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.The landlord at their sole determination, assuming they have solid reasoning can deny your application and does not have to accept any appeal from you. Download a customizable rental application rejection letter template for landlords or property managers to professionally notify applicants. Download our free rental application denial letter to use for your rental business. Find your next tenant with Avail tenant screening. Short-Term Rental applications for permits are currently accepted for dwellings located in the Mountain and Desert areas of San Bernardino County. 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. 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.