CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues:
Office revenues	$ 28,830,000	$ 29,941,000	$ 15,607,000
Dividend income from real estate equity securities	418,000	196,000	0
Interest income from real estate loan receivable	0	10,000	387,000
Total revenues	68,741,000	70,282,000	51,968,000
Expenses:
Office expenses	13,705,000	12,322,000	5,372,000
Asset management fees to affiliate	4,093,000	3,985,000	2,775,000
General and administrative expenses	3,475,000	2,866,000	3,199,000
Depreciation and amortization	20,236,000	20,405,000	14,429,000
Interest expense	19,876,000	14,663,000	8,814,000
Impairment charges on real estate	0	14,745,000	0
Total expenses	87,709,000	95,672,000	57,400,000
Other (loss) income:
Other interest income	305,000	367,000	514,000
Equity in income of unconsolidated entity	2,800,000	339,000	54,000
Gain (loss) on real estate equity securities	2,704,000	(1,924,000)	0
Casualty-related income, net	0	0	1,614,000
Gain on sale of real estate	4,178,000	0	0
Loss on extinguishment of debt	(105,000)	0	0
Total other income (loss)	9,882,000	(1,218,000)	2,182,000
Net loss before income taxes	(9,086,000)	(26,608,000)	(3,250,000)
Income tax benefit (expense)	0	9,000	(48,000)
Net loss	(9,086,000)	(26,599,000)	(3,298,000)
Net loss attributable to noncontrolling interests	1,587,000	3,091,000	26,000
Net loss attributable to common stockholders	(7,499,000)	(23,508,000)	(3,272,000)
Hotel
Revenues:
Revenue from contract with customer	31,381,000	32,666,000	28,994,000
Expenses:
Expenses	22,770,000	22,907,000	19,187,000
Apartment
Revenues:
Revenue from contract with customer	8,112,000	7,469,000	6,980,000
Expenses:
Expenses	3,554,000	3,779,000	3,624,000
Common Class A
Other (loss) income:
Net loss attributable to common stockholders	$ (4,458,000)	$ (13,729,000)	$ (1,480,000)
Net loss per common share, basic and diluted (in dollars per share)	$ (0.25)	$ (0.77)	$ (0.09)
Weighted-average number of common shares outstanding, basic and diluted (in shares)	17,949,301	17,775,503	16,096,216
Common Class T
Other (loss) income:
Net loss attributable to common stockholders	$ (3,041,000)	$ (9,779,000)	$ (1,792,000)
Net loss per common share, basic and diluted (in dollars per share)	$ (0.25)	$ (0.82)	$ (0.18)
Weighted-average number of common shares outstanding, basic and diluted (in shares)	12,241,271	11,864,178	9,797,325