N.Y. Comp. Codes R. & Regs. tit. 4 § 213.5
Within five working days after notification from the deputy chair or other agent of the board so designated that the motion for leave will be considered by the board, any other party may file an original and four copies of a response and brief in opposition as a separate document. A copy of the response and brief shall be served simultaneously upon all other parties and proof of such service shall be filed with the board. Should the chairperson authorize electronic filing of such motions and responses thereto, the filing of a signed paper original consistent with this section and electronic filing and service of a copy shall constitute compliance with the filing and service requirements herein contained.
N.Y. Comp. Codes R. & Regs. Tit. 4 § 213.5