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Real Estate - Tenant Reimbursements (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Real Estate [Abstract] |  |  |  |
Tenant expense reimbursements | $ 0.4 | $ 0.4 | $ 0.8 | $ 0.8

X
- Definition Tenant Expense Reimbursements + References No definition available. + Details
Name: | stho_TenantExpenseReimbursements
Namespace Prefix: | stho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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