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Floors of a Commercial Building

There are some important differences between British English (BrE) and American English (AmE) in talking about the floors in a commercial building.

In BrE the floor at the level of the surrounding land or ground is called the ground floor (this is the floor where you usually enter a building). In AmE the same floor is called the first floor. The floors above are numbered starting from the ground or first floor, so there is usually a difference of one level in BrE and AmE usage:

Many commercial buildings also have a "mezzanine" floor, which is a kind of "half-floor". This diagram shows a six-storey building that has a mezzanine and two basement levels below.

Floors Of A Commercial Building
A floor is the same as a storey: all the rooms that are at the same level