1.   Permitted Principal Uses.

      A.   Agriculture and agricultural buildings except as provided by paragraph 2(D) of this section and provided that livestock shall not be housed or fed within 200 feet of any lot in an R District.

      B.   Essential services as defined in Section 165.01 and municipal administrative or public service building or properties, except such uses as storage yards, warehouses, garages, or other uses customarily conducted as gainful business, provided any building is located not less than 20 feet from any lot in an R District.

      C.   Railroad rights-of-way and tracks, not including switching, storage, terminal facilities or freight yards.

      D.   Single-family detached dwellings on lots of 20 acres or more.

      E.   Transformer stations and booster or pressure regulating stations, without service yard or storage.

   2.   When Authorized by Board of Adjustment.

      A.   Sanitary landfills, in accordance with County and State regulations except that no sanitary landfill shall be operated within 1,320 feet of any R District.

      B.   Privately operated country clubs, golf courses, swimming clubs, riding stables, and similar recreation uses provided that any accessory building in connection therewith shall be located not less than 200 feet from any lot in an R District.

      C.   Airports and landing fields.

      D.   Lots for confinement and feeding of livestock subject to controls of surface run-off and located at least 1,320 feet from any R or B District.

      E.   Mining, removal and loading of sand or gravel, including equipment, building or structures for screening, crushing, mixing, washing, or storage located not less than 500 feet from any R District.

      F.   Public parks, playgrounds, and recreational areas.

      G.   Cemeteries of 10 acres or more in size.

      H.   Churches, chapels, or parish houses located not less than 20 feet from any side lot line in any R District.

      I.   Any building or structure occupied or used for nursery, elementary, junior high or high schools, public libraries, and similar public cultural uses located not less than 20 feet from any side lot line.

      J.   A single-family detached dwelling located on a lot or parcel which is less than 20 acres as long as the lot of parcel upon which said single-family detached dwelling will be constructed was:

         (1)   Part of an original lot or parcel that totals more than 40 acres; and

         (2)   The original lot or parcel was occupied by, and owned or beneficially controlled, by a lineal descendant of ancestor of the beneficial owner of the original lot or parcel as defined in Section 450.9 of the Code of Iowa.

      K.   Sale of nursery and greenhouse products.

   3.   Permitted Accessory Uses.

      A.   Buildings, structures, and uses accessory to agricultural uses including roadside stands, selling produce grown on the premises, provided such roadside stands are located not less than 20 feet from a street or highway right-of-way line.

      B.   Private garages or parking areas.

      C.   Living quarters of persons employed on the premises.

      D.   Home occupation as defined and regulated by Section 165.23.

      E.   Signs as regulated by Section 165.21.

   4.   Height Regulations. No principal structure shall exceed two and one-half stories or 30 feet in height, and no accessory structure shall exceed 15 feet in height, except as provided in Section 165.24.

   5.   Lot Area, Frontage and Yard Requirements. The following minimum requirements shall be observed subject to the additional requirements, exceptions and modifications in Section 165.24. Each lot shall contain a minimum area of 10 acres.