The expiration date of the moratorium permit, if prior to the date of filing with the county clerk of final boundary lines for the tidal wetland which is the subject of such moratorium permit, may be extended by the central tidal wetland permit administrator for good cause shown upon a written request to him filed not later than 45 days prior to the expiration date and upon simultaneous notice to the parties in interest by the holder of the moratorium permit. Such request shall set forth the grounds for such extension. The holder of the moratorium permit shall be required to serve the parties in interest at his own expense with a copy of the documents evidencing the action of the central tidal wetland permit administrator with respect to such requested extension.