A geographic area may be nominated and designated as a historic district if the district satisfies all of the following requirements:
   A.   The district is comprised of contributing properties that are contiguous or grouped in close proximity, and that are located in a definable area and are unified by theme, plan, or physical development;
   B.   The district reflects significant development patterns, including those associated with different eras of urban growth, particular transportation modes, or distinctive examples of community planning;
   C.   No part of the district, and no property in the district, is located in an area of the city zoned for one-family development, including, but not limited to, any area zoned R-1;
   D.   At least seventy percent (70%) of the properties in the district are contributing properties;
   E.   All of the contributing properties predominantly embody the distinctive elements of a single architectural style or architectural type or architectural period;
   F.   Each contributing property retains substantial integrity from the district's period of significance; and
   G.   The district as a whole has continued historic value to the community such that its designation as a district is reasonable and necessary to promote and further the goals of this article. (Ord. 15-O-2682, eff. 11-19-2015)