Segments (Net Operating Income by Segment) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net Operating Income [Abstract]
Rental income	$ 8,014,633	$ 8,251,068
Property and related expenses	(2,637,103)	(2,473,351)
Net operating income, as defined	5,609,424	5,984,223
General and administrative expenses	(1,257,211)	(1,230,411)
Depreciation and amortization	(2,503,516)	(2,659,531)
Interest expense	(3,316,196)	(3,388,602)
Interest income	9,268	21,739
Income tax expense	(27,416)	(68,548)
Gain on sale of real estate	541,462	175,486
Net Loss	(944,185)	(1,165,644)
Industrial Office Properties [Member]
Net Operating Income [Abstract]
Rental income	6,289,692	7,019,176
Property and related expenses	(2,218,518)	(2,232,590)
Net operating income, as defined	4,071,174	4,786,586
Residential Properties [Member]
Net Operating Income [Abstract]
Rental income	830,231	388,400
Property and related expenses	(38,956)	(17,704)
Net operating income, as defined	791,275	370,696
Retail Properties [Member]
Net Operating Income [Abstract]
Rental income	1,126,604	1,049,998
Property and related expenses	(379,629)	(223,057)
Net operating income, as defined	$ 746,975	$ 826,941