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Unsecured Commercial Paper Program (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Apr. 17, 2024	Sep. 30, 2024	Dec. 31, 2023
Short-Term Debt [Line Items]
Unsecured commercial paper			$ 500,000	$ 0
Commercial Paper
Short-Term Debt [Line Items]
Commercial Paper, Maximum Borrowing Capacity		$ 500,000
Unsecured commercial paper			$ 500,000
Debt, Weighted Average Interest Rate			5.22%
Commercial Paper | Weighted Average [Member]
Short-Term Debt [Line Items]
Debt Instrument, Term	34 days
Commercial Paper | Maximum [Member]
Short-Term Debt [Line Items]
Debt Instrument, Term		1 year

X

- Definition

Commercial Paper, Maximum Borrowing Capacity

+ References

No definition available.

+ Details

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Namespace Prefix:	bxp_
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X

- Definition

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16)(a)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(a)(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

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X

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Weighted average interest rate of debt outstanding.

+ References

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- Definition

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.

+ References

No definition available.

+ Details

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- Details

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