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Property: (Tables)
 12 Months Ended
Dec. 31, 2013
Property, Plant and Equipment [Abstract]  
Components of property
Property at December 31, 2013 and 2012 consists of the following:
 
2013
 
2012
Land
$
1,707,005

 
$
1,572,621

Buildings and improvements
6,555,212

 
6,417,674

Tenant improvements
537,754

 
496,203

Equipment and furnishings
152,198

 
149,959

Construction in progress
229,169

 
376,249

 
9,181,338

 
9,012,706

Less accumulated depreciation
(1,559,572
)
 
(1,533,160
)
 
$
7,621,766

 
$
7,479,546