N.Y.C. Admin. Code § 11-143: § 11-143 Contact information of real property owners.

The department shall make best efforts to collect the name, telephone number, and email address of every owner of real property in the city, or where such information is not available, the name, telephone number, and email address of an individual authorized to receive communications regarding the real property on behalf of such owner. Such best efforts shall include, at a minimum, soliciting the above-listed contact information on hard copy and online forms, applications, and other documents created by the department for submission by a property owner related to the recording of deed-related or mortgage-related documents, as such terms are defined in section 7-628 of this code, or the administration of real property personal tax exemption programs, the tax lien sale, the real property transfer tax, or the tax on mortgages. Upon receipt of any of the contact information described above, the department shall ensure that any computer system or database used by the department for the purpose of maintaining or compiling information about property owners or otherwise administering the real property tax contains such information.

(L.L. 2020/105, 10/24/2020, eff. 7/1/2021)