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SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2012
item
Dec. 31, 2011
Dec. 31, 2010
Revenue Recognition      
Additional rental income for the reimbursement of expenses $ 947,000 $ 794,000 $ 496,000
Purchase Accounting for Acquisition of Real Estate      
Estimated useful lives of building and intangible assets, minimum 1 year    
Estimated useful lives of building and intangible assets, maximum 35 years    
Escrow, Deposits and Other Assets and Receivables      
Restricted cash relating to real estate taxes, insurance and other escrows 1,104,000 999,000  
Allowance for Doubtful Accounts      
Balance in allowance for doubtful accounts 132,000 335,000  
Amount written off 86,000 1,109,000  
Number of tenants from whom the doubtful collections were received 1    
Continuing operations
      
Allowance for Doubtful Accounts      
Bad debt expense 56,000 486,000 432,000
Discontinued operations
      
Allowance for Doubtful Accounts      
Bad debt expense   (19,000) 93,000
Net recoveries of bad debt $ 173,000