Purchase and Sale Agreement (Details) - USD ($)		1 Months Ended	3 Months Ended
	Jan. 14, 2020	Feb. 28, 2020	Jan. 31, 2020	Jan. 31, 2019
Subsequent Event [Line Items]
Escrow deposit			$ 2,876,000	$ 2,689,000
Management expenses			$ 3,382,000
Purchase and Sale Agreement Kushner Companies [Member]
Subsequent Event [Line Items]
Number of voting shares	872,812
Percentage of voting shares held	12.70%
Termination fee payable	$ 3,500,000
Purchase and Sale Agreement Kushner Companies [Member] | Maximum [Member]
Subsequent Event [Line Items]
Out-of-pocket expenses payable	$ 2,000,000
Purchase and Sale Agreement Kushner Companies [Member] | Seven Apartment Properties [Member]
Subsequent Event [Line Items]
Percentage of ownership interest	100.00%
Aggregate purchase price	$ 266,500,000
Mortgage loans assumed	76,815,000
Amount reduction	80,500,000
Total cash consideration paid	208,325,000
Purchase and Sale Agreement Kushner Companies [Member] | Seven Apartment Properties [Member] | Letter of Credit [Member]
Subsequent Event [Line Items]
Escrow deposit	$ 15,000,000
Purchase and Sale Agreement Kushner Companies [Member] | Seven Apartment Properties Except Pierre Towers and Westwood Hills [Member]
Subsequent Event [Line Items]
Percentage of ownership interest	100.00%
Purchase and Sale Agreement Kushner Companies [Member] | Pierre Towers, Hackensack [Member]
Subsequent Event [Line Items]
Percentage of ownership interest	65.00%
Aggregate purchase price	$ 80,500,000
Purchase and Sale Agreement Kushner Companies [Member] | Pierre Towers, Hackensack [Member] | Minimum [Member]
Subsequent Event [Line Items]
Aggregate purchase price		$ 186,000,000
Total cash consideration paid		156,000,000
Purchase and Sale Agreement Kushner Companies [Member] | Pierre Towers, Hackensack [Member] | Maximum [Member]
Subsequent Event [Line Items]
Aggregate purchase price		266,500,000
Total cash consideration paid		$ 208,325,000
Purchase and Sale Agreement Kushner Companies [Member] | Westwood Hills, Westwood [Member]
Subsequent Event [Line Items]
Percentage of ownership interest	40.00%
Purchase and Sale Agreement Kushner Companies [Member] | Berdan Court, Wayne [Member]
Subsequent Event [Line Items]
Aggregate purchase price	$ 42,000,000
Purchase and Sale Agreement Kushner Companies [Member] | The Regency Club, Middletown [Member]
Subsequent Event [Line Items]
Aggregate purchase price	$ 27,250,000