Where another attorney was previously retained in connection with such proceeding, the substituted attorney shall file the notice of substitution and appearance, prescribed by the State Liquor Authority, prior to or at the time of his first appearance in the proceeding. The substituted attorney shall also certify that a copy of said notice of substitution and appearance has been served on the superseded attorney, or, if not, will be served by regular mail or otherwise within 24 hours.
N.Y. Comp. Codes R. & Regs. Tit. 9 § 80.3