XML 59 R37.htm IDEA: XBRL DOCUMENT
v3.25.4

Debt (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2025
Debt Disclosure [Abstract] |
Schedule Of Aggregate Principal Payments On Mortgage Notes | Contractual aggregate principal payments of mortgage notes payable at December 31, 2025 are as follows (in thousands):
| Principal Payments
2026 | $ | 4,357 |
2027 | 2,304,580 |
2028 | 804,815 |
2029 | 184,311 |
2030 | — |
Thereafter | 1,000,000 |
Total aggregate principal payments | 4,298,063 |
Less: |
Deferred financing costs, net | 17,996 |
Total carrying value of mortgage notes payable, net | $ | 4,280,067 |
Schedule of Long-term Debt Instruments | The following summarizes the unsecured senior notes outstanding as of December 31, 2025 (dollars in thousands):
| Coupon/Stated Rate |  | Effective Rate(1) |  | Principal Amount |  | Maturity Date(2)
10 Year Unsecured Senior Notes (3) | 3.650 | % |  | 3.766 | % |  | $ | 1,000,000 |  |  | February 1, 2026
10 Year Unsecured Senior Notes | 2.750 | % |  | 3.495 | % |  | 1,000,000 |  |  | October 1, 2026
5 Year Unsecured Senior Notes | 6.750 | % |  | 6.924 | % |  | 750,000 |  |  | December 1, 2027
10 Year Unsecured Senior Notes | 4.500 | % |  | 4.628 | % |  | 1,000,000 |  |  | December 1, 2028
10 Year Unsecured Senior Notes | 3.400 | % |  | 3.505 | % |  | 850,000 |  |  | June 21, 2029
10.5 Year Unsecured Senior Notes | 2.900 | % |  | 2.984 | % |  | 700,000 |  |  | March 15, 2030
10.75 Year Unsecured Senior Notes | 3.250 | % |  | 3.343 | % |  | 1,250,000 |  |  | January 30, 2031
11 Year Unsecured Senior Notes | 2.550 | % |  | 2.671 | % |  | 850,000 |  |  | April 1, 2032
12 Year Unsecured Senior Notes | 2.450 | % |  | 2.524 | % |  | 850,000 |  |  | October 1, 2033
10.7 Year Unsecured Senior Notes | 6.500 | % |  | 6.619 | % |  | 750,000 |  |  | January 15, 2034
10 Year Unsecured Senior Notes | 5.750 | % |  | 5.842 | % |  | 850,000 |  |  | January 15, 2035
Total principal |  |  |  |  | 9,850,000 |  |  |
Less: |  |  |  |  |  |  |
Net unamortized discount |  |  |  |  | 8,371 |  |  |
Deferred financing costs, net |  |  |  |  | 35,529 |  |  |
Total |  |  |  |  | $ | 9,806,100 |  |  |
_______________ (1)Yield on issuance date including the effects of discounts on the notes, settlements of interest rate contracts and the amortization of financing costs. (2)No principal amounts are due prior to maturity. (3)See Note 17.

X
- Definition bxp_ScheduleOfAggregatePrincipalPaymentsOnMortgageNotesTableTextBlock + References No definition available. + Details
Name: | bxp_Bxp_ScheduleOfAggregatePrincipalPaymentsOnMortgageNotesTableTextBlockTableTextBlock
Namespace Prefix: | bxp_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477314/942-235-S99-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-4 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69B -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69B Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69E -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69E Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-2 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-3 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477734/942-470-50-3 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-8 Reference 11: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-6 Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-7 + Details
Name: | us-gaap_ScheduleOfDebtInstrumentsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration