(11) Commitments and Contingencies

Leases

Skyhook leases various properties under operating leases expiring at various times through 2021. The aggregate minimum annual lease payments under the noncancelable operating leases as of December 31, 2018 are as follows (amounts in thousands):

Skyhook’s two principal facilities are under lease through December 2019 and December 2020, respectively. Total rental expense for the years ended December 31, 2018,  2017 and 2016 was $1.0 million, $1.1 million and $2.4 million, respectively.

General Litigation

In the ordinary course of business, the Company and its consolidated subsidiaries are parties to legal proceedings and claims involving alleged infringement of third-party intellectual property rights, defamation, and other claims. Although it is reasonably possible that the Company may incur losses upon conclusion of such matters, an estimate of any loss or range of loss cannot be made. In the opinion of management, it is expected that amounts, if any, which may be required to satisfy such contingencies will not be material in relation to the accompanying consolidated financial statements.

Off-Balance Sheet Arrangements

Liberty Broadband did not have any off-balance sheet arrangements that have, or are reasonably likely to have, a current or future effect on the Company’s financial condition, results of operations, liquidity, capital expenditures or capital resources.