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Property: (Tables)
6 Months Ended
Jun. 30, 2013
Property:  
Components of property

  June 30,
2013
  December 31,
2012
 

Land

  $ 1,689,899   $ 1,572,621  

Buildings and improvements

    6,530,904     6,417,674  

Tenant improvements

    512,875     496,203  

Equipment and furnishings

    149,129     149,959  

Construction in progress

    466,308     376,249  
           

 

    9,349,115     9,012,706  

Less accumulated depreciation

    (1,570,330 )   (1,533,160 )
           

 

  $ 7,778,785   $ 7,479,546