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Segments (Net Operating Income by Segment) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net Operating Income [Abstract]
Rental income	$ 7,794,585	$ 7,658,273	$ 15,809,218	$ 15,909,341
Property and related expenses	(2,636,063)	(2,585,013)	(5,273,165)	(5,058,364)
Net operating income, as defined	5,882,011	5,221,261	11,491,436	11,179,927
General and administrative expenses	(1,439,820)	(1,232,319)	(2,629,837)	(2,462,730)
Depreciation and amortization	(2,443,817)	(2,499,630)	(4,947,333)	(5,159,161)
Interest expense	(3,311,421)	(3,501,199)	(6,627,617)	(6,864,243)
Interest income	5,829	46,593	15,097	68,332
Income tax expense	(13,746)	(76,152)	(108,356)	(144,700)
Gain on sale of real estate	1,485,589	1,213,060	2,027,051	1,388,545
Net income (loss)	164,625	(828,386)	(779,559)	(1,994,030)
Office/Industrial Properties [Member]
Net Operating Income [Abstract]
Rental income	6,535,722	6,200,968	12,779,101	13,194,587
Property and related expenses	(2,295,720)	(2,140,237)	(4,514,238)	(4,373,491)
Net operating income, as defined	4,240,002	4,060,731	8,264,864	8,821,096
Residential Properties [Member]
Net Operating Income [Abstract]
Rental income	930,062	567,281	1,806,607	955,681
Property and related expenses	(35,038)	(61,376)	(73,995)	(78,416)
Net operating income, as defined	895,024	505,905	1,732,612	877,265
Retail/Mixed Use Properties [Member]
Net Operating Income [Abstract]
Rental income	1,052,289	1,038,025	2,178,893	2,088,023
Property and related expenses	(305,304)	(383,400)	(684,933)	(606,457)
Net operating income, as defined	$ 746,985	$ 654,625	$ 1,493,960	$ 1,481,566

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General And Administrative Expense Including Income tax expense (Benefit).

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Amount of expense incurred and directly related to generating revenue from leased and rented property or equipment.

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