Measure the floor to the outside surface of the building. Subtract from this area the following, including the finished enclosed walls: -Public elevator shafts and elevator machines and their enclosing walls. -Heating, ventilating, and air-conditioning facilities (including pipes, ducts and shafts) and their enclosing walls, unless such equipment, mechanical room space, or shafts serve the floor in question. -Fire towers and fire tower courts and their enclosing walls. -Main telephone equipment rooms and main electric switchgear rooms, except that telephone equipment, and electric switchgear rooms serving the floor exclusively shall not be subtracted.
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