Glossary Term Defined

Absence of a floor within the exterior enclosure of a building in excess of ten square feet (1 square meter) where a floor might otherwise be expected or measured, that is typically in the plane of the upper floors adjacent to multi-story atria or lobbies, light wells, auditoria or the area adjacent to a partial floor, permanent mezzanine or unclassified mezzanine at a given floor level. 

Absence of a floor where a floor might otherwise be expected or measured, that is typically in the plane of the upper floor levels of multi-story atria or lobbies, light wells, auditoria or the area adjacent to a mezzanine.