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Segments (Net Operating Income by Segment) (Details) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Net Operating Income [Abstract]    
Rental, fee and other income $ 7,946,106 $ 8,014,633
Property and related expenses (2,649,909) (2,637,103)
Net operating income, as defined 5,574,924 5,609,424
General and administrative expenses (1,333,465) (1,257,211)
Depreciation and amortization (2,339,044) (2,503,516)
Interest expense (3,076,975) (3,316,196)
Other expense / (income) (18,291) 9,268
Income tax expense (32,423) (27,416)
Gain on sale of real estate 74,213 541,462
Net loss (1,151,061) (944,185)
Office/Industrial Properties [Member]    
Net Operating Income [Abstract]    
Rental, fee and other income 6,157,146 6,289,692
Property and related expenses (2,350,611) (2,218,518)
Net operating income, as defined 3,806,535 4,071,174
Model Home Properties [Member]    
Net Operating Income [Abstract]    
Rental, fee and other income 1,123,767 830,231
Property and related expenses (52,526) (38,956)
Net operating income, as defined 1,071,241 791,275
Retail/Mixed Use Properties [Member]    
Net Operating Income [Abstract]    
Rental, fee and other income 943,920 1,126,604
Property and related expenses (246,772) (379,629)
Net operating income, as defined $ 697,148 $ 746,975