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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