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SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Encumbrances $ 0      
Accumulated Depreciation 423,417,000 $ 424,487,000 $ 538,717,000 $ 490,697,000
Aggregate cost for Federal Income Tax purposes 1,686,597      
Real Estate Excluding Assets Held For Sale        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land 127,142,000      
Initial cost of Buildings Improvements and Equipment 1,043,615,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 355,908,000      
Historical Cost of Land 126,645,000      
Historical Cost of Buildings Improvements and Equipment 1,400,020,000      
Total 1,526,665,000      
Accumulated Depreciation 423,417,000      
Total Costs, Net of Accumulated Depreciation 1,103,248,000      
Forest Park, Charlotte, NC        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land 1,559,000      
Initial cost of Buildings Improvements and Equipment 5,672,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 4,507,000      
Historical Cost of Land 1,559,000      
Historical Cost of Buildings Improvements and Equipment 10,179,000      
Total 11,738,000      
Accumulated Depreciation 3,079,000      
Total Costs, Net of Accumulated Depreciation $ 8,659,000      
Forest Park, Charlotte, NC | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
Forest Park, Charlotte, NC | Maximum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 39 years      
Northwest Point, Elk Grove Village, IL        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 2,914,000      
Initial cost of Buildings Improvements and Equipment 26,295,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 14,275,000      
Historical Cost of Land 2,914,000      
Historical Cost of Buildings Improvements and Equipment 40,570,000      
Total 43,484,000      
Accumulated Depreciation 21,776,000      
Total Costs, Net of Accumulated Depreciation $ 21,708,000      
Northwest Point, Elk Grove Village, IL | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
Northwest Point, Elk Grove Village, IL | Maximum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 39 years      
Park Ten, Houston, TX        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 1,061,000      
Initial cost of Buildings Improvements and Equipment 21,303,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 7,090,000      
Historical Cost of Land 565,000      
Historical Cost of Buildings Improvements and Equipment 28,889,000      
Total 29,454,000      
Accumulated Depreciation 15,189,000      
Total Costs, Net of Accumulated Depreciation $ 14,265,000      
Park Ten, Houston, TX | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
Park Ten, Houston, TX | Maximum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 39 years      
Addison, Addison, TX        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 4,325,000      
Initial cost of Buildings Improvements and Equipment 48,040,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 13,447,000      
Historical Cost of Land 4,325,000      
Historical Cost of Buildings Improvements and Equipment 61,487,000      
Total 65,812,000      
Accumulated Depreciation 27,669,000      
Total Costs, Net of Accumulated Depreciation $ 38,143,000      
Addison, Addison, TX | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
Addison, Addison, TX | Maximum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 39 years      
Collins, Richardson, TX        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 4,000,000      
Initial cost of Buildings Improvements and Equipment 42,598,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 9,419,000      
Historical Cost of Land 4,000,000      
Historical Cost of Buildings Improvements and Equipment 52,017,000      
Total 56,017,000      
Accumulated Depreciation 26,137,000      
Total Costs, Net of Accumulated Depreciation $ 29,880,000      
Collins, Richardson, TX | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
Collins, Richardson, TX | Maximum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 39 years      
Greenwood, Englewood, CO        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 3,100,000      
Initial cost of Buildings Improvements and Equipment 30,201,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 13,933,000      
Historical Cost of Land 3,100,000      
Historical Cost of Buildings Improvements and Equipment 44,134,000      
Total 47,234,000      
Accumulated Depreciation 21,700,000      
Total Costs, Net of Accumulated Depreciation $ 25,534,000      
Greenwood, Englewood, CO | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
Greenwood, Englewood, CO | Maximum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 39 years      
Innsbrook, Glenn Allen, VA        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 5,000,000      
Initial cost of Buildings Improvements and Equipment 40,216,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 9,002,000      
Historical Cost of Land 5,000,000      
Historical Cost of Buildings Improvements and Equipment 49,218,000      
Total 54,218,000      
Accumulated Depreciation 21,900,000      
Total Costs, Net of Accumulated Depreciation $ 32,318,000      
Innsbrook, Glenn Allen, VA | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
Innsbrook, Glenn Allen, VA | Maximum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 39 years      
Blue Lagoon, Miami, FL        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 6,306,000      
Initial cost of Buildings Improvements and Equipment 46,124,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 38,152,000      
Historical Cost of Land 6,306,000      
Historical Cost of Buildings Improvements and Equipment 84,276,000      
Total 90,582,000      
Accumulated Depreciation 19,649,000      
Total Costs, Net of Accumulated Depreciation $ 70,933,000      
Blue Lagoon, Miami, FL | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
Blue Lagoon, Miami, FL | Maximum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 39 years      
Eldridge Green, Houston, TX        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 3,900,000      
Initial cost of Buildings Improvements and Equipment 43,791,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 9,063,000      
Historical Cost of Land 3,900,000      
Historical Cost of Buildings Improvements and Equipment 52,854,000      
Total 56,754,000      
Accumulated Depreciation 22,346,000      
Total Costs, Net of Accumulated Depreciation $ 34,408,000      
Eldridge Green, Houston, TX | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
Eldridge Green, Houston, TX | Maximum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 39 years      
Liberty Plaza, Addison, TX        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 4,374,000      
Initial cost of Buildings Improvements and Equipment 21,146,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 11,334,000      
Historical Cost of Land 4,373,000      
Historical Cost of Buildings Improvements and Equipment 32,481,000      
Total 36,854,000      
Accumulated Depreciation 14,106,000      
Total Costs, Net of Accumulated Depreciation $ 22,748,000      
Liberty Plaza, Addison, TX | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
Liberty Plaza, Addison, TX | Maximum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 39 years      
Park Ten II, Houston, TX        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 1,300,000      
Initial cost of Buildings Improvements and Equipment 31,712,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 7,258,000      
Historical Cost of Land 1,300,000      
Historical Cost of Buildings Improvements and Equipment 38,970,000      
Total 40,270,000      
Accumulated Depreciation 15,165,000      
Total Costs, Net of Accumulated Depreciation $ 25,105,000      
Park Ten II, Houston, TX | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
Park Ten II, Houston, TX | Maximum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 39 years      
121 South Eight Street, Minneapolis, MN        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 4,444,000      
Initial cost of Buildings Improvements and Equipment 15,214,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 30,549,000      
Historical Cost of Land 4,444,000      
Historical Cost of Buildings Improvements and Equipment 45,763,000      
Total 50,207,000      
Accumulated Depreciation 15,084,000      
Total Costs, Net of Accumulated Depreciation $ 35,123,000      
121 South Eight Street, Minneapolis, MN | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
121 South Eight Street, Minneapolis, MN | Maximum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 39 years      
801 Marquette Avenue South, Minneapolis, MN        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 4,184,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 28,093,000      
Historical Cost of Land 4,184,000      
Historical Cost of Buildings Improvements and Equipment 28,093,000      
Total 32,277,000      
Accumulated Depreciation 6,174,000      
Total Costs, Net of Accumulated Depreciation $ 26,103,000      
801 Marquette Avenue South, Minneapolis, MN | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
801 Marquette Avenue South, Minneapolis, MN | Maximum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 39 years      
Legacy Tennyson Center, Plano, TX        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 3,067,000      
Initial cost of Buildings Improvements and Equipment 22,064,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 4,656,000      
Historical Cost of Land 3,067,000      
Historical Cost of Buildings Improvements and Equipment 26,720,000      
Total 29,787,000      
Accumulated Depreciation 8,698,000      
Total Costs, Net of Accumulated Depreciation $ 21,089,000      
Legacy Tennyson Center, Plano, TX | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
Legacy Tennyson Center, Plano, TX | Maximum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 39 years      
One Legacy Circle, Plano, TX        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 2,590,000      
Initial cost of Buildings Improvements and Equipment 36,608,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 5,754,000      
Historical Cost of Land 2,590,000      
Historical Cost of Buildings Improvements and Equipment 42,362,000      
Total 44,952,000      
Accumulated Depreciation 13,136,000      
Total Costs, Net of Accumulated Depreciation $ 31,816,000      
One Legacy Circle, Plano, TX | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
One Legacy Circle, Plano, TX | Maximum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 39 years      
Westchase I & II, Houston, TX        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 8,491,000      
Initial cost of Buildings Improvements and Equipment 121,508,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 23,348,000      
Historical Cost of Land 8,491,000      
Historical Cost of Buildings Improvements and Equipment 144,856,000      
Total 153,347,000      
Accumulated Depreciation 38,361,000      
Total Costs, Net of Accumulated Depreciation $ 114,986,000      
Westchase I & II, Houston, TX | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
Westchase I & II, Houston, TX | Maximum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 39 years      
1999 Broadway, CO        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 16,334,000      
Initial cost of Buildings Improvements and Equipment 137,726,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 40,531,000      
Historical Cost of Land 16,334,000      
Historical Cost of Buildings Improvements and Equipment 178,257,000      
Total 194,591,000      
Accumulated Depreciation 46,371,000      
Total Costs, Net of Accumulated Depreciation $ 148,220,000      
1999 Broadway, CO | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
1999 Broadway, CO | Maximum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 39 years      
1001 17th Street, CO        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 17,413,000      
Initial cost of Buildings Improvements and Equipment 165,058,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 34,429,000      
Historical Cost of Land 17,413,000      
Historical Cost of Buildings Improvements and Equipment 199,487,000      
Total 216,900,000      
Accumulated Depreciation 47,256,000      
Total Costs, Net of Accumulated Depreciation $ 169,644,000      
1001 17th Street, CO | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
1001 17th Street, CO | Maximum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 39 years      
Plaza Seven, Minneapolis, MN        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 6,604,000      
Initial cost of Buildings Improvements and Equipment 54,240,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 13,795,000      
Historical Cost of Land 6,604,000      
Historical Cost of Buildings Improvements and Equipment 68,035,000      
Total 74,639,000      
Accumulated Depreciation 13,772,000      
Total Costs, Net of Accumulated Depreciation $ 60,867,000      
Plaza Seven, Minneapolis, MN | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
Plaza Seven, Minneapolis, MN | Maximum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 39 years      
Pershing Plaza, Atlanta, GA        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 5,300,000      
Initial cost of Buildings Improvements and Equipment 34,158,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 20,336,000      
Historical Cost of Land 5,300,000      
Historical Cost of Buildings Improvements and Equipment 54,494,000      
Total 59,794,000      
Accumulated Depreciation 6,424,000      
Total Costs, Net of Accumulated Depreciation $ 53,370,000      
Pershing Plaza, Atlanta, GA | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
Pershing Plaza, Atlanta, GA | Maximum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 39 years      
600 17th Street, Denver, Co        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 20,876,000      
Initial cost of Buildings Improvements and Equipment 99,941,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 16,937,000      
Historical Cost of Land 20,876,000      
Historical Cost of Buildings Improvements and Equipment 116,878,000      
Total 137,754,000      
Accumulated Depreciation 19,425,000      
Total Costs, Net of Accumulated Depreciation $ 118,329,000      
600 17th Street, Denver, Co | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
600 17th Street, Denver, Co | Maximum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 39 years