Learn the essential steps on how to add a cosigner to a lease to strengthen your rental agreement. 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.As a co-signer, you don't have to live in the apartment but your name will be on the lease and you'll be legally obligated to follow the terms of the lease. Many NYC landlords require renters without good credit and salary to have a guarantor or cosigner. A cosigner can be anyone over the age of 18 with adequate income and credit history to qualify for a rental property lease. A cosigner for an apartment takes on the financial responsibility for a lease. Learn how having a cosigner can help someone get approved for an apartment. This guide will provide all the necessary information you need to screen, process, and add a cosigner to a lease. Any landlord renting a housing accommodation to a tenant within the County of Suffolk shall offer to such tenant, in writing, a minimum lease term of one year. A cosigner must agree to share personal financial information with the landlord, just as potential tenants do.