“Zoning district” means the land use designation for an area as established in the zoning ordinance, PMC Title 17. Commercial zoning districts include airport commercial, limited commercial and general commercial districts and any similar districts. Industrial zoning districts include airport industrial and industrial districts and any similar districts. Residential zoning districts include single-family residential, single-family residential estate, medium-density residential and agricultural districts and any similar districts. (Ord. 466 § 3, 1994)