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Segments, Assets (Details) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Segment Reporting, Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net $ 158,765,430 $ 159,455,162    
Cash and cash equivalents 7,233,620 10,207,001 9,851,143 10,746,536
Other assets, net 6,745,789 6,678,669    
Total Assets 177,694,257 181,245,382    
Industrial Office Properties [Member]
        
Segment Reporting, Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net 84,310,677 [1] 84,458,209 [1]    
Total Assets 88,854,479 [2] 89,813,764 [2]    
Residential Properties [Member]
        
Segment Reporting, Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net 22,714,834 [1] 23,093,296 [1]    
Total Assets 24,237,880 [2] 25,434,100 [2]    
Retail Properties [Member]
        
Segment Reporting, Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net 21,941,102 [1] 21,931,330 [1]    
Total Assets 23,378,694 [2] 23,354,122 [2]    
Self Storage Properties [Member]
        
Segment Reporting, Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net 29,798,817 [1] 29,972,327 [1]    
Total Assets 30,689,495 [2] 31,028,008 [2]    
Reportable Segments [Member]
        
Segment Reporting, Asset Reconciling Item [Line Items]        
Total Assets 167,160,548 169,629,994    
Significant Reconciling Items [Member]
        
Segment Reporting, Asset Reconciling Item [Line Items]        
Cash and cash equivalents 7,233,620 10,207,001    
Other assets, net $ 3,300,089 $ 1,408,387    
[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.