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Organization and Basis of Presentation (Details)
 9 Months Ended
Sep. 30, 2014
Counterparty
Property
Office Building [Member] | Wholly Owned or Hold Equity Interest [Member]
  
Real Estate Properties [Line Items]  
Number of properties 12
Industrial Building [Member] | Wholly Owned or Hold Equity Interest [Member]
  
Real Estate Properties [Line Items]  
Number of properties 1
Office Properties [Member] | Wholly Owned or Hold Equity Interest [Member]
  
Real Estate Properties [Line Items]  
Rentable square feet 963,000
Retail Shopping Center [Member] | Wholly Owned or Hold Equity Interest [Member]
  
Real Estate Properties [Line Items]  
Number of properties 4
Rentable square feet 186,000
Self Storage Facility [Member] | Wholly Owned or Hold Equity Interest [Member]
  
Real Estate Properties [Line Items]  
Number of properties 7
Rentable square feet 666,000
Model Home [Member]
  
Real Estate Properties [Line Items]  
Number of properties 55
Model Home [Member] | Wholly Owned or Hold Equity Interest [Member]
  
Real Estate Properties [Line Items]  
Number of properties 55
Number of limited partnership owners 4