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"Historic structure" means any structure that is: '`r (a) Listed individually in the National Register of Historic Places (a listing maintained by the Department of Interior) or preliminarily determined by the Secretary of the Interior as meeting the requirements for individual listing on the National Register; (b) Certified or preliminarily determined by the Secretary of the Interior as contributing to the historical significance of a registered historic district or a district preliminarily determined by the Secretary to qualify as a registered historic district; (c) Individually listed on a state inventory of historic places in states with historic preservation programs which have been approved by the Secretary of Interior; or (d) Individually listed on the City's list of historic places, adopted pursuant to Chapter 30 of this Code. "Levee" means aman-made structure, usually an earthen embankment, designed and constructed in accordance with sound engineering practices to contain, control or divert the flow of water so as to provide protection from temporary flooding. "Levee system" means a flood protection system which consists of a levee, or levees, ~, and associated structures, such as closure and drainage devices, which are constructed and operated in accord with sound engineering practices. "Lowest floor" means the lowest floor of the lowest enclosed area, including basement (see definition of "Basement"). (a) An unfinished or flood resistant enclosure below the lowest floor that is usable solely for parking of vehicles, building access or storage in an area other than a basement area, is not considered a building's lowest floor provided it conforms to applicable non-elevation design requirements, including, but not limited to: (1) The flood openings standard in section 7-17, (2) The anchoring standards in section 7-17(a), (3) The construction materials and methods standards in section 7-17(b), and (4) The standards for utilities in section 7-18. 's. (b) For residential structures regulated by this chapter, all subgrade enclosed areas are prohibited as they are considered to be basements (see definition of "Basement"). This prohibition includes below-grade garages and storage areas. Ordinance No. NS-2789 Page 7 of 27