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. Marketing Agent must complete a series of pre-marketing tasks in the New.Guarantors help tenants qualify for an apartment. They promise to cover rent and other expenses if the tenant fails to do so. A guarantor agreement is an agreement of a third party to provide assurance of payment in the event the party involved in the transaction defaults. Edit, sign, and share guarantor lease filling form online. No need to install software, just go to DocHub, and sign up instantly and for free. Guarantor also guarantees the full, prompt and unconditional performance of all obligations and agreements of every kind owed or hereafter to be owed by.