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Property: (Tables)
 3 Months Ended
Mar. 31, 2015
Property, Plant and Equipment [Abstract]  
Components of property
Property consists of the following:
 
March 31,
2015
 
December 31,
2014
Land
$
2,259,288

 
$
2,242,291

Buildings and improvements
9,545,712

 
9,479,337

Tenant improvements
612,411

 
600,436

Equipment and furnishings
155,285

 
152,554

Construction in progress
328,905

 
303,264

 
12,901,601

 
12,777,882

Less accumulated depreciation
(1,790,760
)
 
(1,709,992
)
 
$
11,110,841

 
$
11,067,890