Your letter should have a professional and informative tone, covering exactly why you're denying their rental application. Comprehensive guide on how to send a rental application denial letter.Download our free rental application denial letter to use for your rental business. Find your next tenant with Avail tenant screening. This guide will help landlords navigate the rental application denial process and provide a free rental application denial letter template. 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. You should always act fairly, professionally, and compliantly when rejecting rental applications. Check out our guide below for the best practices. First, clearly state the reason for the appeal of the property's decision and restate their reason for denying your rental application. 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.