The New York Declaration of Sponsor is a document or agreement signed by a sponsor or guarantor of a tenant who is renting or leasing a property in New York City. This agreement states that the sponsor or guarantor is liable for the financial obligations of the tenant, including rent payments, if the tenant fails to pay them. The New York Declaration of Sponsor is a requirement of the New York City Housing Authority (NYC HA), which is responsible for administering rent-regulated leases. There are two main types of New York Declaration of Sponsor: a residential declaration and a commercial declaration. A Residential Declaration is required for all leases of rent-regulated apartments or houses, while a Commercial Declaration is required for all leases of commercial property. Both declarations must be signed by the sponsor or guarantor and the tenant, and they must be witnessed and notarized. The New York Declaration of Sponsor helps to protect NYC HA from any financial liabilities should the tenant fail to pay rent.