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Property: (Tables)
 9 Months Ended
Sep. 30, 2013
Property, Plant and Equipment [Abstract]  
Components of property
Property consists of the following:
 
September 30,
2013
 
December 31,
2012
Land
$
1,751,611

 
$
1,572,621

Buildings and improvements
6,642,696

 
6,417,674

Tenant improvements
554,528

 
496,203

Equipment and furnishings
153,146

 
149,959

Construction in progress
239,106

 
376,249

 
9,341,087

 
9,012,706

Less accumulated depreciation
(1,607,158
)
 
(1,533,160
)
 
$
7,733,929

 
$
7,479,546