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"Story" is that portion of a building included between the upper surface of any floor and the upper surface of the floor next above, except that the topmost story shall be that portion of a building included between the upper surface of the topmost floor and the ceiling or roof above. If the finished floor level directly above a usable or unused under-floor space is more than six feet (1829 mm) above grade, as defined herein, for more than 50 percent of the total perimeter or is more than 12 feet (3658 mm) above grade, as defined herein, at any point, such usable or unused under-floor space shall be considered as a story. In Group R Division 1 occupancies consisting of five or more units containing two or three floor levels, each floor level is a story for the purposes of the following requirements:

(1) Type of construction;

(2) Fire sprinkler systems;

(3) Fire alarm systems; and

(4) Number of exits. (Added by Amended Ord. 02-064, Dec. 9, 2002, Eff date Feb. 1, 2003).