We discuss everything you need to know about turning down applicants and provide a template for your convenience. 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. You should always act fairly, professionally, and compliantly when rejecting rental applications. Check out our guide below for the best practices. Your letter should have a professional and informative tone, covering exactly why you're denying their rental application. Download a customizable rental application rejection letter template for landlords or property managers to professionally notify applicants. 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.