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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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MUCA in Method A and Method B

Dimensions L.A.B.
September 20, 2018

I am experiencing a real disconnect here while trying to interpret the Mixed-Use Standard and this may be a very basic (as in dumb) question...
I am being asked to calculate the leasable sf for one level of retail only. Do I need to calculate MUCA for all the uses in a project (1 level retail, 2 levels of office, 3 levels of parking, 30 levels of residential) in order to use Method A and to use Method B?
What if retail is on the first floor, has its own toilet rooms, and only uses first floor amenities (enclosed trash area and fire riser room) and top floor mechanical room? Do I still need to include the egress stairs and elevators if they don't serve the first floor retail?
Feeling a little dumb over here!
Thank you in advance--

David Fingret
Extreme Measures Inc.
September 21, 2018

Hi Jenna,

If you are being asked to determine the GLA of a retail floor, there is usually no reason to use the Mixed-Use Standard at all. There is no allocation of Mixed-Use Common Area (MUCA) to a retail use component, so try to avoid going through this complicated process. The Mixed-Use Standard is most useful when there is an office use component since MUCA is allocated to the office use component proportionately (as rentable area), based on the Exterior Gross Area of all the use components.

There may be a difference in the GLA of the retail floor using the Retail Standard vs the Mixed-Use Standard since use components in the Mixed-Use Standard are separated by the centerline of walls. The Retail Standard uses the centerline of walls that separate adjacent retail units only and is otherwise measured to the exterior face of common area walls and exterior walls; therefore, depending on the configuration of your building, there may be a difference between the GLA in the standalone Retail Standard and the GLA under the Mixed-Use Standard. If there is a difference and your project requires the area to be determined according to the Mixed-Use Standard, you should still be able to provide the appropriate GLA without going through the entire calculation process, by simply following the wall hierarchy rules in the Mixed-Use Standard.

I'm not sure what you mean by Method A and Method B as this pertains only to the Office Use Component and Multi-Unit Residential use component and should have no impact on your Retail calculations.

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