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SUBSEQUENT EVENTS (Details) (USD $)
 1 Months Ended 1 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Apr. 30, 2012
Derivative Agreements [Member]
interest_rate_swaps
Apr. 30, 2012
Interest Rate Swap [Member]
Cash Flow Hedging [Member]
Derivative Agreements [Member]
Apr. 30, 2012
Mini Permanent Loan [Member]
Amendment of Loan [Member]
Mar. 31, 2012
Construction Loans [Member]
Apr. 30, 2012
Construction Loans [Member]
Amendment of Loan [Member]
extension_options
Apr. 30, 2012
Construction Loans [Member]
Variable Interest Rate [Member]
Amendment of Loan [Member]
Apr. 30, 2012
930 Rush Street [Member]
Chicago Illinois [Member]
Acquisition [Member]
sqft
Apr. 30, 2012
Lincoln Park Centre [Member]
Chicago Illinois [Member]
Fund III [Member]
Acquisition [Member]
sqft
Subsequent Event [Line Items]                    
Square Footage of Real Estate Property (in square feet)                 2,930 62,700
Business Acquisition, Cost of Acquired Entity, Purchase Price                 $ 20,700,000 $ 31,500,000
Business Acquisition, Debt Assumption                   19,800,000
Long-term Debt 811,700,000 787,910,000     69,600,000          
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 77,180,000         5,400,000 56,500,000      
Basis Spread               2.25%    
Number of extension options (in extension options)             2      
Period of extension options (in years)             1 year      
Number of interest rate swaps (in interest rate swaps)     2              
Notional Amount of Interest Rate Cash Flow Hedge Derivatives       $ 69,600,000            
Derivative, Fixed Interest Rate       0.70%