v3.25.4

Loans Held for Investment, net - Loan Activity (Details) $ in Thousands		12 Months Ended
	Nov. 10, 2025 USD ($) loan	Dec. 31, 2025 USD ($) loan	Dec. 31, 2024 USD ($) loan
Principal Balance
Beginning balance		$ 610,811	$ 629,892
Additional funding		6,578	12,492
Deferred interest capitalized to loans held for investment		1,008
Originations and acquisitions		211,198	133,817
Repayments		(142,010)	(165,390)
Ending balance		687,585	610,811
Unamortized Deferred Fees and Other Items
Beginning balance		(895)	(3,430)
Additional funding		0	(158)
Originations		(2,364)	(1,757)
Repayments		(708)	(594)
Net amortization of deferred fees		2,052	2,697
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Purchase Discount Accretion		37	2,347
Ending balance		(1,878)	(895)
Amortized Cost
Beginning balance		609,916	626,462
Additional funding		6,578	12,334
Deferred interest capitalized to loans held for investment		1,008
Originations		208,834	132,060
Repayments		(142,718)	(165,984)
Net amortization of deferred fees		2,052	2,697
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Purchase Discount Accretion		37	2,347
Ending balance		$ 685,707	$ 609,916
Number of loans \| loan		24	21
Purchase of Mortgage Loans
Amortized Cost
Number of loans \| loan	2
The RMR Group Inc
Amortized Cost
Purchase discount	$ 370
The RMR Group Inc \| Purchase of Mortgage Loans
Amortized Cost
Ending balance	$ 61,733
Number of loans \| loan	2

Amortization Of Deferred Loan Origination Fees Excluding Repayments, Net

+ References

No definition available.

+ Details

Name:	sevn_AmortizationOfDeferredLoanOriginationFeesExcludingRepaymentsNet
Namespace Prefix:	sevn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Investment in Mortgage Loans on Real Estate, Purchase Discount

+ References

No definition available.

+ Details

Name:	sevn_InvestmentInMortgageLoansOnRealEstatePurchaseDiscount
Namespace Prefix:	sevn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Mortgage Loan, Additional Funding, Deferred Fees And Other Items

+ References

No definition available.

+ Details

Name:	sevn_MortgageLoanAdditionalFundingDeferredFeesAndOtherItems
Namespace Prefix:	sevn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Mortgage Loan, Additional Funding, Net

+ References

No definition available.

+ Details

Name:	sevn_MortgageLoanAdditionalFundingNet
Namespace Prefix:	sevn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Mortgage Loan Repayments, Deferred Fees And Other Items

+ References

No definition available.

+ Details

Name:	sevn_MortgageLoanRepaymentsDeferredFeesAndOtherItems
Namespace Prefix:	sevn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Mortgage Loan Repayments, Gross

+ References

No definition available.

+ Details

Name:	sevn_MortgageLoanRepaymentsGross
Namespace Prefix:	sevn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Real Estate Companies, Investment In Mortgage Loans On Real Estate, Deferred Fees And Other Items

+ References

No definition available.

+ Details

Name:	sevn_RealEstateCompaniesInvestmentInMortgageLoansOnRealEstateDeferredFeesAndOtherItems
Namespace Prefix:	sevn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Deferred Interest Capitalized to Loans Held for Investment, Amortized Cost

+ References

No definition available.

+ Details

Name:	sevn_SECSchedule1229RealEstateCompaniesInvestmentInMortgageLoansOnRealEstateDeferredInterestCapitalizedToLoansHeldForInvestmentAmortizedCost
Namespace Prefix:	sevn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Deferred Interest Capitalized to Loans Held for Investment

+ References

No definition available.

+ Details

Name:	sevn_SECSchedule1229RealEstateCompaniesInvestmentInMortgageLoansOnRealEstateDeferredInterestCapitalizedToLoansHeldForInvestmentPrincipal
Namespace Prefix:	sevn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Purchase Discount Accretion

+ References

No definition available.

+ Details

Name:	sevn_SECSchedule1229RealEstateCompaniesInvestmentInMortgageLoansOnRealEstatePurchaseDiscountAccretion
Namespace Prefix:	sevn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate, Carrying Value

+ References

No definition available.

+ Details

Name:	sevn_SECSchedule1229RealEstateCompaniesInvestmentInMovementInMortgageLoansOnRealEstateCarryingValueRollForward
Namespace Prefix:	sevn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate, Deferred Fees and Other Items

+ References

No definition available.

+ Details

Name:	sevn_SECSchedule1229RealEstateCompaniesInvestmentInMovementInMortgageLoansOnRealEstateDeferredFeesAndOtherItemsRollForward
Namespace Prefix:	sevn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of decrease in investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from collection of principal.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Subsection 29
-Paragraph Column G
-Footnote 6
-Publisher SEC

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 310
-Name Accounting Standards Codification
-Section S50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478322/948-310-S50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 310
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column G)(Footnote 6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479628/948-310-S99-1

+ Details

Name:	srt_MortgageLoansOnRealEstateCollectionsOfPrincipal
Namespace Prefix:	srt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of contractual principal due at origination of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Subsection 29
-Paragraph Column F
-Publisher SEC

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 310
-Name Accounting Standards Codification
-Section S50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478322/948-310-S50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 310
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column F))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479628/948-310-S99-1

+ Details

Name:	srt_MortgageLoansOnRealEstateFaceAmountOfMortgages
Namespace Prefix:	srt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Number of mortgage loans within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Subsection 29
-Paragraph Column A
-Footnote 3
-Publisher SEC

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 310
-Name Accounting Standards Codification
-Section S50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478322/948-310-S50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 310
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column A)(Footnote 3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479628/948-310-S99-1

+ Details

Name:	srt_MortgageLoansOnRealEstateNumberOfLoans
Namespace Prefix:	srt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 310
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column G)(Footnote 3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479628/948-310-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 310
-Name Accounting Standards Codification
-Section S50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478322/948-310-S50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 310
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column G))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479628/948-310-S99-1

+ Details

Name:	us-gaap_MortgageLoansOnRealEstate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of increase in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from new investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 310
-Name Accounting Standards Codification
-Section S50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478322/948-310-S50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 310
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column G)(Footnote 6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479628/948-310-S99-1

+ Details

Name:	us-gaap_MortgageLoansOnRealEstateNewMortgageLoans
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of addition to investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, classified as other.

+ References

+ Details

Name:	us-gaap_MortgageLoansOnRealEstateOtherAdditions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of reduction in investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, classified as other.

+ References

+ Details

Name:	us-gaap_MortgageLoansOnRealEstateOtherDeductions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of increase (decrease) in investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 948
-SubTopic 310
-Name Accounting Standards Codification
-Section S50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478322/948-310-S50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 948
-SubTopic 310
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column G)(Footnote 6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479628/948-310-S99-1

+ Details

Name:	us-gaap_MortgageLoansOnRealEstatePeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	us-gaap_MovementInMortgageLoansOnRealEstateRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=sevn_PurchaseOfMortgageLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=sevn_TheRMRGroupIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Seven Hills Realty Trust 10-K