Each authority created pursuant to section 99.921, except a countywide downtown economic stimulus authority created pursuant to subdivision (3) of section 99.921, shall be governed by a board of commissioners. The number of commissioners serving on the board of each authority shall be no less than five and no more than fourteen, which number shall be established by ordinance of the municipality of which one shall be a member of any local community development corporation, if one exists in the municipality, and one shall be an African American business owner in the municipality, if one exists. One of the initial commissioners appointed pursuant to this subsection shall be appointed by the school district or districts located within the development area for a term of three years. The other initial commissioners appointed pursuant to this subsection shall serve staggered terms of one, two, and three years as determined by the mayor or chief executive officer of the municipality at the time of their appointment. Thereafter, successor commissioners shall be appointed by the mayor or chief executive officer of the municipality or the school district or districts making the initial appointments for a term of three years. All vacancies shall be filled by appointment of the mayor or chief executive officer of the municipality, or the school district or districts, for the unexpired term. In addition to the commissioners appointed in accordance with this subsection, a nonvoting advisor shall be appointed by the other taxing districts located within the development area.