The R-4 District is intended and designed to provide for certain high density residential areas of the City, which by reason of their design and location, are suitable for mobile home development and which are compatible with surrounding residential areas.

   1.   Principal Permitted Uses and Structures. Following are the principal uses and structures permitted in the R-4 Mobile Home Park Residential District:

      A.   Mobile home parks, in accordance with regulations of the State of Iowa and minimum requirements contained herein, but not including mobile home sales and display areas. No part of any park shall be used for nonresidential purposes except such uses that are required for the direct servicing and well-being of park residents and for the management and maintenance of the park. This shall in no way prohibit the sale by a resident owner of a mobile home located on a mobile home space and connected to the pertinent utilities.

      B.   Mobile home subdivision parks in accordance with Story City subdivision ordinances and State statutes regarding platting provisions, provided that no lot sold or leased may be used for other than an independent mobile home converted to real estate. Manufactured homes and modular homes are permitted in mobile home subdivisions.

   2.   Accessory Uses.

      A.   Accessory uses may include garages and storage buildings, common facility service buildings which provide laundry facilities, accessory supplies, vending machines, etc.; also park management buildings, maintenance buildings, community buildings, and other uses of a similar nature. Common facility service buildings shall be located within the central “park” area, and shall be restricted to the use of the park occupants.

      B.   One permanent identification sign shall be permitted at any entrance to a mobile home park. Such sign shall be of ornamental metal, stone, masonry or other permanent material and shall include only the name of such mobile home park. Such sign shall not exceed 100 square feet in surface area.

   3.   Lot Area, Lot Frontage and Yard Requirements:

      A.   The minimum area proposed for a mobile home park and mobile home subdivision park shall have at least 10 acres of gross development area. The maximum density allowed for the gross development area shall be seven (7) mobile home units per gross acre.

      B.   Each yard abutting on a public street shall be considered a front yard and shall be a minimum of 50 feet. All other yards, whether side or rear, shall be a minimum of 30 feet when adjacent to any other R district and 50 feet when adjacent to a C or M district.

      C.   The individual mobile home lot shall contain not less than 4,500 square feet in area with a minimum depth of 90 feet. Each lot shall have a front yard of not less than 15 feet in depth measured from the edge of the surfaced street to the closest point of the lower face of the mobile home. Side and rear yards shall be provided and maintained so as to provide a separation at the nearest point between mobile homes, and other buildings and structures on adjoining lots of at least 25 feet but not less than 10 feet to any side and 15 feet to rear yard. Nothing in the Zoning Code shall prevent the construction of entranceways, rooms, breezeways, or other integral parts to the existing mobile home.

      D.   A minimum of 250 square feet for each lot shall be provided for one or more recreation areas which shall be easily accessible to all park residents. The required recreational area shall be computed in addition to the minimum lot area specified herein.

      E.   Storm shelter for residents shall be required within mobile home park.

   4.   Parking. A minimum of two off-street parking spaces for each mobile home shall be provided. All parking areas shall be constructed with a Portland cement concrete or asphaltic concrete surface.

   5.   Streets. The entrance road connecting the park streets with a public street shall have a minimum road pavement width of 31 feet, measured back to back of curbs. All interior streets shall not be less than 28 feet in width, measured back to back of curbs. All streets shall be constructed with either asphaltic concrete or Portland cement concrete with concrete curb and gutter to provide for drainage. Pavement shall be constructed to City subdivision regulations and standard specifications.

   6.   Skirting. Skirting of a permanent type material and construction shall be installed within 90 days to enclose the open space between the bottom of a mobile home floor and the grade level of the mobile home stand. The skirting shall be maintained in an attractive manner consistent with the exterior of the mobile home and to preserve the appearance of the mobile home park.

   7.   Tie-Downs. Tie-downs or anchors shall be provided on every mobile home space. Each tie-down or anchor must be able to sustain a minimum tensile strength as required by the State Building Code.

   8.   Foundation. Foundations shall be provided in accordance with manufacturer’s requirements and the State Building Code.

   9.   Utilities. Sewer and water facilities shall be provided for each mobile home park space or lot in accordance with the requirements of the Story City subdivision regulations and standard specifications. Any lagoons or other treatment facilities constructed in conjunction with the development, shall be located not less than 75 feet from any public road or street or lot line (in the case of a lagoon, this distance shall be measured from the outside toe of the levee slope in accordance with the requirements of the Iowa Department of Natural Resources).

   10.   Plan Required. Each petition for a change to the R-4 zoning classification submitted to the City shall be accompanied by a mobile home park plan. Said plan shall show each mobile home space, the water, electrical, and sewer lines serving each mobile home space, the location of garbage cans, water hydrants, service buildings, driveways, walkways, recreation areas, required yards, parking facilities, lighting and landscaping. If public water and sanitary sewage facilities are not available to the mobile home park site, common water and sewage systems shall be provided in accordance with the requirements of the Iowa Department of Natural Resources, subject to approval of the City Council. The plan shall be considered by the Planning and Zoning Commission, and the City Council, who may approve or disapprove said plan or require such changes thereto, as are deemed necessary to effectuate the intent and purpose of the Zoning Code. All changes to the R-4 classification shall be made in accordance with the provisions of Sections 168.16 and 168.17 of the Zoning Code.

   11.   Existing Mobile Home Parks. Mobile home parks in existence at the time of passage of the zoning ordinance, which are zoned R-4 by this section, shall be considered as having met all of the requirements of this section. Any enlargement, additions, or extensions to such mobile home park shall be in accordance with the provisions of this section.