Your letter should have a professional and informative tone, covering exactly why you're denying their rental application. This guide will help landlords navigate the rental application denial process and provide a free rental application denial letter template.First, clearly state the reason for the appeal of the property's decision and restate their reason for denying your rental application. One option is to write a cover letter that explains why you have a lower credit score as well as what you are actively doing to raise it. Rental application denial can happen for many of reasons. Can a landlord legally reject my rental application? One of the biggest issues you can clearly see is when a tenant cannot afford to live in your complex. Each individual that is 18 years of age and older must complete a separate rental application and pay an application fee. These factors might indicate potential financial instability and increase the likelihood of rental application denial. In order to collect this late fee, the landlord must have included notice of it in a written lease.