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Rental Property - Held for Sale (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) building	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) building	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale, net	$ 2,737,000		$ 2,737,000		$ 444,000
Deferred leasing intangibles, net of accumulated amortization of $260,893 and $258,005, respectively	$ 482,672,000		$ 482,672,000		$ 499,802,000
Number of properties | building	501		501
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Long Lived Assets Held-for-sale [Line Items]
Deferred leasing intangibles, net of accumulated amortization of $260,893 and $258,005, respectively	$ 0		$ 0
Number of properties | building	1		1
Contribution to revenue	$ 100,000	$ 200,000	$ 300,000	$ 300,000
Disposal Group, Including Discontinued Operation, Operating Income (Loss)	100,000	$ 100,000	200,000	$ 100,000
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Land [Member]
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale, net	800,000		800,000
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Building and Building Improvements [Member]
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale, net	$ 1,900,000		$ 1,900,000

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- Definition

Amount of operating income (loss) attributable to disposal group, including, but not limited to, discontinued operation.

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Amount of revenue attributable to disposal group, including, but not limited to, discontinued operation.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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