5. Leases

As the lessee, we currently lease real estate space under noncancelable operating lease agreements for our turn-key data centers at NY1, LA1, LA4, DC1, DC2, DE1, and DE2, and our corporate headquarters located in Denver, Colorado. Our leases have remaining lease terms ranging from 1 year to 11 years, some of the leases include options to extend the leases for up to an additional 20 years. We do not include any of our renewal options in our lease terms for calculating our lease liability as the renewal options allow us to maintain operational flexibility and we are not reasonably certain we will exercise these renewal options at this time. The weighted-average remaining non-cancelable lease term for our operating leases was nine years and ten years at March 31, 2019, and December 31, 2018, respectively. The weighted-average discount rate was 4.9% at each date.

The components of lease expense were as follows (in thousands):


	Three Months Ended March 31,
	2019		2018
Lease expense:
Operating lease expense	$	6,396	$	5,227
Variable lease expense		1,292		1,173
Rent expense	$	7,688	$	6,400