The design commission shall consist of five members to be appointed by majority vote of the city council. One member should be an owner or manager of a business within the city; said business member need not reside in the city. Aside from the business member, if any, all members shall be city residents. At least one member should be licensed in the state of California as an architect, or retired from that status. At least one member should be professionally qualified in horticulture or landscape construction, with preference toward a member licensed in the state of California as a landscape architect, or retired from that status. At least one member should be qualified in a related field, including but not limited to urban planning, urban design, graphic design, historic preservation, industrial design, interior design, building construction, or real estate development.