You should always act fairly, professionally, and compliantly when rejecting rental applications. Check out our guide below for the best practices."I thank you for taking the time to work with me, but I've decided to decline your offer. " Short, simple and direct. Comprehensive guide on how to send a rental application denial letter. A rental application denial letter, also known as an adverse action letter, is a formal document that a landlord or property manager sends to applicants. We discuss everything you need to know about turning down applicants and provide a template for your convenience. In this article, we'll talk you through what's included in a rental application denial letter and even give you a free template to use. In this post, we go through how to deny an applicant based on suspect information on their tenant screening report.