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Fair Value of Financial Instruments (Details Textual) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Mortgage Payable At Carrying Value $ 254.3cik0001442626_MortgagePayableAtCarryingValue
Mortgage Payable At Fair Value $ 260.6cik0001442626_MortgagePayableAtFairValue