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. A cosigner in NYC is someone who will guarantee to pay the lease in your place if you are unable to.Our page offers valuable insights and advice on cosigning for apartments, including tips for protecting your credit and navigating potential pitfalls. Learn the essential steps on how to add a cosigner to a lease to strengthen your rental agreement. A cosigner for a rental property is someone who agrees to pay the rent if you cannot. Fill out the lease guaranty application online and send us your paperwork. Learn the essentials of renting with a cosigner to secure your ideal apartment, covering key benefits and how to choose one. A guarantor is a person or a company who will co-sign on your lease in case you do not qualify to rent an apartment in New York on your own. A guarantor is a person or a company who will co-sign on your lease in case you do not qualify to rent an apartment in New York on your own. 4) Under rent stabilization in NYC, when must the renewal lease be offered?