Your letter should have a professional and informative tone, covering exactly why you're denying their rental application. Below we outline some of the common reasons why a rental application may be denied, and how you can fix them.Download a customizable rental application rejection letter template for landlords or property managers to professionally notify applicants. You will either need to clean up your credit, post an additional security deposit or obtain a co-signer. 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. Declining to rent to someone for "no reason" is almost always legal. Our state requires us to send an "adverse action notice" with a valid reason for the rejection. "Sorry, but we will only consider complete applications which must include all occupants and payment of the non-refundable application fee.". Also fill out and file an Application to Prevent Forfeiture Due to COVID-19 Rental Debt (form UD-125). Client did not complete interview (e.g.