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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Percent of Total Rental Revenue For the years ended December 31, 2021, 2020 and 2019, 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,
202120202019
Empire State Building31.7 %32.8 %32.9 %
One Grand Central Place12.6 %12.4 %12.3 %
111 West 33rd Street11.3 %10.5 %9.9 %
1400 Broadway8.9 %8.0 %7.1 %
250 West 57th Street5.8 %5.7 %5.5 %
First Stamford Place5.2 %5.4 %5.4 %
Schedule of Contributions to Multiemployer Plans
Contributions we made to the multi-employer plans for the years ended December 31, 2021, 2020 and 2019 are included in the table below (amounts in thousands):
For the Year Ended December 31,
Benefit Plan202120202019
Pension Plans (pension and annuity)*
$2,165 $2,383 $3,418 
Health Plans** 6,214 6,873 10,055 
Other*** 305 416 641 
Total plan contributions
$8,684 $9,672 $14,114 
*    Pension plans include $0.7 million, $0.8 million and $1.0 million for the years ended 2021, 2020 and 2019, respectively, to multiemployer plans not discussed above.
** Health plans include $1.4 million, $1.4 million and $1.8 million for the years ended 2021, 2020 and 2019, respectively, to multiemployer plans not discussed above.
*** Other consists of union costs which were not itemized between pension and health plans. Other includes $0.2 million, $0.3 million and $0.4 million for the years ended 2021, 2020 and 2019, respectively, in connection with other
multiemployer plans not discussed above.