Every owner of a structure or property shall be responsible for the extermination of insects, rodents, vermin or other pests in all exterior areas of the premises, except that the occupant shall be responsible for such extermination in the exterior areas of the premises of a single-family dwelling. Whenever infestation exists in the shared or public part of premises of other than a single-family dwelling, extermination shall be the responsibility of the owner. (Prior code § 17-1-5)