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Segments (Assets) (Details) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Segment Reporting Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net $ 248,840,940 $ 238,341,934    
Cash and cash equivalents 5,371,721 6,626,423 $ 4,475,600 $ 5,636,002
Other assets, net 6,136,444 5,895,991    
TOTAL ASSETS 257,268,849 254,274,393    
Significant Reconciling Items [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Other assets, net 3,056,188 9,306,036    
Industrial Office Properties [Member] | Operating Segments [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net [1] 180,373,842 181,776,776    
TOTAL ASSETS [2] 191,516,280 187,198,961    
Residential Properties [Member] | Operating Segments [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net [1] 20,125,666 13,914,168    
TOTAL ASSETS [2] 20,681,133 14,395,904    
Retail Properties [Member] | Operating Segments [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net [1] 35,090,222 35,395,235    
TOTAL ASSETS [2] $ 36,643,527 $ 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.