Interest and Debt Expense - Details of Interest and Debt Expense (Parenthetical) (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020
Interest And Debt Expense [Line Items]
Proceeds from notes and mortgages payable		$ 888,566,000	$ 9,791,000
1301 Avenue of the Americas [Member]
Interest And Debt Expense [Line Items]
Expense from non-cash write-off of deferred financing costs	$ 761,000	761,000
Proceeds from notes and mortgages payable	$ 860,000	$ 860,000