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Segments (Net Operating Income by Segment) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Net Operating Income [Abstract]        
Rental, fee and other income $ 7,950,356 $ 7,661,356 $ 23,740,115 $ 23,470,574
Property and related expenses (2,718,295) (2,794,071) (8,030,427) (8,067,236)
Net operating income, as defined 5,564,308 5,169,403 16,641,422 16,660,838
General and administrative expenses (1,384,974) (1,322,631) (4,041,453) (3,960,202)
Depreciation and amortization (2,268,896) (2,399,307) (6,873,828) (7,346,640)
Interest expense (3,281,088) (3,191,152) (9,505,244) (9,818,767)
Other expense 8,466 10,515 2,624 25,612
Deferred offering costs     (1,507,599)  
Income tax expense (69,683) (53,566) (225,341) (154,189)
Impairment of real estate assets (532,951)   (532,951)  
Gain on sale of real estate 366,032 210,372 795,521 2,237,423
Net loss (1,598,787) (1,576,366) (5,246,847) (2,355,925)
Office/Industrial Properties [Member]        
Net Operating Income [Abstract]        
Rental, fee and other income 6,118,429 5,924,773 18,333,962 18,703,971
Property and related expenses (2,348,532) (2,413,777) (7,005,628) (6,928,015)
Net operating income, as defined 3,769,896 3,510,996 11,328,334 11,775,956
Model Home Properties [Member]        
Net Operating Income [Abstract]        
Rental, fee and other income 1,211,327 983,426 3,504,983 2,790,032
Property and related expenses (44,704) (35,239) (132,055) (109,233)
Net operating income, as defined 1,166,623 948,187 3,372,928 2,680,799
Retail/Mixed Use Properties [Member]        
Net Operating Income [Abstract]        
Rental, fee and other income 952,846 1,055,177 2,832,906 3,234,071
Property and related expenses (325,058) (344,957) (892,746) (1,029,987)
Net operating income, as defined $ 627,788 $ 710,220 $ 1,940,160 $ 2,204,083