All appointments made to the special assessment commission shall be subject to the confirmation of the governing body. Upon appointment and confirmation, each commissioner shall file with the city auditor a written acceptance of the appointment and shall take and subscribe the oath required of other municipal officers, which shall be filed with the city auditor. The member of the commission having the shortest term to serve shall act as chairman. No member of the commission shall hold any other municipal office while serving as such member. The appointing authority shall establish the rate of compensation for commissioners and actual expenses incurred by commissioners may be reimbursed at the official reimbursement rates of the appointing authority.