Your letter should have a professional and informative tone, covering exactly why you're denying their rental application. Provide a Reason Letter: Select the reason(s) for the rental application denial or include any additional reasons not covered in standard options.Under federal law, a landlord who denies your tenant application because of information in a tenant screening report is required to inform you of that fact. Yes. It is absolutely legal for a landlord to refuse to rent to you for no reason. If you're unsure on whether or not you have a valid reason to deny a person's rental application, consider consulting with a legal professional. First, clearly state the reason for the appeal of the property's decision and restate their reason for denying your rental application.