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Segments (Net Operating Income by Segment) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Net Operating Income [Abstract]        
Rental income $ 7,658,273 $ 5,396,700 $ 15,909,341 $ 10,740,383
Property and related expenses (2,585,013) (1,910,903) (5,058,364) (3,840,094)
Net operating income, as defined 5,221,261 3,519,310 11,179,927 6,992,623
General and administrative expenses (1,308,471) (1,139,112) (2,607,430) (2,293,914)
Depreciation and amortization (2,499,630) (1,814,786) (5,159,161) (3,676,332)
Interest expense (3,501,199) (2,276,022) (6,864,243) (4,655,614)
Interest income 46,593 21,153 68,332 35,757
Gain on sale of real estate 1,213,060 5,846,656 1,388,545 5,925,152
Net (loss) income (828,386) 4,157,199 (1,994,030) 2,327,672
Industrial Office Properties [Member]        
Net Operating Income [Abstract]        
Rental income 6,200,968 4,085,110 13,194,587 8,175,946
Property and related expenses (2,140,237) (1,564,983) (4,373,491) (3,135,551)
Net operating income, as defined 4,060,731 2,520,127 8,821,096 5,040,395
Residential Properties [Member]        
Net Operating Income [Abstract]        
Rental income 567,281 345,427 955,681 817,010
Property and related expenses (61,376) (23,609) (78,416) (34,847)
Net operating income, as defined 505,905 321,818 877,265 782,163
Retail Properties [Member]        
Net Operating Income [Abstract]        
Rental income 1,038,025 955,259 2,088,023 1,971,136
Property and related expenses (383,400) (322,311) (606,457) (669,696)
Net operating income, as defined $ 654,625 632,948 $ 1,481,566 1,301,440
Self Storage Properties [Member]        
Net Operating Income [Abstract]        
Rental income   159,289   1,052,266
Property and related expenses   (114,872)   (1,183,641)
Net operating income, as defined   $ 44,417   $ (131,375)