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Subsequent Events	12 Months Ended
	Dec. 31, 2020
Subsequent Events [Abstract]
Subsequent Events	18. Subsequent Events On January 29, 2021 and February 2, 2021, Boston Properties, Inc. issued an aggregate of 33,449 shares of restricted Common Stock and Boston Properties Limited Partnership issued an aggregate of 263,527 LTIP Units under the 2012 Plan to certain employees of Boston Properties, Inc. On February 2, 2021, Boston Properties, Inc.’s Compensation Committee approved the 2021 Multi-Year Long-Term Incentive Program (the “2021 MYLTIP”) awards under Boston Properties, Inc.’s 2012 Plan to certain officers and employees of Boston Properties, Inc. Earned awards will range from zero to a maximum of 352,021 LTIP Units depending on Boston Properties, Inc.’s relative and absolute TSR performance with a target of approximately 176,009 LTIP Units. Under ASC 718, the 2021 MYLTIP awards have an aggregate value of approximately $15.3 million. On February 5, 2021, the measurement period for the Company’s 2018 MYLTIP awards ended and, based on Boston Properties, Inc.’s relative TSR performance, the final awards were determined to be 29.2% of target, or an aggregate of approximately $4.6 million (after giving effect to employee separations). As a result, an aggregate of 285,925 2018 MYLTIP Units that had been previously granted were automatically forfeited. On February 14, 2021, Boston Properties Limited Partnership used available cash to complete the redemption of $850.0 million in aggregate principal amount of its 4.125% senior notes due May 15, 2021. The redemption price was approximately $858.7 million, which was equal to par plus approximately $8.7 million of accrued and unpaid interest to, but not including, the redemption date.

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- Definition

Tabular disclosure of significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, losses resulting from fire or flood, losses on receivables, significant realized and unrealized gains and losses that result from changes in quoted market prices of securities, declines in market prices of inventory, changes in authorized or issued debt (SEC), significant foreign exchange rate changes, substantial loans to insiders or affiliates, significant long-term investments, and substantial dividends not in the ordinary course of business.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662

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No definition available.

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