Insurent's lease guarantor service makes it easy to get approved, even if you don't meet strict financial requirements. Accepted in NYC, NJ, DC, and more.A lease guarantor form is an agreement that makes a guarantor responsible for a tenant's actions. Requiring a lease guarantor helps brings a sense of security and alleviate uncertainty when it comes to collecting rent from your tenants. To apply, you must complete the lease guaranty acknowledgement, guaranty application, and guaranty form. 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 someone who agrees to be on a lease and guarantees to pay a tenant's rent in the event that the tenant defaults on their rental obligation. In most cases, guarantors will fill out the same application as a full lessee. The difference being that some landlords require only a credit screening. NYU may act as a lease guarantor for eligible NYU Grossman School of Medicine house staff seeking off-campus housing.