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This help desk is a free resource intended for discussion purposes only. Neither BOMA, its chapters, affiliates, or Extreme Measures Inc.® are responsible for the information, comments or opinions expressed herein. For complete information, refer to the official publications of the standards themselves.

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Ground Floor Major Vertical Penetrations

Guest User
Guest Company
January 27, 2010

In the BOMA definition of floor rentable area for a typical ground level floor, it states that the “floor rentable area shall mean the result of subtracting from the gross measured area of a floor, the area of the major vertical penetrations on that same floor.” The definition of typical ground level does not indicate if there’s a basement.

I am looking at a two story office building that is slab on grade (no basement). Access to the second floor is provided by an elevator and two stairwells. Under your BOMA definition of floor rentable area, should I deduct the area of the elevator and stairwells on the first floor (ground level) and second floor? Or should the second floor areas just be deducted since it is the only floor that is vertically penetrated?

Adam Fingret
Extreme Measures Inc.
January 27, 2010

Deduct the penetration on all levels where stairs and elevators occur - even at the lowest level (in this case ground level).

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