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Shared circulation aisle

Cynthia Émond
mdtp Atelier d'architecture
October 3, 2025

Hello,

We would like your opinion on the BOMA measurement standard for office buildings (ANSI/BOMA Z65.1-1996). In our case, we use the method for office buildings, even though we have a multi-use building: the ground floor is commercial office space, the upper floors are residential, and the basement is shared.

In the basement, the circulation aisle provides access to the parking spaces, but also to various rental spaces (lockers) and most of the building's mechanical rooms, since the basement does not have a common corridor. If the circulation aisle also provides access to other common areas of the building around the parking spaces, can the aisle be considered, in part or in full, a "common area of ​​the building" and be included in the building's gross leasable area, distributed equally among the tenants? Parking spaces are obviously excluded from the floor area.

BOMA Office 2010 appears to clarify certain elements of parking lots and access aisles, but this change, in our opinion, was not present in 1996 and does not appear to apply to the multi-use building. However, in our situation, objective clarification of the 1996 method would be necessary to resolve certain discussions with potential tenants, as the 1996 method does not contain any definitions, details, or illustrations related to the circulation aisle.

Thank you for your assistance.

David Fingret
Extreme Measures Inc.
October 7, 2025

Hi Cynthia,

We would not typically include circulation aisles within a structured parking area. However, we do include constructed and enclosed circulation spaces such as corridors and elevator lobbies. Demarcated circulation paths or lightly constructed routes within the parking structure are generally excluded by us.

As you pointed out, the BOMA 1996 standard offers limited guidance on what should or shouldn't be included in these cases. To address such ambiguities, we usually refer to subsequent BOMA standards, which provide more detailed clarifications.


Thanks,
David

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