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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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When to categorize space as building common or floor common

Judy Laube
The Laube Group
December 13, 2023

It appears to me building common is a designation originated for identifying space in a multi-tenant building which is available to all tenants. If the building is 100% owned by one tenant, would one categorize just the elevator lobbies in upper floors as building common or if conference rooms in upper floors are available to all, would they then be categorized as building common or floor common?

David Fingret
Extreme Measures Inc.
December 13, 2023

Hi Judy,

If you are applying the BOMA 2017 Office Standard to a single tenant building, there is no difference to how the Space Classification are allocated compared to a multi-tenanted building. The tenant will simply receive 100% of the common area allocations / Load Factor.


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