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Noncontrolling Interests (Narrative) (Details) - Boston Properties Limited Partnership | Jun. 30, 2020 shares
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Noncontrolling Interest [Member] |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
Operating Partnership (OP) Units (in shares) | 16,123,912
Long-Term Incentive Plan (LTIP) Units (in shares) | 1,345,723
OPP Units 2012 [Member] |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
Outperformance awards in LTIP Units (in shares) | 105,080
MYLTIP 2013 |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
2013 MYLTIP | 64,468
MYLTIP 2014 |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
2014 MYLTIP | 23,100
MYLTIP 2015 [Member] |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
2015 MYLTIP | 24,966
MYLTIP 2016 [Member] |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
2016 MYLTIP | 89,791
MYLTIP 2017 [Member] |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
2017 MYLTIP | 116,078
MYLTIP 2018 |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
2018 MYLTIP | 336,195
MYLTIP 2019 [Member] |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
2019 MYLTIPS | 220,325
MYLTIP 2020 [Member] |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
2020 MYLTIP | 203,278

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