Number Of Non Employee Directors Electing To Receive Deferred Stock Units

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Separate Unrestricted Cash For Deferred Compensation Plan.

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Sum of the carrying values as of the balance sheet date of obligations incurred through that date, including liabilities incurred and payable to vendors for goods and services received, taxes, interest, rent and utilities, compensation costs, payroll taxes and fringe benefits (other than pension and postretirement obligations), contractual rights and obligations, and statutory obligations.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The amount of interest income and other income recognized during the period. Included in this element is interest derived from investments in debt securities, cash and cash equivalents, and other investments which reflect the time value of money or transactions in which the payments are for the use or forbearance of money and other income from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business).

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Percentage added to reference rate used to compute variable rate on loan receivable.

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Net rentable area for properties owned.

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For an unclassified balance sheet, amounts due from parties associated with the reporting entity as evidenced by a written promise to pay.

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of a new issue of securities classified as temporary equity that are allocated to investors for them to buy. When securities are sold on a subscription basis, the issuer does not initially receive the total proceeds. In general, the issuer does not issue the securities to the investor until it receives the entire proceeds. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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Related Party Transactions (Details) $ in Thousands	12 Months Ended
Related Party Transactions (Details) $ in Thousands	Dec. 31, 2022 USD ($) ft² nonemployeedirectors shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($)	Dec. 16, 2021 shares
Related Party Transaction [Line Items]
Related party note receivable, net	$ 78,576	$ 78,336
Interest and Other Income	$ 11,940	5,704	$ 5,953
Number Of Non Employee Directors Electing To Receive Deferred Stock Units \| nonemployeedirectors	7
Separate Unrestricted Cash For Deferred Compensation Plan.	$ 32,300	43,600
Liability for directors	$ 417,545	$ 320,775
Common stock, shares issued \| shares	156,836,767	156,623,749
Reedemable deferred stock units, units \| shares	97,853	83,073
Boston Properties Limited Partnership
Related Party Transaction [Line Items]
Related party note receivable, net	$ 78,576	$ 78,336
Interest and Other Income	11,940	5,704	5,953
Liability for directors	$ 417,545	$ 320,775
Reedemable deferred stock units, units \| shares	97,853	83,073
Three Hudson Boulevard [Member]
Related Party Transaction [Line Items]
Net Rentable Area (in sf) \| ft²	2,000,000
Ownership Percentage	25.00%
Related party note receivable, net	$ 80,000
Loans Receivable, Basis Spread on Variable Rate	3.50%
Interest and Other Income	$ 5,600	$ 3,600	2,700
Director Cessation Member [Member]
Related Party Transaction [Line Items]
Common stock, shares issued \| shares				498
Director
Related Party Transaction [Line Items]
Separate Unrestricted Cash For Deferred Compensation Plan.	600	900
Liability for directors	600	900
Immediate Family Member of Management or Principal Owner
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	0	0	914
Real Estate Brokerage Firm
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	$ 1,600	$ 1,900	$ 3,400