1. 1.
   Use of Existing Lots of Record. In any district where dwellings are permitted, a single-family dwelling may be located on any lot or plot of official record as of the effective date of this chapter irrespective of its area or width; provided, however:

   1. A.
      The sum of the side yard widths of any such lot or plot shall not be less than thirty percent (30%) of the width of the lot, but in no case less than ten percent (10%) of the width of the lot for any one (1) side yard.
   2. B.
      The depth of the rear yard of any such lot need not exceed twenty percent (20%) of the depth of the lot, but in no case less than twenty (20) feet.
2. 2.
   Structures Permitted Above the Height Limit. The building height limitations of this title shall be modified as follows:

   1. A.
      Chimneys, cooling towers, utility poles, elevator bulk-heads, fire towers, monuments, stage towers or scenery lofts, water tanks, churches, ornamental towers and spires, transmission and receiving towers or necessary mechanical appurtenances may be erected to a height in accordance with existing or hereafter adopted ordinances of the City.
3. 3.
   Water and Sewerage Requirements. In any district, except A-1 District, in which residences are permitted and where neither public water supply nor public sanitary sewer is available, the minimum lot area and frontage requirements shall be as follows:

   1. A.
      Lot area – twenty thousand (20,000) square feet; lot width at building line – one hundred (100) feet; provided, however, that where a public water supply system is available these requirements shall be fifteen thousand (15,000) square feet, and one hundred (100) feet, respectively.
   2. B.
      The above requirements shall not apply in subdivision developments providing private water supply and sewage collections and disposal systems which have been approved by the Iowa Department of Natural Resources.
   3. C.
      In all districts where a proposed building, structure or use will involve the use of sewage facilities, and public sewer and/or water is not available, the sewage disposal system and domestic water supply shall comply with all of the requirements and standards of the Polk County Board of Health.
4. 4.
   Double Frontage Lots. Buildings on through lots extending through from street to street shall provide the required front yard on both sides.
5. 5.
   Other Exceptions to Yard Requirements. Every part of a required yard shall be open to the sky, unobstructed with any building or structure, except for a permitted accessory building in a rear yard, and for the ordinary projections of sills, belt courses, cornices, ornamental features and roof overhang, projecting not to exceed twenty-four (24) inches, and except for yard recreational and laundry drying equipment, arbors and trellises, flag poles, yard lights and similar decorative items.
6. 6.
   Mixed-Use Yard Requirements. In instances where buildings are erected containing two (2) or more uses housed vertically, the required side yards for the first-floor use shall control.
7. 7.
   Visibility at Intersections in Residential Districts. On a corner lot in any residential district, nothing shall be erected, placed, planted, or allowed to grow in such a manner as materially to impede vision between a height of two and one-half (2 ½) feet and ten (10) feet above the centerline grades of the intersecting streets in the area bounded by the right-of-way lines of such corner lots and a line joining points on said right-of-way lines forty (40) feet from their point of intersection.

Effective on: 1/1/1901