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Earnings Per Share / Common Unit (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2025
Earnings Per Share Reconciliation Disclosure | The following table provides a reconciliation of both the net income attributable to BXP, Inc. and net income attributable to Boston Properties Limited Partnership and the number of common shares / units used in the computation of basic EPS, which is calculated by dividing net income attributable to BXP, Inc. or net income attributable to Boston Properties Limited Partnership by the weighted-average number of common shares / units outstanding during the period. Unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are also participating securities. As such, unvested restricted common stock of BXP and BPLP’s LTIP Units, 2012 OPP Units and MYLTIP Units are considered participating securities. Participating securities are included in the computation of basic EPS using the two-class method. Participating securities are included in the computation of diluted EPS using the if-converted method if the impact is dilutive. Because the 2012 OPP Units and 2013 - 2022 MYLTIP Units required, and the 2023 - 2025 MYLTIP Units and 2025 OPP Units require, the Company to outperform certain performance thresholds, unless such thresholds have been met by the end of the applicable reporting period, the Company excludes such units from the diluted EPS calculation. Other potentially dilutive common shares, including restricted stock and other securities of BPLP that are exchangeable for BXP’s Common Stock (See Note 2), and the related impact on earnings, are considered when calculating diluted EPS.

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- Definition Disclosure of the methodology and assumptions used in the reconciliation of earnings per share, which may include the individual income and share amount effects of all securities that affect earnings per share, the effect that has been given to preferred dividends in arriving at income available to common stockholders in computing basic earnings per share, securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic EPS in the future that were not included in the computation of diluted EPS because to do so would have been antidilutive for the period(s) presented and a description of any transaction that occurs after the end of the most recent period but before issuance of the financial statements that would have changed materially the number of common shares or potential common shares outstanding at the end of the period if the transaction had occurred before the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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