<P> In English, the principal floor or main floor of a house is the floor that contains the chief apartments; it is usually the ground floor, or the floor above . In Italy the main floor of a home is usually above the ground level, and may be called the piano nobile ("noble floor"). </P> <P> The attic or loft is a storey just below the building's roof; its ceiling is often pitched and / or at a different height than that of other floors . A penthouse is a luxury apartment on the topmost storey of a building . A basement is a storey below the main or ground floor; the first (or only) basement of a home is also called the lower ground floor . </P> <P> Split - level homes have floors that offset from each other by less than the height of a full storey . A mezzanine, in particular, is typically a floor halfway between the ground floor and the next higher floor . Homes with a split - level entry have the entire main floor raised half a storey height above the street entrance level, and a basement that is half a storey below this level . In Macy's Herald Square, there is a "one - and - a-half" floor between the first and second; this can be considered a split level floor . </P> <P> There are also multi-storey car parks, also known as parking garages . </P>

What does one and a half storey mean
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