Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Lease Payments

Future minimum lease payments to be paid over the terms of the leases are as follows (amounts in thousands):

2018	$	1,518
2019	1,518
2020	1,518
2021	1,518
2022	1,518
Thereafter	53,694
Total	$	61,284

Summary of Percent of Total Rental Revenue

For the years ended December 31, 2017, 2016 and 2015, 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,
	2017		2016		2015
Empire State Building	32.0	%	32.6	%	31.4	%
One Grand Central Place	13.1	%	12.5	%	12.2	%
111 West 33rd Street	8.6	%	6.8	%	8.3	%
1400 Broadway	7.4	%	7.8	%	7.7	%
First Stamford Place	5.4	%	6.4	%	6.5	%
250 West 57th Street	5.2	%	5.3	%	4.8	%

Schedule of Contributions to Multiemployer Plans

Contributions we made to the multi-employer plans for the years ended December 31, 2017, 2016 and 2015 are included in the table below (amounts in thousands):

	For the Year Ended December 31,
Benefit Plan	2017		2016		2015
Pension Plans (pension and annuity)*	$	3,035	$	3,155	$	3,077
Health Plans**	8,551		8,280		8,296
Other***	856		542		619
Total plan contributions	$	12,442	$	11,977	$	11,992

* Pension plans include $0.9 million, $0.8 million and $0.7 million for the years ended 2017, 2016 and 2015, respectively, to multiemployer plans not discussed above.

** Health plans include $1.6 million, $1.6 million and $1.4 million for the years ended 2017, 2016 and 2015, 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, $0.2 million and $0.2 million for the years ended 2017, 2016 and 2015, respectively, in connection with other multiemployer plans not discussed above.