Upon a decision of the board not to reduce the price in accordance with paragraph (b)(1) of section 700.4 of this Part, any party to an appeal before the board may represent himself or herself in matters relating to the appeal. Any such party also has the right to be accompanied, represented and advised by an attorney admitted to practice before the New York State Supreme Court; provided, however, that all hearings shall be informal and an appellant shall not be required to be represented by an attorney.

An attorney-at-law, engaged to represent or appear for any party to a proceeding on appeal, must file with the board a written notice of appearance. The notice shall identify the proceeding, set forth the name of the party on whose behalf the attorney appears, contain a demand that copies of subsequent written communications or notices to such party be sent to the attorney at a designated office and mailing office address, and be dated and endorsed with the name of the attorney.