Download a customizable rental application rejection letter template for landlords or property managers to professionally notify applicants. Good evening, BP. I'm writing my Tenant Rejection Letter and found some reasons online as to why a tenant is denied their application.Clear statement of your decision: Communicate that the tenant's application was unsuccessful right at the beginning of the letter. 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. Below we outline some of the common reasons why a rental application may be denied, and how you can fix them. The best time to send an appeal letter is within a week from receiving the denial letter. The form you need to respond to an eviction case is Answer - Unlawful Detainer-Eviction (form UD-105). 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. A nonrejection letter.