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MORTGAGES NOTES PAYABLE (Details) (USD $) |  |  |  | 3 Months Ended |  | 6 Months Ended | 1 Months Ended |  | 1 Months Ended
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Jun. 30, 2012 | Dec. 31, 2011 | Mar. 31, 2012 Chicago Illinois Four Property Portfolio properties | Mar. 31, 2012 Secured Credit Facilities - Variable-Rate Fund III revolving subscription line of credit Line of Credit | Jun. 30, 2012 Secured Credit Facilities - Variable-Rate Fund III revolving subscription line of credit Line of Credit | Jun. 30, 2012 Secured Credit Facilities - Variable-Rate Fund II Line of Credit | Jun. 30, 2012 LIBOR Plus 2.95% Mortgage Note Mortgages | Jun. 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 [Member] Mortgages | Apr. 30, 2012 Mortgage Notes Maturing April 2012 [Member] Chicago Illinois Lincoln Park Centre Fund III revolving subscription line of credit Mortgages | Apr. 30, 2012 LIBOR Plus 1.9% Mortgage Note Mortgages | Apr. 30, 2012 LIBOR Plus 1.9% Mortgage Note 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 extension_options | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgages payable | 853,924,000 | 779,650,000 |  |  |  |  | 22,800,000 |  |  |  | 4,300,000 | 69,600,000 |  | 73,900,000 |  | 15,500,000 |  |  |  |  |
Business Acquisition, Debt Assumption |  |  |  |  |  |  |  |  | 16,500,000 |  |  |  |  |  | 19,800,000 |  |  | 14,500,000 | 1,500,000 | 7,000,000 |
Interest rate |  |  |  |  |  |  |  |  | 6.35% |  | 3.68% |  |  |  | 5.85% |  |  | 5.62% | 5.55% | 6.26% |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  | 8,300,000 |  |  |  |  |  |  |  |  |  |  |
Long Term Debt, Debt Replaced by New Debt |  |  |  |  |  |  |  |  |  |  |  | 56,500,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Increase, Additional Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,600,000 |  |  |  |  |  |  |
Number of Properties Collateralized (in properties) |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loan extensions (in extension options) |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  | 1 |
Length of loan extension option |  |  |  |  |  |  | 1 year |  |  |  | 5 years | 1 year |  |  |  |  |  |  |  | 5 years |
LIBOR |  |  |  |  |  |  |  | LIBOR |  |  |  |  | LIBOR |  |  |  | LIBOR |  |  |  | LIBOR
Basis Spread |  |  |  |  |  |  |  | 2.95% |  |  |  |  | 2.25% |  |  |  | 1.90% |  |  |  | 2.00%

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- Definition Decrease for amounts repaid on the debt instrument for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 4 -Section 08 -Paragraph f Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 + Details
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- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any. + 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 FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 16 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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