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Segments (Net Operating Income by Segment) (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Net Operating Income [Abstract] |  |  |  |
Rental income | $ 7,661,356 | $ 7,693,017 | $ 23,470,574 | $ 23,602,360
Property and related expenses | (2,794,071) | (2,576,781) | (8,067,236) | (7,635,145)
Net operating income, as defined | 5,169,403 | 5,276,852 | 16,660,838 | 16,456,780
General and administrative expenses | (1,322,631) | (1,252,299) | (3,960,202) | (3,715,029)
Depreciation and amortization | (2,399,307) | (2,564,211) | (7,346,640) | (7,723,372)
Interest expense | (3,191,152) | (3,323,740) | (9,818,767) | (10,187,983)
Interest income | 10,515 | 9,892 | 25,612 | 78,224
Income tax expense | (53,566) | (87,898) | (154,189) | (232,598)
Impairment of real estate asset |  | (700,000) |  | (700,000)
Gain on sale of real estate | 210,372 | 732,908 | 2,237,423 | 2,121,453
Net loss | (1,576,366) | (1,908,496) | (2,355,925) | (3,902,525)
Office/Industrial Properties [Member] |  |  |  |
Net Operating Income [Abstract] |  |  |  |
Rental income | 5,924,773 | 6,204,750 | 18,703,971 | 19,258,901
Property and related expenses | (2,413,777) | (2,220,366) | (6,928,015) | (6,603,192)
Net operating income, as defined | 3,510,996 | 3,984,384 | 11,775,956 | 12,655,709
Residential Properties [Member] |  |  |  |
Net Operating Income [Abstract] |  |  |  |
Rental income | 983,426 | 548,260 | 2,790,032 | 1,555,405
Property and related expenses | (35,239) | (25,061) | (109,233) | (94,142)
Net operating income, as defined | 948,187 | 523,199 | 2,680,799 | 1,461,263
Retail/Mixed Use Properties [Member] |  |  |  |
Net Operating Income [Abstract] |  |  |  |
Rental income | 1,055,177 | 1,100,623 | 3,234,071 | 3,277,619
Property and related expenses | (344,957) | (331,354) | (1,029,987) | (937,811)
Net operating income, as defined | $ 710,220 | $ 769,269 | $ 2,204,083 | $ 2,339,808

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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