Property Acquisitions (Details) $ in Millions	1 Months Ended
	May 31, 2019 USD ($) ft²	Jun. 30, 2019 ft²	Apr. 30, 2019 USD ($) ft²
Property Acquisitions
Approximate Square Feet | ft²		29,540,006
106 Spring Street
Property Acquisitions
Approximate Square Feet | ft²			5,928
Gross Asset Valuation (in millions)			$ 80.2
460 West 34th Street
Property Acquisitions
Approximate Square Feet | ft²	638,000
Gross Asset Valuation (in millions)	$ 440.0
Interest acquired	70.87%
Fair value adjustment	$ 67.6
Net intangible lease liabilities recognized	$ 18.3
110 Greene Street
Property Acquisitions
Approximate Square Feet | ft²	223,600
Gross Asset Valuation (in millions)	$ 256.5
Interest acquired	10.00%