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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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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.

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