Stock Option and Incentive Plan - 2025 MYLTIP (Narrative) (Details) - USD ($) $ in Thousands		12 Months Ended
Jan. 22, 2025	Dec. 31, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period		4 years
MYLTIP 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award	The 2025 MYLTIP awards consist of three components. Two of the components are each weighted 40% and utilize BXP’s TSR and BXP’s diluted Funds from Operations (“FFO”) per share growth, respectively, over a three-year measurement period as the performance metrics. The third component, weighted 20%, utilizes an average leverage ratio as the performance metric.
Vesting Period	3 years
Value of MYLTIP Awards	$ 12,700
Boston Properties Limited Partnership \| MYLTIP 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for issuance, target	177,470
Boston Properties Limited Partnership \| MYLTIP 2025 \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for issuance	0
Boston Properties Limited Partnership \| MYLTIP 2025 \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for issuance	354,940

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