The city planning commission shall consist of nine (9) members to be appointed by the mayor, if the mayor be an elective officer, otherwise by such officer as the council may designate as the appointing power in the ordinance creating the commission. In a municipality which is divided into wards or other subdivisions for the election of members of the council, one member shall be appointed to the planning commission from each of the wards or subdivisions. All members of the commission shall serve as such without compensation, and the members shall hold no other municipal office, except that one member may be a member of the zoning board of adjustment or appeals and no more than four members may serve on design committees or commissions. The term of each member shall be six (6) years or until his or her successor is appointed and qualified; except that when the commission is first appointed, the respective terms of three of the members shall be three (3), four (4) and five (5) years. Members may be removed by the mayor, after a public hearing, for inefficiency, neglect of duty, or malfeasance in office. The mayor shall file a written statement of reasons for the removal. Vacancies occurring otherwise than through the expiration of term shall be filled for the unexpired term by the mayor or by the appointing power designated by the council in municipalities in which the mayor is not an elective officer.