Related Party Transactions - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) property	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) property	Sep. 30, 2018 USD ($)
Related Party Transaction [Line Items]
Related party expense	$ 332,000	$ 317,000	$ 998,000	$ 951,000
Related party - general and administrative	105,000	109,000	403,000	416,000
Real Property Management Real Estate Brokerage And Construction Supervision Services | Majestic Property Management Corporation
Related Party Transaction [Line Items]
Related party expense	9,000	8,000	25,000	24,000
Shared Services Agreement | Gould Investors Limited Partnership
Related Party Transaction [Line Items]
Related party - general and administrative	105,000	109,000	402,000	416,000
Affiliated Entity
Related Party Transaction [Line Items]
Related party expense	$ 1,074,000	976,000	$ 3,187,000	2,810,000
Number of investments | property	3		3
Affiliated Entity | Payment of Acquisition Fee
Related Party Transaction [Line Items]
Related party expense	$ 25,000	$ 0	$ 876,000	$ 1,813,000