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Leases | 12 Months Ended
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Dec. 31, 2017
Leases [Abstract] |
Leases | 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. We also lease residential space at The Alexander apartment tower with 1 or 2 year lease terms. Future base rental revenue under these non-cancelable operating leases is as follows:
(Amounts in thousands) |  |
Year Ending December 31, |  | Amount
2018 |  | $ | 144,712 |
2019 |  | 138,649 |
2020 |  | 136,536 |
2021 |  | 119,962 |
2022 |  | 111,533 |
Thereafter |  | 783,019 |
These future minimum amounts do not include additional rents based on a percentage of retail tenants’ sales. These rents were $174,000, $182,000 and $94,000, respectively, for the years ended December 31, 2017, 2016 and 2015. Bloomberg accounted for revenue of $105,224,000, $104,590,000 and $94,468,000, in the years ended December 31, 2017, 2016 and 2015, respectively, representing approximately 46%, 46% and 45% of our total revenues in each year, respectively. No other tenant accounted for more than 10% of our total revenues. 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. 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 this operating lease, excluding the extension option, are as follows:
(Amounts in thousands) |  |
Year Ending December 31, |  | Amount
2018 |  | $ | 800 |
2019 |  | 800 |
2020 |  | 800 |
2021 |  | 800 |
2022 |  | 800 |
Thereafter |  | 3,267 |
Rent expense was $746,000 in each of the years ended December 31, 2017, 2016 and 2015.

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