After careful consideration of your rental application, I regret to inform you that we have decided not to proceed with your application at this time. Clear statement of your decision: Communicate that the tenant's application was unsuccessful right at the beginning of the letter.Comprehensive guide on how to send a rental application denial letter. In your letter, you should politely decline the applicant. If the application isn't fully completed, you don't need to give any further reason to reject. Your letter should have a professional and informative tone, covering exactly why you're denying their rental application. 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. Even if there is a specific reason to reject an application, do not reveal it. It may cause more trouble than what it's worth. A tenant cannot be rejected simply because of their race, creed or colour.