Mortgages Payable (Details Textual) (USD $)	12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended
Dec. 31, 2009 Spring House [Member]	Dec. 03, 2009 Spring House [Member]	Dec. 31, 2010 Creekside [Member]	Oct. 13, 2010 Creekside [Member]	Dec. 31, 2012 Enders [Member]	Oct. 02, 2012 Enders [Member]	Dec. 31, 2012 Mda [Member]	Dec. 17, 2012 Mda [Member]
Secured Long-term Debt, Noncurrent		$ 23,400,000		$ 12,972,200		$ 17,500,000		$ 37,600,000
Debt Instrument, Maturity Date	Jan. 01, 2020		Nov. 01, 2050		Nov. 01, 2022		Jan. 01, 2023
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate		5.66%		4.60%		3.97%		5.35%
Long-term Debt, Percentage Bearing Fixed Interest, Amount						$ 83,245		$ 209,964
Percentage Of Prepayment Premium	1.00%		8.00%		1.00%		1.00%
Percentage Reduction In Prepayment Premium			1.00%

This element represents Prepayment Premium on secured loan, including the percentage and payment requirements.

No definition available.

Name:	cik0001442626_PercentageOfPrepaymentPremium
Namespace Prefix:	cik0001442626_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage reduction in prepayment premium.

+ References

No definition available.

+ Details

Name:	cik0001442626_PercentageReductionInPrepaymentPremium
Namespace Prefix:	cik0001442626_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

No definition available.

+ Details

Name:	us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

+ Details

Name:	us-gaap_LongTermDebtPercentageBearingFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

+ Details

Name:	us-gaap_SecuredLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant