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Leases | 12 Months Ended
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Dec. 31, 2015
Leases [Abstract] |
Leases | 8. LEASES As Lessor We lease space to tenants in an office building and in retail centers. The rental terms range from approximately 5 to 25 years. The leases provide for the payment of fixed base rents payable monthly in advance as well as reimbursements of real estate taxes, insurance and maintenance costs. Retail leases may also provide for the payment by the lessee of additional rents based on a percentage of their sales. Future base rental revenue under these non-cancelable operating leases is as follows:
| (Amounts in thousands) |  |  |  |  |
| Year Ending December 31, |  | Amount |  |
| 2016 |  | $ | 139,327 |  |
| 2017 |  |  | 137,695 |  |
| 2018 |  |  | 137,799 |  |
| 2019 |  |  | 136,879 |  |
| 2020 |  |  | 133,507 |  |
| Thereafter |  |  | 950,523 |  |
These future minimum amounts do not include additional rents based on a percentage of retail tenants' sales. For the years ended December 31, 2015, 2014, and 2013, these rents were $94,000, $108,000, and $416,000, respectively. Bloomberg accounted for $94,468,000, $91,109,000 and $88,164,000, or approximately 45% of our t otal r evenues in each of the years ended December 31, 2015, 2014 and 2013, respectively. No other tenant accounted for more than 10% of our t otal r evenues. If we were to lose Bloomberg as a tenant, or if Bloomberg were to be unable to fulfill its obligations under its lease, it would adversely affect our results of operations and financial condition. In order to assist us in our continuing assessment of Bloomberg's creditworthiness, we receive certain confidential financial information and metrics from Bloomberg. In addition, we access and evaluate financial information regarding Bloomberg from other private sources, as well as publicly available data. In October 2014, Bloomberg exercised its option to extend leases that were scheduled to expire in December 2015 for a term of five years covering 192,000 square feet of office space at our 731 Lexington Avenue property. In January 2016, we entered into a lease amendment with Bloomberg which extends the lease term related to this space to be coterminous with the other 697,000 square feet of office space leased by Bloomberg through February 2029, with a ten-year extension option. In conn ection with the lease amendment, Bloomberg provided a $200,000,000 letter of credit, which amount may be reduced in certain circumstances. We may draw on this letter of credit subject to certain terms of the lease amendment, including an event of default by Bloomberg. Upon execution of the lease amendment in January 2016, an $8,916,000 leasing commission was due of which $7,200,000 was to a third party broker a nd $1,716,000 was to Vornado. As Lessee We are a tenant under a long-term ground lease at our Flushing property, which expires in 2027 and has one 10-year extension option. Future lease payments under th is operating lease, excluding the extension option, are as follows:
| (Amounts in thousands) |  |  |  |  |
| Year Ending December 31, |  | Amount |  |
| 2016 |  | $ | 700 |  |
| 2017 |  |  | 792 |  |
| 2018 |  |  | 800 |  |
| 2019 |  |  | 800 |  |
| 2020 |  |  | 800 |  |
| Thereafter |  |  | 4,866 |  |
Rent expense was $746,000 in each of the years ended December 31, 2015, 2014 and 2013.

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