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MORTGAGES NOTES PAYABLE (Details) (USD $) |  |  | 1 Months Ended |  | 9 Months Ended | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  |  | 1 Months Ended |  | 1 Months Ended
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Sep. 30, 2012 | Dec. 31, 2011 | Aug. 31, 2012 Mortgages | Mar. 31, 2012 Chicago Illinois Four Property Portfolio properties | Sep. 30, 2012 Secured Credit Facilities - Variable-Rate Fund III revolving subscription line of credit Line of Credit | Sep. 30, 2012 Secured Credit Facilities - Variable-Rate Fund II Line of Credit | Sep. 30, 2012 6.40% Mortgage Note Mortgages | Sep. 30, 2012 4.20% Mortgage Note Mortgages | Jun. 30, 2012 LIBOR Plus 2.95% Mortgage Note Mortgages | Jun. 30, 2012 LIBOR Plus 2.95% Mortgage Note Mortgages LIBOR | Sep. 30, 2012 LIBOR Plus 2.95% Mortgage Note Mortgages LIBOR | Jun. 30, 2012 6.35% Mortgage Note Washington, D.C. Shopping Center Mortgages | Jun. 30, 2012 Disposal Property Loan, Mortgage Note Mortgages | May 31, 2012 3.68% Mortgage Note Mortgages | Apr. 30, 2012 LIBOR Plus 2.25% Construction Loan Construction Loans extension_options | Apr. 30, 2012 LIBOR Plus 2.25% Construction Loan Construction Loans LIBOR | Apr. 30, 2012 Mortgage Notes Maturing April 2012 Mortgages | Sep. 30, 2012 Mortgage Notes Maturing April 2012 Mortgages | Apr. 30, 2012 Mortgage Notes Maturing April 2012 Chicago Illinois Lincoln Park Centre Fund III revolving subscription line of credit Mortgages | Sep. 30, 2012 LIBOR Plus 1.9% Mortgage Note Mortgages | Apr. 30, 2012 LIBOR Plus 1.9% Mortgage Note Mortgages | Sep. 30, 2012 LIBOR Plus 1.9% Mortgage Note Mortgages LIBOR | Apr. 30, 2012 LIBOR Plus 1.9% Mortgage Note Mortgages LIBOR | Sep. 30, 2012 LIBOR Plus 3.0% Mortgage Note Mortgages extension_options | Sep. 30, 2012 LIBOR Plus 3.0% Mortgage Note Mortgages LIBOR | Aug. 31, 2012 LIBOR Plus 2.25% Mortgage Note Mortgages extension_options | Aug. 31, 2012 LIBOR Plus 2.25% Mortgage Note Mortgages LIBOR | Aug. 31, 2012 1% Mortgage Note Mortgages | Aug. 31, 2012 LIBOR Plus Three Point Three Percent Construction Line of Credit [Member] Construction Loans | Aug. 31, 2012 LIBOR Plus Three Point Three Percent Construction Line of Credit [Member] Construction Loans LIBOR | Jul. 31, 2012 LIBOR Plus Three Point Three-Five Percent Mortgage Note [Member] Mortgages | Jul. 31, 2012 LIBOR Plus Three Point Three-Five Percent Mortgage Note [Member] Mortgages LIBOR | Mar. 31, 2012 5.62% Mortage Note Chicago Illinois Four Property Portfolio Mortgages | Mar. 31, 2012 5.55% Mortage Note Chicago Illinois Four Property Portfolio Mortgages | Feb. 29, 2012 6.26% Mortage Note Cambridge Massachusetts Single Tenant Property Mortgages | Feb. 29, 2012 Mortgage Notes Payable - Variable-Rate Mortgages LIBOR
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, repayments |  |  |  |  | $ 53,100,000 | $ 7,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, amount outstanding |  |  |  |  | 82,900,000 | 32,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Refinanced Amount |  |  |  |  |  |  | 7,800,000 |  |  |  |  |  |  |  | 56,500,000 |  |  |  |  |  |  |  |  | 83,300,000 |  |  |  |  |  |  | 11,500,000 |  |  |  |  |
Mortgages payable, face amount |  |  |  |  |  |  | 8,000,000 |  | 22,800,000 |  |  |  |  | 4,300,000 | 69,600,000 |  |  |  |  | 6,400,000 | 15,500,000 |  |  |  |  | 21,000,000 |  | 20,000,000 | 50,000,000 |  | 10,600,000 |  |  |  |  |
Long-term Debt, Intercompany Elimination |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,800,000 |  |  |  |  |  |  |  |
Mortgages payable | 871,243,000 | 767,150,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 73,900,000 |  |  |  |  |  |  |  |  |  | 5,200,000 |  |  |  |  |  |  |  |
Business Acquisition, Debt Assumption |  |  |  |  |  |  |  |  |  |  |  | 16,500,000 |  |  |  |  |  |  | 19,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,500,000 | 1,500,000 | 7,000,000 |
Interest rate |  |  |  |  |  |  | 6.40% | 4.20% |  |  |  | 6.35% |  | 3.68% |  |  |  |  | 5.85% |  |  |  |  |  |  |  |  | 1.00% |  |  | 7.34% |  | 5.62% | 5.55% | 6.26% |
Repayments of Long-term Debt |  |  | 12,500,000 |  |  |  |  |  |  |  |  |  | 8,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Increase, Additional Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Properties Collateralized (in properties) |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loan extensions (in extension options) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  | 2 |  | 2 |  |  |  |  |  |  |  |  |  |
Length of loan extension option |  |  |  |  |  |  |  |  | 1 year |  |  |  |  | 5 years | 1 year |  |  |  |  |  |  |  |  | 1 year |  | 1 year |  |  |  |  |  |  |  |  | 5 years |
LIBOR |  |  |  |  |  |  |  |  |  | LIBOR |  |  |  |  |  | LIBOR |  |  |  |  |  | LIBOR | LIBOR |  | LIBOR |  | LIBOR |  |  | LIBOR |  | LIBOR |  |  |  | LIBOR
Basis Spread |  |  |  |  |  |  |  |  |  |  | 2.95% |  |  |  |  | 2.25% |  |  |  |  |  | 1.90% | 1.90% |  | 3.00% |  | 2.25% |  |  | 3.30% |  | 3.35% |  |  |  | 2.00%

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