The Board of Supervisors, by resolution after public hearings thereon, may designate areas in or on any public street or public place where any street artist or craftsperson certified pursuant to the provisions of this ordinance may sell, offer for sale, expose for sale, or solicit offers to purchase any art or craft item of his or her own creation, provided, however, that any designation of an area in a public place under the jurisdiction of an officer, board or commission of the City and County shall be subject to the approval of such officer, board or commission. In designating such areas, the Board of Supervisors may impose such conditions and limitations as, in its discretion, are necessary to prevent any undue interference with normal pedestrian or vehicular traffic, or any damage to surrounding property, including interference with use, view or enjoyment of public parks.