"Sorry, but we will only consider complete applications which must include all occupants and payment of the non-refundable application fee.". In your letter, you should politely decline the applicant.We discuss everything you need to know about turning down applicants and provide a template for your convenience. Download a customizable rental application rejection letter template for landlords or property managers to professionally notify applicants. Your letter should have a professional and informative tone, covering exactly why you're denying their 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. Here's a breakdown of when a landlord can rightfully reject an applicant, as well as some red flags that might indicate bad faith on a landlord's part.