Schedule III: Real Estate and Accumulated Depreciation - Schedule of Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Buildings and improvements	$ 1,593,802	$ 1,322,381
Total real estate	2,214,623	1,963,483
Accumulated Depreciation	(580,802)	(530,722)
Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	1,153,944
Initial Cost, Land	624,352
Initial Cost, Buildings and Improvements	616,917
Total Initial Acquisition Costs	1,241,269
Costs Capitalized Subsequent to Consolidation	973,354
Land	620,821
Buildings and improvements	1,593,802
Total real estate	2,214,623
Accumulated Depreciation	$ (580,802)
Royal Crest Estates [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Marlborough, MA
Encumbrances	$ 69,918
Initial Cost, Land	25,178
Initial Cost, Buildings and Improvements	28,786
Total Initial Acquisition Costs	53,964
Costs Capitalized Subsequent to Consolidation	13,920
Land	25,178
Buildings and improvements	42,706
Total real estate	67,884
Accumulated Depreciation	$ (36,076)
Date Acquired	Aug. 31, 2002
Operating Segments [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 770,999
Initial Cost, Land	262,408
Initial Cost, Buildings and Improvements	402,517
Total Initial Acquisition Costs	664,925
Costs Capitalized Subsequent to Consolidation	306,536
Land	262,409
Buildings and improvements	709,052
Total real estate	971,461
Accumulated Depreciation	$ (489,205)
Stabilized [Member] | Royal Crest Estates [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Warwick, RI
Initial Cost, Land	$ 22,433
Initial Cost, Buildings and Improvements	24,095
Total Initial Acquisition Costs	46,528
Costs Capitalized Subsequent to Consolidation	7,365
Land	22,433
Buildings and improvements	31,460
Total real estate	53,893
Accumulated Depreciation	$ (26,018)
Date Acquired	Aug. 31, 2002
Stabilized [Member] | Waterford Village [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Bridgewater, MA
Initial Cost, Land	$ 29,110
Initial Cost, Buildings and Improvements	28,101
Total Initial Acquisition Costs	57,211
Costs Capitalized Subsequent to Consolidation	13,151
Land	29,110
Buildings and improvements	41,252
Total real estate	70,362
Accumulated Depreciation	$ (35,370)
Date Acquired	Aug. 31, 2002
Stabilized [Member] | Wexford Village [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Worcester, MA
Initial Cost, Land	$ 6,349
Initial Cost, Buildings and Improvements	17,939
Total Initial Acquisition Costs	24,288
Costs Capitalized Subsequent to Consolidation	5,910
Land	6,349
Buildings and improvements	23,849
Total real estate	30,198
Accumulated Depreciation	$ (18,364)
Date Acquired	Aug. 31, 2002
Stabilized [Member] | Yacht Club at Brickell [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Miami, FL
Encumbrances	$ 79,691
Initial Cost, Land	31,362
Initial Cost, Buildings and Improvements	32,214
Total Initial Acquisition Costs	63,576
Costs Capitalized Subsequent to Consolidation	21,779
Land	31,363
Buildings and improvements	53,992
Total real estate	85,355
Accumulated Depreciation	$ (32,845)
Date Acquired	Dec. 31, 2003
Stabilized [Member] | Bluffs at Pacifica, The [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Pacifica, CA
Initial Cost, Land	$ 8,108
Initial Cost, Buildings and Improvements	4,132
Total Initial Acquisition Costs	12,240
Costs Capitalized Subsequent to Consolidation	17,924
Land	8,108
Buildings and improvements	22,056
Total real estate	30,164
Accumulated Depreciation	$ (15,327)
Date Acquired	Oct. 31, 2006
Separate Portfolio [Member] | 118-122 West 23rd Street [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	New York, NY
Encumbrances	$ 16,472
Initial Cost, Land	14,985
Initial Cost, Buildings and Improvements	23,459
Total Initial Acquisition Costs	38,444
Costs Capitalized Subsequent to Consolidation	5,811
Land	14,985
Buildings and improvements	29,270
Total real estate	44,255
Accumulated Depreciation	$ (12,768)
Date Acquired	Jun. 30, 2012
Separate Portfolio [Member] | Royal Crest Estates [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Nashua, NH
Encumbrances	$ 173,435
Initial Cost, Land	68,230
Initial Cost, Buildings and Improvements	45,562
Total Initial Acquisition Costs	113,792
Costs Capitalized Subsequent to Consolidation	18,536
Land	68,231
Buildings and improvements	64,097
Total real estate	132,328
Accumulated Depreciation	$ (56,642)
Date Acquired	Aug. 31, 2002
Separate Portfolio [Member] | 1045 on the Park Apartments Homes [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Atlanta, GA
Encumbrances	$ 6,007
Initial Cost, Land	2,793
Initial Cost, Buildings and Improvements	6,662
Total Initial Acquisition Costs	9,455
Costs Capitalized Subsequent to Consolidation	1,446
Land	2,793
Buildings and improvements	8,108
Total real estate	10,901
Accumulated Depreciation	$ (2,998)
Date Acquired	Jul. 31, 2013
Separate Portfolio [Member] | 2200 Grace [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Lombard, IL
Encumbrances	$ 11,193
Initial Cost, Land	642
Initial Cost, Buildings and Improvements	7,788
Total Initial Acquisition Costs	8,430
Costs Capitalized Subsequent to Consolidation	310
Land	642
Buildings and improvements	8,098
Total real estate	8,740
Accumulated Depreciation	$ (5,830)
Date Acquired	Aug. 31, 2018
Separate Portfolio [Member] | 173 E. 90th Street [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	New York, NY
Encumbrances	$ 12,138
Initial Cost, Land	12,066
Initial Cost, Buildings and Improvements	4,535
Total Initial Acquisition Costs	16,601
Costs Capitalized Subsequent to Consolidation	9,021
Land	12,067
Buildings and improvements	13,555
Total real estate	25,622
Accumulated Depreciation	$ (7,447)
Date Acquired	May 31, 2004
Separate Portfolio [Member] | 237-239 Ninth Avenue [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	New York, NY
Encumbrances	$ 6,148
Initial Cost, Land	8,495
Initial Cost, Buildings and Improvements	1,866
Total Initial Acquisition Costs	10,361
Costs Capitalized Subsequent to Consolidation	2,160
Land	8,494
Buildings and improvements	4,027
Total real estate	12,521
Accumulated Depreciation	$ (2,798)
Date Acquired	Mar. 31, 2005
Separate Portfolio [Member] | Plantation Gardens [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Plantation, FL
Encumbrances	$ 60,133
Initial Cost, Land	3,773
Initial Cost, Buildings and Improvements	19,443
Total Initial Acquisition Costs	23,216
Costs Capitalized Subsequent to Consolidation	23,863
Land	3,773
Buildings and improvements	43,306
Total real estate	47,079
Accumulated Depreciation	$ (32,870)
Date Acquired	Oct. 31, 1999
Separate Portfolio [Member] | Willow Bend [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Rolling Meadows, IL
Encumbrances	$ 43,501
Initial Cost, Land	2,717
Initial Cost, Buildings and Improvements	15,437
Total Initial Acquisition Costs	18,154
Costs Capitalized Subsequent to Consolidation	18,997
Land	2,717
Buildings and improvements	34,434
Total real estate	37,151
Accumulated Depreciation	$ (29,115)
Date Acquired	May 31, 1998
Separate Portfolio [Member] | Yorktown Apartments [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Lombard, IL
Encumbrances	$ 46,857
Initial Cost, Land	2,414
Initial Cost, Buildings and Improvements	10,374
Total Initial Acquisition Costs	12,788
Costs Capitalized Subsequent to Consolidation	52,546
Land	2,413
Buildings and improvements	62,921
Total real estate	65,334
Accumulated Depreciation	$ (46,041)
Date Acquired	Dec. 31, 1999
Separate Portfolio [Member] | Bank Lofts [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Denver, CO
Encumbrances	$ 18,540
Initial Cost, Land	3,525
Initial Cost, Buildings and Improvements	9,045
Total Initial Acquisition Costs	12,570
Costs Capitalized Subsequent to Consolidation	5,498
Land	3,525
Buildings and improvements	14,543
Total real estate	18,068
Accumulated Depreciation	$ (9,506)
Date Acquired	Apr. 30, 2001
Separate Portfolio [Member] | Eldridge [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Elmhurst, IL
Encumbrances	$ 26,691
Initial Cost, Land	3,483
Initial Cost, Buildings and Improvements	35,706
Total Initial Acquisition Costs	39,189
Costs Capitalized Subsequent to Consolidation	68
Land	3,483
Buildings and improvements	35,774
Total real estate	39,257
Accumulated Depreciation	$ (3,107)
Date Acquired	Aug. 31, 2021
Separate Portfolio [Member] | Elm Creek [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Elmhurst, IL
Encumbrances	$ 78,095
Initial Cost, Land	5,910
Initial Cost, Buildings and Improvements	30,830
Total Initial Acquisition Costs	36,740
Costs Capitalized Subsequent to Consolidation	31,386
Land	5,910
Buildings and improvements	62,216
Total real estate	68,126
Accumulated Depreciation	$ (42,430)
Date Acquired	Dec. 31, 1997
Separate Portfolio [Member] | Evanston Place [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Evanston, IL
Encumbrances	$ 46,670
Initial Cost, Land	3,232
Initial Cost, Buildings and Improvements	25,546
Total Initial Acquisition Costs	28,778
Costs Capitalized Subsequent to Consolidation	18,291
Land	3,232
Buildings and improvements	43,837
Total real estate	47,069
Accumulated Depreciation	$ (26,822)
Date Acquired	Dec. 31, 1997
Separate Portfolio [Member] | Hillmeade [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Nashville, TN
Encumbrances	$ 46,026
Initial Cost, Land	2,872
Initial Cost, Buildings and Improvements	16,070
Total Initial Acquisition Costs	18,942
Costs Capitalized Subsequent to Consolidation	22,704
Land	2,872
Buildings and improvements	38,774
Total real estate	41,646
Accumulated Depreciation	$ (28,777)
Date Acquired	Nov. 30, 1994
Separate Portfolio [Member] | Hyde Park Tower [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Chicago, IL
Encumbrances	$ 29,484
Initial Cost, Land	4,731
Initial Cost, Buildings and Improvements	14,927
Total Initial Acquisition Costs	19,658
Costs Capitalized Subsequent to Consolidation	15,850
Land	4,731
Buildings and improvements	30,777
Total real estate	35,508
Accumulated Depreciation	$ (18,054)
Date Acquired	Oct. 31, 2004
Development and Redevelopment [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 301,442
Initial Cost, Land	211,818
Initial Cost, Buildings and Improvements	60,585
Total Initial Acquisition Costs	272,403
Costs Capitalized Subsequent to Consolidation	655,800
Land	208,323
Buildings and improvements	719,880
Total real estate	928,203
Accumulated Depreciation	$ (15,790)
Development and Redevelopment [Member] | Benson Hotel & Faculty Club, The [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Aurora, CO
Initial Cost, Land	$ 1,815
Initial Cost, Buildings and Improvements	4,414
Total Initial Acquisition Costs	6,229
Costs Capitalized Subsequent to Consolidation	70,999
Land	1,503
Buildings and improvements	75,725
Total real estate	77,228
Accumulated Depreciation	$ (4,204)
Date Acquired	Jan. 31, 2021
Development and Redevelopment [Member] | One Edgewater [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Miami, FL
Initial Cost, Land	$ 20,045
Total Initial Acquisition Costs	20,045
Costs Capitalized Subsequent to Consolidation	4,633
Land	19,847
Buildings and improvements	4,831
Total real estate	$ 24,678
Date Acquired	Jul. 31, 2021
Development and Redevelopment [Member] | Hamilton House [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Miami, FL
Initial Cost, Land	$ 11,467
Total Initial Acquisition Costs	11,467
Costs Capitalized Subsequent to Consolidation	11,325
Land	11,467
Buildings and improvements	11,325
Total real estate	$ 22,792
Date Acquired	Jul. 31, 2021
Development and Redevelopment [Member] | Flying Horse [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Colorado Springs, CO
Initial Cost, Land	$ 4,257
Total Initial Acquisition Costs	4,257
Costs Capitalized Subsequent to Consolidation	3,818
Land	4,269
Buildings and improvements	3,806
Total real estate	$ 8,075
Date Acquired	Jul. 31, 2021
Development and Redevelopment [Member] | Hamilton, The [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Miami, FL
Encumbrances	$ 100,323
Initial Cost, Land	45,239
Initial Cost, Buildings and Improvements	34,891
Total Initial Acquisition Costs	80,130
Costs Capitalized Subsequent to Consolidation	114,338
Land	43,307
Buildings and improvements	151,161
Total real estate	194,468
Accumulated Depreciation	$ (10,637)
Date Acquired	Aug. 31, 2020
Development and Redevelopment [Member] | Oak Shore [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Corte Madera, CA
Encumbrances	$ 5,148
Costs Capitalized Subsequent to Consolidation	42,050
Buildings and improvements	42,050
Total real estate	42,050
Accumulated Depreciation	$ (39)
Date Acquired	Jun. 30, 2021
Development and Redevelopment [Member] | Upton Place [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Washington, DC
Encumbrances	$ 121,298
Initial Cost, Buildings and Improvements	21,280
Total Initial Acquisition Costs	21,280
Costs Capitalized Subsequent to Consolidation	258,881
Buildings and improvements	280,161
Total real estate	280,161
Accumulated Depreciation	$ (910)
Date Acquired	Dec. 31, 2020
Development and Redevelopment [Member] | 300 W. Broward Blvd. [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Ft. Lauderdale, FL
Initial Cost, Land	$ 21,355
Total Initial Acquisition Costs	21,355
Costs Capitalized Subsequent to Consolidation	14,814
Land	21,024
Buildings and improvements	15,145
Total real estate	$ 36,169
Date Acquired	Jan. 31, 2022
Development and Redevelopment [Member] | Fitzsimons Phase Four [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Aurora, CO
Initial Cost, Land	$ 2,016
Total Initial Acquisition Costs	2,016
Costs Capitalized Subsequent to Consolidation	1,187
Land	2,040
Buildings and improvements	1,163
Total real estate	$ 3,203
Date Acquired	Dec. 31, 2022
Development and Redevelopment [Member] | Sears Parcel 1 [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Ft. Lauderdale, FL
Initial Cost, Land	$ 68,485
Total Initial Acquisition Costs	68,485
Costs Capitalized Subsequent to Consolidation	14,932
Land	68,484
Buildings and improvements	14,933
Total real estate	$ 83,417
Date Acquired	Jun. 30, 2022
Development and Redevelopment [Member] | Sears Parcel 2 [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Ft. Lauderdale, FL
Initial Cost, Land	$ 20,737
Total Initial Acquisition Costs	20,737
Costs Capitalized Subsequent to Consolidation	2,519
Land	20,573
Buildings and improvements	2,683
Total real estate	$ 23,256
Date Acquired	Jul. 31, 2022
Development and Redevelopment [Member] | Sears Parcel 3 [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Ft. Lauderdale, FL
Initial Cost, Land	$ 16,402
Total Initial Acquisition Costs	16,402
Costs Capitalized Subsequent to Consolidation	1,485
Land	15,809
Buildings and improvements	2,078
Total real estate	$ 17,887
Date Acquired	Jun. 30, 2022
Development and Redevelopment [Member] | Bioscience 4 [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Aurora, CO
Costs Capitalized Subsequent to Consolidation	$ 4,173
Buildings and improvements	4,173
Total real estate	$ 4,173
Date Acquired	Feb. 28, 2023
Development and Redevelopment [Member] | Strathmore Phase 1 [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Washington, DC
Encumbrances	$ 74,673
Costs Capitalized Subsequent to Consolidation	110,646
Buildings and improvements	110,646
Total real estate	$ 110,646
Date Acquired	Feb. 28, 2022
Development and Redevelopment [Member] | Operating Segments [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Buildings and improvements	$ 719,880	447,101
Total real estate	928,203	658,918
Accumulated Depreciation	$ (15,793)	$ (2,378)
Other [Member] | St. George Villas [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	St. George, SC
Encumbrances	$ 203
Initial Cost, Land	108
Initial Cost, Buildings and Improvements	1,024
Total Initial Acquisition Costs	1,132
Costs Capitalized Subsequent to Consolidation	446
Land	71
Buildings and improvements	1,507
Total real estate	1,578
Accumulated Depreciation	$ (1,398)
Date Acquired	Jan. 31, 2006
Other [Member] | 1001 Brickell Bay Drive [Member] | Continuing Operations [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location	Miami, FL
Encumbrances	$ 81,300
Initial Cost, Land	150,018
Initial Cost, Buildings and Improvements	152,791
Total Initial Acquisition Costs	302,809
Costs Capitalized Subsequent to Consolidation	10,572
Land	150,018
Buildings and improvements	163,363
Total real estate	313,381
Accumulated Depreciation	$ (74,409)
Date Acquired	Jul. 31, 2019