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Investments in Unconsolidated Real Estate Joint Ventures (Details Textual) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Equity Method Investment And Joint Venture [Line Items]  
Ground Lease Term 85 years
BRG Southside, LLC [Member]  
Equity Method Investment And Joint Venture [Line Items]  
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value 17.4us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeFairValue1
/ dei_LegalEntityAxis
= cik0001442626_BrgSouthsideLlcMember
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage 100.00%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage
/ dei_LegalEntityAxis
= cik0001442626_BrgSouthsideLlcMember
Alexan Blaire House [Member]  
Equity Method Investment And Joint Venture [Line Items]  
Capital Contribution To Venture 8.7cik0001442626_CapitalContributionToVenture
/ dei_LegalEntityAxis
= cik0001442626_AlexanBlaireHouseMember