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Stock Option and Incentive Plan (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 07, 2023 | Feb. 03, 2023 | Feb. 04, 2022 | May 20, 2021 | Feb. 05, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting Period |  |  |  |  |  | 4 years |  |  |
Stock Issued During Period, Shares, Share-based Compensation, Forfeited |  |  |  |  |  | (103,641) |  |  |
Weighted Average Exercise Price |  |  |  |  |  | $ 0 | $ 97.01 | $ 97.01 | $ 96.97
2021 Stock Incentive Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Plan Expiration Period |  |  |  | 10 years |  |  |  |  |
MYLTIP 2023 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award | The 2023 MYLTIP awards consist of two, equally weighted (50% each) components that utilize BXP’s TSR over a three-year measurement period as the performance metrics. |  |  |  |  |  |  |  |
Distributions percent before measurement date | 10.00% |  |  |  |  |  |  |  |
Vesting Period | 3 years |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights | Earned awards (if any) will vest 100% on February 6, 2026, but, in general, may not be converted, redeemed, sold or otherwise transferred for one additional year thereafter. |  |  |  |  |  |  |  |
Value of MYLTIP Awards | $ 13,100 |  |  |  |  |  |  |  |
MYLTIP 2020 [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Value of MYLTIP Awards |  | $ 3,800 |  |  |  |  |  |  |
Final awards percentage of target |  | 50.00% |  |  |  |  |  |  |
Forfeitures, in units |  | 152,460 |  |  |  |  |  |  |
MYLTIP 2019 [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Value of MYLTIP Awards |  |  | $ 8,600 |  |  |  |  |  |
Final awards percentage of target |  |  | 69.00% |  |  |  |  |  |
Forfeitures, in units |  |  | 144,043 |  |  |  |  |  |
stock option |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted |  |  |  |  |  | 0 | 0 | 0 |
MYLTIP 2018 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Value of MYLTIP Awards |  |  |  |  | $ 4,600 |  |  |  |
Final awards percentage of target |  |  |  |  | 29.20% |  |  |  |
Forfeitures, in units |  |  |  |  | 285,925 |  |  |  |
Employee Stock |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock available for issuance |  |  |  |  |  | 250,000 |  |  |
Employee discount |  |  |  |  |  | 85.00% |  |  |
Weighted Average Price of Shares Purchased |  |  |  |  |  | $ 51.93 | $ 87.30 | $ 89.73 |
Minimum [Member] | MYLTIP 2023 | Boston Properties Limited Partnership |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock available for issuance | 0 |  |  |  |  |  |  |  |
Maximum [Member] | 2021 Stock Incentive Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock available for issuance |  |  |  | 5,400,000 |  |  |  |  |
Maximum [Member] | MYLTIP 2023 | Boston Properties Limited Partnership |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock available for issuance | 322,053 |  |  |  |  |  |  |  |
Target | MYLTIP 2023 | Boston Properties Limited Partnership |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock available for issuance | 161,026 |  |  |  |  |  |  |  |

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