§ 160.05 “A-2” ESTATE RESIDENTIAL DISTRICT.
   (A)   Purpose. The purpose of this district is to protect and control small scale agricultural operations and control urban sprawl consisting of scattered low density residential development; prevent such operations and development from being divided into still smaller parcels; and facilitate future redevelopment of such parcels through setbacks minimum parcel dimensions, and other measures. Urban sprawl may necessitate the premature, and long-term inefficient extension of urban services, and hinders or prevents the establishment of sustainable, viable suburban development once the full array of municipal services becomes available.
   (B)   Permitted principal uses.
      (1)   Agricultural uses, including but not limited to row cropping and the raising and feeding of poultry, swine, livestock and sheep, dairying and truck farming, but excluding poultry, livestock and swine confinements to the extent permitted by the Code of Iowa;
      (2)   Single-family detached dwelling unit; and
      (3)   Golf course or country club, subject to § 160.51.
   (C)   Accessory uses. The following uses, if clearly subordinate and customarily incidental to the principal use, shall be permitted:
      (1)   Agricultural buildings and structures, and the keeping of livestock where the principal use is agricultural;
      (2)   Garage, carport and boat house;
      (3)   Greenhouse;
      (4)   Servants’ quarters;
      (5)   Roadside stand for the sale of agricultural products produced on the same zoning lot, where the principal use is agriculture;
      (6)   Private (non-commercial) stable, subject to § 160.39; and
      (7)   Club house, cart storage shed and other buildings or structures on the grounds of a golf course.
   (D)   Conditional uses. The following conditional uses may be allowed by the Board of Adjustment subject to § 160.63, provided such use complies with the requirements of this and all other city codes and is in accordance with the Comprehensive Plan of the city:
      (1)   Public or private elementary, junior high or middle schools, high schools and similar educational facilities, but not including boarding, rooming or residential dwelling units;
      (2)   Accessory dwelling unit, subject to § 160.37;
      (3)   Churches and other religious organizations, but not offices as a principal use;
      (4)   Nursery schools and other child care;
      (5)   Small wind energy conversion system (SWECS), subject to § 160.48;
      (6)   Public utility facilities, including transmission and distribution equipment, substations, regulator stations and buildings associated therewith, but not including facilities for maintenance or general operations or communication towers. Evidence shall be provided to show such facilities are essential to service the public; that no reasonable alternative exists; and that all negative impacts, including esthetics, have been mitigated to the extent possible;
      (7)   Communication towers with a height of 100 feet or less, on a nonresidential property such as a school or church, subject to a minimum setback of 200 feet from the boundary of any property used or expected to be used for residential purposes, and from any “A-1” or “A-2” property designated for residential use by the Comprehensive Plan; and subject to § 160.47;
      (8)   Cemeteries;
      (9)   Public or nonprofit museums and historic sites or buildings, including offices and support facilities accessory thereto;
      (10)   Kennels and stables;
      (11)   Bed and breakfast, subject to § 160.57; and
      (12)   Other uses determined by the Board of Adjustment to be similar in character.
   (E)   Bulk requirements. The following minimum requirements shall be observed:
      (1)   Minimum lot area: ten acres;
      (2)   Minimum lot width: 300 feet;
      (3)   Minimum front yard setback: 50 feet as measured from the right-of-way line or 80 feet as measured from the centerline of the street, whichever is greater;
      (4)   Minimum side yard setbacks: one side yard setback shall be a minimum of 30 feet, or 50 feet on the street side of a corner lot; and the other side yard setback shall be a minimum of 205 feet;
      (5)   Minimum rear yard setback: 35 feet; and
      (6)   Maximum building height: 35 feet, provided that no building shall exceed a bulk plane having a 14-degree altitude calculated from a horizontal plane extending through a line located 18 feet above the average elevation of the north lot line, if an existing building with a passive solar design that includes thermal storage, or an existing solar photovoltaic array that is capable of producing a minimum of 3-kW DC in direct sun, lies to the north; said existing design or device shall be previously documented for this limitation to be applicable.