Property Loans, Net of Loan Loss Allowances - Summary of Partnership's Property Loans, Net of Loan Loss Allowances (Details) - USD ($)		Sep. 30, 2021	Dec. 31, 2020
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance		$ 40,313,588	$ 21,225,765
Loan Loss Allowance		(8,635,162)	(8,305,046)
Property Loan Principal, net of allowance		31,678,426	12,920,719
Avistar (February 2013 Portfolio) [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance		201,972	201,972
Property Loan Principal, net of allowance		201,972	201,972
Avistar (June 2013 Portfolio) [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance		251,622	251,622
Property Loan Principal, net of allowance		251,622	251,622
Centennial Crossings [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance	[1],[2]	3,017,729	3,017,729
Property Loan Principal, net of allowance	[1],[2]	3,017,729	3,017,729
Cross Creek [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance		11,101,887	11,101,887
Loan Loss Allowance		(7,393,814)	(7,393,814)
Property Loan Principal, net of allowance		3,708,073	3,708,073
Greens Property [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance		850,000	850,000
Property Loan Principal, net of allowance		850,000	850,000
Live 929 Apartments [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance		1,241,348	911,232
Loan Loss Allowance		(1,241,348)	(911,232)
Hilltop at Signal Hills [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance	[1],[2]	1,000,000
Property Loan Principal, net of allowance	[1],[2]	1,000,000
Ohio Properties [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance		2,390,446	2,390,446
Property Loan Principal, net of allowance		2,390,446	2,390,446
Legacy Commons at Signal Hills [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance	[1],[2]	1,000,000
Property Loan Principal, net of allowance	[1],[2]	1,000,000
Scharbauer Flats Apartments [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance	[1],[2]	3,309,613	2,309,613
Property Loan Principal, net of allowance	[1],[2]	3,309,613	2,309,613
Oasis at Twin Lakes [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance	[1],[2]	13,948,971
Property Loan Principal, net of allowance	[1],[2]	13,948,971
Osprey Village [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance	[1],[2]	1,000,000
Property Loan Principal, net of allowance	[1],[2]	1,000,000
Willow Place Apartments [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance	[1]	1,000,000
Property Loan Principal, net of allowance	[1]	$ 1,000,000
Arbors at Hickory Ridge [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance			191,264
Property Loan Principal, net of allowance			$ 191,264

[1] The property loan and associated GIL are on parity and share a first mortgage lien position on all real and personal property associated with the underlying property. Affiliates of the borrower have guaranteed limited-to-full payment of principal and accrued interest on the property loan.

[2] The property loan is held in trust in connection with a TOB financing (Note 16).