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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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Usable area calculation

Delara gallery
February 10, 2024


I would like to know for a 7th floor of an office building ( based on boma office 1996), the columns attached to the exterior walls (from interior side) should be included to usable area of the unit or excluded? (As we know the walls should be excluded)

Thank you,

David Fingret
Extreme Measures Inc.
February 12, 2024

Hi Delara,

Columns are ignored, so some portions of the column may be included and some portions may be excluded depending on what is adjacent to the column. On a typical office floor, the glazing of the window system is normally adjacent to the column on both sides of the column, and the column itself is usually projecting within the interior. In such as case, the portion of the column within the interior of the building is included as the measure line is established along the window glazing and continues through the column, since the column is ignored.

The BOMA 1996 standard document illustrates this.

I hope this helps.


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