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Segments (Assets) (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Asset Reconciling Item [Line Items]      
Land, buildings and improvements, net $ 246,969,993 $ 239,948,063  
Cash and cash equivalents 3,116,147 6,626,423 $ 5,636,002
Other assets, net 5,745,982 5,895,991  
TOTAL ASSETS 257,999,077 254,274,393  
Significant Reconciling Items [Member]      
Segment Reporting Asset Reconciling Item [Line Items]      
Other assets, net 7,912,937 7,699,907  
Industrial Office Properties [Member] | Operating Segments [Member]      
Segment Reporting Asset Reconciling Item [Line Items]      
Land, buildings and improvements, net [1] 172,309,537 178,776,776  
TOTAL ASSETS [2] 175,689,722 188,805,090  
Residential Properties [Member] | Operating Segments [Member]      
Segment Reporting Asset Reconciling Item [Line Items]      
Land, buildings and improvements, net [1] 34,813,680 16,888,267  
TOTAL ASSETS [2] 35,960,179 14,395,904  
Retail Properties [Member] | Operating Segments [Member]      
Segment Reporting Asset Reconciling Item [Line Items]      
Land, buildings and improvements, net [1] 33,398,992 35,395,235  
TOTAL ASSETS [2] $ 35,320,092 $ 36,747,069  
[1] Includes lease intangibles and the land purchase option related to property acquisitions.
[2] Includes land, buildings and improvements, current receivables, deferred rent receivables and deferred leasing costs and other related intangible assets, all shown on a net basis.