REAL ESTATE HELD FOR SALE AND DISCONTINUED OPERATIONS (Narrative) (Details)	Sep. 30, 2013 properties	Dec. 31, 2012 properties
Office Building [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties disposed	1	1
Industrial/Flex Property [Member] | Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties	1
Four Parcels of Partially Improved Land [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties disposed		4
Area of land		6.0