Item 2. Properties

Our corporate headquarters are located in Denver, Colorado, consisting of one owned office building and one leased office building. We lease space for our international headquarters located in the United Kingdom. Our laboratory is based in Florida where we operate our lab services out of one leased building. We also lease other administrative offices in the U.S. and worldwide.

The vast majority of our U.S. and international outpatient dialysis centers are leased. We believe that if we were unable to renew a lease of a dialysis center or administrative office, we could find alternative space at competitive market rates and relocate our operations to such new location without material disruption to our business. See Note 13 to the consolidated financial statements included in this report for information regarding our leases, and "Location of our U.S. dialysis centers" and "International dialysis operations" under Part I Item 1. "Business" for the locations of our U.S. dialysis centers and international dialysis centers, respectively.