Investments in Real Estate - Investments in Existing Properties (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Investments in real estate properties
Improvements	$ 65,373,623
Investments in Existing Properties
Investments in real estate properties
Improvements	17,900,000	$ 17,900,000
Re-leasing costs	2,100,000	3,900,000
Recurring capital expenditures	801,000	1,100,000
Nonrecurring building improvements	$ 15,000,000.0	$ 12,900,000