A second chance to secure your dream home. Helping you qualify for the rental you want, while giving property managers protection against defaults.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. Most courts hold that if you sign a oneyear lease, then the guarantor is only responsible for that first year. Com or ask your property manager about Leap. A lease guarantor is an individual who accepts financial responsibility if a tenant defaults on the lease agreement. An apartment guarantor, often referred to as a cosigner, is an individual who signs the rental contract alongside the primary tenant. A guarantor is a person who will cosign an apartment lease alongside a tenant, guaranteeing to pay the rent if the tenant fails to do so. For many renters, securing an apartment lease often requires the support of a guarantor, also known as a cosigner.