Organization. The Architectural Review Board shall consist of five members. Such members shall be specially qualified, by reason of training or experience in art, architecture, landscape architecture, community planning, land development, real estate or other relevant business or profession, to judge the effects of a proposed building or structure or alteration thereof upon the desirability, property values and development of surrounding areas. At least one member of such Board should be a registered architect. The members of such Board shall be appointed by the City Council for specific terms and the Chairman thereof shall be designated by the Mayor. Their successors shall be appointed for a term of four years from and after the expiration of the terms of their predecessors in office. If a vacancy shall occur otherwise than by expiration of term, it shall be filled by the Mayor for the unexpired term. The City Council shall have power to remove any member of the Architectural Review Board for cause and after public hearing. The Mayor shall designate a Secretary of the Board, who need not be a member of the Board and who shall serve at the pleasure of the Mayor.