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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 - Convert from EGA to IGA on Office floors

Dustin Thorlakson
Freiheit & Ho Architects
March 21, 2013

I have been asked to run BOMA calculations for a large mixed use project that includes Parking, Office, Retail, and Hotel.

I have made it through the MUCA allocations and am proceeding to determine the Office portion. My question is:

I have multiple elevators and egress stairs on each office floor classified as MUCA-C (since there are retail areas on the top level of the building). When calculating the EGA for the MUCA allocation the measure line is located at the centerline of walls. However, when calculating IGA for an office use, the measure line is supposed to be at the far side of Major Vertical Penetrations. Therefore, when I run the calcs for the office floors half of the walls making up these egress stairs and elevator hoistways seems to be unaccounted for. BOMA Z65.6-2012 states that I only need to change the measure line of walls at the exterior of the building. This doesn't make sense to me. Am I doing this correctly or is there something I am missing?

Thank you!

David Fingret
Extreme Measures Inc.
March 21, 2013

Hi Dustin,

I am researching your question. In the meantime, please look on page 34 of the mixed use standard. There is a definition for the Office IGA/EGA Ratio. Does this lead you in the right direction?

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