An empty space connecting two or more floors in a civilian building and enclosed at the top of this space (usually a large space, used for architectural purposes or creating commercial, service, business, exhibition spaces and similar. Openings on floors that are connected only for the purpose of staircases, escalators, elevator shafts, or utility shafts and ducts are not considered atriums). This space may be connected to building parts on each connected floor (corridors, rooms and similar).”.

– Add at the end of the NOTE of Point 1.4.50 as follows: “For buildings of groups F1 to F4, a mezzanine is not counted as a building story when it is used as a utility area and has a floor area not exceeding 10% of the floor area immediately below and not exceeding 300 m2 (only 1 mezzanine not counted as a building story is allowed).