The element represents Book Value Of Real Estate Assets.

No definition available.

Name:	cik0001442626_BookValueOfRealEstateAssets
Namespace Prefix:	cik0001442626_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

the element represents Percentage Of Unpaid Outstanding Principal Balance.

+ References

No definition available.

+ Details

Name:	cik0001442626_PercentageOfUnpaidOutstandingPrincipalBalance
Namespace Prefix:	cik0001442626_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

+ Details

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

- Definition

Description of a fee associated with the debt instrument, including a commitment fee on unborrowed portions of a lender's total contractual commitment.

+ 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(b))

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

+ Details

Name:	us-gaap_DebtInstrumentFee
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ 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)(1))

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

+ Details

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

- Details

Name:	us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=cik0001442626_AriumGrandeLakesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=cik0001442626_EndersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=cik0001442626_FoxHillsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=cik0001442626_LansbrookMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=cik0001442626_ParkKingstonMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Mortgages Payable (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended	1 Months Ended	0 Months Ended	1 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 21, 2014	Mar. 16, 2015	Mar. 26, 2015	Apr. 07, 2015
Line of Credit Facility [Line Items]
Debt Instrument, Face Amount						$ 31.8us-gaap_DebtInstrumentFaceAmount
Book Value Of Real Estate Assets	352.0	288.4
Enders [Member] \| Loans Payable [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Face Amount	17.4
Debt Instrument, Interest Rate, Stated Percentage	3.97%
Enders [Member] \| Supplemental Loan [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Face Amount	8.0
Debt Instrument, Interest Rate, Stated Percentage	5.01%
Lansbrook [Member]
Line of Credit Facility [Line Items]
Secured Long-term Debt, Noncurrent	0.70		48.00
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate			4.44%
Debt Instrument, Fee			240,000
Lansbrook [Member] \| Initial Advance [Member]
Line of Credit Facility [Line Items]
Secured Long-term Debt, Noncurrent	42.00		42.00
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	4.45%
Lansbrook [Member] \| Additional borrowing [Member]
Line of Credit Facility [Line Items]
Secured Long-term Debt, Noncurrent	6.00		6.00
Lansbrook [Member] \| Additional Advance [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.31%
Secured Long-term Debt, Noncurrent	1.00
Debt Instrument, Description of Variable Rate Basis	one month LIBOR plus 3.00%
ARIUM Grande Lakes [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.84%
Debt Instrument, Description of Variable Rate Basis	Loan bears interest at a floating rate of 1.67% plus one month LIBOR
Park Kingston [Member]
Line of Credit Facility [Line Items]
Secured Long-term Debt, Noncurrent				15.25
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate				3.21%
Percentage Of Unpaid Outstanding Principal Balance				1.00%
Fox Hills [Member]
Line of Credit Facility [Line Items]
Secured Long-term Debt, Noncurrent					$ 26.70
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate					3.57%
Percentage Of Unpaid Outstanding Principal Balance					1.00%