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SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Encumbrances $ 0      
Accumulated Depreciation 490,697,000 $ 432,579,000 $ 376,131,000 $ 338,506,000
Aggregate cost for Federal Income Tax purposes 2,355,479      
Real Estate Excluding Assets Held For Sale        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land 192,072,000      
Initial cost of Buildings Improvements and Equipment 1,610,255,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 325,580,000      
Historical Cost of Land 191,578,000      
Historical Cost of Buildings Improvements and Equipment 1,936,329,000      
Total 2,127,907,000      
Accumulated Depreciation 490,697,000      
Total Costs, Net of Accumulated Depreciation 1,637,210,000      
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 446,000      
Historical Cost of Land 1,559,000      
Historical Cost of Buildings Improvements and Equipment 6,118,000      
Total 7,677,000      
Accumulated Depreciation 2,148,000      
Total Costs, Net of Accumulated Depreciation $ 5,529,000      
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      
Meadow Point, Chantilly, VA        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 2,634,000      
Initial cost of Buildings Improvements and Equipment 18,911,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 7,305,000      
Historical Cost of Land 2,634,000      
Historical Cost of Buildings Improvements and Equipment 26,216,000      
Total 28,850,000      
Accumulated Depreciation 13,555,000      
Total Costs, Net of Accumulated Depreciation $ 15,295,000      
Meadow Point, Chantilly, VA | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
Meadow Point, Chantilly, VA | Maximum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 39 years      
Timberlake, Chesterfield, MO        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 2,984,000      
Initial cost of Buildings Improvements and Equipment 38,661,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 9,919,000      
Historical Cost of Land 2,984,000      
Historical Cost of Buildings Improvements and Equipment 48,580,000      
Total 51,564,000      
Accumulated Depreciation 21,437,000      
Total Costs, Net of Accumulated Depreciation $ 30,127,000      
Timberlake, Chesterfield, MO | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
Timberlake, Chesterfield, MO | 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 12,304,000      
Historical Cost of Land 2,914,000      
Historical Cost of Buildings Improvements and Equipment 38,599,000      
Total 41,513,000      
Accumulated Depreciation 18,391,000      
Total Costs, Net of Accumulated Depreciation $ 23,122,000      
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      
Timberlake East, Chesterfield, MO        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 2,626,000      
Initial cost of Buildings Improvements and Equipment 17,608,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 4,768,000      
Historical Cost of Land 2,626,000      
Historical Cost of Buildings Improvements and Equipment 22,376,000      
Total 25,002,000      
Accumulated Depreciation 10,037,000      
Total Costs, Net of Accumulated Depreciation $ 14,965,000      
Timberlake East, Chesterfield, MO | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
Timberlake East, Chesterfield, MO | 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 5,922,000      
Historical Cost of Land 567,000      
Historical Cost of Buildings Improvements and Equipment 27,719,000      
Total 28,286,000      
Accumulated Depreciation 12,237,000      
Total Costs, Net of Accumulated Depreciation $ 16,049,000      
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 11,067,000      
Historical Cost of Land 4,325,000      
Historical Cost of Buildings Improvements and Equipment 59,107,000      
Total 63,432,000      
Accumulated Depreciation 21,258,000      
Total Costs, Net of Accumulated Depreciation $ 42,174,000      
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 7,508,000      
Historical Cost of Land 4,000,000      
Historical Cost of Buildings Improvements and Equipment 50,106,000      
Total 54,106,000      
Accumulated Depreciation 21,876,000      
Total Costs, Net of Accumulated Depreciation $ 32,230,000      
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 11,157,000      
Historical Cost of Land 3,100,000      
Historical Cost of Buildings Improvements and Equipment 41,358,000      
Total 44,458,000      
Accumulated Depreciation 17,024,000      
Total Costs, Net of Accumulated Depreciation $ 27,434,000      
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      
River Crossing, Indianapolis, IN        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 3,000,000      
Initial cost of Buildings Improvements and Equipment 36,926,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 4,521,000      
Historical Cost of Land 3,000,000      
Historical Cost of Buildings Improvements and Equipment 41,447,000      
Total 44,447,000      
Accumulated Depreciation 15,733,000      
Total Costs, Net of Accumulated Depreciation $ 28,714,000      
River Crossing, Indianapolis, IN | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
River Crossing, Indianapolis, IN | 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 5,958,000      
Historical Cost of Land 5,000,000      
Historical Cost of Buildings Improvements and Equipment 46,174,000      
Total 51,174,000      
Accumulated Depreciation 17,850,000      
Total Costs, Net of Accumulated Depreciation $ 33,324,000      
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      
380 Interlocken, Bloomfield, CO        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 8,275,000      
Initial cost of Buildings Improvements and Equipment 34,462,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 9,919,000      
Historical Cost of Land 8,275,000      
Historical Cost of Buildings Improvements and Equipment 44,381,000      
Total 52,656,000      
Accumulated Depreciation 18,186,000      
Total Costs, Net of Accumulated Depreciation $ 34,470,000      
380 Interlocken, Bloomfield, CO | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
380 Interlocken, Bloomfield, CO | 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 6,373,000      
Historical Cost of Land 6,306,000      
Historical Cost of Buildings Improvements and Equipment 52,497,000      
Total 58,803,000      
Accumulated Depreciation 14,998,000      
Total Costs, Net of Accumulated Depreciation $ 43,805,000      
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 4,536,000      
Historical Cost of Land 3,900,000      
Historical Cost of Buildings Improvements and Equipment 48,327,000      
Total 52,227,000      
Accumulated Depreciation 18,372,000      
Total Costs, Net of Accumulated Depreciation $ 33,855,000      
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 8,307,000      
Historical Cost of Land 4,374,000      
Historical Cost of Buildings Improvements and Equipment 29,453,000      
Total 33,827,000      
Accumulated Depreciation 11,112,000      
Total Costs, Net of Accumulated Depreciation $ 22,715,000      
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      
One Overton, Atlanta, GA        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 3,900,000      
Initial cost of Buildings Improvements and Equipment 77,229,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 15,453,000      
Historical Cost of Land 3,900,000      
Historical Cost of Buildings Improvements and Equipment 92,682,000      
Total 96,582,000      
Accumulated Depreciation 33,767,000      
Total Costs, Net of Accumulated Depreciation $ 62,815,000      
One Overton, Atlanta, GA | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
One Overton, Atlanta, GA | Maximum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 39 years      
FSP 390 Interlocken, Broomfield, CO        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 7,013,000      
Initial cost of Buildings Improvements and Equipment 37,751,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 14,063,000      
Historical Cost of Land 7,013,000      
Historical Cost of Buildings Improvements and Equipment 51,814,000      
Total 58,827,000      
Accumulated Depreciation 16,370,000      
Total Costs, Net of Accumulated Depreciation $ 42,457,000      
FSP 390 Interlocken, Broomfield, CO | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
FSP 390 Interlocken, Broomfield, CO | 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 6,616,000      
Historical Cost of Land 1,300,000      
Historical Cost of Buildings Improvements and Equipment 38,328,000      
Total 39,628,000      
Accumulated Depreciation 10,147,000      
Total Costs, Net of Accumulated Depreciation $ 29,481,000      
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      
Dulles Virginia, Sterling, VA        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 4,813,000      
Initial cost of Buildings Improvements and Equipment 13,285,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 6,082,000      
Historical Cost of Land 4,813,000      
Historical Cost of Buildings Improvements and Equipment 19,367,000      
Total 24,180,000      
Accumulated Depreciation 6,384,000      
Total Costs, Net of Accumulated Depreciation $ 17,796,000      
Dulles Virginia, Sterling, VA | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
Dulles Virginia, Sterling, VA | Maximum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 39 years      
Stonecroft, Chantilly, VA        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 2,102,000      
Initial cost of Buildings Improvements and Equipment 18,003,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 63,000      
Historical Cost of Land 2,102,000      
Historical Cost of Buildings Improvements and Equipment 18,066,000      
Total 20,168,000      
Accumulated Depreciation 4,847,000      
Total Costs, Net of Accumulated Depreciation $ 15,321,000      
Stonecroft, Chantilly, VA | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
Stonecroft, Chantilly, VA | 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 22,793,000      
Historical Cost of Land 4,444,000      
Historical Cost of Buildings Improvements and Equipment 38,007,000      
Total 42,451,000      
Accumulated Depreciation 8,952,000      
Total Costs, Net of Accumulated Depreciation $ 33,499,000      
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 22,190,000      
Historical Cost of Land 4,184,000      
Historical Cost of Buildings Improvements and Equipment 22,190,000      
Total 26,374,000      
Accumulated Depreciation 904,000      
Total Costs, Net of Accumulated Depreciation $ 25,470,000      
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      
909 Davis, Evanston, IL        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 4,912,000      
Initial cost of Buildings Improvements and Equipment 18,229,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 7,298,000      
Historical Cost of Land 4,912,000      
Historical Cost of Buildings Improvements and Equipment 25,527,000      
Total 30,439,000      
Accumulated Depreciation 5,832,000      
Total Costs, Net of Accumulated Depreciation $ 24,607,000      
909 Davis, Evanston, IL | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
909 Davis, Evanston, IL | Maximum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 39 years      
Emperor Boulevard, Durham, NC        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 2,423,000      
Initial cost of Buildings Improvements and Equipment 53,997,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 1,052,000      
Historical Cost of Land 2,423,000      
Historical Cost of Buildings Improvements and Equipment 55,049,000      
Total 57,472,000      
Accumulated Depreciation 12,346,000      
Total Costs, Net of Accumulated Depreciation $ 45,126,000      
Emperor Boulevard, Durham, NC | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
Emperor Boulevard, Durham, NC | 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 2,518,000      
Historical Cost of Land 3,067,000      
Historical Cost of Buildings Improvements and Equipment 24,582,000      
Total 27,649,000      
Accumulated Depreciation 5,519,000      
Total Costs, Net of Accumulated Depreciation $ 22,130,000      
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 2,678,000      
Historical Cost of Land 2,590,000      
Historical Cost of Buildings Improvements and Equipment 39,286,000      
Total 41,876,000      
Accumulated Depreciation 9,895,000      
Total Costs, Net of Accumulated Depreciation $ 31,981,000      
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      
One Ravinia Drive, Atlanta, GA        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 2,686,000      
Initial cost of Buildings Improvements and Equipment 35,125,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 9,557,000      
Historical Cost of Land 2,686,000      
Historical Cost of Buildings Improvements and Equipment 44,682,000      
Total 47,368,000      
Accumulated Depreciation 9,142,000      
Total Costs, Net of Accumulated Depreciation $ 38,226,000      
One Ravinia Drive, Atlanta, GA | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
One Ravinia Drive, Atlanta, GA | Maximum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 39 years      
Two Ravinia Drive, Atlanta, GA        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 7,375,000      
Initial cost of Buildings Improvements and Equipment 58,726,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 10,641,000      
Historical Cost of Land 7,375,000      
Historical Cost of Buildings Improvements and Equipment 69,367,000      
Total 76,742,000      
Accumulated Depreciation 9,113,000      
Total Costs, Net of Accumulated Depreciation $ 67,629,000      
Two Ravinia Drive, Atlanta, GA | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
Two Ravinia Drive, Atlanta, GA | 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 12,303,000      
Historical Cost of Land 8,491,000      
Historical Cost of Buildings Improvements and Equipment 133,811,000      
Total 142,302,000      
Accumulated Depreciation 25,745,000      
Total Costs, Net of Accumulated Depreciation $ 116,557,000      
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 30,899,000      
Historical Cost of Land 16,334,000      
Historical Cost of Buildings Improvements and Equipment 168,625,000      
Total 184,959,000      
Accumulated Depreciation 28,194,000      
Total Costs, Net of Accumulated Depreciation $ 156,765,000      
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      
999 Peachtree, Atlanta, GA        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Initial cost of Land $ 10,187,000      
Initial cost of Buildings Improvements and Equipment 107,727,000      
Costs Capitalized (Disposals) Subsequent to Acquisition 17,689,000      
Historical Cost of Land 10,187,000      
Historical Cost of Buildings Improvements and Equipment 125,416,000      
Total 135,603,000      
Accumulated Depreciation 20,935,000      
Total Costs, Net of Accumulated Depreciation $ 114,668,000      
999 Peachtree, Atlanta, GA | Minimum        
REAL ESTATE AND ACCUMULATED DEPRECIATION        
Depreciable Life Years 5 years      
999 Peachtree, Atlanta, GA | 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 18,084,000      
Historical Cost of Land 17,413,000      
Historical Cost of Buildings Improvements and Equipment 183,142,000      
Total 200,555,000      
Accumulated Depreciation 29,608,000      
Total Costs, Net of Accumulated Depreciation $ 170,947,000      
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 7,787,000      
Historical Cost of Land 6,604,000      
Historical Cost of Buildings Improvements and Equipment 62,027,000      
Total 68,631,000      
Accumulated Depreciation 6,962,000      
Total Costs, Net of Accumulated Depreciation $ 61,669,000      
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 1,417,000      
Historical Cost of Land 5,300,000      
Historical Cost of Buildings Improvements and Equipment 35,575,000      
Total 40,875,000      
Accumulated Depreciation 3,117,000      
Total Costs, Net of Accumulated Depreciation $ 37,758,000      
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 6,387,000      
Historical Cost of Land 20,876,000      
Historical Cost of Buildings Improvements and Equipment 106,328,000      
Total 127,204,000      
Accumulated Depreciation 8,704,000      
Total Costs, Net of Accumulated Depreciation $ 118,500,000      
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