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Subsequent Events	9 Months Ended
	Sep. 30, 2021
Subsequent Events [Abstract]
Subsequent Events	15. Subsequent Events On October 15, 2021, Boston Properties Limited Partnership used available cash and funds under its 2021 Credit Facility to complete the redemption of $1.0 billion in aggregate principal amount of its 3.85% senior notes due February 1, 2023. The redemption price was approximately $1.05 billion, which included approximately $7.9 million of accrued and unpaid interest to, but not including, the redemption date and an early redemption premium and unamortized financing costs totaling approximately $43.9 million. On October 19, 2021, the Company partially placed in-service Reston Next, a Class A office project with approximately 1.1 million net rentable square feet located in Reston, Virginia. On October 25, 2021, the Company completed the sale of its 181,191 and 201 Spring Street properties located in Lexington, Massachusetts for an aggregate gross sales price of $191.5 million. 181,191 and 201 Spring Street are three Class A office properties aggregating approximately 333,000 net rentable square feet and are 100% leased. On October 29, 2021, a joint venture in which the Company has a 50% interest fully placed in-service 7750 Wisconsin Avenue, a Class A office project with approximately 734,000 net rentable square feet located in Bethesda, Maryland.

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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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