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Schedule III Real Estate Assets and Accumulated Depreciation and Amortization - Narrative (FY) (Details)	12 Months Ended
	Dec. 31, 2020 USD ($)
Real Estate [Line Items]
Aggregate cost of real estate for federal income tax purposes (unaudited)	$ 328,029,000
Tenant Improvement
Real Estate [Line Items]
Estimated useful lives (in years)	15 years
Building Improvements
Real Estate [Line Items]
Estimated useful lives (in years)	15 years
Minimum | Building
Real Estate [Line Items]
Estimated useful lives (in years)	10 years
Maximum | Building
Real Estate [Line Items]
Estimated useful lives (in years)	48 years
Maximum | Tenant Improvement
Real Estate [Line Items]
Estimated useful lives (in years)	15 years

X

- Definition

Cost basis of real estate investments for federal income tax purposes for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Footnote 6
-Subsection 28

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 970
-SubTopic 360
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-28(Footnote 6))
-URI http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024

+ Details

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X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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X

- 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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