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Real Estate Real Estate (Tables)
 6 Months Ended
Jun. 30, 2017
Entity Information [Line Items]  
Schedule of Real Estate Properties [Table Text Block]
Boston Properties, Inc.
Real estate consisted of the following at June 30, 2017 and December 31, 2016 (in thousands):
 
June 30, 2017
 
December 31, 2016
Land
$
4,880,337

 
$
4,879,020

Land held for future development (1)
250,451

 
246,656

Buildings and improvements
11,960,865

 
11,890,626

Tenant improvements
2,136,739

 
2,060,315

Furniture, fixtures and equipment
37,136

 
32,687

Construction in progress
1,348,838

 
1,037,959

Total
20,614,366

 
20,147,263

Less: Accumulated depreciation
(4,379,446
)
 
(4,222,235
)
 
$
16,234,920

 
$
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 June 30, 2017 and December 31, 2016 (in thousands):
 
June 30, 2017
 
December 31, 2016
Land
$
4,775,961

 
$
4,774,460

Land held for future development (1)
250,451

 
246,656

Buildings and improvements
11,653,196

 
11,581,795

Tenant improvements
2,136,739

 
2,060,315

Furniture, fixtures and equipment
37,136

 
32,687

Construction in progress
1,348,838

 
1,037,959

Total
20,202,321

 
19,733,872

Less: Accumulated depreciation
(4,290,112
)
 
(4,136,364
)
 
$
15,912,209

 
$
15,597,508

_______________
(1)
Includes pre-development costs.
MacArthur Transit Center [Member]  
Entity Information [Line Items]  
Capital Leases in Financial Statements of Lessee Disclosure [Text Block]
As of June 29, 2017, future minimum lease payments related to this capital lease are as follows (in thousands):
Period from June 29, 2017 through December 31, 2017
$
5

2018
10

2019
10

2020
10

2021
13

Thereafter
38,778

Total expected minimum obligations
38,826

Interest portion
(9,864
)
Present value of net expected minimum payments
$
28,962
103 Carnegie Center [Member]  
Entity Information [Line Items]  
Schedule of Business Acquisitions, by Acquisition [Table Text Block]
Land
$
2,890

Building and improvements
11,229

Tenant improvements
871

In-place lease intangibles
2,389

Below-market lease intangible
(1,426
)
Net assets acquired
$
15,953
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]
 
Acquired In-Place
Lease Intangibles  
 
Acquired Below-
Market Lease Intangibles  
Period from May 15, 2017 through December 31, 2017
$
660

 
$
(248
)
2018
590

 
(363
)
2019
367

 
(337
)
2020
243

 
(308
)
2021
96

 
(105
)