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Segments (Reconciliation to Total Assets) (Details) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Segment Reporting, Asset Reconciling Item [Line Items]        
Real estate assets and lease intangibles, net $ 162,493,176 $ 165,638,719    
Mortgages receivable 920,216 920,216    
Cash And Cash Equivalents At Carrying Value 9,851,143 10,746,536 4,176,410 4,872,081
Other assets, net 8,430,844 5,813,399    
TOTAL ASSETS 183,744,980 185,131,993    
Industrial Office Properties [Member]
       
Segment Reporting, Asset Reconciling Item [Line Items]        
Real estate assets and lease intangibles, net 86,249,185 86,695,553    
TOTAL ASSETS 90,760,189 90,286,093    
Residential Properties [Member]
       
Segment Reporting, Asset Reconciling Item [Line Items]        
Real estate assets and lease intangibles, net 27,040,877 29,399,405    
TOTAL ASSETS 32,334,118 31,869,016    
Retail Properties [Member]
       
Segment Reporting, Asset Reconciling Item [Line Items]        
Real estate assets and lease intangibles, net 22,420,110 22,613,528    
TOTAL ASSETS 23,799,839 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 26,783,004 26,930,233    
TOTAL ASSETS 27,475,318 27,384,412    
Reportable Segment [Member]
       
Segment Reporting, Asset Reconciling Item [Line Items]        
TOTAL ASSETS 175,289,680 174,373,042    
Unallocated Amount to Segment [Member]
       
Segment Reporting, Asset Reconciling Item [Line Items]        
Cash And Cash Equivalents At Carrying Value 9,851,143 10,746,536    
Other assets, net $ (1,395,843) $ 12,415