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What is: the floor area within the interior perimeter of the exterior walls, exclusive of vent shafts and courts. Inclusive of corridors, stairways, closets, the thickness of interior walls, columns or other features.

What is: The actual occupied area - usable or rentable area - exclusive of unoccupied, non-rentable common areas such as corridors, stairways, mechanical rooms, public toilet rooms and closets.

What is: Out to out square footage. The building footprint.

What is: an opening connecting two or more stories other than enclosed stairways, elevators, hoistways, or other equipment which is closed at the top and not defined as a mall.

Where a building is equipped throught with an approved automatic sprinkler system, the value for maximum building height is increased by 20 feet.