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Segments (Reconciliation to Total Assets) (Details) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2010
Segment Reporting, Asset Reconciling Item [Line Items]        
Real estate assets and lease intangibles, net $ 162,358,183 $ 147,754,887    
Mortgages receivable 1,030,513 1,032,082    
Cash And Cash Equivalents At Carrying Value 1,317,090 4,872,081 8,418,017 7,028,090
Other assets, net 4,950,277 4,847,663    
TOTAL ASSETS 172,530,703 161,651,931    
Industrial Office Properties [Member]
       
Segment Reporting, Asset Reconciling Item [Line Items]        
Real estate assets and lease intangibles, net 80,613,576 75,314,093    
TOTAL ASSETS 83,181,162 77,563,998    
Residential Properties [Member]
       
Segment Reporting, Asset Reconciling Item [Line Items]        
Real estate assets and lease intangibles, net 29,784,726 21,129,410    
TOTAL ASSETS 30,225,135 22,434,205    
Retail Properties [Member]
       
Segment Reporting, Asset Reconciling Item [Line Items]        
Real estate assets and lease intangibles, net 24,570,334 23,647,629    
TOTAL ASSETS 25,841,101 24,893,157    
Mortgage Loan Activity [Member]
       
Segment Reporting, Asset Reconciling Item [Line Items]        
Mortgages receivable 1,031,307 1,032,082    
TOTAL ASSETS 1,031,307 1,032,082    
Self Storage Properties [Member]
       
Segment Reporting, Asset Reconciling Item [Line Items]        
Real estate assets and lease intangibles, net 27,389,547 27,663,755    
TOTAL ASSETS 27,590,550 27,832,381    
Reportable Segment [Member]
       
Segment Reporting, Asset Reconciling Item [Line Items]        
TOTAL ASSETS 167,869,255 153,755,823    
Unallocated Amount to Segment [Member]
       
Segment Reporting, Asset Reconciling Item [Line Items]        
Cash And Cash Equivalents At Carrying Value 1,317,090 4,872,081    
Other assets, net $ 3,344,358 $ 3,024,027