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MORTGAGES NOTES PAYABLE (Details) (USD $) |  |  | 1 Months Ended | 3 Months Ended |  | 1 Months Ended
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Mar. 31, 2012 | Dec. 31, 2011 | Feb. 29, 2012 Variable Interest Rate [Member] Mortgage Notes Payable - Variable-Rate [Member] | Mar. 31, 2012 Variable Interest Rate [Member] Fund III revolving subscription line of credit [Member] Secured Credit Facilities - Variable-Rate [Member] | Mar. 31, 2012 Chicago Illinois [Member] Four Property Portfolio [Member] properties | Mar. 31, 2012 Chicago Illinois [Member] Four Property Portfolio [Member] 5.62% Mortage Note [Member] | Mar. 31, 2012 Chicago Illinois [Member] Four Property Portfolio [Member] 5.55% Mortage Note [Member] | Feb. 29, 2012 Cambridge Massachusetts [Member] Single Tenant Property [Member] 6.26% Mortage Note [Member] extension_options
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, repayments |  |  |  | $ 2,500,000 |  |  |  |
Mortgages payable | 811,700,000 | 787,910,000 | 4,300,000 | 133,600,000 |  |  |  |
Number of Properties Collateralized (in properties) |  |  |  |  | 4 |  |  |
Noncash or Part Noncash Acquisition, Debt Assumed, First Loan |  |  |  |  |  | 14,500,000 |  |
Business Acquisition, Debt Assumption Second Loan |  |  |  |  |  |  | 1,500,000 |
Interest rate |  |  |  |  |  | 5.62% | 5.55% | 6.26%
Business Acquisition, Debt Assumption |  |  |  |  |  |  |  | $ 7,000,000
Number of loan extensions (in extension options) |  |  |  |  |  |  |  | 1
Length of loan extension option |  |  |  |  |  |  |  | 5 years
LIBOR |  |  | LIBOR |  |  |  |  |
Basis Spread |  |  | 2.00% |  |  |  |  |

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- Definition Interest rate stated in the contractual 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
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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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- Definition The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 32 -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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