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SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION (Details) - USD ($)
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Encumbrances $ 0      
Accumulated Depreciation 377,708,000 $ 366,349,000 $ 423,417,000 $ 424,487,000
Aggregate cost for Federal Income Tax purposes 1,360,898      
Real Estate Excluding Assets Held For Sale        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land 105,889,000      
Initial cost of Buildings Improvements and Equipment 825,223,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 281,504,000      
Historical Cost of Land 105,298,000      
Historical Cost of Buildings Improvements and Equipment 1,107,318,000      
Total 1,212,616,000      
Accumulated Depreciation 377,708,000      
Total Costs, Net of Accumulated Depreciation 834,908,000      
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 8,150,000      
Historical Cost of Land 565,000      
Historical Cost of Buildings Improvements and Equipment 29,949,000      
Total 30,514,000      
Accumulated Depreciation 15,549,000      
Total Costs, Net of Accumulated Depreciation $ 14,965,000      
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 14,489,000      
Historical Cost of Land 4,325,000      
Historical Cost of Buildings Improvements and Equipment 62,529,000      
Total 66,854,000      
Accumulated Depreciation 32,544,000      
Total Costs, Net of Accumulated Depreciation $ 34,310,000      
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      
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 13,165,000      
Historical Cost of Land 3,100,000      
Historical Cost of Buildings Improvements and Equipment 43,366,000      
Total 46,466,000      
Accumulated Depreciation 21,140,000      
Total Costs, Net of Accumulated Depreciation $ 25,326,000      
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      
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 12,423,000      
Historical Cost of Land 3,900,000      
Historical Cost of Buildings Improvements and Equipment 56,214,000      
Total 60,114,000      
Accumulated Depreciation 25,615,000      
Total Costs, Net of Accumulated Depreciation $ 34,499,000      
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 12,958,000      
Historical Cost of Land 4,279,000      
Historical Cost of Buildings Improvements and Equipment 34,199,000      
Total 38,478,000      
Accumulated Depreciation 16,245,000      
Total Costs, Net of Accumulated Depreciation $ 22,233,000      
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 7,261,000      
Historical Cost of Land 1,300,000      
Historical Cost of Buildings Improvements and Equipment 38,973,000      
Total 40,273,000      
Accumulated Depreciation 18,421,000      
Total Costs, Net of Accumulated Depreciation $ 21,852,000      
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 29,762,000      
Historical Cost of Land 4,444,000      
Historical Cost of Buildings Improvements and Equipment 44,976,000      
Total 49,420,000      
Accumulated Depreciation 17,736,000      
Total Costs, Net of Accumulated Depreciation $ 31,684,000      
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 28,318,000      
Historical Cost of Land 4,184,000      
Historical Cost of Buildings Improvements and Equipment 28,318,000      
Total 32,502,000      
Accumulated Depreciation 8,087,000      
Total Costs, Net of Accumulated Depreciation $ 24,415,000      
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 7,115,000      
Historical Cost of Land 3,067,000      
Historical Cost of Buildings Improvements and Equipment 29,179,000      
Total 32,246,000      
Accumulated Depreciation 10,138,000      
Total Costs, Net of Accumulated Depreciation $ 22,108,000      
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      
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 26,557,000      
Historical Cost of Land 8,491,000      
Historical Cost of Buildings Improvements and Equipment 148,065,000      
Total 156,556,000      
Accumulated Depreciation 46,948,000      
Total Costs, Net of Accumulated Depreciation $ 109,608,000      
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, Denver, 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 44,326,000      
Historical Cost of Land 16,334,000      
Historical Cost of Buildings Improvements and Equipment 182,052,000      
Total 198,386,000      
Accumulated Depreciation 58,083,000      
Total Costs, Net of Accumulated Depreciation $ 140,303,000      
1999 Broadway, Denver, CO | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
1999 Broadway, Denver, CO | Maximum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 39 years      
1001 17th Street, Denver, 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 42,904,000      
Historical Cost of Land 17,413,000      
Historical Cost of Buildings Improvements and Equipment 207,962,000      
Total 225,375,000      
Accumulated Depreciation 60,394,000      
Total Costs, Net of Accumulated Depreciation $ 164,981,000      
1001 17th Street, Denver, CO | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
1001 17th Street, Denver, 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 15,228,000      
Historical Cost of Land 6,604,000      
Historical Cost of Buildings Improvements and Equipment 69,468,000      
Total 76,072,000      
Accumulated Depreciation 18,814,000      
Total Costs, Net of Accumulated Depreciation $ 57,258,000      
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      
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 18,848,000      
Historical Cost of Land 20,876,000      
Historical Cost of Buildings Improvements and Equipment 118,789,000      
Total 139,665,000      
Accumulated Depreciation 27,312,000      
Total Costs, Net of Accumulated Depreciation $ 112,353,000      
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      
Monument Circle, Indianapolis, IN        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 6,416,000      
Initial cost of Buildings Improvements and Equipment 13,279,000      
Historical Cost of Land 6,416,000      
Historical Cost of Buildings Improvements and Equipment 13,279,000      
Total 19,695,000      
Accumulated Depreciation 682,000      
Total Costs, Net of Accumulated Depreciation $ 19,013,000      
Monument Circle, Indianapolis, IN | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
Monument Circle, Indianapolis, IN | Maximum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 39 years