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Segments (Reconciliation to Total Assets) (Details) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
Segment Reporting, Asset Reconciling Item [Line Items]        
Real estate assets and lease intangibles, net $ 160,556,455 $ 165,638,719    
Mortgages receivable 920,216 920,216    
Cash And Cash Equivalents At Carrying Value 8,611,182 10,746,536 3,933,288 4,872,081
Other assets, net 8,490,789 5,813,399    
TOTAL ASSETS 180,916,237 185,131,993    
Industrial Office Properties [Member]
       
Segment Reporting, Asset Reconciling Item [Line Items]        
Real estate assets and lease intangibles, net 85,039,844 86,695,553    
TOTAL ASSETS 91,681,052 90,286,093    
Residential Properties [Member]
       
Segment Reporting, Asset Reconciling Item [Line Items]        
Real estate assets and lease intangibles, net 23,293,730 29,399,405    
TOTAL ASSETS 23,619,550 31,869,016    
Retail Properties [Member]
       
Segment Reporting, Asset Reconciling Item [Line Items]        
Real estate assets and lease intangibles, net 22,090,970 22,613,528    
TOTAL ASSETS 23,457,174 23,913,305    
Mortgage Loan Activity [Member]
       
Segment Reporting, Asset Reconciling Item [Line Items]        
Mortgages receivable 920,216 920,216    
TOTAL ASSETS 920,216 920,216    
Self Storage Properties [Member]
       
Segment Reporting, Asset Reconciling Item [Line Items]        
Real estate assets and lease intangibles, net 30,131,911 26,930,233    
TOTAL ASSETS 31,028,008 27,384,412    
Reportable Segment [Member]
       
Segment Reporting, Asset Reconciling Item [Line Items]        
TOTAL ASSETS 170,706,000 174,373,042    
Unallocated Amount to Segment [Member]
       
Segment Reporting, Asset Reconciling Item [Line Items]        
Cash And Cash Equivalents At Carrying Value 8,611,182 10,746,536    
Other assets, net $ 1,599,055 $ 12,415