My dad has agreed to cosign a lease with me but I am afraid my application will just be thrown out since I cannot provide a credit score or any proof of income. Signer is a thirdparty person who signs a lease agreement along with the applicant, but they generally won't live on the property.If a co-signer is required and approved an extra refundable conditional fee equal to one months rent will be required. However, most cosigners will need to meet income and credit requirements. This article gives you a complete guide to Maryland rental applications. We provide information about what a Maryland rental application should include. Your application will not be considered until the cosigner has completed the application as well. Add Cosigners. Pets. It is up to you to find out everything you need to know before entering into the lease agreement. The purpose of a rental application is to help the landlord assess a tenant's suitability for a rental property.