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Schedule III - Real Estate and Accumulated Depreciation and Amortization - Properties (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Encumbrances |  | $ 89,422,000 |  |  |
Land, Initial Cost |  | 22,995,000 |  |  |
Building and Improvements, Initial Cost |  | 132,151,000 |  |  |
Acquisition Price |  | 155,146,000 |  |  |
Capitalized Improvements |  | 16,876,000 |  |  |
Land Cost, Total Cost |  | 22,995,000 |  |  |
Building & Improvements, Total Cost |  | 149,028,000 |  |  |
Total cost |  | 172,022,000 |  |  |
Accumulated Depreciation & Depreciation |  | 32,948,757 | [1] | $ 42,387,199 | $ 44,113,962
Reserve for Impairment |  | 1,008,000 |  |  |
NBV Real Estate |  | 138,065,000 |  |  |
Industrial Office Properties [Member] |  |  |  |  |
Encumbrances |  | 57,389,000 |  |  |
Land, Initial Cost |  | 11,981,000 |  |  |
Building and Improvements, Initial Cost |  | 80,536,000 |  |  |
Acquisition Price |  | 92,517,000 |  |  |
Capitalized Improvements |  | 12,556,000 |  |  |
Land Cost, Total Cost |  | 11,981,000 |  |  |
Building & Improvements, Total Cost |  | 93,092,000 |  |  |
Total cost |  | 105,073,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 26,482,000 |  |  |
Reserve for Impairment |  | 308,000 |  |  |
NBV Real Estate |  | 78,283,000 |  |  |
Industrial Office Properties [Member] | Genesis Plaza [Member] |  |  |  |  |
Encumbrances |  | 6,169,000 |  |  |
Land, Initial Cost |  | 1,400,000 |  |  |
Building and Improvements, Initial Cost |  | 8,600,000 |  |  |
Acquisition Price |  | 10,000,000 |  |  |
Capitalized Improvements |  | 2,661,000 |  |  |
Land Cost, Total Cost |  | 1,400,000 |  |  |
Building & Improvements, Total Cost |  | 11,261,000 |  |  |
Total cost |  | 12,661,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 4,350,000 |  |  |
Reserve for Impairment |  | 0 |  |  |
NBV Real Estate |  | 8,311,000 |  |  |
Industrial Office Properties [Member] | Dakota Center [Member] |  |  |  |  |
Encumbrances |  | 9,677,000 |  |  |
Land, Initial Cost |  | 832,000 |  |  |
Building and Improvements, Initial Cost |  | 8,743,000 |  |  |
Acquisition Price |  | 9,575,000 |  |  |
Capitalized Improvements |  | 2,876,000 |  |  |
Land Cost, Total Cost |  | 832,000 |  |  |
Building & Improvements, Total Cost |  | 11,619,000 |  |  |
Total cost |  | 12,451,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 3,844,000 |  |  |
Reserve for Impairment |  | 0 |  |  |
NBV Real Estate |  | 8,607,000 |  |  |
Industrial Office Properties [Member] | Grand Pacific Center [Member] |  |  |  |  |
Encumbrances |  | 3,620,000 |  |  |
Land, Initial Cost |  | 413,000 |  |  |
Building and Improvements, Initial Cost |  | 4,926,000 |  |  |
Acquisition Price |  | 5,339,000 |  |  |
Capitalized Improvements |  | 2,124,000 |  |  |
Land Cost, Total Cost |  | 413,000 |  |  |
Building & Improvements, Total Cost |  | 7,050,000 |  |  |
Total cost |  | 7,463,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 2,006,000 |  |  |
Reserve for Impairment |  | 0 |  |  |
NBV Real Estate |  | 5,457,000 |  |  |
Industrial Office Properties [Member] | Arapahoe Center [Member] |  |  |  |  |
Encumbrances |  | 7,771,000 |  |  |
Land, Initial Cost |  | 1,420,000 |  |  |
Building and Improvements, Initial Cost |  | 10,430,000 |  |  |
Acquisition Price |  | 11,850,000 |  |  |
Capitalized Improvements |  | 592,000 |  |  |
Land Cost, Total Cost |  | 1,420,000 |  |  |
Building & Improvements, Total Cost |  | 11,022,000 |  |  |
Total cost |  | 12,442,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 3,621,000 |  |  |
Reserve for Impairment |  | 0 |  |  |
NBV Real Estate |  | 8,821,000 |  |  |
Industrial Office Properties [Member] | West Fargo Industrial [Member] |  |  |  |  |
Encumbrances |  | 4,148,000 |  |  |
Land, Initial Cost |  | 1,693,000 |  |  |
Building and Improvements, Initial Cost |  | 6,207,000 |  |  |
Acquisition Price |  | 7,900,000 |  |  |
Capitalized Improvements |  | 351,000 |  |  |
Land Cost, Total Cost |  | 1,693,000 |  |  |
Building & Improvements, Total Cost |  | 6,558,000 |  |  |
Total cost |  | 8,251,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 1,226,000 |  |  |
Reserve for Impairment |  | 0 |  |  |
NBV Real Estate |  | 7,025,000 |  |  |
Industrial Office Properties [Member] | The 300 N.P [Member] |  |  |  |  |
Encumbrances |  | 2,233,000 |  |  |
Land, Initial Cost |  | 135,000 |  |  |
Building and Improvements, Initial Cost |  | 3,715,000 |  |  |
Acquisition Price |  | 3,850,000 |  |  |
Capitalized Improvements |  | 273,000 |  |  |
Land Cost, Total Cost |  | 135,000 |  |  |
Building & Improvements, Total Cost |  | 3,988,000 |  |  |
Total cost |  | 4,123,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 885,000 |  |  |
Reserve for Impairment |  | 308,000 |  |  |
NBV Real Estate |  | 2,930,000 |  |  |
Industrial Office Properties [Member] | One Park Centre [Member] |  |  |  |  |
Encumbrances |  | 6,277,000 |  |  |
Land, Initial Cost |  | 1,206,000 |  |  |
Building and Improvements, Initial Cost |  | 7,944,000 |  |  |
Acquisition Price |  | 9,150,000 |  |  |
Capitalized Improvements |  | 1,398,000 |  |  |
Land Cost, Total Cost |  | 1,206,000 |  |  |
Building & Improvements, Total Cost |  | 9,342,000 |  |  |
Total cost |  | 10,548,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 2,555,000 |  |  |
Reserve for Impairment |  | 0 |  |  |
NBV Real Estate |  | 7,992,000 |  |  |
Industrial Office Properties [Member] | Shea Center II [Member] |  |  |  |  |
Encumbrances |  | 17,495,000 |  |  |
Land, Initial Cost |  | 2,214,000 |  |  |
Building and Improvements, Initial Cost |  | 23,747,000 |  |  |
Acquisition Price |  | 25,961,000 |  |  |
Capitalized Improvements |  | 2,281,000 |  |  |
Land Cost, Total Cost |  | 2,214,000 |  |  |
Building & Improvements, Total Cost |  | 26,028,000 |  |  |
Total cost |  | 28,241,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 7,995,000 |  |  |
Reserve for Impairment |  | 0 |  |  |
NBV Real Estate |  | 20,247,000 |  |  |
Industrial Office Properties [Member] | Baltimore [Member] |  |  |  |  |
Encumbrances |  | 0 |  |  |
Land, Initial Cost |  | 2,668,000 |  |  |
Building and Improvements, Initial Cost |  | 6,224,000 |  |  |
Acquisition Price |  | 8,892,000 |  |  |
Capitalized Improvements |  | 0 |  |  |
Land Cost, Total Cost |  | 2,668,000 |  |  |
Building & Improvements, Total Cost |  | 6,224,000 |  |  |
Total cost |  | 8,892,000 |  |  |
Accumulated Depreciation & Depreciation |  | 0 |  |  |
Reserve for Impairment |  |  |  |  |
NBV Real Estate |  | 8,892,000 |  |  |
Industrial Office Properties [Member] | Mandolin [Member] |  |  |  |  |
Total cost |  | 4,906,000 |  |  |
Retail Properties [Member] |  |  |  |  |
Encumbrances |  | 9,879,000 |  |  |
Land, Initial Cost |  | 5,186,000 |  |  |
Building and Improvements, Initial Cost |  | 21,698,000 |  |  |
Acquisition Price |  | 26,884,000 |  |  |
Capitalized Improvements |  | 4,320,000 |  |  |
Land Cost, Total Cost |  | 5,186,000 |  |  |
Building & Improvements, Total Cost |  | 26,018,000 |  |  |
Total cost |  | 31,203,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 4,810,000 |  |  |
Reserve for Impairment |  | 700,000 |  |  |
NBV Real Estate |  | 25,693,000 |  |  |
Retail Properties [Member] | World Plaza [Member] |  |  |  |  |
Encumbrances | [2] | 0 |  |  |
Land, Initial Cost | [2] | 1,698,000 |  |  |
Building and Improvements, Initial Cost | [2] | 6,232,000 |  |  |
Acquisition Price | [2] | 7,930,000 |  |  |
Capitalized Improvements | [2] | 4,289,000 |  |  |
Land Cost, Total Cost | [2] | 1,698,000 |  |  |
Building & Improvements, Total Cost | [2] | 10,521,000 |  |  |
Total cost | [2] | 12,219,000 |  |  |
Accumulated Depreciation & Depreciation | [1],[2] | 2,246,000 |  |  |
Reserve for Impairment | [2] | 700,000 |  |  |
NBV Real Estate | [2] | 9,272,000 |  |  |
Retail Properties [Member] | Union Town Center [Member] |  |  |  |  |
Encumbrances |  | 8,174,000 |  |  |
Land, Initial Cost |  | 1,750,000 |  |  |
Building and Improvements, Initial Cost |  | 9,462,000 |  |  |
Acquisition Price |  | 11,212,000 |  |  |
Capitalized Improvements |  | 67,000 |  |  |
Land Cost, Total Cost |  | 1,750,000 |  |  |
Building & Improvements, Total Cost |  | 9,529,000 |  |  |
Total cost |  | 11,279,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 2,110,000 |  |  |
Reserve for Impairment |  | 0 |  |  |
NBV Real Estate |  | 9,169,000 |  |  |
Retail Properties [Member] | Research Parkway [Member] |  |  |  |  |
Encumbrances |  | 1,705,000 |  |  |
Land, Initial Cost |  | 408,000 |  |  |
Building and Improvements, Initial Cost |  | 2,442,000 |  |  |
Acquisition Price |  | 2,850,000 |  |  |
Capitalized Improvements |  | (50,000) |  |  |
Land Cost, Total Cost |  | 408,000 |  |  |
Building & Improvements, Total Cost |  | 2,392,000 |  |  |
Total cost |  | 2,799,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 424,000 |  |  |
Reserve for Impairment |  | 0 |  |  |
NBV Real Estate |  | 2,376,000 |  |  |
Retail Properties [Member] | Mandolin [Member] |  |  |  |  |
Encumbrances |  | 0 |  |  |
Land, Initial Cost |  | 1,330,000 |  |  |
Building and Improvements, Initial Cost |  | 3,562,000 |  |  |
Acquisition Price |  | 4,892,000 |  |  |
Capitalized Improvements |  | 15,000 |  |  |
Land Cost, Total Cost |  | 1,330,000 |  |  |
Building & Improvements, Total Cost |  | 3,577,000 |  |  |
Accumulated Depreciation & Depreciation |  | 31,000 |  |  |
Reserve for Impairment |  | 0 |  |  |
NBV Real Estate |  | 4,876,000 |  |  |
Model Home [Member] |  |  |  |  |
Encumbrances |  | 22,154,000 |  |  |
Land, Initial Cost |  | 5,828,000 |  |  |
Building and Improvements, Initial Cost |  | 29,917,000 |  |  |
Acquisition Price |  | 35,746,000 |  |  |
Land Cost, Total Cost |  | 5,828,000 |  |  |
Building & Improvements, Total Cost |  | 29,917,000 |  |  |
Total cost |  | 35,746,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 1,657,000 |  |  |
NBV Real Estate |  | 34,089,000 |  |  |
Model Home [Member] | Model Homes-DMH LP #202 [Member] |  |  |  |  |
Encumbrances |  | 822,000 |  |  |
Land, Initial Cost |  | 235,000 |  |  |
Building and Improvements, Initial Cost |  | 1,435,000 |  |  |
Acquisition Price |  | 1,670,000 |  |  |
Land Cost, Total Cost |  | 235,000 |  |  |
Building & Improvements, Total Cost |  | 1,435,000 |  |  |
Total cost |  | 1,670,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 141,000 |  |  |
NBV Real Estate |  | 1,529,000 |  |  |
Model Home [Member] | Model Homes-DMH LP #203 [Member] |  |  |  |  |
Encumbrances |  | 3,273,000 |  |  |
Land, Initial Cost |  | 1,080,000 |  |  |
Building and Improvements, Initial Cost |  | 4,697,000 |  |  |
Acquisition Price |  | 5,777,000 |  |  |
Land Cost, Total Cost |  | 1,080,000 |  |  |
Building & Improvements, Total Cost |  | 4,697,000 |  |  |
Total cost |  | 5,777,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 412,000 |  |  |
NBV Real Estate |  | 5,365,000 |  |  |
Model Home [Member] | Model Homes-DMH LP #204 [Member] |  |  |  |  |
Encumbrances |  | 2,810,000 |  |  |
Land, Initial Cost |  | 980,000 |  |  |
Building and Improvements, Initial Cost |  | 4,903,000 |  |  |
Acquisition Price |  | 5,883,000 |  |  |
Land Cost, Total Cost |  | 980,000 |  |  |
Building & Improvements, Total Cost |  | 4,903,000 |  |  |
Total cost |  | 5,883,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 361,000 |  |  |
NBV Real Estate |  | 5,522,000 |  |  |
Model Home [Member] | Model Homes-DMH LP #205 [Member] |  |  |  |  |
Encumbrances |  | 4,207,000 |  |  |
Land, Initial Cost |  | 1,260,000 |  |  |
Building and Improvements, Initial Cost |  | 5,223,000 |  |  |
Acquisition Price |  | 6,482,000 |  |  |
Land Cost, Total Cost |  | 1,260,000 |  |  |
Building & Improvements, Total Cost |  | 5,223,000 |  |  |
Total cost |  | 6,482,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 280,000 |  |  |
NBV Real Estate |  | 6,202,000 |  |  |
Model Home [Member] | Model Homes-DMH LP #206 [Member] |  |  |  |  |
Encumbrances |  | 2,097,000 |  |  |
Land, Initial Cost |  | 392,000 |  |  |
Building and Improvements, Initial Cost |  | 2,740,000 |  |  |
Acquisition Price |  | 3,132,000 |  |  |
Land Cost, Total Cost |  | 392,000 |  |  |
Building & Improvements, Total Cost |  | 2,740,000 |  |  |
Total cost |  | 3,132,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 75,000 |  |  |
NBV Real Estate |  | 3,057,000 |  |  |
Model Home [Member] | Model Homes-NMH Inc. [Member] |  |  |  |  |
Encumbrances |  | 8,945,000 |  |  |
Land, Initial Cost |  | 1,881,000 |  |  |
Building and Improvements, Initial Cost |  | 10,920,000 |  |  |
Acquisition Price |  | 12,801,000 |  |  |
Land Cost, Total Cost |  | 1,881,000 |  |  |
Building & Improvements, Total Cost |  | 10,920,000 |  |  |
Total cost |  | 12,801,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 388,000 |  |  |
NBV Real Estate |  | $ 12,413,000 |  |  |
[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, 2021.

X
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