This Amendment and the Lease together contain the entire understanding of the parties hereto and supersedes all prior agreements and understandings, if any, relating to the subject matter hereof or thereof. Any guarantees, promises, representations or warranties not herein or therein contained and hereinafter made shall have no force and effect unless in writing, and executed by the party or parties making such guarantees, promises, representations or warranties. Neither this Amendment nor the Lease nor any portion or provisions hereof or thereof may be amended, cancelled, changed, discharged, modified, supplemented, terminated or waived orally or by any course of dealing or in any manner other than by an agreement in writing, signed by the party to be charged.