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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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Atrium Area

Derek Georgeoff
H. Bradford Green Architect Inc.
October 28, 2010

We are currently calculating lease areas for a multi-storey office building with a two-storey atrium. On the second floor the atrium is separated from the adjacent public corridor by a rated glass block fire separation, adjacent janitor's room by a framed fire separation and from the adjacent exit stair by a masonry fire separation. The exterior curtain wall system comprises the fourth face of the atrium

Could you please clarify how the area of the atrium should be treated on the second floor level? Would it still be treated as floor common area? Should it even be included in the Rentable Area for the floor?

Also, would it be treated the same way under the 1996 and 2010 Standards?

Thank-you in advance for your prompt assistance.

David Fingret
Extreme Measures Inc.
October 28, 2010

Hi Derek,

The atrium's "Open To Below" space on the second floor would be a Major Vertical Penetration under BOMA 1980 and BOMA 1996. In BOMA 2010, this space would be considered a void. In all cases, the space is NOT rentable area.

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