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Real Estate Real Estate (Tables)
 3 Months Ended
Mar. 31, 2017
Entity Information [Line Items]  
Schedule of Real Estate Properties [Table Text Block]
Boston Properties, Inc.
Real estate consisted of the following at March 31, 2017 and December 31, 2016 (in thousands):
 
March 31, 2017
 
December 31, 2016
Land
$
4,879,015

 
$
4,879,020

Land held for future development (1)
249,800

 
246,656

Buildings and improvements
11,904,196

 
11,890,626

Tenant improvements
2,111,336

 
2,060,315

Furniture, fixtures and equipment
36,589

 
32,687

Construction in progress
1,211,324

 
1,037,959

Total
20,392,260

 
20,147,263

Less: Accumulated depreciation
(4,302,283
)
 
(4,222,235
)
 
$
16,089,977

 
$
15,925,028

_______________
(1)
Includes pre-development costs.
Boston Properties Limited Partnership  
Entity Information [Line Items]  
Schedule of Real Estate Properties [Table Text Block]
Boston Properties Limited Partnership
Real estate consisted of the following at March 31, 2017 and December 31, 2016 (in thousands):
 
March 31, 2017
 
December 31, 2016
Land
$
4,774,455

 
$
4,774,460

Land held for future development (1)
249,800

 
246,656

Buildings and improvements
11,595,365

 
11,581,795

Tenant improvements
2,111,336

 
2,060,315

Furniture, fixtures and equipment
36,589

 
32,687

Construction in progress
1,211,324

 
1,037,959

Total
19,978,869

 
19,733,872

Less: Accumulated depreciation
(4,214,265
)
 
(4,136,364
)
 
$
15,764,604

 
$
15,597,508

_______________
(1)
Includes pre-development costs.