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Segments (Net Operating Income by Segment) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Net Operating Income [Abstract] |  |
Rental income | $ 31,591,870 | $ 23,590,011
Property and related expenses | (10,135,345) | (8,515,151)
Net operating income, as defined | 22,316,767 | 15,332,319
General and administrative expenses | (5,424,479) | (5,193,888)
Depreciation and amortization | (10,256,185) | (7,784,917)
Interest expense | (13,531,337) | (10,774,660)
Interest income | 85,723 | 150,008
Gain on sale of real estate | 2,186,481 | 6,243,640
Impairment of real estate | (948,053) | 0
Net loss | (5,571,083) | (2,027,498)
Industrial Office Properties [Member] |  |
Net Operating Income [Abstract] |  |
Rental income | 25,564,763 | 18,497,621
Property and related expenses | (8,747,722) | (7,170,550)
Net operating income, as defined | 16,817,041 | 11,327,071
Residential Properties [Member] |  |
Net Operating Income [Abstract] |  |
Rental income | 2,278,832 | 1,521,148
Property and related expenses | (113,187) | (63,875)
Net operating income, as defined | 2,165,645 | 1,457,273
Retail Properties [Member] |  |
Net Operating Income [Abstract] |  |
Rental income | 4,608,517 | 3,960,076
Property and related expenses | (1,274,436) | (1,280,726)
Net operating income, as defined | $ 3,334,081 | 2,679,350
Self Storage Properties [Member] |  |
Net Operating Income [Abstract] |  |
Rental income |  | 1,052,266
Property and related expenses |  | (1,183,641)
Net operating income, as defined |  | $ (131,375)

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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=66902209&loc=d3e3602-108585 + Details
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