Related Party Transactions - Property Management and Board of Trustee Fees (Details) - GOLDMARK Property Management - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021
Related Party Transactions
Management fee, amount paid	$ 10,485	$ 9,634
Management fees paid expressed as a percentage of net collected rents	5.00%	5.00%
Management fees as percent of net collected rents	$ 4,107	$ 3,862
Repair and maintenance related payroll and payroll related expenses	$ 5,578	$ 5,012

The amount of property management fees as percent of net collected rents.

No definition available.

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Namespace Prefix:	sret_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the related party transaction representing expenses incurred for repair and maintenance related payroll and payroll related expenses.

+ References

No definition available.

+ Details

Name:	sret_RelatedPartyTransactionRepairAndMaintenanceRelatedPayrollExpenses
Namespace Prefix:	sret_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of expenses related to the managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

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

- Definition

The percentage charged for managing real estate properties.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyManagementFeePercentFee
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- 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

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

- Details

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Namespace Prefix:
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Balance Type:
Period Type: