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Segments (Reconciliation to Total Assets) (Details) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Dec. 31, 2010
Segment Reporting, Asset Reconciling Item [Line Items]        
Real estate assets and lease intangibles, net $ 148,409,439 $ 133,336,214    
Mortgages receivable 920,216 1,032,082    
Cash And Cash Equivalents At Carrying Value 3,860,286 4,746,530 5,233,985 7,028,090
Other assets, net 4,914,425 4,655,425    
TOTAL ASSETS 172,174,505 161,651,931    
Industrial Office Properties [Member]
       
Segment Reporting, Asset Reconciling Item [Line Items]        
Real estate assets and lease intangibles, net 80,036,850 75,314,093    
TOTAL ASSETS 82,851,650 77,563,998    
Residential Properties [Member]
       
Segment Reporting, Asset Reconciling Item [Line Items]        
Real estate assets and lease intangibles, net 24,644,719 14,709,491    
TOTAL ASSETS 24,988,964 15,876,762    
Retail Properties [Member]
       
Segment Reporting, Asset Reconciling Item [Line Items]        
Real estate assets and lease intangibles, net 16,488,231 15,648,876    
TOTAL ASSETS 17,666,895 16,714,138    
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 27,239,639 27,663,755    
TOTAL ASSETS 27,390,959 27,832,381    
Reportable Segment [Member]
       
Segment Reporting, Asset Reconciling Item [Line Items]        
TOTAL ASSETS 153,818,684 139,019,361    
Unallocated Amount to Segment [Member]
       
Segment Reporting, Asset Reconciling Item [Line Items]        
Cash And Cash Equivalents At Carrying Value 3,860,286 4,872,081    
Other assets, net $ 3,443,472 $ 3,024,027