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Segments (Reconciliation to Total Assets) (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting, Asset Reconciling Item [Line Items]      
Real estate assets and lease intangibles, net $ 165,638,719 $ 147,754,887  
Mortgages receivable 920,216 1,032,082  
Cash And Cash Equivalents At Carrying Value 10,746,536 4,872,081 7,028,090
Other assets, net 5,813,399 4,847,663  
TOTAL ASSETS 185,131,993 161,651,931  
Industrial Office Properties [Member]
     
Segment Reporting, Asset Reconciling Item [Line Items]      
Real estate assets and lease intangibles, net 86,695,553 75,314,093  
TOTAL ASSETS 90,286,093 77,563,998  
Residential Properties [Member]
     
Segment Reporting, Asset Reconciling Item [Line Items]      
Real estate assets and lease intangibles, net 29,399,405 21,129,410  
TOTAL ASSETS 31,869,016 22,434,205  
Retail Properties [Member]
     
Segment Reporting, Asset Reconciling Item [Line Items]      
Real estate assets and lease intangibles, net 22,613,528 23,647,629  
TOTAL ASSETS 23,913,305 24,893,157  
Mortgage Loan Activity [Member]
     
Segment Reporting, Asset Reconciling Item [Line Items]      
Mortgages receivable 920,216 1,032,082  
TOTAL ASSETS 920,216 1,032,082  
Self Storage Properties [Member]
     
Segment Reporting, Asset Reconciling Item [Line Items]      
Real estate assets and lease intangibles, net 26,930,233 27,663,755  
TOTAL ASSETS 27,384,412 27,832,381  
Reportable Segment [Member]
     
Segment Reporting, Asset Reconciling Item [Line Items]      
TOTAL ASSETS 174,373,042 153,755,823  
Unallocated Amount to Segment [Member]
     
Segment Reporting, Asset Reconciling Item [Line Items]      
Cash And Cash Equivalents At Carrying Value 10,746,536 4,872,081  
Other assets, net $ 12,415 $ 3,024,027