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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2018
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):
2019 |  |  | $ | 1,518 |
2020 |  |  | 1,518 |
2021 |  |  | 1,518 |
2022 |  |  | 1,518 |
2023 |  |  | 1,518 |
Thereafter |  |  | 68,298 |
Total |  |  | $ | 75,888 |
Summary of Percent of Total Rental Revenue | For the years ended December 31, 2018, 2017 and 2016, 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,
|  | 2018 |  | 2017 |  | 2016
Empire State Building |  | 31.9 | % |  | 32.0 | % |  | 32.6 | %
One Grand Central Place |  | 12.8 | % |  | 13.1 | % |  | 12.5 | %
111 West 33rd Street |  | 9.3 | % |  | 8.6 | % |  | 6.8 | %
1400 Broadway |  | 7.1 | % |  | 7.4 | % |  | 7.8 | %
First Stamford Place |  | 5.9 | % |  | 5.4 | % |  | 6.4 | %
250 West 57th Street |  | 5.2 | % |  | 5.2 | % |  | 5.3 | %
Schedule of Contributions to Multiemployer Plans | Contributions we made to the multi-employer plans for the years ended December 31, 2018, 2017 and 2016 are included in the table below (amounts in thousands):
|  | For the Year Ended December 31,
Benefit Plan |  | 2018 |  | 2017 |  | 2016
Pension Plans (pension and annuity)* |  | $ | 3,327 |  |  | $ | 3,035 |  |  | $ | 3,155 |
Health Plans** |  | 9,373 |  |  | 8,551 |  |  | 8,280 |
Other*** |  | 814 |  |  | 856 |  |  | 542 |
Total plan contributions |  | $ | 13,514 |  |  | $ | 12,442 |  |  | $ | 11,977 |
* | Pension plans include $1.0 million, $0.9 million and $0.8 million for the years ended 2018, 2017 and 2016, respectively, to multiemployer plans not discussed above.
** Health plans include $1.6 million, $1.6 million and $1.6 million for the years ended 2018, 2017 and 2016, 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 2018, 2017 and 2016, respectively, in connection with other multiemployer plans not discussed above.

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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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- Definition Tabular disclosure of the quantitative and qualitative information related to multiemployer plans in which the employer participates. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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