2007 ORS § 479.018¹
Definition for ORS 479.020 and 479.060

As used in ORS 479.020 (Buildings requiring fire escapes) and 479.060 (Location of fire escapes), "story" means:

(1) That portion of a building included between the upper surface of any floor and the upper surface of the floor next above;

(2) For the topmost story, that portion of a building included between the upper surface of the topmost floor and the ceiling or roof above; and

(3) A basement, cellar or unused under-floor space, if the finished floor level directly above the basement, cellar or unused under-floor space is more than:

(a) Six feet above the ground surrounding the building for more than 50 percent of the total perimeter; or

(b) Twelve feet above the ground surrounding the building at any point. [2005 c.22 §363]