In the letter, express your appreciation for the applicant's interest and politely explain why you declined them. You can ask, but they don't have to answer.They also don't have to be truthful, as admitting to discrimination of any kind is admission of an illegal action. You should always act fairly, professionally, and compliantly when rejecting rental applications. Check out our guide below for the best practices. Download a customizable rental application rejection letter template for landlords or property managers to professionally notify applicants.