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Relationship with Vornado (Tables)
3 Months Ended
Mar. 31, 2015
Relationship with Vornado [Abstract]  
Summary of Fees to Vornado [Table Text Block]
   Three Months Ended 
    March 31, 
 (Amounts in thousands) 2015 2014 
 Company management fees $ 700 $ 700 
 Development fees   764   - 
 Leasing fees   382   178 
 Property management fees and payments for cleaning, engineering       
  and security services   930   870 
    $ 2,776 $ 1,748