Each city, other than the city of New York, shall form part of the county social services district of the county in which it is situated and shall not assume any powers and responsibilities for the administration or expense of public assistance and care, in addition to those specified in subdivision two of section sixty-nine, except pursuant to the provisions of sections seventy-four and seventy-four-a of this chapter.
N.Y. Soc. Serv. Law § 57