Co-signers must also pay an application fee and give the same consent as other applicants. â–« If you have no prior rental history, then you must have a qualified co-signer.It is at Management discretion as to whether a co-signer on a rental application will be allowed. 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. Co-signers can be helpful since they can fill vacancies more quickly, which is beneficial, especially when the rental market is competitive. Our Lease Cosigner Agreement form is customizable so that you can include as much or as little additional information as you would like. Every occupant over the age of 18 must fill out an application. All potential tenants need to prove that they can pay the rent. This can be done in different ways, from past references to a co-signer. All potential tenants need to prove that they can pay the rent.