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Capital - Shares and Units and Private Perpetual Preferred Units (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	May 16, 2019
Shares and Units [Abstract]
OP units outstanding (in shares)	285,300,000
OP units owned by the Company (in shares)	171,600,000
OP units not owned by the Company (in shares)	113,700,000
Percentage of dividends on common stock received until performance criteria met for LTIP units	10.00%
Percentage of dividends on common stock received after performance criteria met for LTIP units	90.00%
Percentage of dividends on common stock received in periods after performance criteria met for LTIP units	100.00%
2019 Plan
Shares and Units [Abstract]
Number of shares authorized under the plan (in shares)	11,000,000.0		11,000,000.0
Empire State Realty OP | Empire State Realty Trust
Shares and Units [Abstract]
OP units owned by the Company (as a percent)	60.10%
Empire State Realty OP | Other partners, certain directors, member of senior management and other employees
Shares and Units [Abstract]
OP units not owned by the Company (as a percent)	39.90%
Private Perpetual Preferred Units, Series 2019
Shares and Units [Abstract]
Private perpetual preferred units, issued (in shares)	4,664,038	4,610,383
Private perpetual preferred units, liquidation preference per share (in dollars per share)	$ 13.52	$ 13.52
Cumulative cash distributions (in dollars per share)	$ 0.70
Private Perpetual Preferred Units, Series 2014
Shares and Units [Abstract]
Private perpetual preferred units, issued (in shares)	1,560,360	1,560,360
Private perpetual preferred units (in shares)	1,560,360
Private perpetual preferred units, liquidation preference per share (in dollars per share)	$ 16.62	$ 16.62
Dividend declared (in dollars per share)	$ 0.60

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