If the application isn't fully completed, you don't need to give any further reason to reject. 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.You can tell the police that you would like to file charges against your landlord. You may also want to get a restraining order against your landlord. Outside of New York City, the tenant must give one month's notice to terminate the tenancy. You should always act fairly, professionally, and compliantly when rejecting rental applications. Check out our guide below for the best practices. This is called a general denial. This booklet explains many of these laws you need to know and provides resources where you can find more information about landlord and tenant issues.