Fair Value Measurement Financial Instruments (Details Textual) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Mortgage payable (Note 7)	$ 96,099,690	$ 0
Mortgage Payable At Fair Value	$ 97,700,000

This amount represents the fair value of mortgage payable at the balance sheet date.

No definition available.

Name:	cik0001442626_MortgagePayableAtFairValue
Namespace Prefix:	cik0001442626_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant