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Schedule III (Real Estate and Accumulated Depreciation and Amortization) (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances |  | $ 151,142,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land |  | 37,917,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements |  | 202,335,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total |  | 240,252,000 |  |  |
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements |  | 32,369,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land |  | 37,951,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements |  | 186,389,000 |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 256,709,000 |  |  |
Real Estate Accumulated Depreciation & Depreciation |  | 43,567,809 | [1] | $ 40,012,255 | $ 36,311,485
Mortgage Loans on Real Estate, Write-down or Reserve, Amount |  | 2,033,000 |  |  |
SEC Schedule III, Real Estate Investment Property, Net, Total |  | 211,108,000 |  |  |
Office/Industrial Properties [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances |  | 101,388,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land |  | 23,622,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements |  | 136,996,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total |  | 160,618,000 |  |  |
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements |  | 29,825,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land |  | 23,622,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements |  | 122,147,000 |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 175,594,000 |  |  |
Real Estate Accumulated Depreciation & Depreciation | [1] | 36,399,000 |  |  |
Mortgage Loans on Real Estate, Write-down or Reserve, Amount |  | 500,000 |  |  |
SEC Schedule III, Real Estate Investment Property, Net, Total |  | 138,695,000 |  |  |
Office/Industrial Properties [Member] | Garden Gateway Plaza [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances |  | 6,271,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land |  | 3,035,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements |  | 12,091,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total |  | 15,126,000 |  |  |
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements |  | 2,721,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land |  | 3,035,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements |  | 10,833,000 |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 16,589,000 |  |  |
Real Estate Accumulated Depreciation & Depreciation | [1] | 5,423,000 |  |  |
SEC Schedule III, Real Estate Investment Property, Net, Total |  | $ 11,166,000 |  |  |
Real Estate And Accumulated Depreciation Date Acquired |  | 03/07 |  |  |
Office/Industrial Properties [Member] | Garden Gateway Plaza [Member] | Minimum [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate And Accumulated Depreciation Year Built Or Renovated |  | 1982 |  |  |
Office/Industrial Properties [Member] | Garden Gateway Plaza [Member] | Maximum [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate And Accumulated Depreciation Year Built Or Renovated |  | 2006 |  |  |
Office/Industrial Properties [Member] | Executive Office Park [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances |  | $ 4,948,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land |  | 1,266,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements |  | 8,815,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total |  | 10,081,000 |  |  |
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements |  | 1,490,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land |  | 1,266,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements |  | 7,880,000 |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 10,636,000 |  |  |
Real Estate Accumulated Depreciation & Depreciation | [1] | 2,660,000 |  |  |
SEC Schedule III, Real Estate Investment Property, Net, Total |  | $ 7,976,000 |  |  |
Real Estate And Accumulated Depreciation Date Acquired |  | 07/08 |  |  |
Real Estate And Accumulated Depreciation Year Built Or Renovated |  | 2000 |  |  |
Office/Industrial Properties [Member] | Morena Office Center [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | [2] | $ 1,567,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land | [2] | 1,333,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | [2] | 5,203,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total | [2] | 6,536,000 |  |  |
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements | [2] | 787,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land | [2] | 1,333,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements | [2] | 5,037,000 |  |  |
SEC Schedule III, Real Estate, Gross, Total | [2] | 7,157,000 |  |  |
Real Estate Accumulated Depreciation & Depreciation | [1],[2] | 1,941,000 |  |  |
Mortgage Loans on Real Estate, Write-down or Reserve, Amount | [2] | 500,000 |  |  |
SEC Schedule III, Real Estate Investment Property, Net, Total | [2] | $ 4,716,000 |  |  |
Real Estate And Accumulated Depreciation Date Acquired | [2] | 01/09 |  |  |
Real Estate And Accumulated Depreciation Year Built Or Renovated | [2] | 1985 |  |  |
Office/Industrial Properties [Member] | Genesis Plaza [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances |  | $ 6,476,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land |  | 1,400,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements |  | 8,600,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total |  | 10,000,000 |  |  |
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements |  | 1,712,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land |  | 1,400,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements |  | 8,007,000 |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 11,119,000 |  |  |
Real Estate Accumulated Depreciation & Depreciation | [1] | 2,670,000 |  |  |
SEC Schedule III, Real Estate Investment Property, Net, Total |  | $ 8,449,000 |  |  |
Real Estate And Accumulated Depreciation Date Acquired |  | 08/10 |  |  |
Real Estate And Accumulated Depreciation Year Built Or Renovated |  | 1989 |  |  |
Office/Industrial Properties [Member] | Dakota Center [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances |  | $ 10,315,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land |  | 832,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements |  | 8,743,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total |  | 9,575,000 |  |  |
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements |  | 1,267,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land |  | 832,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements |  | 9,823,000 |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 11,922,000 |  |  |
Real Estate Accumulated Depreciation & Depreciation | [1] | 2,783,000 |  |  |
SEC Schedule III, Real Estate Investment Property, Net, Total |  | $ 9,139,000 |  |  |
Real Estate And Accumulated Depreciation Date Acquired |  | 05/11 |  |  |
Real Estate And Accumulated Depreciation Year Built Or Renovated |  | 1982 |  |  |
Office/Industrial Properties [Member] | The Presidio [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances |  | $ 5,993,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land |  | 1,325,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements |  | 5,950,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total |  | 7,275,000 |  |  |
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements |  | 1,962,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land |  | 1,325,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements |  | 5,320,000 |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 8,607,000 |  |  |
Real Estate Accumulated Depreciation & Depreciation | [1] | 2,108,000 |  |  |
SEC Schedule III, Real Estate Investment Property, Net, Total |  | $ 6,499,000 |  |  |
Real Estate And Accumulated Depreciation Date Acquired |  | 11/12 |  |  |
Real Estate And Accumulated Depreciation Year Built Or Renovated |  | 1985 |  |  |
Office/Industrial Properties [Member] | Grand Pacific Center [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances |  | $ 3,961,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land |  | 413,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements |  | 4,926,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total |  | 5,339,000 |  |  |
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements |  | 714,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land |  | 413,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements |  | 5,921,000 |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 7,048,000 |  |  |
Real Estate Accumulated Depreciation & Depreciation | [1] | 1,234,000 |  |  |
SEC Schedule III, Real Estate Investment Property, Net, Total |  | $ 5,814,000 |  |  |
Real Estate And Accumulated Depreciation Date Acquired |  | 03/14 |  |  |
Real Estate And Accumulated Depreciation Year Built Or Renovated |  | 1976 |  |  |
Office/Industrial Properties [Member] | Union Terrace [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances |  | $ 6,354,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land |  | 1,717,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements |  | 7,708,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total |  | 9,425,000 |  |  |
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements |  | 3,246,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land |  | 1,717,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements |  | 5,749,000 |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 10,712,000 |  |  |
Real Estate Accumulated Depreciation & Depreciation | [1] | 2,729,000 |  |  |
SEC Schedule III, Real Estate Investment Property, Net, Total |  | $ 7,983,000 |  |  |
Real Estate And Accumulated Depreciation Date Acquired |  | 08/14 |  |  |
Real Estate And Accumulated Depreciation Year Built Or Renovated |  | 1982 |  |  |
Office/Industrial Properties [Member] | Centennial Tech Center [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances |  | $ 9,746,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land |  | 2,025,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements |  | 13,475,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total |  | 15,500,000 |  |  |
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements |  | 3,250,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land |  | 2,025,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements |  | 10,545,000 |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 15,820,000 |  |  |
Real Estate Accumulated Depreciation & Depreciation | [1] | 2,860,000 |  |  |
SEC Schedule III, Real Estate Investment Property, Net, Total |  | $ 12,960,000 |  |  |
Real Estate And Accumulated Depreciation Date Acquired |  | 12/14 |  |  |
Real Estate And Accumulated Depreciation Year Built Or Renovated |  | 1999 |  |  |
Office/Industrial Properties [Member] | Arapahoe Center [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances |  | $ 8,234,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land |  | 1,420,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements |  | 10,430,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total |  | 11,850,000 |  |  |
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements |  | 2,076,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land |  | 1,420,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements |  | 8,844,000 |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 12,340,000 |  |  |
Real Estate Accumulated Depreciation & Depreciation | [1] | 2,089,000 |  |  |
SEC Schedule III, Real Estate Investment Property, Net, Total |  | $ 10,251,000 |  |  |
Real Estate And Accumulated Depreciation Date Acquired |  | 12/14 |  |  |
Real Estate And Accumulated Depreciation Year Built Or Renovated |  | 2000 |  |  |
Office/Industrial Properties [Member] | West Fargo Industrial [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances |  | $ 4,293,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land |  | 1,693,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements |  | 6,207,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total |  | 7,900,000 |  |  |
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements |  | 352,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land |  | 1,693,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements |  | 6,052,000 |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 8,097,000 |  |  |
Real Estate Accumulated Depreciation & Depreciation | [1] | 854,000 |  |  |
SEC Schedule III, Real Estate Investment Property, Net, Total |  | $ 7,243,000 |  |  |
Real Estate And Accumulated Depreciation Date Acquired |  | 08/15 |  |  |
Office/Industrial Properties [Member] | West Fargo Industrial [Member] | Minimum [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate And Accumulated Depreciation Year Built Or Renovated |  | 1998 |  |  |
Office/Industrial Properties [Member] | West Fargo Industrial [Member] | Maximum [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate And Accumulated Depreciation Year Built Or Renovated |  | 2005 |  |  |
Office/Industrial Properties [Member] | 300 N.P. [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances |  | $ 2,348,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land |  | 135,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements |  | 3,715,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total |  | 3,850,000 |  |  |
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements |  | 317,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land |  | 135,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements |  | 3,589,000 |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 4,041,000 |  |  |
Real Estate Accumulated Depreciation & Depreciation | [1] | 498,000 |  |  |
SEC Schedule III, Real Estate Investment Property, Net, Total |  | $ 3,543,000 |  |  |
Real Estate And Accumulated Depreciation Date Acquired |  | 08/15 |  |  |
Real Estate And Accumulated Depreciation Year Built Or Renovated |  | 1922 |  |  |
Office/Industrial Properties [Member] | Highland Court [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances |  | $ 6,568,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land |  | 3,608,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements |  | 9,442,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total |  | 13,050,000 |  |  |
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements |  | 3,093,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land |  | 3,608,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements |  | 7,756,000 |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 14,457,000 |  |  |
Real Estate Accumulated Depreciation & Depreciation | [1] | 2,612,000 |  |  |
SEC Schedule III, Real Estate Investment Property, Net, Total |  | $ 11,845,000 |  |  |
Real Estate And Accumulated Depreciation Date Acquired |  | 08/15 |  |  |
Real Estate And Accumulated Depreciation Year Built Or Renovated |  | 1984 |  |  |
Office/Industrial Properties [Member] | One Park Centre [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances |  | $ 6,586,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land |  | 1,206,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements |  | 7,944,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total |  | 9,150,000 |  |  |
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements |  | 1,389,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land |  | 1,206,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements |  | 7,366,000 |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 9,961,000 |  |  |
Real Estate Accumulated Depreciation & Depreciation | [1] | 1,508,000 |  |  |
SEC Schedule III, Real Estate Investment Property, Net, Total |  | $ 8,453,000 |  |  |
Real Estate And Accumulated Depreciation Date Acquired |  | 08/15 |  |  |
Real Estate And Accumulated Depreciation Year Built Or Renovated |  | 1983 |  |  |
Office/Industrial Properties [Member] | Shea Center II [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances |  | $ 17,728,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land |  | 2,214,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements |  | 23,747,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total |  | 25,961,000 |  |  |
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements |  | 5,449,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land |  | 2,214,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements |  | 19,425,000 |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 27,088,000 |  |  |
Real Estate Accumulated Depreciation & Depreciation | [1] | 4,430,000 |  |  |
SEC Schedule III, Real Estate Investment Property, Net, Total |  | $ 22,658,000 |  |  |
Real Estate And Accumulated Depreciation Date Acquired |  | 12/15 |  |  |
Real Estate And Accumulated Depreciation Year Built Or Renovated |  | 2000 |  |  |
Retail Properties [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances |  | $ 17,025,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land |  | 6,206,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements |  | 22,950,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total |  | 29,156,000 |  |  |
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements |  | 2,544,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land |  | 6,239,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements |  | 21,853,000 |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 30,636,000 |  |  |
Real Estate Accumulated Depreciation & Depreciation | [1] | 5,453,000 |  |  |
Mortgage Loans on Real Estate, Write-down or Reserve, Amount |  | 1,533,000 |  |  |
SEC Schedule III, Real Estate Investment Property, Net, Total |  | 23,650,000 |  |  |
Retail Properties [Member] | World Plaza [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances |  | 3,351,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land |  | 1,698,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements |  | 6,232,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total |  | 7,930,000 |  |  |
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements |  | 1,116,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land |  | 1,698,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements |  | 6,263,000 |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 9,077,000 |  |  |
Real Estate Accumulated Depreciation & Depreciation | [1] | 2,197,000 |  |  |
Mortgage Loans on Real Estate, Write-down or Reserve, Amount |  | 700,000 |  |  |
SEC Schedule III, Real Estate Investment Property, Net, Total |  | $ 6,180,000 |  |  |
Real Estate And Accumulated Depreciation Date Acquired |  | 09/07 |  |  |
Real Estate And Accumulated Depreciation Year Built Or Renovated |  | 1974 |  |  |
Retail Properties [Member] | Waterman Plaza [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances |  | $ 3,370,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land |  | 2,350,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements |  | 4,814,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total |  | 7,164,000 |  |  |
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements |  | 556,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land |  | 2,383,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements |  | 4,324,000 |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 7,263,000 |  |  |
Real Estate Accumulated Depreciation & Depreciation | [1] | 1,453,000 |  |  |
Mortgage Loans on Real Estate, Write-down or Reserve, Amount |  | 833,000 |  |  |
SEC Schedule III, Real Estate Investment Property, Net, Total |  | $ 4,977,000 |  |  |
Real Estate And Accumulated Depreciation Date Acquired |  | 08/08 |  |  |
Real Estate And Accumulated Depreciation Year Built Or Renovated |  | 2008 |  |  |
Retail Properties [Member] | Union Town Center [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances |  | $ 8,440,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land |  | 1,750,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements |  | 9,462,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total |  | 11,212,000 |  |  |
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements |  | 713,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land |  | 1,750,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements |  | 8,917,000 |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 11,380,000 |  |  |
Real Estate Accumulated Depreciation & Depreciation | [1] | 1,476,000 |  |  |
SEC Schedule III, Real Estate Investment Property, Net, Total |  | $ 9,904,000 |  |  |
Real Estate And Accumulated Depreciation Date Acquired |  | 12/14 |  |  |
Real Estate And Accumulated Depreciation Year Built Or Renovated |  | 2003 |  |  |
Retail Properties [Member] | Research Parkway [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances |  | $ 1,864,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land |  | 408,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements |  | 2,442,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total |  | 2,850,000 |  |  |
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements |  | 159,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land |  | 408,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements |  | 2,349,000 |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 2,916,000 |  |  |
Real Estate Accumulated Depreciation & Depreciation | [1] | 327,000 |  |  |
SEC Schedule III, Real Estate Investment Property, Net, Total |  | $ 2,589,000 |  |  |
Real Estate And Accumulated Depreciation Date Acquired |  | 8/15/2016 |  |  |
Real Estate And Accumulated Depreciation Year Built Or Renovated |  | 2003 |  |  |
Model Home [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances |  | $ 32,729,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land |  | 8,089,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements |  | 42,389,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total |  | 50,478,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land |  | 8,090,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements |  | 42,389,000 |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 50,479,000 |  |  |
Real Estate Accumulated Depreciation & Depreciation | [1] | 1,716,000 |  |  |
SEC Schedule III, Real Estate Investment Property, Net, Total |  | 48,763,000 |  |  |
Model Home [Member] | NetREIT Dubose Model Home REIT, Inc. [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances |  | 4,809,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land |  | 1,387,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements |  | 7,019,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total |  | 8,406,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land |  | 1,387,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements |  | 7,020,000 |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 8,407,000 |  |  |
Real Estate Accumulated Depreciation & Depreciation | [1] | 459,000 |  |  |
SEC Schedule III, Real Estate Investment Property, Net, Total |  | $ 7,948,000 |  |  |
Real Estate And Accumulated Depreciation Date Acquired |  | 2010-2016 |  |  |
Model Home [Member] | NetREIT Dubose Model Home REIT, Inc. [Member] | Minimum [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate And Accumulated Depreciation Year Built Or Renovated |  | 2010 |  |  |
Model Home [Member] | NetREIT Dubose Model Home REIT, Inc. [Member] | Maximum [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate And Accumulated Depreciation Year Built Or Renovated |  | 2016 |  |  |
Model Home [Member] | Dubose Model Home Investors 201 L.P. [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances |  | $ 5,748,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land |  | 1,384,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements |  | 7,381,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total |  | 8,765,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land |  | 1,385,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements |  | 7,381,000 |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 8,766,000 |  |  |
Real Estate Accumulated Depreciation & Depreciation | [1] | 268,000 |  |  |
SEC Schedule III, Real Estate Investment Property, Net, Total |  | $ 8,498,000 |  |  |
Real Estate And Accumulated Depreciation Date Acquired |  | 2014-2018 |  |  |
Model Home [Member] | Dubose Model Home Investors 201 L.P. [Member] | Minimum [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate And Accumulated Depreciation Year Built Or Renovated |  | 2014 |  |  |
Model Home [Member] | Dubose Model Home Investors 201 L.P. [Member] | Maximum [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate And Accumulated Depreciation Year Built Or Renovated |  | 2018 |  |  |
Model Home [Member] | Dubose Model Home Investors 202, L.P. [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances |  | $ 7,959,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land |  | 1,911,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements |  | 10,220,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total |  | 12,131,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land |  | 1,911,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements |  | 10,220,000 |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 12,131,000 |  |  |
Real Estate Accumulated Depreciation & Depreciation | [1] | 472,000 |  |  |
SEC Schedule III, Real Estate Investment Property, Net, Total |  | $ 11,659,000 |  |  |
Real Estate And Accumulated Depreciation Date Acquired |  | 2016-2018 |  |  |
Model Home [Member] | Dubose Model Home Investors 202, L.P. [Member] | Minimum [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate And Accumulated Depreciation Year Built Or Renovated |  | 2016 |  |  |
Model Home [Member] | Dubose Model Home Investors 202, L.P. [Member] | Maximum [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate And Accumulated Depreciation Year Built Or Renovated |  | 2018 |  |  |
Model Home [Member] | Dubose Model Home Investors 204, L.P. [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances |  | $ 5,449,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land |  | 1,409,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements |  | 6,522,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total |  | 7,931,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land |  | 1,409,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements |  | 6,521,000 |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 7,930,000 |  |  |
Real Estate Accumulated Depreciation & Depreciation | [1] | 94,000 |  |  |
SEC Schedule III, Real Estate Investment Property, Net, Total |  | $ 7,836,000 |  |  |
Real Estate And Accumulated Depreciation Date Acquired |  | 2018 |  |  |
Real Estate And Accumulated Depreciation Year Built Or Renovated |  | 2018 |  |  |
Model Home [Member] | NetREIT Model Homes LLC [Member] |  |  |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances |  | $ 8,764,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land |  | 1,998,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements |  | 11,247,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total |  | 13,245,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land |  | 1,998,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements |  | 11,247,000 |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 13,245,000 |  |  |
Real Estate Accumulated Depreciation & Depreciation | [1] | 423,000 |  |  |
SEC Schedule III, Real Estate Investment Property, Net, Total |  | $ 12,822,000 |  |  |
Real Estate And Accumulated Depreciation Date Acquired |  | 2016 |  |  |
Real Estate And Accumulated Depreciation Year Built Or Renovated |  | 2016 |  |  |
[1] | Depreciation is computed on a straight-line basis using useful lives up to 39 years.
[2] | Property held for sale as of December 31, 2018 and sold for $5.6 million on January 15, 2019.

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