Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2020

Commitments and Contingencies Disclosure [Abstract]

Summary of Percent of Total Rental Revenue

For the years ended December 31, 2020, 2019 and 2018, the six properties listed below accounted for the indicated percentage of total rental revenues. No other property accounted for more than 5.0% of total rental revenues.

	Year Ended December 31,
	2020		2019		2018
Empire State Building	32.8	%	32.9	%	31.9	%
One Grand Central Place	12.4	%	12.3	%	12.8	%
111 West 33rd Street	10.5	%	9.9	%	9.3	%
1400 Broadway	8.0	%	7.1	%	7.1	%
250 West 57th Street	5.7	%	5.5	%	5.2	%
First Stamford Place	5.4	%	5.4	%	5.9	%

Schedule of Contributions to Multiemployer Plans

Contributions we made to the multi-employer plans for the years ended December 31, 2020, 2019 and 2018 are included in the table below (amounts in thousands):

	For the Year Ended December 31,
Benefit Plan	2020		2019		2018
Pension Plans (pension and annuity)*	$	2,383	$	3,418	$	3,327
Health Plans**	6,873		10,055		9,373
Other***	416		641		814
Total plan contributions	$	9,672	$	14,114	$	13,514

*    Pension plans include $0.8 million, $1.0 million and $1.0 million for the years ended 2020, 2019 and 2018, respectively, to multiemployer plans not discussed above.

** Health plans include $1.4 million, $1.8 million and $1.6 million for the years ended 2020, 2019 and 2018, respectively, to multiemployer plans not discussed above.

*** Other consists of union costs which were not itemized between pension and health plans. Other includes $0.3 million, $0.4 million and $0.2 million for the years ended 2020, 2019 and 2018, respectively, in connection with other multiemployer plans not discussed above.