We outline how to write a nonrenewal lease letter with a free PDF template. Save on application fees with Avail.A lease non-renewal letter should be sent out 30-60 days before the lease agreement is set to expire. Below are two sample letters to use when ending a lease agreement. Please note these are samples and not templates and cannot replace legal advice. This blog is the perfect place to learn about contract termination letters. We will guide you through how to write a termination of contract letter. For a sample release and settlement agreement, see Standard Document,. Settlement Agreement and Release. (2-503-1929). - Here is a sample letter for non-renewals that are illegal because of discrimination.