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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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Base Building Circulation on floors without occupants

Christopher Ashton
Maidment Land Surveys
December 3, 2014

We are calculating areas using Method B on a building with a distributed core. The BOMA standard makes reference to a multi-occupant floor when determining the base building circulation (BBC). We have a couple of questions regarding BBC on floors that will never have tenants:
1) Does BBC exist in an undergroud parkade?
2) Does BBC exist for a mechanical penthouse floor? Access to portions of the penthouse are via external circulation. If BBC doesn't exist for this floor, would this external circulation then be consider a building service area?
Thank you for your assistance.

David Fingret
Extreme Measures Inc.
December 4, 2014

Hi Christopher,

BBC does not exists on floors without occupants. Common Areas in the underground parkade and mechanical penthouse floor would be Service and Amenity Area under Method B.

Please note that BBC is also applied on single occupant floors.


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