A. For purposes of this chapter, a historic structure, historic site or historic district designation may be placed on any site, natural or improved, including any building, improvement or structure located thereon, or any area of particular historic, architectural, archeological or cultural significance to the city such as historic structures, sites or districts which:
1. Exemplify or reflect the broad cultural, political, economic or social history of the nation, state or community; or
2. Are identified with historic personages or with important events in national, state or local history; or
3. Embody the distinguishing characteristics of an architectural type or specimen inherently valuable for study of a period, style, method of construction or of indigenous materials or craftsmanship; or
4. Are representative of the notable work of a master builder, designer or architect who influenced his age; or
5. Have yielded, or may be likely to yield, information important to prehistory or history.
B. The commission may adopt specific operating guidelines for historic structure, historic site and historic district designation providing such are in conformance with the provisions of this chapter. (1975 Code Ch. 21 § XXXII)