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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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Single tenant floor V.S. shared tenant floor

December 19, 2018


I need to calculate the rentable area for a single tenant floor plan and a shared tenant floor plan.

If I use the alternate method proposed on top of page 27 with a R/U ratio, when I calculate the rentablea area for the single tenant floor, do I include in my office area the common corridor, floor toilets and mechanical rooms as the tenant will be the only one using them?

And do I exclude these spaces for the shared tenant floor plan?

Thank you,

David Fingret
Extreme Measures Inc.
December 20, 2018

First of all, the alternate method on page 27 does not change the result.

On a single tenant floor, any area under the tenant's control is part of the usable area. In this case, if the corridor is space that the tenant controls and can occupy, it is part of the usable area of the tenant. Usually, this is the case, but in some high rise buildings, a single tenant floor might have a crossover corridor as a requirement for fire code. In that situation (or similar situation), the corridor is Building Common Area. Washrooms and mechanical rooms should be Floor Common Area (or Building Commmon Area, if they serve the building).

On a multi-tenant floor, the corridor is Floor Common Area (or Building Common Area if it serves the building). Washrooms and Mechanical rooms are allocated the same as mentioned above.

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