Related Party Transactions - Narrative (Details)	3 Months Ended
	Mar. 31, 2019 USD ($) property	Mar. 31, 2018 USD ($)
Related Party Transaction [Line Items]
Related party expense	$ 333,000	$ 317,000
Related party - general and administrative	142,000	146,000
Real Property Management Real Estate Brokerage And Construction Supervision Services | Majestic Property Management Corporation
Related Party Transaction [Line Items]
Related party expense	8,134	10,000
Shared Services Agreement | Gould Investors Limited Partnership
Related Party Transaction [Line Items]
Related party - general and administrative	142,000	147,000
Affiliated Entity
Related Party Transaction [Line Items]
Related party expense	$ 1,023,000	908,000
Number of investments | property	3
Affiliated Entity | Payment of Acquisition Fee
Related Party Transaction [Line Items]
Related party expense	$ 421,000	$ 1,300,000