Annual report pursuant to Section 13 and 15(d)

Real Estate Investments And Accumulated Depreciation (Schedule Of Real Estate Investments And Accumulated Depreciation) (Details)

v3.19.3.a.u2
Real Estate Investments And Accumulated Depreciation (Schedule Of Real Estate Investments And Accumulated Depreciation) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Related Encumbrances $ 1,908,034      
Initial Costs, Land 893,154      
Initial Costs, Building and Improvements 3,737,148      
Costs Capitalized Subsequent to Acquisition 1,179,762      
Gross Amount at Which Carried at Close of Period, Land 889,219      
Gross Amount at Which Carried at Close of Period, Building and Improvements 4,920,845      
Total 4,256,681 $ 5,306,017 $ 5,102,844 $ 4,804,867
Accumulated Depreciation 558,617 $ 1,097,868 $ 1,087,083 $ 1,332,073
Real Estate Aggregate Cost, Tax Purpose 4,100,000      
Real Estate Held-for-sale Accumulated Depreciation $ 412,800      
Office [Member] | One Bridge Plaza [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Year Built 1981      
Acquired 1996      
Initial Costs, Land $ 2,439      
Initial Costs, Building and Improvements 24,462      
Costs Capitalized Subsequent to Acquisition 8,034      
Gross Amount at Which Carried at Close of Period, Land 2,439      
Gross Amount at Which Carried at Close of Period, Building and Improvements 32,496      
Total 34,935      
Accumulated Depreciation $ 18,181      
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 20,119      
Gross Amount at Which Carried at Close of Period, Land 12,606      
Gross Amount at Which Carried at Close of Period, Building and Improvements 70,544      
Total 83,150      
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 $ 69,525      
Initial Costs, Land 5,873      
Initial Costs, Building and Improvements 100,359      
Costs Capitalized Subsequent to Acquisition 1,129      
Gross Amount at Which Carried at Close of Period, Land 5,873      
Gross Amount at Which Carried at Close of Period, Building and Improvements 101,488      
Total 107,361      
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 $ 29,225      
Initial Costs, Land 4,380      
Initial Costs, Building and Improvements 59,730      
Costs Capitalized Subsequent to Acquisition 2,224      
Gross Amount at Which Carried at Close of Period, Land 4,380      
Gross Amount at Which Carried at Close of Period, Building and Improvements 61,954      
Total 66,334      
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 $ 24,899      
Initial Costs, Land 3,158      
Initial Costs, Building and Improvements 50,813      
Costs Capitalized Subsequent to Acquisition 1,337      
Gross Amount at Which Carried at Close of Period, Land 3,158      
Gross Amount at Which Carried at Close of Period, Building and Improvements 52,150      
Total 55,308      
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 $ 148,582      
Initial Costs, Building and Improvements 198,609      
Costs Capitalized Subsequent to Acquisition 18,073      
Gross Amount at Which Carried at Close of Period, Building and Improvements 216,682      
Total 216,682      
Accumulated Depreciation $ 20,643      
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 69,341      
Gross Amount at Which Carried at Close of Period, Land 8,364      
Gross Amount at Which Carried at Close of Period, Building and Improvements 180,178      
Total 188,542      
Accumulated Depreciation $ 75,555      
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 69,007      
Gross Amount at Which Carried at Close of Period, Land 8,363      
Gross Amount at Which Carried at Close of Period, Building and Improvements 180,177      
Total 188,540      
Accumulated Depreciation $ 75,555      
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 9,542      
Gross Amount at Which Carried at Close of Period, Land 1,244      
Gross Amount at Which Carried at Close of Period, Building and Improvements 65,686      
Total 66,930      
Accumulated Depreciation $ 33,741      
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 59,640      
Gross Amount at Which Carried at Close of Period, Land 5,705      
Gross Amount at Which Carried at Close of Period, Building and Improvements 230,835      
Total 236,540      
Accumulated Depreciation $ 104,813      
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 $ 248,659      
Initial Costs, Land 45,530      
Initial Costs, Building and Improvements 271,376      
Costs Capitalized Subsequent to Acquisition 38,827      
Gross Amount at Which Carried at Close of Period, Land 45,530      
Gross Amount at Which Carried at Close of Period, Building and Improvements 310,203      
Total 355,733      
Accumulated Depreciation $ 110,891      
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 8,441      
Gross Amount at Which Carried at Close of Period, Land 2,378      
Gross Amount at Which Carried at Close of Period, Building and Improvements 30,195      
Total 32,573      
Accumulated Depreciation $ 14,453      
Office [Member] | 5 Vaughn Drive [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Year Built 1987      
Acquired 1995      
Initial Costs, Land $ 657      
Initial Costs, Building and Improvements 9,800      
Costs Capitalized Subsequent to Acquisition 2,004      
Gross Amount at Which Carried at Close of Period, Land 657      
Gross Amount at Which Carried at Close of Period, Building and Improvements 11,804      
Total 12,461      
Accumulated Depreciation $ 6,868      
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 4,991      
Gross Amount at Which Carried at Close of Period, Land 5,542      
Gross Amount at Which Carried at Close of Period, Building and Improvements 45,754      
Total 51,295      
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 14,720      
Gross Amount at Which Carried at Close of Period, Land 6,027      
Gross Amount at Which Carried at Close of Period, Building and Improvements 53,822      
Total 59,848      
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 142      
Gross Amount at Which Carried at Close of Period, Land 9,261      
Gross Amount at Which Carried at Close of Period, Building and Improvements 45,718      
Total 54,979      
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 913      
Gross Amount at Which Carried at Close of Period, Land 7,384      
Gross Amount at Which Carried at Close of Period, Building and Improvements 74,776      
Total 82,160      
Accumulated Depreciation $ 9,342      
Office [Member] | 500 College Road East [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Year Built 1984      
Acquired 1998      
Initial Costs, Land $ 614      
Initial Costs, Building and Improvements 20,626      
Costs Capitalized Subsequent to Acquisition 5,553      
Gross Amount at Which Carried at Close of Period, Land 614      
Gross Amount at Which Carried at Close of Period, Building and Improvements 26,179      
Total 26,793      
Accumulated Depreciation $ 15,053      
Office [Member] | 581 Main Street [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Year Built 1991      
Acquired 1997      
Initial Costs, Land $ 3,237      
Initial Costs, Building and Improvements 12,949      
Costs Capitalized Subsequent to Acquisition 35,066      
Gross Amount at Which Carried at Close of Period, Land 8,115      
Gross Amount at Which Carried at Close of Period, Building and Improvements 43,137      
Total 51,252      
Accumulated Depreciation $ 16,907      
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 6,411      
Gross Amount at Which Carried at Close of Period, Land 4,336      
Gross Amount at Which Carried at Close of Period, Building and Improvements 25,956      
Total 30,291      
Accumulated Depreciation $ 9,301      
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 16,618      
Gross Amount at Which Carried at Close of Period, Land 2,451      
Gross Amount at Which Carried at Close of Period, Building and Improvements 34,651      
Total 37,102      
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 7,250      
Gross Amount at Which Carried at Close of Period, Land 4,627      
Gross Amount at Which Carried at Close of Period, Building and Improvements 31,464      
Total 36,091      
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 4,301      
Gross Amount at Which Carried at Close of Period, Land 1,953      
Gross Amount at Which Carried at Close of Period, Building and Improvements 11,091      
Total 13,044      
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 3,187      
Gross Amount at Which Carried at Close of Period, Land 2,184      
Gross Amount at Which Carried at Close of Period, Building and Improvements 11,446      
Total 13,630      
Accumulated Depreciation $ 1,477      
Office [Member] | 325 Columbia Parkway [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Year Built 1987      
Acquired 1994      
Initial Costs, Land $ 1,564      
Costs Capitalized Subsequent to Acquisition 18,072      
Gross Amount at Which Carried at Close of Period, Land 1,564      
Gross Amount at Which Carried at Close of Period, Building and Improvements 18,072      
Total 19,636      
Accumulated Depreciation $ 13,082      
Office [Member] | 1 Giralda Farms [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Year Built 1982      
Acquired 2017      
Initial Costs, Land $ 3,370      
Initial Costs, Building and Improvements 27,145      
Costs Capitalized Subsequent to Acquisition 2,177      
Gross Amount at Which Carried at Close of Period, Land 3,370      
Gross Amount at Which Carried at Close of Period, Building and Improvements 29,322      
Total 32,692      
Accumulated Depreciation $ 3,435      
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 936      
Gross Amount at Which Carried at Close of Period, Land 5,402      
Gross Amount at Which Carried at Close of Period, Building and Improvements 38,600      
Total 44,002      
Accumulated Depreciation $ 4,251      
Office [Member] | 4 Campus Drive [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Year Built 1983      
Acquired 2001      
Initial Costs, Land $ 5,213      
Initial Costs, Building and Improvements 20,984      
Costs Capitalized Subsequent to Acquisition 4,069      
Gross Amount at Which Carried at Close of Period, Land 5,213      
Gross Amount at Which Carried at Close of Period, Building and Improvements 25,053      
Total 30,266      
Accumulated Depreciation $ 12,399      
Office [Member] | 6 Campus Drive [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Year Built 1983      
Acquired 2001      
Initial Costs, Land $ 4,411      
Initial Costs, Building and Improvements 17,796      
Costs Capitalized Subsequent to Acquisition 4,044      
Gross Amount at Which Carried at Close of Period, Land 4,411      
Gross Amount at Which Carried at Close of Period, Building and Improvements 21,840      
Total 26,251      
Accumulated Depreciation $ 10,384      
Office [Member] | 7 Campus Drive [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Year Built 1982      
Acquired 1998      
Initial Costs, Land $ 1,932      
Initial Costs, Building and Improvements 27,788      
Costs Capitalized Subsequent to Acquisition 5,480      
Gross Amount at Which Carried at Close of Period, Land 1,932      
Gross Amount at Which Carried at Close of Period, Building and Improvements 33,269      
Total 35,200      
Accumulated Depreciation $ 17,953      
Office [Member] | 8 Campus Drive [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Year Built 1987      
Acquired 1998      
Initial Costs, Land $ 1,865      
Initial Costs, Building and Improvements 35,456      
Costs Capitalized Subsequent to Acquisition 12,626      
Gross Amount at Which Carried at Close of Period, Land 1,865      
Gross Amount at Which Carried at Close of Period, Building and Improvements 48,082      
Total 49,947      
Accumulated Depreciation $ 23,452      
Office [Member] | 9 Campus Drive [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Year Built 1983      
Acquired 2001      
Initial Costs, Land $ 3,277      
Initial Costs, Building and Improvements 11,796      
Costs Capitalized Subsequent to Acquisition 22,734      
Gross Amount at Which Carried at Close of Period, Land 5,842      
Gross Amount at Which Carried at Close of Period, Building and Improvements 31,965      
Total 37,807      
Accumulated Depreciation $ 14,327      
Office [Member] | 2 Dryden Way [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Year Built 1990      
Acquired 1998      
Initial Costs, Land $ 778      
Initial Costs, Building and Improvements 420      
Costs Capitalized Subsequent to Acquisition 110      
Gross Amount at Which Carried at Close of Period, Land 778      
Gross Amount at Which Carried at Close of Period, Building and Improvements 530      
Total 1,308      
Accumulated Depreciation $ 338      
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 10,030      
Gross Amount at Which Carried at Close of Period, Land 8,452      
Gross Amount at Which Carried at Close of Period, Building and Improvements 43,959      
Total 52,411      
Accumulated Depreciation $ 20,052      
Office [Member] | 2 Hilton Court [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Year Built 1991      
Acquired 1998      
Initial Costs, Land $ 1,971      
Initial Costs, Building and Improvements 32,007      
Costs Capitalized Subsequent to Acquisition 4,495      
Gross Amount at Which Carried at Close of Period, Land 1,971      
Gross Amount at Which Carried at Close of Period, Building and Improvements 36,502      
Total 38,473      
Accumulated Depreciation $ 21,059      
Office [Member] | 1 Sylvan Way [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Year Built 1989      
Acquired 1998      
Initial Costs, Land $ 1,689      
Initial Costs, Building and Improvements 24,699      
Costs Capitalized Subsequent to Acquisition 5,675      
Gross Amount at Which Carried at Close of Period, Land 1,021      
Gross Amount at Which Carried at Close of Period, Building and Improvements 31,042      
Total 32,063      
Accumulated Depreciation $ 15,040      
Office [Member] | 3 Sylvan Way [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Year Built 1988      
Acquired 2015      
Initial Costs, Land $ 5,590      
Initial Costs, Building and Improvements 4,710      
Costs Capitalized Subsequent to Acquisition 10,952      
Gross Amount at Which Carried at Close of Period, Land 5,590      
Gross Amount at Which Carried at Close of Period, Building and Improvements 15,663      
Total 21,252      
Accumulated Depreciation $ 1,585      
Office [Member] | 5 Sylvan Way [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Year Built 1989      
Acquired 1998      
Initial Costs, Land $ 1,160      
Initial Costs, Building and Improvements 25,214      
Costs Capitalized Subsequent to Acquisition 7,835      
Gross Amount at Which Carried at Close of Period, Land 1,161      
Gross Amount at Which Carried at Close of Period, Building and Improvements 33,049      
Total 34,209      
Accumulated Depreciation $ 15,475      
Office [Member] | 7 Sylvan Way [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Year Built 1987      
Acquired 1998      
Initial Costs, Land $ 2,084      
Initial Costs, Building and Improvements 26,083      
Costs Capitalized Subsequent to Acquisition 16,396      
Gross Amount at Which Carried at Close of Period, Land 2,084      
Gross Amount at Which Carried at Close of Period, Building and Improvements 42,479      
Total 44,563      
Accumulated Depreciation 23,457      
Land [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Real Estate Held-for-sale $ 235,300      
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 $ 158,875      
Initial Costs, Land 27,601      
Initial Costs, Building and Improvements 224,039      
Costs Capitalized Subsequent to Acquisition 1,166      
Gross Amount at Which Carried at Close of Period, Land 27,601      
Gross Amount at Which Carried at Close of Period, Building and Improvements 225,205      
Total 252,806      
Accumulated Depreciation $ 4,220      
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 $ 230,667      
Initial Costs, Land 66,670      
Initial Costs, Building and Improvements 328,347      
Costs Capitalized Subsequent to Acquisition 398      
Gross Amount at Which Carried at Close of Period, Land 66,670      
Gross Amount at Which Carried at Close of Period, Building and Improvements 328,745      
Total 395,415      
Accumulated Depreciation $ 2,075      
Multi-Family Properties [Member] | RoseGarden Monaco, L.L.C. [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Year Built 2011      
Acquired 2017      
Related Encumbrances $ 166,753      
Initial Costs, Land 58,761      
Initial Costs, Building and Improvements 240,871      
Costs Capitalized Subsequent to Acquisition 3,891      
Gross Amount at Which Carried at Close of Period, Land 58,761      
Gross Amount at Which Carried at Close of Period, Building and Improvements 244,762      
Total 303,523      
Accumulated Depreciation $ 16,861      
Multi-Family Properties [Member] | Marbella I [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Year Built 2003      
Acquired 2018      
Related Encumbrances $ 130,167      
Initial Costs, Land 48,820      
Initial Costs, Building and Improvements 160,740      
Costs Capitalized Subsequent to Acquisition 3,665      
Gross Amount at Which Carried at Close of Period, Land 48,820      
Gross Amount at Which Carried at Close of Period, Building and Improvements 164,405      
Total 213,225      
Accumulated Depreciation $ 5,845      
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 $ 116,252      
Initial Costs, Land 36,595      
Initial Costs, Building and Improvements 152,440      
Costs Capitalized Subsequent to Acquisition 93      
Gross Amount at Which Carried at Close of Period, Land 36,595      
Gross Amount at Which Carried at Close of Period, Building and Improvements 152,533      
Total 189,128      
Accumulated Depreciation $ 3,542      
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 $ 99,813      
Initial Costs, Land 22,047      
Costs Capitalized Subsequent to Acquisition 108,721      
Gross Amount at Which Carried at Close of Period, Land 22,047      
Gross Amount at Which Carried at Close of Period, Building and Improvements 108,721      
Total 130,768      
Accumulated Depreciation $ 3,398      
Multi-Family Properties [Member] | Richmond Court [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Year Built 1997      
Acquired 2013      
Related Encumbrances $ 29,759      
Initial Costs, Land 2,992      
Initial Costs, Building and Improvements 13,534      
Costs Capitalized Subsequent to Acquisition 1,908      
Gross Amount at Which Carried at Close of Period, Land 2,992      
Gross Amount at Which Carried at Close of Period, Building and Improvements 15,442      
Total 18,434      
Accumulated Depreciation $ 2,293      
Multi-Family Properties [Member] | Riverwatch Commons [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Year Built 1995      
Acquired 2013      
Initial Costs, Land $ 4,169      
Initial Costs, Building and Improvements 18,974      
Costs Capitalized Subsequent to Acquisition 2,196      
Gross Amount at Which Carried at Close of Period, Land 4,169      
Gross Amount at Which Carried at Close of Period, Building and Improvements 21,170      
Total 25,339      
Accumulated Depreciation $ 3,120      
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 $ 42,560      
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 $ 2,410      
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 $ 40,499      
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 $ 4,007      
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 $ 58,723      
Initial Costs, Building and Improvements 73,713      
Costs Capitalized Subsequent to Acquisition 560      
Gross Amount at Which Carried at Close of Period, Building and Improvements 74,273      
Total 74,273      
Accumulated Depreciation $ 8,432      
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 $ 96,457      
Initial Costs, Building and Improvements 37,114      
Costs Capitalized Subsequent to Acquisition 77,257      
Gross Amount at Which Carried at Close of Period, Building and Improvements 114,371      
Total 114,371      
Accumulated Depreciation $ 4,178      
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 $ 62,687      
Initial Costs, Land 4,380      
Costs Capitalized Subsequent to Acquisition 92,147      
Gross Amount at Which Carried at Close of Period, Land 4,380      
Gross Amount at Which Carried at Close of Period, Building and Improvements 92,147      
Total 96,527      
Accumulated Depreciation $ 3,791      
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 30,811      
Gross Amount at Which Carried at Close of Period, Land 1,958      
Gross Amount at Which Carried at Close of Period, Building and Improvements 29,203      
Total 31,161      
Accumulated Depreciation $ 3,435      
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 $ 37,315      
Initial Costs, Land 13,099      
Initial Costs, Building and Improvements 56,669      
Costs Capitalized Subsequent to Acquisition (19,361)      
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 50,407      
Accumulated Depreciation $ 5,904      
Other Property [Member] | Residence Inn/Autograph Collection By Marriott [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Year Built 2019      
Acquired 2015      
Related Encumbrances $ 75,029      
Initial Costs, Land 23,660      
Costs Capitalized Subsequent to Acquisition 113,702      
Gross Amount at Which Carried at Close of Period, Land 23,660      
Gross Amount at Which Carried at Close of Period, Building and Improvements 113,702      
Total 137,362      
Accumulated Depreciation 2,031      
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 41,588      
Initial Costs, Land 319,819      
Initial Costs, Building and Improvements 559,896      
Gross Amount at Which Carried at Close of Period, Land 319,819      
Gross Amount at Which Carried at Close of Period, Building and Improvements 559,896      
Total 879,715      
Accumulated Depreciation 52,082      
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 78,716      
Gross Amount at Which Carried at Close of Period, Building and Improvements 78,716      
Total 78,716      
Accumulated Depreciation $ 16,610      
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 $ 1,300,000      
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 5,810,064      
Accumulated Depreciation $ 971,402