Credit Agreement at a rate of 0.25 percent per annum on the sum of the average daily unused portion of the aggregate term loan commitments.
Spread over LIBOR	1.55%
Loan period			3 years
Minimum percentage of initial borrowing			50.00%
Term commitment fee percent			0.25%
Gain on early termination				80,000
Gain (Loss) from extinguishment of debt, net				(173,000)
Mortgage loan, maturity month and year			January 2020
2017 Term Loan [Member] | 2017 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Credit facility extension fee, basis points			7.50%
2017 Term Loan [Member] | 2017 Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility extension fee, basis points			7.50%
Incremental Commitments [Member]
Line of Credit Facility [Line Items]
Maximum loan increase that may be requested										$ 350,000,000
2016 Term Loan [Member]
Line of Credit Facility [Line Items]
Unsecured term loan, net											$ 350,000,000
Unamortized deferred financing costs				242,000
Interest rate			3.28%
Number of extension options | item			2
Credit facility, extension period			1 year
Terms of the unsecured facility			The terms of the 2016 Term Loan include certain restrictions and covenants which limit, among other things the incurrence of additional indebtedness, the incurrence of liens and the disposition of real estate properties (to the extent that: (i) such property dispositions cause the Company to default on any of the financial ratios of the term loan described below, or (ii) the property dispositions are completed while the Company is under an event of default under the term loan, unless, under certain circumstances, such disposition is being carried out to cure such default), and which require compliance with financial ratios relating to the maximum leverage ratio (60 percent), the maximum amount of secured indebtedness (40 percent), the minimum amount of fixed charge coverage (1.5 times), the maximum amount of unsecured indebtedness (60 percent), the minimum amount of unencumbered property interest coverage (2.0 times) and certain investment limitations (generally 15 percent of total capitalization).
Terms of dividend restriction			If an event of default has occurred and is continuing, the Company will not make any excess distributions except to enable the General Partner to continue to qualify as a REIT under the IRS Code.
Spread over LIBOR	1.55%
Gain on early termination				2,100,000
Mortgage loan, maturity month and year			January 2019
2016 Term Loan, Extension One [Member]
Line of Credit Facility [Line Items]
Extension fee amount							$ 500,000
Mortgage loan, maturity month and year			January 2020
2016 and 2017 Term Loan [Member]
Line of Credit Facility [Line Items]
Gain (Loss) from extinguishment of debt, net				$ 1,600,000

Unsecured Revolving Credit Fa_4

Unsecured Revolving Credit Facility And Term Loans (Schedule Of Defined Leverage Ratio, Including Interest Rate, Alternate Base Rate Loans, And Facility Fee) (Details)	12 Months Ended
	Dec. 31, 2020
50% And 55% (Current ratio) Unsecured Term Loan Leverage Ratio [Member] | Minimum [Member]
Debt Instrument [Line Items]
Leverage ratio	50.00%
50% And 55% (Current ratio) Unsecured Term Loan Leverage Ratio [Member] | Maximum [Member]
Debt Instrument [Line Items]
Leverage ratio	55.00%
2017 Credit Facility [Member]
Debt Instrument [Line Items]
Facility Fee Basis Points	0.25%
2017 Credit Facility [Member] | 45% Unsecured Term Loan Leverage Ratio [Member]
Debt Instrument [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR	1.25%
Facility Fee Basis Points	0.20%
2017 Credit Facility [Member] | 45% Unsecured Term Loan Leverage Ratio [Member] | Maximum [Member]
Debt Instrument [Line Items]
Leverage ratio	45.00%
2017 Credit Facility [Member] | 45% And 50% Unsecured Term Loan Leverage Ratio [Member]
Debt Instrument [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR	1.30%
Facility Fee Basis Points	0.25%
2017 Credit Facility [Member] | 45% And 50% Unsecured Term Loan Leverage Ratio [Member] | Minimum [Member]
Debt Instrument [Line Items]
Leverage ratio	45.00%
2017 Credit Facility [Member] | 45% And 50% Unsecured Term Loan Leverage Ratio [Member] | Maximum [Member]
Debt Instrument [Line Items]
Leverage ratio	50.00%
2017 Credit Facility [Member] | 50% And 55% (Current ratio) Unsecured Term Loan Leverage Ratio [Member]
Debt Instrument [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR	1.35%
Facility Fee Basis Points	0.30%
2017 Credit Facility [Member] | 55% Unsecured Term Loan Leverage Ratio [Member]
Debt Instrument [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR	1.60%
Facility Fee Basis Points	0.35%
2017 Credit Facility [Member] | 55% Unsecured Term Loan Leverage Ratio [Member] | Minimum [Member]
Debt Instrument [Line Items]
Leverage ratio	55.00%
2017 Credit Facility [Member] | Base Rate [Member] | 45% Unsecured Term Loan Leverage Ratio [Member]
Debt Instrument [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR	0.25%
2017 Credit Facility [Member] | Base Rate [Member] | 45% And 50% Unsecured Term Loan Leverage Ratio [Member]
Debt Instrument [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR	0.30%
2017 Credit Facility [Member] | Base Rate [Member] | 50% And 55% (Current ratio) Unsecured Term Loan Leverage Ratio [Member]
Debt Instrument [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR	0.35%
2017 Credit Facility [Member] | Base Rate [Member] | 55% Unsecured Term Loan Leverage Ratio [Member]
Debt Instrument [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR	0.60%

Unsecured Revolving Credit Fa_5

Unsecured Revolving Credit Facility And Term Loans (Schedule Of Interest Rates On Outstanding Borrowings, Alternate Base Rate Loans, And Facility Fee) (Details) - 2017 Credit Facility [Member]	12 Months Ended
	Dec. 31, 2020
Line of Credit Facility [Line Items]
Facility Fee Basis Points	0.25%
No Ratings Or Less Than Baa3 [Member] | No Ratings Or Less Than BBB- [Member]
Line of Credit Facility [Line Items]
Unsecured Debt Ratings	No ratings or less than BBB-/Baa3
Interest Rate - Applicable Basis Points Above LIBOR	1.55%
Facility Fee Basis Points	0.30%
Baa3 [Member] | BBB- [Member]
Line of Credit Facility [Line Items]
Unsecured Debt Ratings	BBB- or Baa3 (interest rate based on Company's election through March 5, 2018)
Interest Rate - Applicable Basis Points Above LIBOR	1.20%
Facility Fee Basis Points	0.25%
Baa2 [Member] | BBB [Member]
Line of Credit Facility [Line Items]
Unsecured Debt Ratings	BBB or Baa2
Interest Rate - Applicable Basis Points Above LIBOR	1.00%
Facility Fee Basis Points	0.20%
Baa1 [Member] | BBB+ [Member]
Line of Credit Facility [Line Items]
Unsecured Debt Ratings	BBB+ or Baa1
Interest Rate - Applicable Basis Points Above LIBOR	0.90%
Facility Fee Basis Points	0.15%
A3 Or Higher [Member] | A- Or Higher [Member]
Line of Credit Facility [Line Items]
Unsecured Debt Ratings	A- or A3 or higher
Interest Rate - Applicable Basis Points Above LIBOR	0.875%
Facility Fee Basis Points	0.125%
Base Rate [Member] | No Ratings Or Less Than Baa3 [Member] | No Ratings Or Less Than BBB- [Member]
Line of Credit Facility [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR	0.55%
Base Rate [Member] | Baa3 [Member] | BBB- [Member]
Line of Credit Facility [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR	0.20%
Base Rate [Member] | Baa2 [Member] | BBB [Member]
Line of Credit Facility [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR	0.00%
Base Rate [Member] | Baa1 [Member] | BBB+ [Member]
Line of Credit Facility [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR	0.00%
Base Rate [Member] | A3 Or Higher [Member] | A- Or Higher [Member]
Line of Credit Facility [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR	0.00%

Unsecured Revolving Credit Fa_6

Unsecured Revolving Credit Facility And Term Loans (Schedule Of Unsecured Credit Rating And Facility Fee) (Details) - Unsecured Revolving Credit Facility [Member]	12 Months Ended
	Dec. 31, 2020
No Ratings Or Less Than Baa3 [Member] | No Ratings Or Less Than BBB- [Member]
Line of Credit Facility [Line Items]
Unsecured Debt Ratings	No ratings or less than BBB-/Baa3
Interest Rate - Applicable Basis Points Above LIBOR	1.70%
Facility Fee Basis Points	0.35%
Baa3 [Member] | BBB- [Member]
Line of Credit Facility [Line Items]
Unsecured Debt Ratings	BBB- or Baa3 (since January 2017 amendment)
Interest Rate - Applicable Basis Points Above LIBOR	1.30%
Facility Fee Basis Points	0.30%
Baa2 [Member] | BBB [Member]
Line of Credit Facility [Line Items]
Unsecured Debt Ratings	BBB or Baa2
Interest Rate - Applicable Basis Points Above LIBOR	1.10%
Facility Fee Basis Points	0.20%
Baa1 [Member] | BBB+ [Member]
Line of Credit Facility [Line Items]
Unsecured Debt Ratings	BBB+ or Baa1
Interest Rate - Applicable Basis Points Above LIBOR	1.00%
Facility Fee Basis Points	0.15%
A3 Or Higher [Member] | A- Or Higher [Member]
Line of Credit Facility [Line Items]
Unsecured Debt Ratings	A- or A3 or higher
Interest Rate - Applicable Basis Points Above LIBOR	0.925%
Facility Fee Basis Points	0.125%

Unsecured Revolving Credit Fa_7

Unsecured Revolving Credit Facility And Term Loans (Schedule Of Defined Leverage Ratio) (Details)	12 Months Ended
	Dec. 31, 2020
45% Unsecured 2017 Term Loan Leverage Ratio [Member]
Debt Instrument [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR	1.45%
45% Unsecured 2017 Term Loan Leverage Ratio [Member] | Maximum [Member]
Debt Instrument [Line Items]
Leverage ratio	45.00%
45% And 50% Unsecured 2017 Term Loan Leverage Ratio [Member]
Debt Instrument [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR	1.55%
45% And 50% Unsecured 2017 Term Loan Leverage Ratio [Member] | Minimum [Member]
Debt Instrument [Line Items]
Leverage ratio	45.00%
45% And 50% Unsecured 2017 Term Loan Leverage Ratio [Member] | Maximum [Member]
Debt Instrument [Line Items]
Leverage ratio	50.00%
50% And 55% (Current ratio) Unsecured 2017 Term Loan Leverage Ratio [Member]
Debt Instrument [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR	1.65%
50% And 55% (Current ratio) Unsecured 2017 Term Loan Leverage Ratio [Member] | Minimum [Member]
Debt Instrument [Line Items]
Leverage ratio	50.00%
50% And 55% (Current ratio) Unsecured 2017 Term Loan Leverage Ratio [Member] | Maximum [Member]
Debt Instrument [Line Items]
Leverage ratio	55.00%
55% Unsecured 2017 Term Loan Leverage Ratio [Member]
Debt Instrument [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR	1.95%
55% Unsecured 2017 Term Loan Leverage Ratio [Member] | Minimum [Member]
Debt Instrument [Line Items]
Leverage ratio	55.00%
45% Unsecured 2016 Term Loan Leverage Ratio [Member]
Debt Instrument [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR	1.45%
45% Unsecured 2016 Term Loan Leverage Ratio [Member] | Maximum [Member]
Debt Instrument [Line Items]
Leverage ratio	45.00%
45% And 50% Unsecured 2016 Term Loan Leverage Ratio [Member]
Debt Instrument [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR	1.55%
45% And 50% Unsecured 2016 Term Loan Leverage Ratio [Member] | Minimum [Member]
Debt Instrument [Line Items]
Leverage ratio	45.00%
45% And 50% Unsecured 2016 Term Loan Leverage Ratio [Member] | Maximum [Member]
Debt Instrument [Line Items]
Leverage ratio	50.00%
50% And 55% (Current ratio) Unsecured 2016 Term Loan Leverage Ratio [Member]
Debt Instrument [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR	1.65%
50% And 55% (Current ratio) Unsecured 2016 Term Loan Leverage Ratio [Member] | Minimum [Member]
Debt Instrument [Line Items]
Leverage ratio	50.00%
50% And 55% (Current ratio) Unsecured 2016 Term Loan Leverage Ratio [Member] | Maximum [Member]
Debt Instrument [Line Items]
Leverage ratio	55.00%
55% Unsecured 2016 Term Loan Leverage Ratio [Member]
Debt Instrument [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR	1.95%
55% Unsecured 2016 Term Loan Leverage Ratio [Member] | Minimum [Member]
Debt Instrument [Line Items]
Leverage ratio	55.00%
Base Rate [Member] | 45% Unsecured 2017 Term Loan Leverage Ratio [Member]
Debt Instrument [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR	0.45%
Base Rate [Member] | 45% And 50% Unsecured 2017 Term Loan Leverage Ratio [Member]
Debt Instrument [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR	0.55%
Base Rate [Member] | 50% And 55% (Current ratio) Unsecured 2017 Term Loan Leverage Ratio [Member]
Debt Instrument [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR	0.65%
Base Rate [Member] | 55% Unsecured 2017 Term Loan Leverage Ratio [Member]
Debt Instrument [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR	0.95%

Unsecured Revolving Credit Fa_8

Unsecured Revolving Credit Facility And Term Loans (Schedule Of Interest Rate On Outstanding Borrowings Payable) (Details)	Mar. 06, 2018	Dec. 31, 2020
2017 Term Loan [Member]
Line of Credit Facility [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR	1.55%
2016 Term Loan [Member]
Line of Credit Facility [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR	1.55%
No Ratings Or Less Than Baa3 [Member] | 2017 Term Loan [Member] | No Ratings Or Less Than BBB- [Member]
Line of Credit Facility [Line Items]
Unsecured Debt Ratings		No ratings or less than BBB-/Baa3
No Ratings Or Less Than Baa3 [Member] | 2016 Term Loan [Member] | No Ratings Or Less Than BBB- [Member]
Line of Credit Facility [Line Items]
Unsecured Debt Ratings		No ratings or less than BBB-/Baa3
Interest Rate - Applicable Basis Points Above LIBOR		1.85%
Baa3 [Member] | 2017 Term Loan [Member] | BBB- [Member]
Line of Credit Facility [Line Items]
Unsecured Debt Ratings		BBB- or Baa3 (interest rate based on Company's election through March 5, 2018)
Baa3 [Member] | 2016 Term Loan [Member] | BBB- [Member]
Line of Credit Facility [Line Items]
Unsecured Debt Ratings		BBB- or Baa3 (interest rate based on Company's election through March 5, 2018)
Interest Rate - Applicable Basis Points Above LIBOR		1.40%
Baa2 [Member] | 2017 Term Loan [Member] | BBB [Member]
Line of Credit Facility [Line Items]
Unsecured Debt Ratings		BBB or Baa2
Baa2 [Member] | 2016 Term Loan [Member] | BBB [Member]
Line of Credit Facility [Line Items]
Unsecured Debt Ratings		BBB or Baa2
Interest Rate - Applicable Basis Points Above LIBOR		1.15%
Baa1 [Member] | 2017 Term Loan [Member] | BBB+ [Member]
Line of Credit Facility [Line Items]
Unsecured Debt Ratings		BBB+ or Baa1
Baa1 [Member] | 2016 Term Loan [Member] | BBB+ [Member]
Line of Credit Facility [Line Items]
Unsecured Debt Ratings		BBB+ or Baa1
Interest Rate - Applicable Basis Points Above LIBOR		1.00%
A3 Or Higher [Member] | 2017 Term Loan [Member] | A- Or Higher [Member]
Line of Credit Facility [Line Items]
Unsecured Debt Ratings		A- or A3 or higher
A3 Or Higher [Member] | 2016 Term Loan [Member] | A- Or Higher [Member]
Line of Credit Facility [Line Items]
Unsecured Debt Ratings		A- or A3 or higher
Interest Rate - Applicable Basis Points Above LIBOR		0.90%
Base Rate [Member] | No Ratings Or Less Than Baa3 [Member] | 2016 Term Loan [Member] | No Ratings Or Less Than BBB- [Member]
Line of Credit Facility [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR		0.85%
Base Rate [Member] | Baa3 [Member] | 2016 Term Loan [Member] | BBB- [Member]
Line of Credit Facility [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR		0.40%
Base Rate [Member] | Baa2 [Member] | 2016 Term Loan [Member] | BBB [Member]
Line of Credit Facility [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR		0.15%
Base Rate [Member] | Baa1 [Member] | 2016 Term Loan [Member] | BBB+ [Member]
Line of Credit Facility [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR		0.00%
Base Rate [Member] | A3 Or Higher [Member] | 2016 Term Loan [Member] | A- Or Higher [Member]
Line of Credit Facility [Line Items]
Interest Rate - Applicable Basis Points Above LIBOR		0.00%

Mortgages, Loans Payable And _3

Mortgages, Loans Payable And Other Obligations (Narrative) (Details)	12 Months Ended
	Dec. 31, 2020USD ($)itemproperty	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Debt Instrument [Line Items]
Cash paid for interest	$ 103,543,000	$ 108,277,000	$ 97,744,000
Interest capitalized	26,443,000	19,325,000	27,047,000
Total indebtedness	2,801,797,000
Adjusted total indebtedness	$ 2,801,797,000	$ 2,808,518,000
Total indebtedness, weighted average interest rate	3.76%	3.81%
Discontinued Operations [Member]
Debt Instrument [Line Items]
Cash paid for interest	$ 5,139,000	$ 5,125,000	6,280,000
Projects Under Development And Developable Land [Member]
Debt Instrument [Line Items]
Number of projects with encumbered company mortgages | item	3
Carrying value of encumbered properties	$ 585,000,000
Other Property [Member]
Debt Instrument [Line Items]
Number of properties with encumbered company mortgages | property	19
Carrying value of encumbered properties	$ 2,900,000,000
Unconsolidated Joint Venture [Member]
Debt Instrument [Line Items]
Interest capitalized	1,367,000	1,339,000	$ 816,000
Revolving Credit Facility Borrowing And Other Variable Rate Mortgage Debt [Member]
Debt Instrument [Line Items]
Total indebtedness	$ 427,419,000	$ 509,656,000
Total indebtedness, weighted average interest rate	3.38%	3.54%
Fixed Rate Debt And Other Obligations [Member]
Debt Instrument [Line Items]
Total indebtedness	$ 2,374,378,000	$ 2,298,862,000
Total indebtedness, weighted average interest rate	3.83%	3.87%

Mortgages, Loans Payable And _4

Mortgages, Loans Payable And Other Obligations (Summary Of Mortgages, Loans Payable And Other Obligations) (Details)	1 Months Ended			12 Months Ended
	Dec. 31, 2020USD ($)	Nov. 30, 2020	Jan. 31, 2020USD ($)	Dec. 31, 2020USD ($)item	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Debt Instrument [Line Items]
Principal balance outstanding	$ 2,801,797,000			$ 2,801,797,000	$ 2,808,518,000
Payment for borrowings				516,000,000	617,000,000	$ 494,000,000
Secured Debt [Member]
Debt Instrument [Line Items]
Principal balance outstanding	2,218,862,000			2,218,862,000	1,925,038,000
Unamortized deferred financing costs	(14,718,000)			(14,718,000)	(17,004,000)
Total mortgages, loans payable and other obligations, net	$ 2,204,144,000			$ 2,204,144,000	1,908,034,000
Secured Debt [Member] | Port Imperial South 4/5 Retail [Member]
Debt Instrument [Line Items]
Property Name				Port Imperial South 4/5 Retail
Lender				American General Life & A/G PC
Effective rate	4.56%			4.56%
Principal balance outstanding	$ 3,866,000			$ 3,866,000	3,934,000
Loan maturity date				Dec. 1, 2021
Secured Debt [Member] | Port Imperial 4/5 Hotel [Member]
Debt Instrument [Line Items]
Property Name				Port Imperial 4/5 Hotel (b)
Lender				Fifth Third Bank
Effective rate	3.40%			3.40%
Principal balance outstanding	$ 94,000,000			$ 94,000,000	74,000,000
Loan maturity date				Apr. 9, 2022
Guaranteed amount	$ 19,500,000			$ 19,500,000
Secured Debt [Member] | Port Imperial South 9 [Member]
Debt Instrument [Line Items]
Property Name				Port Imperial South 9 (c)
Lender				Bank of New York Mellon
Effective rate	2.13%			2.13%
Principal balance outstanding	$ 46,357,000			$ 46,357,000	11,615,000
Loan maturity date				Dec. 19, 2022
Secured Debt [Member] | Port Imperial South 9 [Member] | Construction Loan [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 92,000,000			$ 92,000,000
Number of extension options | item				1
Loan extension period				1 year
Extension fee				0.15%
Percent of principal loan outstanding				10.00%
Secured Debt [Member] | Portside 7 [Member]
Debt Instrument [Line Items]
Property Name				Portside 7
Lender				CBRE Capital Markets/FreddieMac
Effective rate	3.57%			3.57%
Principal balance outstanding	$ 58,998,000			$ 58,998,000	58,998,000
Loan maturity date				Aug. 1, 2023
Secured Debt [Member] | Short Hills Residential [Member]
Debt Instrument [Line Items]
Property Name				Short Hills Residential (d)
Lender				People's United Bank
Effective rate	2.15%			2.15%
Principal balance outstanding	$ 42,459,000			$ 42,459,000	9,431,000
Loan maturity date				Mar. 26, 2023
Secured Debt [Member] | Short Hills Residential [Member] | Construction Loan [Member]
Debt Instrument [Line Items]
Number of extension options | item				1
Loan extension period				18 months
Percent of principal loan outstanding				15.00%
Secured Debt [Member] | 250 Johnson Road [Member]
Debt Instrument [Line Items]
Property Name				250 Johnson
Lender				Nationwide Life Insurance Company
Effective rate	3.74%			3.74%
Principal balance outstanding	$ 43,000,000			$ 43,000,000	43,000,000
Loan maturity date				Aug. 1, 2024
Secured Debt [Member] | Liberty Towers [Member]
Debt Instrument [Line Items]
Property Name				Liberty Towers (e)
Lender				American General Life Insurance Company
Effective rate	3.37%			3.37%
Principal balance outstanding	$ 265,000,000			$ 265,000,000	232,000,000
Loan maturity date				Oct. 1, 2024
Secured Debt [Member] | Liberty Towers [Member] | Construction Loan [Member]
Debt Instrument [Line Items]
Payment for borrowings			$ 265,000,000
Additional borrowing capacity			$ 33,000,000
Secured Debt [Member] | The Charlotte [Member]
Debt Instrument [Line Items]
Property Name				The Charlotte (f)
Lender				QuadReal Finance
Effective rate	2.70%			2.70%
Principal balance outstanding	$ 161,544,000			$ 161,544,000	5,144,000
Loan maturity date				Dec. 1, 2024
Secured Debt [Member] | The Charlotte [Member] | Construction Loan [Member]
Debt Instrument [Line Items]
Spread over LIBOR				2.00%
Maximum borrowing capacity	$ 300,000,000			$ 300,000,000
Number of extension options | item				1
Loan extension period				1 year
Extension fee				25.00%
Secured Debt [Member] | Portside 5/6 [Member]
Debt Instrument [Line Items]
Property Name				Portside 5/6 (g)
Lender				New York Life Insurance Company
Effective rate	4.56%			4.56%
Principal balance outstanding	$ 97,000,000			$ 97,000,000	97,000,000
Loan maturity date				Mar. 10, 2026
Percent of principal loan outstanding				10.00%
Secured Debt [Member] | Marbella [Member]
Debt Instrument [Line Items]
Property Name				Marbella (BLVD 425)
Lender				New York Life Insurance Company
Effective rate	4.17%			4.17%
Principal balance outstanding	$ 131,000,000			$ 131,000,000	131,000,000
Loan maturity date				Aug. 10, 2026
Secured Debt [Member] | Marbella II [Member]
Debt Instrument [Line Items]
Property Name				Marbella II (BLVD 401)
Lender				New York Life Insurance Company
Effective rate	4.29%			4.29%
Principal balance outstanding	$ 117,000,000			$ 117,000,000	117,000,000
Loan maturity date				Aug. 10, 2026
Secured Debt [Member] | 101 Hudson [Member]
Debt Instrument [Line Items]
Property Name				101 Hudson
Lender				Wells Fargo CMBS
Effective rate	3.20%			3.20%
Principal balance outstanding	$ 250,000,000			$ 250,000,000	250,000,000
Loan maturity date				Oct. 11, 2026
Secured Debt [Member] | Worcester [Member]
Debt Instrument [Line Items]
Property Name				Worcester
Lender				MUFG Union Bank
Effective rate	1.84%			1.84%
Principal balance outstanding	$ 63,000,000			$ 63,000,000	63,000,000
Loan maturity date				Dec. 10, 2026
Secured Debt [Member] | Short Hills Portfolio [Member]
Debt Instrument [Line Items]
Property Name				Short Hills Portfolio (h)
Lender				Wells Fargo CMBS
Effective rate	4.15%			4.15%
Principal balance outstanding	$ 124,500,000			$ 124,500,000	124,500,000
Loan maturity date				Apr. 1, 2027
Secured Debt [Member] | Short Hills Portfolio [Member] | Construction Loan [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 64,000,000			$ 64,000,000
Extension fee				0.30%
Secured Debt [Member] | 150 Main St [Member]
Debt Instrument [Line Items]
Property Name				150 Main St.
Lender				Natixis Real Estate Capital LLC
Effective rate	4.48%			4.48%
Principal balance outstanding	$ 41,000,000			$ 41,000,000	41,000,000
Loan maturity date				Aug. 5, 2027
Secured Debt [Member] | Monaco (BLVD 495 N/S) [Member]
Debt Instrument [Line Items]
Property Name				Monaco (BLVD 495 N/S) (l)
Lender				The Northwestern Mutual Life Insurance Co.
Effective rate	2.91%			2.91%
Principal balance outstanding	$ 165,000,000			$ 165,000,000	166,752,000
Loan maturity date	Nov. 10, 2027	Feb. 1, 2021		Nov. 10, 2027
Secured Debt [Member] | Port Imperial South 11 [Member]
Debt Instrument [Line Items]
Property Name				Port Imperial South 11
Lender				The Northwestern Mutual Life Insurance Co.
Effective rate	4.52%			4.52%
Principal balance outstanding	$ 100,000,000			$ 100,000,000	100,000,000
Loan maturity date				Jan. 10, 2029
Secured Debt [Member] | Soho Lofts [Member]
Debt Instrument [Line Items]
Property Name				Soho Lofts (i)
Lender				New York Community Bank
Effective rate	3.77%			3.77%
Principal balance outstanding	$ 160,000,000			$ 160,000,000	160,000,000
Loan maturity date				Jul. 1, 2029
First period of term period				5 years
Secured Debt [Member] | Riverwatch Commons [Member]
Debt Instrument [Line Items]
Property Name				Riverwatch Commons
Lender				New York Community Bank
Principal balance outstanding					30,000,000
Effective percentage after five years	2.75%			2.75%
Secured Debt [Member] | 111 River St. [Member]
Debt Instrument [Line Items]
Property Name				111 River St.
Lender				Athene Annuity and Life Company
Effective rate	3.90%			3.90%
Principal balance outstanding	$ 150,000,000			$ 150,000,000	150,000,000
Loan maturity date				Sep. 1, 2029
Secured Debt [Member] | Port Imperial South 4/5 Garage [Member]
Debt Instrument [Line Items]
Property Name				Port Imperial South 4/5 Garage (j)
Lender				American General Life & A/G PC
Effective rate	4.85%			4.85%
Principal balance outstanding	$ 33,138,000			$ 33,138,000	32,600,000
Loan maturity date				Dec. 1, 2029
Deferred interest				$ 800,000
Deferred interest and principal payment period				6 months
Deferred interest and payment end date				Dec. 1, 2020
Secured Debt [Member] | Emery At Overlook Ridge [Member]
Debt Instrument [Line Items]
Property Name				Emery at Overlook Ridge (k)
Lender				New York Community Bank
Effective rate	3.21%			3.21%
Principal balance outstanding	$ 72,000,000			$ 72,000,000	$ 24,064,000
Loan maturity date	Jan. 1, 2031			Jan. 1, 2031
Mortgage loan	$ 72,000,000			$ 72,000,000
Gain (loss) on sale of property	$ 10,400,000

Mortgages, Loans Payable And _5

Mortgages, Loans Payable And Other Obligations (Schedule Of Principal Payments) (Details) $ in Thousands	Dec. 31, 2020USD ($)
Debt Disclosure [Abstract]
Scheduled Amortization, 2021	$ 590
Scheduled Amortization, 2022	550
Scheduled Amortization, 2023	2,047
Scheduled Amortization, 2024	3,403
Scheduled Amortization, 2025	3,300
Schedule Amortization 2026	12,822
Scheduled Amortization, Sub-total	22,712
Adjustment for unamortized debt discount/premium, net December 31, 2020	(1,504)
Unamortized deferred financing costs	(15,561)
Scheduled Amortization, Total	5,647
Principal Maturities, 2021	28,800
Principal Maturities, 2022	440,357
Principal Maturities, 2023	376,457
Principal Maturities, 2024	469,545
Principal Maturities, 2026	658,000
Principal Maturities, Thereafter	822,991
Principal Maturities, Sub-total	2,796,150
Principal Maturities, Total	2,796,150
Total, 2021	29,390
Total, 2022	440,907
Total, 2023	378,504
Total, 2024	472,948
Total, 2025	3,300
Total, 2026	670,822
Total, Thereafter	822,991
Total, Sub-total	2,818,862
Adjustment for unamortized debt discount/premium, net December 31, 2020	(1,504)
Total, Unamortized deferred financing costs	(15,561)
Total debt	$ 2,801,797

Employee Benefit 401(k) Plans (

Employee Benefit 401(k) Plans (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Minimum employee subscription rate, percentage of compensation	1.00%
Maximum employee subscription rate, percentage of compensation	60.00%
Employee pre-tax contributions vested percentage	100.00%
Vesting rate	20.00%
Percentage vested after total service period	100.00%
Employees' vesting rights	Participants are always 100 percent vested in their pre-tax contributions and will begin vesting in any matching or profit sharing contributions made on their behalf after two years of service with the Company at a rate of 20 percent per year, becoming 100 percent vested after a total of six years of service with the Company.
Expenses for employee benefit plan	$ 771,000	$ 773,000	$ 886,000
Minimum [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Employer contribution vesting period	2 years
Maximum [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Employer contribution vesting period	6 years

Disclosure Of Fair Value Of A_3

Disclosure Of Fair Value Of Assets And Liabilities (Narrative) (Details)	1 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2020property	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)propertyitem	Dec. 31, 2019USD ($)propertyitem	Dec. 31, 2018USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of Company's long-term debt			$ 2,879,002,000	$ 2,791,629,000
Principal balance outstanding			2,801,797,000	2,808,518,000
Land and other impairments			16,817,000	$ 32,444,000	$ 24,566,000
Property impairments		$ 36,600,000	36,582,000
Parsippany, Madison, Short Hills, Edison, And Red Bank, New Jersey [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unrealized losses on rental properties held for sale			$ (15,700,000)
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Properties | property			6
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Parsippany, Madison, Short Hills, Edison, And Red Bank, New Jersey [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Number of properties held for sale | property			6
Number of disposal groups | item			3	6
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Office [Member] | Fort Lee, Newark, Paramus, Bridgewater, Morris Plains And Rahway, New Jersey [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Number of properties held for sale | property				35
Number of properties not expected to recover from estimated net sales proceeds | property				20
Unrealized losses on rental properties held for sale				$ 164,400,000
Properties aggregate net book value				966,000,000
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Office [Member] | Parsippany, Madison, Short Hills, Edison, And Red Bank, New Jersey [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Number of properties held for sale | property			16
Number of properties not expected to recover from estimated net sales proceeds | property			6
Unrealized losses on rental properties held for sale			$ (15,700,000)
Properties aggregate net book value			657,000,000
Land and other impairments			$ 9,500,000
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Hotel [Member] | Weehawken, New Jersey [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Property impairments		$ 36,600,000
Properties | property			2
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Land Parcels [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Land and other impairments			$ 7,300,000
Properties | property			3
Disposal Group, Not Discontinued Operations [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unrealized losses on rental properties held for sale			$ (1,682,000)	(39,049,000)
Disposal Group, Not Discontinued Operations [Member] | Hotel [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Number of properties closed | property	1
Disposal Group, Not Discontinued Operations [Member] | Hotel [Member] | Weehawken, New Jersey [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Properties | property			2
Number of properties closed | property	1
Discontinued Operations [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unrealized losses on rental properties held for sale			$ (14,040,000)	$ (135,052,000)
Discontinued Operations [Member] | Parsippany, Madison, Short Hills, Edison, And Red Bank, New Jersey [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unrealized losses on rental properties held for sale			(14,000,000)
Land and other impairments			$ 9,500,000

Disclosure Of Fair Value Of A_4

Disclosure Of Fair Value Of Assets And Liabilities (Schedule Of Valuation Techniques And Significant Unobservable Assumptions) (Details) - Level 3 [Member] $ in Thousands	Dec. 31, 2020USD ($)
Measurement Assumptions, Discount Rates [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Hotel properties	10
Measurement Assumptions, Exit Capitalization Rates [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Hotel properties	7.5
Measurement Assumptions, Market Rental Rates Per Square Foot [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Land properties held for sale	12
Minimum [Member] | Measurement Assumptions, Discount Rates [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Office properties held for sale	7.5
Minimum [Member] | Measurement Assumptions, Exit Capitalization Rates [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Office properties held for sale	7.5
Minimum [Member] | Measurement Assumptions, Market Rental Rates Per Square Foot [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Office properties held for sale	27.50
Minimum [Member] | Measurement Assumptions, Market Rates Per Residential Unit [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Land held for sale, fair value	$ 32,000
Maximum [Member] | Measurement Assumptions, Discount Rates [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Office properties held for sale	10
Maximum [Member] | Measurement Assumptions, Exit Capitalization Rates [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Office properties held for sale	9
Maximum [Member] | Measurement Assumptions, Market Rental Rates Per Square Foot [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Office properties held for sale	37
Maximum [Member] | Measurement Assumptions, Market Rates Per Residential Unit [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Land held for sale, fair value	$ 40,000

Commitments And Contingencies_2

Commitments And Contingencies (Tax Abatement Agreements) (Narrative) (Details) - USD ($) $ in Millions	11 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Harborside Plaza 4-A [Member]
Commitments And Contingencies [Line Items]
Project period		20 years
Percentage of PILOT on project costs		2.00%
Total project costs		$ 49.5
Payments in lieu of property taxes (PILOT)		$ 1.1	$ 1.1	$ 1.1
Harborside Plaza 5 [Member]
Commitments And Contingencies [Line Items]
Project period		20 years
Percentage of PILOT on project costs		2.00%
Total project costs		$ 170.9
Payments in lieu of property taxes (PILOT)		$ 4.4	4.4	4.4
Port Imperial South 1/3 Garage [Member]
Commitments And Contingencies [Line Items]
Project period		5 years
Percentage of taxes paid based on the land value		100.00%
Port Imperial South 1/3 Garage [Member] | Tax Year 1 [Member]
Commitments And Contingencies [Line Items]
Annual percentage of cost for phase in		0.00%
Port Imperial South 1/3 Garage [Member] | Tax Year 2 [Member]
Commitments And Contingencies [Line Items]
Annual percentage of cost for phase in		95.00%
Port Imperial South 1/3 Garage [Member] | Tax Year 3 [Member]
Commitments And Contingencies [Line Items]
Annual percentage of cost for phase in		95.00%
Port Imperial South 1/3 Garage [Member] | Tax Year 4 [Member]
Commitments And Contingencies [Line Items]
Annual percentage of cost for phase in		95.00%
Port Imperial South 1/3 Garage [Member] | Tax Year 5 [Member]
Commitments And Contingencies [Line Items]
Annual percentage of cost for phase in		95.00%
Port Imperial Hotel Development [Member]
Commitments And Contingencies [Line Items]
Project period		15 years
Percentage of PILOT on project costs		2.00%
Payments in lieu of property taxes (PILOT)		$ 2.2	2.2
Port Imperial South 11 Development [Member]
Commitments And Contingencies [Line Items]
Project period		15 years
Payments in lieu of property taxes (PILOT)		$ 1.1	1
Percentage of PILOT on gross revenues		10.00%
111 River Realty [Member]
Commitments And Contingencies [Line Items]
Payments in lieu of property taxes (PILOT)		$ 1.4	1.4	1.4
Monaco (BLVD 495 N/S) [Member]
Commitments And Contingencies [Line Items]
Project period		10 years
Payments in lieu of property taxes (PILOT)		$ 1.8	$ 2.1	$ 2.4
Percentage of PILOT on gross revenues		10.00%
Marbella II [Member]
Commitments And Contingencies [Line Items]
Project period		10 years
Payments in lieu of property taxes (PILOT)	$ 1.4
Marbella II [Member] | Years 1-4 [Member]
Commitments And Contingencies [Line Items]
Percentage of PILOT on gross revenues		10.00%
Marbella II [Member] | Years 5-8 [Member]
Commitments And Contingencies [Line Items]
Percentage of PILOT on gross revenues		12.00%
Marbella II [Member] | Years 9-10 [Member]
Commitments And Contingencies [Line Items]
Percentage of PILOT on gross revenues		14.00%
Port Imperial South 9 [Member]
Commitments And Contingencies [Line Items]
Total project costs		$ 143.8
Port Imperial South Parcel 8/9 [Member]
Commitments And Contingencies [Line Items]
Project period		25 years
Percentage of PILOT on gross revenues		10.00%
Port Imperial South Parcel 8/9 [Member] | Years 1-10 [Member]
Commitments And Contingencies [Line Items]
Percentage of PILOT on gross revenues		11.00%
Port Imperial South Parcel 8/9 [Member] | Years 11-18 [Member]
Commitments And Contingencies [Line Items]
Percentage of PILOT on gross revenues		12.50%
Port Imperial South Parcel 8/9 [Member] | Years 19-25 [Member]
Commitments And Contingencies [Line Items]
Percentage of PILOT on gross revenues		14.00%

Commitments And Contingencies_3

Commitments And Contingencies (Ground Lease Agreements) (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)property	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Lessee, Lease, Description [Line Items]
Ground lease expense incurred	$ 1,600	$ 2,600	$ 2,300
Operating lease	$ 23,602	$ 23,756
Number of ground leases | property	3
Minimum [Member]
Lessee, Lease, Description [Line Items]
Term of lease contract	80 years 9 months 29 days
Borrowing rate	7.576%
Maximum [Member]
Lessee, Lease, Description [Line Items]
Term of lease contract	82 years 6 months 29 days
Borrowing rate	7.618%
Accounting Standards Update 2016-02 [Member]
Lessee, Lease, Description [Line Items]
Operating lease	$ 22,300

Commitments And Contingencies_4

Commitments And Contingencies (Construction Projects) (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)item	Dec. 31, 2019USD ($)item	Dec. 31, 2018USD ($)
Commitments And Contingencies [Line Items]
Costs of the project incurred	$ 13,717	$ 17,881	$ 23,799
Number of units | item	326	208
Amount outstanding	$ 25,000	$ 329,000
Port Imperial South 9 [Member]
Commitments And Contingencies [Line Items]
Delivery date to tenant	2021
Number of units | item	313
Amount outstanding	$ 46,300
Amount of project costs funded	51,800
Total project costs	143,800
The Upton At Short Hills [Member]
Commitments And Contingencies [Line Items]
Costs of the project incurred	$ 77,900
Delivery date to tenant	first quarter 2021
Number of units | item	198
Amount outstanding	$ 42,500
Amount of project costs funded	35,400
Total project costs	99,400
25 Christopher Columbus [Member]
Commitments And Contingencies [Line Items]
Costs of the project incurred	$ 331,000
Delivery date to tenant	first quarter 2022
Number of units | item	750
Amount outstanding	$ 161,500
Total project costs	469,500
Amount to fund	169,500
Construction Loan [Member] | Port Imperial South 9 [Member]
Commitments And Contingencies [Line Items]
Development costs	98,100
Amount outstanding	92,000
Construction Loan [Member] | The Upton At Short Hills [Member]
Commitments And Contingencies [Line Items]
Amount outstanding	64,000
Construction Loan [Member] | 25 Christopher Columbus [Member]
Commitments And Contingencies [Line Items]
Amount outstanding	$ 300,000

Commitments And Contingencies_5

Commitments And Contingencies (Management Changes) (Narrative) (Details) - USD ($)	Nov. 03, 2020	Jun. 05, 2015	Dec. 31, 2020
Changes In Executive Officers [Line Items]
Shares granted		800,000
Exercisable period			10 years
Messr DeMarco, CEO [Member]
Changes In Executive Officers [Line Items]
Annual bonus opportunity percentage			175.00%
David Smetana [Member] | Maximum [Member]
Changes In Executive Officers [Line Items]
Annual bonus opportunity percentage	150.00%
Ricardo Cardoso [Member] | Maximum [Member]
Changes In Executive Officers [Line Items]
Annual bonus opportunity percentage	200.00%
Messr DeBari [Member] | Maximum [Member]
Changes In Executive Officers [Line Items]
Annual bonus opportunity percentage	60.00%
MAG Partners [Member]
Changes In Executive Officers [Line Items]
Shares granted			157,505
Cash payment			$ 150,000
Monthly fee			150,000
One-time bonus			300,000
One-time completion bonus			200,000
Legal fees			$ 10,000
Common Class At $14.39 [Member] | MAG Partners [Member] | Maximum [Member]
Changes In Executive Officers [Line Items]
Number of shares authorized			230,000
Share price issued			$ 14.39
Common Class At $20.00 [Member] | MAG Partners [Member] | Maximum [Member]
Changes In Executive Officers [Line Items]
Number of shares authorized			100,000
Share price issued			$ 20
Employee Severance [Member]
Changes In Executive Officers [Line Items]
Restructuring costs			$ 11,900,000
General and administration expense			10,100,000
Operating services			$ 1,800,000

Commitments And Contingencies_6

Commitments And Contingencies (Other) (Narrative) (Details)	Nov. 03, 2020USD ($)	Jun. 05, 2015shares	Apr. 30, 2021USD ($)	Jan. 31, 2021USD ($)shares	Nov. 30, 2020USD ($)	Sep. 30, 2020USD ($)item	Dec. 31, 2020USD ($)propertyemployeeitemshares	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Commitments And Contingencies [Line Items]
Period for continuation of health insurance	18 months
Number of payments | item						3
Reimbursement expense						$ 6,100,000
General and administrative							$ 73,641,000	$ 59,805,000	$ 53,869,000
Shares granted | shares		800,000
Stay-On Award Agreement [Member]
Commitments And Contingencies [Line Items]
Number of employees | employee							38
Potential shares | shares							116,043
Exercisable time period							7 years
Bow Street LLC [Member]
Commitments And Contingencies [Line Items]
Number of payments | item							3
Reimbursement expense						6,100,000
General and administrative						$ 6,100,000	$ 6,100,000
Payments for fees and expenses					$ 2,100,000
Property Lock-Ups Expired [Member]
Commitments And Contingencies [Line Items]
Number of properties | property							16
Properties aggregate net book value							$ 1,500,000,000
Subsequent Event [Member] | Bow Street LLC [Member]
Commitments And Contingencies [Line Items]
Payments for fees and expenses				$ 2,000,000
Maximum [Member] | Stay-On Award Agreement [Member]
Commitments And Contingencies [Line Items]
Cost of awards							$ 5,200,000
David Smetana [Member]
Commitments And Contingencies [Line Items]
Annual base salary	$ 450,000
Annual bonus opportunity threshold percentage	50.00%
Annual base salary for target performance	100.00%
David Smetana [Member] | Maximum [Member]
Commitments And Contingencies [Line Items]
Annual bonus opportunity percentage	150.00%
Ricardo Cardoso [Member]
Commitments And Contingencies [Line Items]
Annual base salary	$ 550,000
Annual bonus opportunity threshold percentage	50.00%
Annual base salary for target performance	100.00%
Ricardo Cardoso [Member] | LTIP Units [Member]
Commitments And Contingencies [Line Items]
Percent of estimated net asset	85.00%
Threshold performance in sales volume	$ 500,000,000
Target performance sales volume	700,000,000
Maximum performance sales volume	900,000,000
Target grant date value	$ 2,000,000
Ricardo Cardoso [Member] | Subsequent Event [Member] | LTIP Units [Member]
Commitments And Contingencies [Line Items]
Shares granted | shares				334,449
Ricardo Cardoso [Member] | Minimum [Member] | LTIP Units [Member]
Commitments And Contingencies [Line Items]
Earning threshold	0.00%
Ricardo Cardoso [Member] | Maximum [Member]
Commitments And Contingencies [Line Items]
Annual bonus opportunity percentage	200.00%
Ricardo Cardoso [Member] | Maximum [Member] | LTIP Units [Member]
Commitments And Contingencies [Line Items]
Earning threshold	200.00%
Gary T. Wagner [Member]
Commitments And Contingencies [Line Items]
Annual base salary	$ 450,000
Annual bonus opportunity threshold percentage	50.00%
Annual base salary for target performance	100.00%
Gary T. Wagner [Member] | Maximum [Member]
Commitments And Contingencies [Line Items]
Annual bonus opportunity threshold percentage	150.00%
Messr DeBari [Member]
Commitments And Contingencies [Line Items]
Annual base salary	$ 450,000
Annual bonus opportunity threshold percentage	20.00%
Annual base salary for target performance	40.00%
Messr DeBari [Member] | Maximum [Member]
Commitments And Contingencies [Line Items]
Annual bonus opportunity percentage	60.00%
Scenario, Forecast [Member] | Bow Street LLC [Member]
Commitments And Contingencies [Line Items]
Payments for fees and expenses			$ 2,000,000

Commitments And Contingencies_7

Commitments And Contingencies (Future Minimum Rental Payments Of Ground Leases) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Commitments And Contingencies [Abstract]
Year one	$ 1,750	$ 1,750
Year two	1,750	1,750
Year three	1,756	1,750
Year four	1,776	1,756
Year five	1,742	1,776
2026 through 2098	152,980	154,722
Total lease payments	161,754	163,504
Less: imputed interest	(138,152)	(139,748)
Total	$ 23,602	$ 23,756

Tenant Leases (Future Minimum R

Tenant Leases (Future Minimum Rentals To Be Received Under Non-Cancelable Operating Leases) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Property Subject to or Available for Operating Lease [Line Items]
Year one	$ 117,228,000	$ 115,418,000
Year two	114,101,000	107,027,000
Year three	108,406,000	103,417,000
Year four	92,605,000	99,544,000
Year Five	88,309,000	88,082,000
Thereafter	462,920,000	488,305,000
Total	$ 983,569,000	$ 1,001,793,000
Tenant Leases [Member]
Property Subject to or Available for Operating Lease [Line Items]
Operating leases with various expiration dates through year	2041
Multi-Family Properties [Member]
Property Subject to or Available for Operating Lease [Line Items]
Lease period	1 year

Redeemable Noncontrolling Int_3

Redeemable Noncontrolling Interests (Narrative) (Details)

Jun. 30, 2019USD ($)

Jun. 28, 2019USD ($)

Jun. 26, 2019USD ($)property

Mar. 10, 2017USD ($)

Feb. 28, 2017USD ($)$ / sharesshares

Feb. 27, 2017USD ($)

Feb. 03, 2017USD ($)$ / sharesshares

Jun. 26, 2016USD ($)

Jun. 30, 2019

Mar. 31, 2019USD ($)

Dec. 31, 2020USD ($)$ / shares

Dec. 31, 2019USD ($)$ / shares

Dec. 31, 2018USD ($)$ / shares

Apr. 30, 2017shares

Redeemable Noncontrolling Interest [Line Items]

General and administrative

$ 73,641,000

$ 59,805,000

$ 53,869,000

Expiration period

10 years

Payment for borrowings

$ 516,000,000

617,000,000

494,000,000

Minimum [Member]

Redeemable Noncontrolling Interest [Line Items]

Percentage of interest in venture

20.00%

Maximum [Member]

Redeemable Noncontrolling Interest [Line Items]

Percentage of interest in venture

85.00%

Mack-Cali Realty LP [Member]

Redeemable Noncontrolling Interest [Line Items]

General and administrative

$ 73,641,000

$ 59,805,000

$ 53,869,000

Common unit distribution per unit declared | $ / shares

$ 0.40

$ 0.80

$ 0.80

Payment for borrowings

$ 516,000,000

$ 617,000,000

$ 494,000,000

Rockpoint [Member]

Redeemable Noncontrolling Interest [Line Items]

Estimated redemption value

476,000,000

Rockpoint [Member] | Cash Flow From Operations [Member]

Redeemable Noncontrolling Interest [Line Items]

Invested capital

400,000,000

Rockpoint [Member] | Cash Flow From Capital Events, Distribution Five [Member]

Redeemable Noncontrolling Interest [Line Items]

Invested capital

400,000,000

Rockpoint [Member] | Cash Flow From Capital Events, Distribution Six [Member]

Redeemable Noncontrolling Interest [Line Items]

Invested capital

$ 400,000,000

Rockpoint [Member] | Distribution One [Member]

Redeemable Noncontrolling Interest [Line Items]

Purchase price

$ 173,500,000

Purchase price, less distributions

198,500,000

Rockpoint [Member] | Distribution Two [Member]

Redeemable Noncontrolling Interest [Line Items]

Purchase price, less distributions

$ 1,500,000

Series A Units [Member] | Mack-Cali Realty LP [Member]

Redeemable Noncontrolling Interest [Line Items]

Preferred stock shares issued | shares

42,800

Preferred units shares issued | shares

42,800

Preferred unit annual rate

3.50%

Percentage of interest in venture

37.50%

Preferred unit in operating partnership

$ 1,000

Convertible preferred units | shares

28.15

Expiration period

5 years

Shares converted to common units | shares

1,204,820

Common unit distribution per unit declared | $ / shares

$ 35.52

Series A-1 Units [Member] | Mack-Cali Realty LP [Member]

Redeemable Noncontrolling Interest [Line Items]

Preferred stock shares issued | shares

9,213

Preferred units shares issued | shares

91

Preferred unit annual rate

3.50%

Percentage of interest in venture

13.80%

Preferred unit in operating partnership

$ 1,000

Convertible preferred units | shares

27.936

Expiration period

5 years

5 years

Shares converted to common units | shares

257,375

Common unit distribution per unit declared | $ / shares

$ 35.80

Preferred Units [Member] | Rockpoint [Member] | Cash Flow From Operations [Member]

Redeemable Noncontrolling Interest [Line Items]

Pro rata distribution

21.89%

Preferred Units [Member] | Rockpoint [Member] | Cash Flow From Capital Events, Distribution Five [Member]

Redeemable Noncontrolling Interest [Line Items]

Pro rata distribution

21.89%

Preferred Units [Member] | Rockpoint [Member] | Cash Flow From Capital Events, Distribution Six [Member]

Redeemable Noncontrolling Interest [Line Items]

Pro rata distribution

10.947%

Preferred Units [Member] | RRT [Member] | Cash Flow From Operations [Member]

Redeemable Noncontrolling Interest [Line Items]

Pro rata distribution

2.65%

Preferred Units [Member] | RRT [Member] | Cash Flow From Capital Events, Distribution Five [Member]

Redeemable Noncontrolling Interest [Line Items]

Pro rata distribution

2.65%

Preferred Units [Member] | RRT [Member] | Cash Flow From Capital Events, Distribution Six [Member]

Redeemable Noncontrolling Interest [Line Items]

Pro rata distribution

1.325%

Monaco (BLVD 495 N/S) [Member] | Series A-1 Units [Member] | Mack-Cali Realty LP [Member]

Redeemable Noncontrolling Interest [Line Items]

Preferred units shares issued | shares

9,122

Common Units [Member] | RRT [Member] | Cash Flow From Operations [Member]

Redeemable Noncontrolling Interest [Line Items]

Pro rata distribution

75.46%

Common Units [Member] | RRT [Member] | Cash Flow From Capital Events, Distribution Five [Member]

Redeemable Noncontrolling Interest [Line Items]

Pro rata distribution

75.46%

Common Units [Member] | RRT [Member] | Cash Flow From Capital Events, Distribution Six [Member]

Redeemable Noncontrolling Interest [Line Items]

Pro rata distribution

87.728%

Investment Agreement [Member] | Rockpoint [Member]

Redeemable Noncontrolling Interest [Line Items]

Contributed equity value

$ 1,230,000,000

Incremental closing payments, Limited Partnership interest

$ 46,000,000

$ 150,000,000

$ 46,000,000

$ 45,000,000

$ 105,000,000

Contributed amount to obtain equity units

300,000,000

Investment Agreement [Member] | Rockpoint [Member] | Maximum [Member]

Redeemable Noncontrolling Interest [Line Items]

Contributed amount to obtain equity units

$ 300,000,000

Contributed amount to obtain equity units

$ 300,000,000

$ 300,000,000

Add On Investment Agreement [Member] | Rockpoint [Member]

Redeemable Noncontrolling Interest [Line Items]

Contributed amount to obtain equity units

$ 100,000,000

Number of properties in which additional interest was acquired during period | property

2

Right of first refusal to invest

$ 100,000,000

General and administrative

$ 371,000

Payment for borrowings

100,000,000

Add On Investment Agreement [Member] | Rockpoint [Member] | Maximum [Member]

Redeemable Noncontrolling Interest [Line Items]

Contributed amount to obtain equity units

$ 154,000,000

RRLP [Member] | Cash Flow From Operations [Member]

Redeemable Noncontrolling Interest [Line Items]

Annual return on the equity value

6.00%

RRLP [Member] | Rockpoint [Member] | Cash Flow From Operations [Member]

Redeemable Noncontrolling Interest [Line Items]

Annual return

6.00%

Base return

4.64%

RRLP [Member] | Rockpoint [Member] | Cash Flow From Capital Events, Distribution Three [Member]

Redeemable Noncontrolling Interest [Line Items]

Base return

4.64%

RRLP [Member] | Rockpoint [Member] | Cash Flow From Capital Events, Distribution Four [Member]

Redeemable Noncontrolling Interest [Line Items]

Capital base return

4.64%

RRLP [Member] | Rockpoint [Member] | Cash Flow From Capital Events, Distribution Five [Member]

Redeemable Noncontrolling Interest [Line Items]

Internal rate of return

11.00%

RRLP [Member] | RRT [Member]

Redeemable Noncontrolling Interest [Line Items]

Loan-to-value ratio

65.00%

Equity capitalization percent

10.00%

RRLP [Member] | RRT [Member] | Cash Flow From Operations [Member]

Redeemable Noncontrolling Interest [Line Items]

Base return

95.36%

RRLP [Member] | RRT [Member] | Cash Flow From Capital Events, Distribution Three [Member]

Redeemable Noncontrolling Interest [Line Items]

Base return

95.36%

RRLP [Member] | RRT [Member] | Cash Flow From Capital Events, Distribution Four [Member]

Redeemable Noncontrolling Interest [Line Items]

Capital base return

95.36%

RRLP [Member] | RRT [Member] | Cash Flow From Capital Events, Distribution Six [Member]

Redeemable Noncontrolling Interest [Line Items]

Pro rata share

50.00%

RRLP [Member] | Investment Agreement [Member] | Rockpoint [Member] | Cash Flow From Operations [Member]

Redeemable Noncontrolling Interest [Line Items]

Base return

5.00%

RRLP [Member] | Investment Agreement [Member] | Rockpoint [Member] | Cash Flow From Capital Events, Distribution Three [Member]

Redeemable Noncontrolling Interest [Line Items]

Base return

5.00%

RRLP [Member] | Investment Agreement [Member] | Rockpoint [Member] | Cash Flow From Capital Events, Distribution Four [Member]

Redeemable Noncontrolling Interest [Line Items]

Capital base return

5.00%

RRLP [Member] | Investment Agreement [Member] | RRT [Member] | Cash Flow From Operations [Member]

Redeemable Noncontrolling Interest [Line Items]

Base return

95.00%

RRLP [Member] | Investment Agreement [Member] | RRT [Member] | Cash Flow From Capital Events, Distribution Three [Member]

Redeemable Noncontrolling Interest [Line Items]

Base return

95.00%

RRLP [Member] | Investment Agreement [Member] | RRT [Member] | Cash Flow From Capital Events, Distribution Four [Member]

Redeemable Noncontrolling Interest [Line Items]

Capital base return

95.00%

RRLP [Member] | Credit Enhancement Note [Member]

Redeemable Noncontrolling Interest [Line Items]

Maximum borrowing capacity

$ 50,000,000

Increased line of credit

$ 25,000,000

Spread over LIBOR

0.50%

Redeemable Noncontrolling Int_4

Redeemable Noncontrolling Interests (Schedule Of Changes In The Value Of The Redeemable Noncontrolling Interests) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Redeemable Noncontrolling Interest [Line Items]
Balance	$ 503,382,000
Income Attributed to Noncontrolling Interests	(25,883,000)	$ (22,615,000)	$ (13,979,000)
Redemption Value Adjustment	(38,951,000)	(51,355,000)	(26,700,000)
Redeemable noncontrolling interests	513,297,000	503,382,000
Redeemable Noncontrolling Interests [Member]
Redeemable Noncontrolling Interest [Line Items]
Balance	503,382,000	330,459,000
Redeemable Noncontrolling Interests Issued (net of issuance)		143,450,000
Net	503,382,000	473,909,000
Income Attributed to Noncontrolling Interests	25,883,000	22,615,000
Distributions	(25,883,000)	(22,615,000)
Other Distributions	(3,153,000)
Redemption Value Adjustment	13,068,000	29,473,000
Redeemable noncontrolling interests	513,297,000	503,382,000	330,459,000
Issuance Costs		1,500,000
Redeemable Noncontrolling Interests [Member] | Series A And Series A-1 Preferred Units In MCRLP [Member]
Redeemable Noncontrolling Interest [Line Items]
Balance	52,324,000	52,324,000
Net	52,324,000	52,324,000
Income Attributed to Noncontrolling Interests	1,820,000	1,820,000
Distributions	(1,820,000)	(1,820,000)
Redeemable noncontrolling interests	52,324,000	52,324,000	52,324,000
Redeemable Noncontrolling Interests [Member] | Rockpoint [Member]
Redeemable Noncontrolling Interest [Line Items]
Balance	451,058,000	278,135,000
Redeemable Noncontrolling Interests Issued (net of issuance)		143,450,000
Net	451,058,000	421,585,000
Income Attributed to Noncontrolling Interests	24,063,000	20,795,000
Distributions	(24,063,000)	(20,795,000)
Other Distributions	(3,153,000)
Redemption Value Adjustment	13,068,000	29,473,000
Redeemable noncontrolling interests	$ 460,973,000	$ 451,058,000	$ 278,135,000

Mack-Cali Realty Corporation _3

Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Share/Unit Repurchase Program And Dividend Reinvestment And Stock Purchase Plan) (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2012
Stockholders Equity [Line Items]
Date share repurchase program was initiated	September 2012
Capacity of share repurchase program	$ 150,000,000
Shares purchased and retired	394,625
Aggregate cost of stock repurchased	$ 11,000,000
Capacity available for additional repurchase of outstanding common stock	$ 139,000,000
Proceeds from sale of common units		$ 11,000,000
Dividend Reinvestment And Stock Purchase Plan [Member]
Stockholders Equity [Line Items]
Common stock reserved for future issuance	5,500,000
Monthly cash investment without restriction, maximum	$ 5,000

Mack-Cali Realty Corporation _4

Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Stock Option Plans) (Narrative) (Details)	Jun. 05, 2015item$ / sharesshares	Dec. 31, 2020USD ($)$ / sharesshares	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	May 31, 2013shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average remaining contractual life		3 years 7 months 6 days	5 years 4 months 24 days
Share price | $ / shares	$ 17.31
Proceeds from stock options exercised | $		$ 0	$ 0	$ 0
Stock options expense | $		$ 446,000	$ 0	$ 193,000
Shares Under Options - Granted	800,000
Common stock trade share price | $ / shares	$ 25
Annual installments | item	3
Exercisable period		10 years
Common stock trading days		30 days
Share price - weighted average fair value of options granted | $ / shares		$ 2.95
Three Equal Annual Installment [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Under Options - Granted	400,000
Common Stock Trades [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Under Options - Granted	400,000
2013 Incentive Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved stocks for issuance					4,600,000
MAG Partners [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Under Options - Granted		157,505
MAG Partners [Member] | Maximum [Member] | Common Class At $14.39 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized		230,000
Share price issued | $ / shares		$ 14.39
MAG Partners [Member] | Maximum [Member] | Common Class At $20.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized		100,000
Share price issued | $ / shares		$ 20

Mack-Cali Realty Corporation _5

Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (AO LTIP Units (Appreciation-Only LTIP Units)) (Narrative) (Details) - USD ($)	Jun. 05, 2015	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	800,000
Share price	$ 17.31
Exercisable period		10 years
Common stock trading days		30 days
Common stock trade share price	$ 25
Share price - weighted average fair value of options granted		$ 2.95
Stock options expense		$ 446,000	$ 0	$ 193,000
AO LTIP Units Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share price		$ 21.46
Exercisable period		10 years
Share price - weighted average fair value of options granted			$ 3.98
Total unrecognized compensation cost		$ 1,400,000
Total unrecognized compensation cost, period of recognition		2 years 2 months 12 days
Stock options expense		$ 622,000	$ 498,000	$ 0
AO LTIP Units Award [Member] | Messr DeMarco, CEO [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		625,000	625,000
Income allocation		10.00%
Percent of cash distribution		10.00%
AO LTIP Units Award [Member] | Messr DeMarco, CEO [Member] | Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares to be vested and exercisable		250,000
Common stock trading days		30 days
Common stock trade share price		$ 25
Common stock expiration date		Mar. 13, 2023
AO LTIP Units Award [Member] | Messr DeMarco, CEO [Member] | Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares to be vested and exercisable		250,000
Common stock trading days		30 days
Common stock trade share price		$ 28
AO LTIP Units Award [Member] | Messr DeMarco, CEO [Member] | Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares to be vested and exercisable		125,000
Common stock trading days		30 days
Common stock trade share price		$ 31

Mack-Cali Realty Corporation _6

Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Restricted Stock Awards) (Narrative) (Details) - USD ($) $ in Millions	Jun. 05, 2015	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested stock outstanding		52,974	42,690	67,289	108,318
Shares granted		52,974	42,690	40,185
Performance period		3 years
Restricted Stock [Member] | 2013 Incentive Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		3 years
Shares granted	37,550.54
Restricted Stock [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		1 year
Restricted Stock [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		7 years
Unvested Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested stock outstanding		52,974	42,690	67,289
Total Stockholder Return Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost		$ 0.4
Total unrecognized compensation cost, period of recognition		6 months

Mack-Cali Realty Corporation _7

Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Long-Term Incentive Plan Awards) (Narrative) (Details) - USD ($) $ in Millions	Mar. 22, 2019	Apr. 20, 2018	Apr. 04, 2017	Mar. 08, 2016	Jun. 05, 2015	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period						3 years
Shares granted					800,000
2016 LTIP Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends paid, percent representing common unit of limited partnership interest						10.00%
Dividends paid, percent payable upon vesting of LTIP Unit						90.00%
Total unrecognized compensation cost						$ 8
Total unrecognized compensation cost, period of recognition						2 years 3 months 18 days
2016 TBV LTIP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted						68,205
2016 OPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period						3 years
TSR percent						50.00%
2016 OPP [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period						3 years
2016 PBV LTIP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted						3,718
2017 LTIP Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares forfeited and cancelled						369,924
2017 OPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period						3 years
TSR percent						36.00%
2017 PBV LTIP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted						10,264
2017 TBV LTIP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted						70,772
2018 LTIP Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares forfeited and cancelled						102,639
2018 OPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period						3 years
TSR percent						36.00%
2018 PBV LTIP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted						542,651
2018 TBV LTIP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted						177,179
2019 LTIP Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares forfeited and cancelled						175,570
2019 TBV LTIP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted						140,995
2019 PBV LTIP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted						249,058
2019 OPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period						3 years
TSR percent						36.00%
2020 OPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period						3 years
TSR percent						36.00%
2020 PBV LTIP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted						720,314
2020 LTIP Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period						3 years
Shares forfeited and cancelled						567,254
Other Executive Officers [Member] | 2016 LTIP Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of the award				40.00%
Remaining percent of the award				60.00%
Other Executive Officers [Member] | 2017 LTIP Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of the award			40.00%
Remaining percent of the award			60.00%
Other Executive Officers [Member] | 2018 LTIP Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of the award		50.00%
Remaining percent of the award		50.00%
Messieur Rudin, Messieur DeMarco, And Messieur Tycher [Member] | 2016 LTIP Awards [Member] | Time-Based Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of the award				25.00%
Performance period						3 years
Messieur Rudin, Messieur DeMarco, And Messieur Tycher [Member] | 2016 LTIP Awards [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining percent of the award				75.00%
Messieur Rudin, Messieur DeMarco, And Messieur Tycher [Member] | 2017 LTIP Awards [Member] | Time-Based Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of the award			25.00%
Messieur Rudin, Messieur DeMarco, And Messieur Tycher [Member] | 2017 LTIP Awards [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining percent of the award			75.00%
Messieur Rudin, Messieur DeMarco, And Messieur Tycher [Member] | 2017 TBV LTIP Units [Member] | Time-Based Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period						3 years
Messieur DeMarco And Messieur Tycher [Member] | 2018 LTIP Awards [Member] | Time-Based Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of the award		25.00%
Performance period						3 years
Messieur DeMarco And Messieur Tycher [Member] | 2018 LTIP Awards [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining percent of the award		75.00%
Messr DeMarco, CEO [Member] | 2019 LTIP Awards [Member] | Time-Based Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of the award	25.00%
Messr DeMarco, CEO [Member] | 2019 LTIP Awards [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining percent of the award	75.00%
Messieur Tycher, Smetana, Wagner, Cardoso, And Hilton [Member] | 2019 TBV LTIP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of the award						50.00%
Messieur Tycher, Smetana, Wagner, Cardoso, And Hilton [Member] | 2019 PBV LTIP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining percent of the award						50.00%
Messr DeBari [Member] | 2019 LTIP Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of the award						100.00%

Mack-Cali Realty Corporation _8

Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Deferred Stock Compensation Plan For Directors) (Narrative) (Details) - shares	Jun. 12, 2020	Jun. 12, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital [Abstract]
Maximum percentage of retainer fee that directors may defer			100.00%
Deferred stock units earned			22,086	14,337	26,620
Deferred stock units converted	61,277	193,949
Deferred stock units outstanding			17,854	59,899

Mack-Cali Realty Corporation _9

Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Earnings Per Share/Unit) (Narrative) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested stock outstanding	52,974	42,690	67,289	108,318
Dividends declared per common share	$ 0.40	$ 0.80	$ 0.80
Mack-Cali Realty LP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Distribution declared per common unit	$ 0.40	$ 0.80	$ 0.80
Unvested Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested stock outstanding	52,974	42,690	67,289
Unvested Restricted Stock [Member] | Mack-Cali Realty LP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested stock outstanding	52,974	42,690	67,289
Unvested LTIP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested stock outstanding	1,722,929	1,826,331	1,707,106
Unvested LTIP Units [Member] | Mack-Cali Realty LP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested stock outstanding	1,722,929	1,826,331	1,707,106
Unvested AO LTIP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested stock outstanding	625,000	625,000
Unvested AO LTIP Units [Member] | Mack-Cali Realty LP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested stock outstanding	625,000	625,000

Mack-Cali Realty Corporation_10

Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Schedule Of Stock Option Plans) (Details) - USD ($) $ / shares in Units, $ in Thousands	Jun. 05, 2015	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Shares Under Options - Granted	800,000
2013 Incentive Stock Plan [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Shares Under Options - Outstanding, beginning balance		800,000	800,000	800,000
Shares Under Options - Granted, Lapsed or Cancelled		172,495
Shares Under Options - Outstanding, ending balance		972,495	800,000	800,000	800,000
Shares Under Options - Options exercisable		972,495
Shares Under Options - Available for grant		717,155
Weighted Average Exercise Price - Outstanding, beginning balance		$ 17.31	$ 17.31	$ 17.31
Weighted Average Exercise Price - Granted, Lapsed or Cancelled		14.39
Weighted Average Exercise Price - Outstanding, ending balance		16.79	$ 17.31	$ 17.31	$ 17.31
Aggregate intrinsic value			$ 4,656	$ 1,824	$ 3,400
Outstanding stock option price			$ 17.31	$ 17.31	$ 17.31
Minimum [Member] | 2013 Incentive Stock Plan [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Outstanding stock option price		14.39
Maximum [Member] | 2013 Incentive Stock Plan [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Outstanding stock option price		$ 17.31

Mack-Cali Realty Corporation_11

Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Schedule Of Weighted Average Assumptions) (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
AO LTIP Units Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate		2.60%
Volatility		29.00%
Dividend yield		3.50%
Minimum [Member] | AO LTIP Units Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (in years)		5 years 6 months
Maximum [Member] | AO LTIP Units Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (in years)		6 years
2013 Incentive Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (in years)	5 years 3 months 18 days
Risk-free interest rate	0.41%
Volatility	31.00%
Dividend yield	2.70%

Mack-Cali Realty Corporation_12

Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Schedule Of Restricted Stock Awards) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital [Abstract]
Shares, Outstanding, Beginning balance	42,690	67,289	108,318
Shares, Granted	52,974	42,690	40,185
Shares, Vested	(42,690)	(65,353)	(72,502)
Shares, Forfeited		(1,936)	(8,712)
Shares, Outstanding, Ending balance	52,974	42,690	67,289
Weighted-Average Grant-Date Fair Value, Outstanding beginning balance	$ 21.08	$ 22.43	$ 25.49
Weighted-Average Grant-Date Fair Value, Granted	15.29	21.08	20.16
Weighted-Average Grant-Date Fair Value, Vested	21.08	22.34	25.33
Weighted-Average Grant-Date Fair Value, Forfeited		25.83	25.83
Weighted-Average Grant-Date Fair Value, Outstanding ending balance	$ 15.29	$ 21.08	$ 22.43

Mack-Cali Realty Corporation_13

Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Earnings Per Share Tables - Basic Computation Of EPS) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stockholders Equity [Line Items]
Income (loss) from continuing operations									$ (115,523)	$ 252,820	$ 82,824
Add (deduct): Noncontrolling interests in consolidated joint ventures									2,695	3,904	1,216
Add (deduct): Noncontrolling interests in Operating Partnership									13,279	(23,720)	(7,127)
Add (deduct): Redeemable noncontrolling interests									(25,883)	(22,615)	(13,979)
Add (deduct): Redeemable noncontrolling interest									(25,883)	(22,615)	(13,979)
Add (deduct): Redemption value adjustment of redeemable noncontrolling interests attributable to common shareholders									(11,814)	(25,885)	(11,425)
Income (loss) from continuing operations available to common shareholders									(137,246)	184,504	51,509
Income (loss) from discontinued operations available to common shareholders									74,045	(98,528)	21,177
Net income (loss) available to common shareholders for basic earnings per share									$ (63,201)	$ 85,976	$ 72,686
Weighted average common shares									90,648	90,557	90,388
Income (loss) from continuing operations available to common shareholders	$ 0.22	$ (0.83)	$ (0.50)	$ (0.40)	$ 0.51	$ (0.63)	$ (0.44)	$ 2.59	$ (1.51)	$ 2.04	$ 0.57
Income (loss) from discontinued operations available to common shareholders	0.45	0.34	0.09	(0.07)	(1.15)	(0.02)	0.01	0.08	0.81	(1.09)	0.23
Net income (loss) available to common shareholders	0.67	(0.49)	(0.41)	(0.47)	(0.64)	(0.65)	(0.43)	2.67	$ (0.70)	$ 0.95	$ 0.80
Mack-Cali Realty LP [Member]
Stockholders Equity [Line Items]
Income (loss) from continuing operations									$ (115,523)	$ 252,820	$ 82,824
Add (deduct): Noncontrolling interests in consolidated joint ventures									2,695	3,904	1,216
Add (deduct): Redeemable noncontrolling interests									(25,883)	(22,615)	(13,979)
Add (deduct): Redemption value adjustment of redeemable noncontrolling interests attributable to common shareholders									(13,068)	(28,740)	(12,721)
Income (loss) from continuing operations available to common shareholders									(151,779)	205,369	57,340
Income (loss) from discontinued operations available to common shareholders									81,925	(108,984)	23,577
Net income (loss) available to common shareholders for basic earnings per share									$ (69,854)	$ 96,385	$ 80,917
Weighted average common units									100,260	100,520	100,634
Income (loss) from continuing operations available to common shareholders	0.22	(0.83)	(0.50)	(0.40)	0.51	(0.63)	(0.44)	2.59	$ (1.51)	$ 2.04	$ 0.57
Income (loss) from discontinued operations available to common shareholders	0.45	0.34	0.09	(0.07)	(1.15)	(0.02)	0.01	0.08	0.81	(1.09)	0.23
Net income (loss) available to common shareholders	$ 0.67	$ (0.49)	$ (0.41)	$ (0.47)	$ (0.64)	$ (0.65)	$ (0.43)	$ 2.67	$ (0.70)	$ 0.95	$ 0.80

Mack-Cali Realty Corporation_14

Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Earnings Per Share Tables - Diluted Computation Of EPS) (Details) - USD ($) $ / shares in Units, shares in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stockholders Equity [Line Items]
Net income (loss) from continuing operations available to common shareholders									$ (137,246,000)	$ 184,504,000	$ 51,509,000
Add (deduct): Noncontrolling interests in Operating Partnership									(13,279,000)	23,720,000	7,127,000
Add (deduct): Redemption value adjustment of redeemable noncontrolling interests in Operating Partnership unitholders									(1,254,000)	(2,855,000)	(1,296,000)
Income (loss) from continuing operations for diluted earnings per share									(151,779,000)	205,369,000	57,340,000
Income (loss) from discontinued operations for diluted earnings per share									81,925,000	(108,984,000)	23,577,000
Net income (loss) available for diluted earnings per share									$ (69,854,000)	$ 96,385,000	$ 80,917,000
Weighted average common shares									100,260	100,689	100,724
Income (loss) from continuing operations available to common shareholders	$ 0.22	$ (0.83)	$ (0.50)	$ (0.40)	$ 0.51	$ (0.63)	$ (0.44)	$ 2.58	$ (1.51)	$ 2.04	$ 0.57
Income (loss) from discontinued operations available to common shareholders	0.45	0.34	0.09	(0.07)	(1.15)	(0.02)	0.01	0.08	0.81	(1.09)	0.23
Net income (loss) available to common shareholders	0.67	(0.49)	(0.41)	(0.47)	(0.64)	(0.65)	(0.43)	2.66	$ (0.70)	$ 0.95	$ 0.80
Mack-Cali Realty LP [Member]
Stockholders Equity [Line Items]
Income (loss) from continuing operations for diluted earnings per share									$ (151,779,000)	$ 205,369,000	$ 57,340,000
Income (loss) from discontinued operations for diluted earnings per share									81,925,000	(108,984,000)	23,577,000
Net income (loss) available for diluted earnings per share									$ (69,854,000)	$ 96,385,000	$ 80,917,000
Weighted average common unit									100,260	100,689	100,724
Income (loss) from continuing operations available to common shareholders	0.22	(0.83)	(0.50)	(0.40)	0.51	(0.63)	(0.44)	2.58	$ (1.51)	$ 2.04	$ 0.57
Income (loss) from discontinued operations available to common shareholders	0.45	0.34	0.09	(0.07)	(1.15)	(0.02)	0.01	0.08	0.81	(1.09)	0.23
Net income (loss) available to common shareholders	$ 0.67	$ (0.49)	$ (0.41)	$ (0.47)	$ (0.64)	$ (0.65)	$ (0.43)	$ 2.66	$ (0.70)	$ 0.95	$ 0.80

Mack-Cali Realty Corporation_15

Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Schedule Of Reconciliation Of Shares Used In Basic EPS Calculation To Shares Used In Diluted EPS Calculation) (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stockholders Equity [Line Items]
Basic EPS shares	90,648	90,557	90,388
Add: Operating Partnership - common and vested LTIP units	9,612	9,963	10,246
Stock Options		169	90
Diluted EPS Shares	100,260	100,689	100,724
Mack-Cali Realty LP [Member]
Stockholders Equity [Line Items]
Basic EPU units	100,260	100,520	100,634
Stock Options		169	90
Diluted EPU Units	100,260	100,689	100,724

Noncontrolling Interests In S_3

Noncontrolling Interests In Subsidiaries (Narrative) (Details) $ in Millions	Jun. 05, 2015shares	Dec. 31, 2020USD ($)propertyshares	Dec. 31, 2019shares
Noncontrolling Interest [Line Items]
Number of common shares received upon redemption of common units		1
Rebalance of ownership percentage | $		$ 2.6
Shares granted	800,000
Exercisable period		10 years
Participation Rights [Member]
Noncontrolling Interest [Line Items]
Number of properties | property		1
Excess net cash flow remaining after the distribution to the Company		50.00%
Internal rate of return		10.00%
Mack-Cali Realty LP [Member]
Noncontrolling Interest [Line Items]
Percentage of noncontrolling interest		9.60%	9.60%
Future Developments [Member] | Participation Rights [Member]
Noncontrolling Interest [Line Items]
Number of properties | property		1
Disposal Group, Not Discontinued Operations [Member] | Flex Portfolio [Member]
Noncontrolling Interest [Line Items]
Redemption of common units, shares		138,615
Value of units redeemed | $		$ 2.7
AO LTIP Units Award [Member]
Noncontrolling Interest [Line Items]
Exercisable period		10 years
AO LTIP Units Award [Member] | Messr DeMarco, CEO [Member]
Noncontrolling Interest [Line Items]
Shares granted		625,000	625,000

Noncontrolling Interests In S_4

Noncontrolling Interests In Subsidiaries (Changes In Noncontrolling Interests Of Subsidiaries) (Details) - Mack-Cali Realty LP [Member] - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Balance, Beginning, Common Units/Vested LTIP Units	9,612,064	10,229,349	10,438,855
Redemption of common units for shares of common stock		(38,011)	(264,570)
Redemption of common units	(138,615)	(665,918)
Conversion of vested LTIP units to common units	38,626	18,438
Vested LTIP units	136,957	68,206	55,064
Cancellation of units	(1)
Balance, Ending, Common Units/Vested LTIP Units	9,649,031	9,612,064	10,229,349
Balance, Beginning, Unvested LTIP Units	1,826,331	1,707,106	1,230,877
Vested LTIP units	(175,583)	(86,644)	(55,064)
Issuance of units, LTIP Units	1,287,568	565,623	864,024
Cancellation of units	(1,215,387)	(359,754)	(332,731)
Balance, Ending, Unvested LTIP Units	1,722,929	1,826,331	1,707,106

Segment Reporting (Narrative) (

Segment Reporting (Narrative) (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2020USD ($)	Sep. 30, 2020USD ($)	Jun. 30, 2020USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Sep. 30, 2019USD ($)	Jun. 30, 2019USD ($)	Mar. 31, 2019USD ($)	Dec. 31, 2020USD ($)segment	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Segment Reporting Information [Line Items]
Number of business segments | segment									2
Total revenues	$ 76,564,000	$ 79,197,000	$ 74,197,000	$ 83,604,000	$ 88,227,000	$ 89,038,000	$ 88,138,000	$ 91,799,000	$ 313,562,000	$ 357,202,000	$ 371,724,000
Foreign Locations [Member]
Segment Reporting Information [Line Items]
Total revenues									0	0	$ 0
Long lived assets	$ 0				$ 0				$ 0	$ 0

Segment Reporting (Schedule Of

Segment Reporting (Schedule Of Selected Results Of Operations And Asset Information) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total revenues	$ 76,564,000	$ 79,197,000	$ 74,197,000	$ 83,604,000	$ 88,227,000	$ 89,038,000	$ 88,138,000	$ 91,799,000	$ 313,562,000	$ 357,202,000	$ 371,724,000
Total operating and interest expenses									295,999,000	296,987,000	285,988,000
Equity in earnings (loss) of unconsolidated joint ventures									(3,832,000)	(1,319,000)	(127,000)
Net operating income (loss)									13,731,000	58,896,000	85,609,000
Total assets	5,147,786,000				5,292,798,000				5,147,786,000	5,292,798,000
Total long-lived assets	4,727,128,000				4,763,193,000				4,727,128,000	4,763,193,000
Total investments in unconsolidated joint ventures	162,382,000				209,091,000				162,382,000	209,091,000
Commercial And Other Real Estate [Member]
Segment Reporting Information [Line Items]
Total revenues									155,045,000	184,966,000	257,487,000
Total operating and interest expenses									73,184,000	80,050,000	116,912,000
Equity in earnings (loss) of unconsolidated joint ventures									(2,254,000)	(1,194,000)	2,319,000
Net operating income (loss)									79,607,000	103,722,000	142,894,000
Total assets	1,881,161,000				2,178,321,000				1,881,161,000	2,178,321,000
Total long-lived assets	1,693,054,000				1,947,053,000				1,693,054,000	1,947,053,000
Total investments in unconsolidated joint ventures	5,555,000				7,367,000				5,555,000	7,367,000
Multiple-Family Real Estate & Services [Member]
Segment Reporting Information [Line Items]
Total revenues									156,841,000	170,833,000	113,805,000
Total operating and interest expenses									95,631,000	89,512,000	70,279,000
Equity in earnings (loss) of unconsolidated joint ventures									(1,578,000)	(125,000)	(2,446,000)
Net operating income (loss)									59,632,000	81,196,000	41,080,000
Total assets	3,249,516,000				3,079,409,000				3,249,516,000	3,079,409,000
Total long-lived assets	3,035,485,000				2,812,306,000				3,035,485,000	2,812,306,000
Total investments in unconsolidated joint ventures	156,827,000				201,724,000				156,827,000	201,724,000
Corporate & Other [Member]
Segment Reporting Information [Line Items]
Total revenues									1,676,000	1,403,000	432,000
Total operating and interest expenses									127,184,000	127,425,000	98,797,000
Net operating income (loss)									(125,508,000)	(126,022,000)	$ (98,365,000)
Total assets	17,109,000				35,068,000				17,109,000	35,068,000
Total long-lived assets	$ (1,411,000)				$ 3,834,000				$ (1,411,000)	$ 3,834,000

Segment Reporting (Schedule O_2

Segment Reporting (Schedule Of Reconciliation Of Net Operating Income To Net Income Available To Common Shareholders) (Details) - USD ($)	3 Months Ended								9 Months Ended	12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net operating income										$ 13,731,000	$ 58,896,000	$ 85,609,000
Depreciation and amortization										(122,035,000)	(133,597,000)	(113,817,000)
Land and other impairments										(16,817,000)	(32,444,000)	(24,566,000)
Property impairments									$ (36,600,000)	(36,582,000)
Gain on change of control of interests											13,790,000	14,217,000
Realized gains (losses) and unrealized losses on disposition of rental property, net										5,481,000	343,102,000	99,436,000
Gain on disposition of developable land										5,787,000	522,000	30,939,000
Gain on sale from unconsolidated joint ventures										35,184,000	903,000
Gain (loss) from extinguishment of debt, net										(272,000)	1,648,000	(8,994,000)
Income (loss) from continuing operations										(115,523,000)	252,820,000	82,824,000
Income from discontinued operations										70,724,000	24,366,000	23,577,000
Loss from early extinguishment of debt												(1,757,000)
Realized gains (losses) and unrealized losses on disposition of rental property and impairments, net										11,201,000	(133,350,000)
Total discontinued operations, net										81,925,000	(108,984,000)	23,577,000
Net income (loss)	$ 78,298,000	$ (41,118,000)	$ (32,934,000)	$ (37,844,000)	$ (55,408,000)	$ (56,021,000)	$ (20,329,000)	$ 275,594,000		(33,598,000)	143,836,000	106,401,000
Noncontrolling interests in consolidated joint ventures										2,695,000	3,904,000	1,216,000
Noncontrolling interests in Operating Partnership of income from continuing operations										13,279,000	(23,720,000)	(7,127,000)
Noncontrolling interests in Operating Partnership in discontinued operations										(7,880,000)	10,456,000	(2,400,000)
Redeemable noncontrolling interests										(25,883,000)	(22,615,000)	(13,979,000)
Net income (loss) available to common shareholders	65,632,000	(42,208,000)	(34,887,000)	(39,924,000)	(54,652,000)	(55,928,000)	(22,054,000)	244,495,000		(51,387,000)	111,861,000	84,111,000
Mack-Cali Realty LP [Member]
Segment Reporting Information [Line Items]
Net operating income										13,731,000	58,896,000	85,609,000
Depreciation and amortization										(122,035,000)	(133,597,000)	(113,817,000)
Land and other impairments										(16,817,000)	(32,444,000)	(24,566,000)
Property impairments										(36,582,000)
Gain on change of control of interests											13,790,000	14,217,000
Realized gains (losses) and unrealized losses on disposition of rental property, net										5,481,000	343,102,000	99,436,000
Gain on disposition of developable land										5,787,000	522,000	30,939,000
Gain on sale from unconsolidated joint ventures										35,184,000	903,000
Gain (loss) from extinguishment of debt, net										(272,000)	1,648,000	(8,994,000)
Income (loss) from continuing operations										(115,523,000)	252,820,000	82,824,000
Income from discontinued operations										70,724,000	24,366,000	23,577,000
Realized gains (losses) and unrealized losses on disposition of rental property and impairments, net										11,201,000	(133,350,000)
Total discontinued operations, net										81,925,000	(108,984,000)	23,577,000
Net income (loss)	78,298,000	(41,118,000)	(32,934,000)	(37,844,000)	(55,408,000)	(56,021,000)	(20,329,000)	275,594,000		(33,598,000)	143,836,000	106,401,000
Noncontrolling interests in consolidated joint ventures										2,695,000	3,904,000	1,216,000
Redeemable noncontrolling interests										(25,883,000)	(22,615,000)	(13,979,000)
Net income (loss) available to common shareholders	$ 72,623,000	$ (46,694,000)	$ (38,576,000)	$ (44,139,000)	$ (60,475,000)	$ (62,087,000)	$ (24,488,000)	$ 272,175,000		$ (56,786,000)	$ 125,125,000	$ 93,638,000

Related Party Transactions (Nar

Related Party Transactions (Narrative) (Details)	1 Months Ended				12 Months Ended
	Apr. 30, 2021USD ($)	Jan. 31, 2021USD ($)	Nov. 30, 2020USD ($)	Sep. 30, 2020USD ($)item	Dec. 31, 2020USD ($)ft²propertyitem	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Related Party Transaction [Line Items]
Revenue from leases					$ 272,970,000	$ 302,409,000	$ 323,793,000
Reimbursement expense				$ 6,100,000
General and administrative					73,641,000	59,805,000	53,869,000
Number of payments | item				3
Mack [Member]
Related Party Transaction [Line Items]
Due from related parties					0	0
Marshall [Member]
Related Party Transaction [Line Items]
Due from related parties					99,000
Due to related party, Current						120,000	148,000
Accounts payable to related parties					0	0
RG [Member]
Related Party Transaction [Line Items]
Related party revenue					0	674,000	1,114,000
Bow Street LLC [Member]
Related Party Transaction [Line Items]
Reimbursement expense				$ 6,100,000
General and administrative				$ 6,100,000	$ 6,100,000
Number of payments | item					3
Payments for fees and expenses			$ 2,100,000
Leased Office Space 1 [Member] | Mack [Member]
Related Party Transaction [Line Items]
Area Of Real Estate Property | ft²					5,930
Number of real estate properties | property					1
Lease expiration date					January 2025
Previously Leased [Member]
Related Party Transaction [Line Items]
Number of real estate properties | property					1
Previously Leased [Member] | Mack [Member]
Related Party Transaction [Line Items]
Area Of Real Estate Property | ft²					7,034
Revenue from leases					$ 48,000	$ 18,000	$ 193,000
Scenario, Forecast [Member] | Bow Street LLC [Member]
Related Party Transaction [Line Items]
Payments for fees and expenses	$ 2,000,000
Subsequent Event [Member] | Bow Street LLC [Member]
Related Party Transaction [Line Items]
Payments for fees and expenses		$ 2,000,000

Condensed Quarterly Financial_3

Condensed Quarterly Financial Information (Summary Of Condensed Quarterly Financial Information) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Total revenues	$ 76,564,000	$ 79,197,000	$ 74,197,000	$ 83,604,000	$ 88,227,000	$ 89,038,000	$ 88,138,000	$ 91,799,000	$ 313,562,000	$ 357,202,000	$ 371,724,000
Net income (loss)	78,298,000	(41,118,000)	(32,934,000)	(37,844,000)	(55,408,000)	(56,021,000)	(20,329,000)	275,594,000	(33,598,000)	143,836,000	106,401,000
Net income (loss) available to common shareholders	$ 65,632,000	$ (42,208,000)	$ (34,887,000)	$ (39,924,000)	$ (54,652,000)	$ (55,928,000)	$ (22,054,000)	$ 244,495,000	$ (51,387,000)	$ 111,861,000	$ 84,111,000
Basic earnings per common share:
Income from continuing operations	$ 0.22	$ (0.83)	$ (0.50)	$ (0.40)	$ 0.51	$ (0.63)	$ (0.44)	$ 2.59	$ (1.51)	$ 2.04	$ 0.57
Discontinued operations	0.45	0.34	0.09	(0.07)	(1.15)	(0.02)	0.01	0.08	0.81	(1.09)	0.23
Net income (loss) available to common shareholders	0.67	(0.49)	(0.41)	(0.47)	(0.64)	(0.65)	(0.43)	2.67	(0.70)	0.95	0.80
Diluted earnings per common share:
Income from continuing operations	0.22	(0.83)	(0.50)	(0.40)	0.51	(0.63)	(0.44)	2.58	(1.51)	2.04	0.57
Discontinued operations	0.45	0.34	0.09	(0.07)	(1.15)	(0.02)	0.01	0.08	0.81	(1.09)	0.23
Net income (loss) available to common shareholders	$ 0.67	$ (0.49)	$ (0.41)	$ (0.47)	$ (0.64)	$ (0.65)	$ (0.43)	$ 2.66	$ (0.70)	$ 0.95	$ 0.80
Mack-Cali Realty LP [Member]
Total revenues	$ 76,564,000	$ 79,197,000	$ 74,197,000	$ 83,604,000	$ 88,227,000	$ 89,038,000	$ 88,138,000	$ 91,799,000	$ 313,562,000	$ 357,202,000	$ 371,724,000
Net income (loss)	78,298,000	(41,118,000)	(32,934,000)	(37,844,000)	(55,408,000)	(56,021,000)	(20,329,000)	275,594,000	(33,598,000)	143,836,000	106,401,000
Net income (loss) available to common shareholders	$ 72,623,000	$ (46,694,000)	$ (38,576,000)	$ (44,139,000)	$ (60,475,000)	$ (62,087,000)	$ (24,488,000)	$ 272,175,000	$ (56,786,000)	$ 125,125,000	$ 93,638,000
Basic earnings per common share:
Income from continuing operations	$ 0.22	$ (0.83)	$ (0.50)	$ (0.40)	$ 0.51	$ (0.63)	$ (0.44)	$ 2.59	$ (1.51)	$ 2.04	$ 0.57
Discontinued operations	0.45	0.34	0.09	(0.07)	(1.15)	(0.02)	0.01	0.08	0.81	(1.09)	0.23
Net income (loss) available to common shareholders	0.67	(0.49)	(0.41)	(0.47)	(0.64)	(0.65)	(0.43)	2.67	(0.70)	0.95	0.80
Diluted earnings per common share:
Income from continuing operations	0.22	(0.83)	(0.50)	(0.40)	0.51	(0.63)	(0.44)	2.58	(1.51)	2.04	0.57
Discontinued operations	0.45	0.34	0.09	(0.07)	(1.15)	(0.02)	0.01	0.08	0.81	(1.09)	0.23
Net income (loss) available to common shareholders	$ 0.67	$ (0.49)	$ (0.41)	$ (0.47)	$ (0.64)	$ (0.65)	$ (0.43)	$ 2.66	$ (0.70)	$ 0.95	$ 0.80

Real Estate Investments And A_2

Real Estate Investments And Accumulated Depreciation (Schedule Of Real Estate Investments And Accumulated Depreciation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Related Encumbrances	$ 2,204,144
Initial Costs, Land	815,166
Initial Costs, Building and Improvements	3,728,392
Costs Capitalized Subsequent to Acquisition	1,037,158
Gross Amount at Which Carried at Close of Period, Land	803,847
Gross Amount at Which Carried at Close of Period, Building and Improvements	4,776,868
Total	4,638,643	$ 4,256,681	$ 5,306,017	$ 5,102,844
Accumulated Depreciation	656,331	$ 558,617	$ 1,097,868	$ 1,087,083
Real Estate Aggregate Cost, Tax Purpose	4,000,000
Real Estate Held-for-sale Accumulated Depreciation	$ 169,000
Office [Member] | 150 J.F. Kennedy Parkway [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	1980
Acquired	1997
Initial Costs, Land	$ 12,606
Initial Costs, Building and Improvements	50,425
Costs Capitalized Subsequent to Acquisition	20,557
Gross Amount at Which Carried at Close of Period, Land	12,606
Gross Amount at Which Carried at Close of Period, Building and Improvements	70,981
Total	83,588
Accumulated Depreciation	$ 33,544
Office [Member] | 51 J.F. Kennedy Parkway [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	1988
Acquired	2017
Related Encumbrances	$ 69,592
Initial Costs, Land	5,873
Initial Costs, Building and Improvements	100,359
Costs Capitalized Subsequent to Acquisition	1,827
Gross Amount at Which Carried at Close of Period, Land	5,873
Gross Amount at Which Carried at Close of Period, Building and Improvements	102,186
Total	108,059
Accumulated Depreciation	$ 10,575
Office [Member] | 101 J.F. Kennedy Parkway [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	1981
Acquired	2017
Related Encumbrances	$ 29,254
Initial Costs, Land	4,380
Initial Costs, Building and Improvements	59,730
Costs Capitalized Subsequent to Acquisition	3,611
Gross Amount at Which Carried at Close of Period, Land	4,380
Gross Amount at Which Carried at Close of Period, Building and Improvements	63,341
Total	67,721
Accumulated Depreciation	$ 6,304
Office [Member] | 103 J.F. Kennedy Parkway [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	1981
Acquired	2017
Related Encumbrances	$ 24,922
Initial Costs, Land	3,158
Initial Costs, Building and Improvements	50,813
Costs Capitalized Subsequent to Acquisition	1,416
Gross Amount at Which Carried at Close of Period, Land	3,158
Gross Amount at Which Carried at Close of Period, Building and Improvements	52,230
Total	55,387
Accumulated Depreciation	$ 5,316
Office [Member] | 111 River St. [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	2002
Acquired	2016
Related Encumbrances	$ 148,752
Initial Costs, Building and Improvements	198,609
Costs Capitalized Subsequent to Acquisition	21,683
Gross Amount at Which Carried at Close of Period, Building and Improvements	220,292
Total	220,292
Accumulated Depreciation	$ 27,079
Office [Member] | Harborside Plaza 2 [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	1990
Acquired	1996
Initial Costs, Land	$ 17,655
Initial Costs, Building and Improvements	101,546
Costs Capitalized Subsequent to Acquisition	70,511
Gross Amount at Which Carried at Close of Period, Land	8,363
Gross Amount at Which Carried at Close of Period, Building and Improvements	181,349
Total	189,712
Accumulated Depreciation	$ 82,073
Office [Member] | Harborside Plaza 3 [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	1990
Acquired	1996
Initial Costs, Land	$ 17,655
Initial Costs, Building and Improvements	101,878
Costs Capitalized Subsequent to Acquisition	70,179
Gross Amount at Which Carried at Close of Period, Land	8,363
Gross Amount at Which Carried at Close of Period, Building and Improvements	181,349
Total	189,712
Accumulated Depreciation	$ 82,073
Office [Member] | Harborside Plaza 4A [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	2000
Acquired	2000
Initial Costs, Land	$ 1,244
Initial Costs, Building and Improvements	56,144
Costs Capitalized Subsequent to Acquisition	14,729
Gross Amount at Which Carried at Close of Period, Land	1,244
Gross Amount at Which Carried at Close of Period, Building and Improvements	70,873
Total	72,117
Accumulated Depreciation	$ 36,218
Office [Member] | Harborside Plaza 5 [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	2002
Acquired	2002
Initial Costs, Land	$ 6,218
Initial Costs, Building and Improvements	170,682
Costs Capitalized Subsequent to Acquisition	62,793
Gross Amount at Which Carried at Close of Period, Land	5,705
Gross Amount at Which Carried at Close of Period, Building and Improvements	233,988
Total	239,693
Accumulated Depreciation	$ 111,452
Office [Member] | 101 Hudson [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	1992
Acquired	2005
Related Encumbrances	$ 248,857
Initial Costs, Land	45,530
Initial Costs, Building and Improvements	271,376
Costs Capitalized Subsequent to Acquisition	48,131
Gross Amount at Which Carried at Close of Period, Land	45,530
Gross Amount at Which Carried at Close of Period, Building and Improvements	319,507
Total	365,037
Accumulated Depreciation	$ 121,970
Office [Member] | 100 Overlook Center [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	1988
Acquired	1997
Initial Costs, Land	$ 2,378
Initial Costs, Building and Improvements	21,754
Costs Capitalized Subsequent to Acquisition	9,424
Gross Amount at Which Carried at Close of Period, Land	2,378
Gross Amount at Which Carried at Close of Period, Building and Improvements	31,178
Total	33,556
Accumulated Depreciation	$ 14,453
Office [Member] | 333 Thornall Street [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	1984
Acquired	2015
Initial Costs, Land	$ 5,542
Initial Costs, Building and Improvements	40,762
Costs Capitalized Subsequent to Acquisition	6,770
Gross Amount at Which Carried at Close of Period, Land	5,542
Gross Amount at Which Carried at Close of Period, Building and Improvements	47,533
Total	53,074
Accumulated Depreciation	$ 5,994
Office [Member] | 343 Thornall Street [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	1991
Acquired	2006
Initial Costs, Land	$ 6,027
Initial Costs, Building and Improvements	39,101
Costs Capitalized Subsequent to Acquisition	15,605
Gross Amount at Which Carried at Close of Period, Land	6,027
Gross Amount at Which Carried at Close of Period, Building and Improvements	54,706
Total	60,733
Accumulated Depreciation	$ 16,399
Office [Member] | 99 Wood Avenue South [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	1987
Acquired	2019
Initial Costs, Land	$ 9,261
Initial Costs, Building and Improvements	45,576
Costs Capitalized Subsequent to Acquisition	435
Gross Amount at Which Carried at Close of Period, Land	9,261
Gross Amount at Which Carried at Close of Period, Building and Improvements	46,011
Total	55,272
Accumulated Depreciation	$ 2,064
Office [Member] | 101 Wood Avenue South [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	1990
Acquired	2016
Initial Costs, Land	$ 8,509
Initial Costs, Building and Improvements	72,738
Costs Capitalized Subsequent to Acquisition	1,111
Gross Amount at Which Carried at Close of Period, Land	7,384
Gross Amount at Which Carried at Close of Period, Building and Improvements	74,973
Total	82,358
Accumulated Depreciation	$ 9,342
Office [Member] | 23 Main Street [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	1977
Acquired	2005
Initial Costs, Land	$ 4,336
Initial Costs, Building and Improvements	19,544
Costs Capitalized Subsequent to Acquisition	6,400
Gross Amount at Which Carried at Close of Period, Land	4,336
Gross Amount at Which Carried at Close of Period, Building and Improvements	25,944
Total	30,280
Accumulated Depreciation	$ 10,486
Office [Member] | One River Center, Building 1 [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	1983
Acquired	2004
Initial Costs, Land	$ 3,070
Initial Costs, Building and Improvements	17,414
Costs Capitalized Subsequent to Acquisition	17,290
Gross Amount at Which Carried at Close of Period, Land	2,451
Gross Amount at Which Carried at Close of Period, Building and Improvements	35,323
Total	37,774
Accumulated Depreciation	$ 9,762
Office [Member] | One River Center, Building 2 [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	1983
Acquired	2004
Initial Costs, Land	$ 2,468
Initial Costs, Building and Improvements	15,043
Costs Capitalized Subsequent to Acquisition	3,657
Gross Amount at Which Carried at Close of Period, Land	2,452
Gross Amount at Which Carried at Close of Period, Building and Improvements	18,716
Total	21,168
Accumulated Depreciation	$ 8,081
Office [Member] | One River Center, Building 3 [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	1984
Acquired	2004
Initial Costs, Land	$ 4,051
Initial Costs, Building and Improvements	24,790
Costs Capitalized Subsequent to Acquisition	7,660
Gross Amount at Which Carried at Close of Period, Land	4,627
Gross Amount at Which Carried at Close of Period, Building and Improvements	31,874
Total	36,501
Accumulated Depreciation	$ 12,478
Office [Member] | 100 Schultz Drive [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	1989
Acquired	2017
Initial Costs, Land	$ 1,953
Initial Costs, Building and Improvements	6,790
Costs Capitalized Subsequent to Acquisition	3,932
Gross Amount at Which Carried at Close of Period, Land	1,953
Gross Amount at Which Carried at Close of Period, Building and Improvements	10,722
Total	12,675
Accumulated Depreciation	$ 949
Office [Member] | 200 Schultz Drive [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	1989
Acquired	2017
Initial Costs, Land	$ 2,184
Initial Costs, Building and Improvements	8,259
Costs Capitalized Subsequent to Acquisition	3,528
Gross Amount at Which Carried at Close of Period, Land	2,184
Gross Amount at Which Carried at Close of Period, Building and Improvements	11,787
Total	13,971
Accumulated Depreciation	$ 1,477
Office [Member] | 7 Giralda Farms [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	1997
Acquired	2017
Initial Costs, Land	$ 5,402
Initial Costs, Building and Improvements	37,664
Costs Capitalized Subsequent to Acquisition	1,295
Gross Amount at Which Carried at Close of Period, Land	5,402
Gross Amount at Which Carried at Close of Period, Building and Improvements	38,959
Total	44,361
Accumulated Depreciation	$ 4,251
Office [Member] | 4 Gatehall Drive [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	1988
Acquired	2000
Initial Costs, Land	$ 8,452
Initial Costs, Building and Improvements	33,929
Costs Capitalized Subsequent to Acquisition	10,521
Gross Amount at Which Carried at Close of Period, Land	8,452
Gross Amount at Which Carried at Close of Period, Building and Improvements	44,450
Total	52,902
Accumulated Depreciation	20,052
Land [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Real Estate Held-for-sale	$ 164,200
Multi-Family Properties [Member] | Soho Lofts [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	2017
Acquired	2019
Related Encumbrances	$ 158,993
Initial Costs, Land	27,601
Initial Costs, Building and Improvements	224,039
Costs Capitalized Subsequent to Acquisition	2,603
Gross Amount at Which Carried at Close of Period, Land	27,601
Gross Amount at Which Carried at Close of Period, Building and Improvements	226,642
Total	254,243
Accumulated Depreciation	$ 11,832
Multi-Family Properties [Member] | Liberty Towers [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	2003
Acquired	2019
Related Encumbrances	$ 263,484
Initial Costs, Land	66,670
Initial Costs, Building and Improvements	328,347
Costs Capitalized Subsequent to Acquisition	3,434
Gross Amount at Which Carried at Close of Period, Land	66,670
Gross Amount at Which Carried at Close of Period, Building and Improvements	331,782
Total	398,451
Accumulated Depreciation	$ 10,792
Multi-Family Properties [Member] | BLVD 475 N/S [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	2011
Acquired	2017
Related Encumbrances	$ 164,900
Initial Costs, Land	58,761
Initial Costs, Building and Improvements	240,871
Costs Capitalized Subsequent to Acquisition	6,268
Gross Amount at Which Carried at Close of Period, Land	58,761
Gross Amount at Which Carried at Close of Period, Building and Improvements	247,140
Total	305,900
Accumulated Depreciation	$ 25,198
Multi-Family Properties [Member] | Marbella [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	2003
Acquired	2018
Related Encumbrances	$ 130,293
Initial Costs, Land	48,820
Initial Costs, Building and Improvements	160,740
Costs Capitalized Subsequent to Acquisition	5,030
Gross Amount at Which Carried at Close of Period, Land	48,820
Gross Amount at Which Carried at Close of Period, Building and Improvements	165,770
Total	214,590
Accumulated Depreciation	$ 10,989
Multi-Family Properties [Member] | Marbella II [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	2016
Acquired	2019
Related Encumbrances	$ 116,349
Initial Costs, Land	36,595
Initial Costs, Building and Improvements	152,440
Costs Capitalized Subsequent to Acquisition	225
Gross Amount at Which Carried at Close of Period, Land	36,595
Gross Amount at Which Carried at Close of Period, Building and Improvements	152,664
Total	189,260
Accumulated Depreciation	$ 7,859
Multi-Family Properties [Member] | Port Imperial South 11 [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	2018
Acquired	2018
Related Encumbrances	$ 99,834
Initial Costs, Land	22,047
Costs Capitalized Subsequent to Acquisition	112,052
Gross Amount at Which Carried at Close of Period, Land	22,047
Gross Amount at Which Carried at Close of Period, Building and Improvements	112,051
Total	134,099
Accumulated Depreciation	$ 7,428
Multi-Family Properties [Member] | Signature Place At Morris Plains [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	2018
Acquired	2018
Related Encumbrances	$ 42,656
Initial Costs, Land	930
Costs Capitalized Subsequent to Acquisition	56,410
Gross Amount at Which Carried at Close of Period, Land	930
Gross Amount at Which Carried at Close of Period, Building and Improvements	56,410
Total	57,340
Accumulated Depreciation	$ 4,403
Multi-Family Properties [Member] | Quarry Place At Tuckahoe [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	2016
Acquired	2016
Related Encumbrances	$ 40,565
Initial Costs, Land	5,585
Initial Costs, Building and Improvements	3,400
Costs Capitalized Subsequent to Acquisition	48,934
Gross Amount at Which Carried at Close of Period, Land	5,585
Gross Amount at Which Carried at Close of Period, Building and Improvements	52,334
Total	57,919
Accumulated Depreciation	$ 6,148
Multi-Family Properties [Member] | Emery At Overlook Ridge [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	2020
Acquired	2014
Related Encumbrances	$ 71,361
Initial Costs, Land	4,115
Initial Costs, Building and Improvements	86,093
Costs Capitalized Subsequent to Acquisition	9,740
Gross Amount at Which Carried at Close of Period, Land	9,104
Gross Amount at Which Carried at Close of Period, Building and Improvements	90,844
Total	99,948
Accumulated Depreciation	$ 1,904
Multi-Family Properties [Member] | Portside At Pier One [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	2016
Acquired	2016
Related Encumbrances	$ 58,801
Initial Costs, Building and Improvements	73,713
Costs Capitalized Subsequent to Acquisition	634
Gross Amount at Which Carried at Close of Period, Building and Improvements	74,347
Total	74,347
Accumulated Depreciation	$ 11,523
Multi-Family Properties [Member] | Portside 5/6 [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	2018
Acquired	2018
Related Encumbrances	$ 96,545
Initial Costs, Building and Improvements	37,114
Costs Capitalized Subsequent to Acquisition	77,240
Gross Amount at Which Carried at Close of Period, Building and Improvements	114,354
Total	114,354
Accumulated Depreciation	$ 8,694
Multi-Family Properties [Member] | 145 Front Street [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	2018
Acquired	2015
Related Encumbrances	$ 62,574
Initial Costs, Land	4,380
Costs Capitalized Subsequent to Acquisition	92,148
Gross Amount at Which Carried at Close of Period, Land	4,380
Gross Amount at Which Carried at Close of Period, Building and Improvements	92,148
Total	96,528
Accumulated Depreciation	$ 7,695
Other Property [Member] | 100 Avenue At Port Imperial [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	2016
Acquired	2016
Initial Costs, Land	$ 350
Costs Capitalized Subsequent to Acquisition	30,734
Gross Amount at Which Carried at Close of Period, Land	1,958
Gross Amount at Which Carried at Close of Period, Building and Improvements	29,126
Total	31,084
Accumulated Depreciation	$ 4,443
Other Property [Member] | 500 Avenue At Port Imperial [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	2013
Acquired	2013
Related Encumbrances	$ 36,750
Initial Costs, Land	13,099
Initial Costs, Building and Improvements	56,669
Costs Capitalized Subsequent to Acquisition	(19,362)
Gross Amount at Which Carried at Close of Period, Land	13,099
Gross Amount at Which Carried at Close of Period, Building and Improvements	37,308
Total	50,406
Accumulated Depreciation	$ 8,174
Other Property [Member] | Autograph Collection By Marriott (Phase II) [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	2019
Acquired	2015
Related Encumbrances	$ 93,481
Initial Costs, Land	23,660
Costs Capitalized Subsequent to Acquisition	81,362
Gross Amount at Which Carried at Close of Period, Land	18,059
Gross Amount at Which Carried at Close of Period, Building and Improvements	86,963
Total	105,022
Accumulated Depreciation	$ 9,171
Other Property [Member] | Port Imperial North Retail, L.L.C. [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Year Built	2008
Acquired	2020
Initial Costs, Land	$ 4,305
Initial Costs, Building and Improvements	8,216
Costs Capitalized Subsequent to Acquisition	695
Gross Amount at Which Carried at Close of Period, Land	4,305
Gross Amount at Which Carried at Close of Period, Building and Improvements	8,911
Total	13,216
Accumulated Depreciation	369
Other Property [Member] | 34 Sylvan Way [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Initial Costs, Land	37,873
Initial Costs, Building and Improvements	550
Costs Capitalized Subsequent to Acquisition	42,390
Gross Amount at Which Carried at Close of Period, Land	45,840
Gross Amount at Which Carried at Close of Period, Building and Improvements	34,973
Total	80,813
Accumulated Depreciation	6,634
Projects Under Development And Developable Land [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Related Encumbrances	246,180
Initial Costs, Land	282,423
Initial Costs, Building and Improvements	811,274
Gross Amount at Which Carried at Close of Period, Land	282,423
Gross Amount at Which Carried at Close of Period, Building and Improvements	811,274
Total	1,093,697
Accumulated Depreciation	49,717
Furniture, Fixtures And Equipment [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Costs Capitalized Subsequent to Acquisition	83,552
Gross Amount at Which Carried at Close of Period, Building and Improvements	83,552
Total	$ 83,552
Buildings And Improvements [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Useful Live	40 years
Real Estate Held-for-sale	$ 779,900
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Total	5,580,716
Accumulated Depreciation	$ 825,361

Real Estate Investments And A_3

Real Estate Investments And Accumulated Depreciation (Schedule Of Changes In Rental Properties And Accumulated Depreciation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Real Estate Investments And Accumulated Depreciation [Abstract]
Rental Properties, Balance at beginning of year	$ 4,256,681	$ 5,306,017	$ 5,102,844
Rental Properties, Additions	1,776,276	1,349,959	686,452
Rental Properties, Real estate held for sale	(944,082)	(1,553,383)	(184,233)
Rental Properties, Properties sold	(443,755)	(824,167)	(238,873)
Rental Properties, Retirements/disposals	(6,477)	(21,745)	(60,173)
Rental Properties, Balance at end of year	4,638,643	4,256,681	5,306,017
Accumulated Depreciation, Balance at beginning of year	558,617	1,097,868	1,087,083
Accumulated Depreciation, Depreciation expense	104,421	156,250	140,726
Accumulated Depreciation, Real estate held for sale	2,238	(411,833)	(30,404)
Accumulated Depreciation, Properties sold		(261,923)	(39,364)
Accumulated Depreciation, Impairments	(2,469)
Accumulated Depreciation, Retirements/disposals	(6,477)	(21,745)	(60,173)
Accumulated Depreciation, Balance at end of year	$ 656,331	$ 558,617	$ 1,097,868