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Real Estate (Tables)
 9 Months Ended
Sep. 30, 2018
Entity Information [Line Items]  
Schedule of Real Estate Properties [Table Text Block]
Boston Properties, Inc.
Real estate consisted of the following at September 30, 2018 and December 31, 2017 (in thousands):
 
September 30, 2018
 
December 31, 2017
Land
$
5,108,491

 
$
5,080,679

Land held for future development (1)
205,096

 
204,925

Buildings and improvements
12,949,543

 
12,284,164

Tenant improvements
2,322,552

 
2,219,608

Furniture, fixtures and equipment
44,696

 
37,928

Construction in progress
1,057,261

 
1,269,338

Total
21,687,639

 
21,096,642

Less: Accumulated depreciation
(4,838,496
)
 
(4,589,634
)
 
$
16,849,143

 
$
16,507,008

_______________
(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 September 30, 2018 and December 31, 2017 (in thousands):
 
September 30, 2018
 
December 31, 2017
Land
$
5,005,507

 
$
4,976,303

Land held for future development (1)
205,096

 
204,925

Buildings and improvements
12,646,614

 
11,977,062

Tenant improvements
2,322,552

 
2,219,608

Furniture, fixtures and equipment
44,696

 
37,928

Construction in progress
1,057,261

 
1,269,338

Total
21,281,726

 
20,685,164

Less: Accumulated depreciation
(4,741,280
)
 
(4,496,959
)
 
$
16,540,446

 
$
16,188,205

_______________
(1)
Includes pre-development costs.