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Segments (Reconciliation to Total Assets) (Details) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Segment Reporting, Asset Reconciling Item [Line Items]        
Real estate assets and lease intangibles, net $ 163,499,554 $ 165,638,719    
Mortgages receivable 920,216 920,216    
Cash And Cash Equivalents At Carrying Value 7,807,237 10,746,536 1,317,090 4,872,081
Other assets, net 8,361,884 5,813,399    
TOTAL ASSETS 182,540,635 185,131,993    
Industrial Office Properties [Member]
       
Segment Reporting, Asset Reconciling Item [Line Items]        
Real estate assets and lease intangibles, net 86,430,146 86,695,553    
TOTAL ASSETS 90,613,146 90,286,093    
Residential Properties [Member]
       
Segment Reporting, Asset Reconciling Item [Line Items]        
Real estate assets and lease intangibles, net 24,552,141 29,399,405    
TOTAL ASSETS 25,063,971 31,869,016    
Retail Properties [Member]
       
Segment Reporting, Asset Reconciling Item [Line Items]        
Real estate assets and lease intangibles, net 22,232,138 22,613,528    
TOTAL ASSETS 23,561,013 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 30,285,129 26,930,233    
TOTAL ASSETS 30,999,387 27,384,412    
Reportable Segment [Member]
       
Segment Reporting, Asset Reconciling Item [Line Items]        
TOTAL ASSETS 171,157,733 174,373,042    
Unallocated Amount to Segment [Member]
       
Segment Reporting, Asset Reconciling Item [Line Items]        
Cash And Cash Equivalents At Carrying Value 7,807,237 10,746,536    
Other assets, net $ 3,575,665 $ 12,415