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SEGMENTS (Net Operating Income by Segment) (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Net Operating Income [Abstract] |  |  |  |  |  |  |  |
Rental, fees and other income | $ 7,000,870 |  |  | $ 8,282,602 |  |  | $ 21,301,121 | $ 24,671,851
Net operating income, as defined | 4,467,806 |  |  | 5,564,307 |  |  | 13,478,505 | 16,641,424
General and administrative expenses | (1,451,873) |  |  | (1,384,974) |  |  | (4,632,244) | (4,041,453)
Depreciation and amortization | (1,755,253) |  |  | (2,268,896) |  |  | (5,714,446) | (6,873,828)
Interest expense | (2,830,858) |  |  | (3,281,088) |  |  | (7,867,932) | (9,505,244)
Other income (expense) | 9,294 |  |  | 8,466 |  |  | 19,227 | 2,624
Registration fees | 0 |  |  | 0 |  |  | 0 | (1,507,599)
Income tax expense | (338,713) |  |  | (69,683) |  |  | (611,952) | (225,341)
Impairment of real estate assets | 0 |  |  | 532,951 |  |  | 0 | 532,951
Gain on sale of real estate | 4,853,186 |  |  | 366,032 |  |  | 6,243,819 | 795,521
Net income (loss) | 2,953,589 | $ (1,076,674) | $ (961,937) | (1,598,787) | $ (2,496,998) | $ (1,151,061) | 914,977 | (5,246,847)
Office/Industrial Properties |  |  |  |  |  |  |  |
Net Operating Income [Abstract] |  |  |  |  |  |  |  |
Rental, fees and other income | 5,137,114 |  |  | 6,118,429 |  |  | 16,087,363 | 18,333,962
Operating Leases, Rent Expense | 2,237,392 |  |  | 2,348,533 |  |  | 7,041,306 | 7,005,626
Net operating income, as defined | 2,899,722 |  |  | 3,769,896 |  |  | 9,046,057 | 11,328,336
Model Home properties |  |  |  |  |  |  |  |
Net Operating Income [Abstract] |  |  |  |  |  |  |  |
Rental, fees and other income | 1,083,470 |  |  | 1,211,327 |  |  | 3,167,072 | 3,504,983
Operating Leases, Rent Expense | 42,258 |  |  | 44,704 |  |  | 140,866 | 132,055
Net operating income, as defined | 1,041,212 |  |  | 1,166,623 |  |  | 3,026,206 | 3,372,928
Retail Use Properties |  |  |  |  |  |  |  |
Net Operating Income [Abstract] |  |  |  |  |  |  |  |
Rental, fees and other income | 780,286 |  |  | 952,846 |  |  | 2,046,686 | 2,832,906
Operating Leases, Rent Expense | 253,414 |  |  | 325,058 |  |  | 640,444 | 892,746
Net operating income, as defined | $ 526,872 |  |  | $ 627,788 |  |  | $ 1,406,242 | $ 1,940,160

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