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    Gang Chen

    Why not?

    Gang Chen, Author, AIA, LEED AP BD+C (GreenExamEducation.com)

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    Yvette Louka

    I thought we don’t include storage and restrooms in the net square footage. Only in gross ?

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    Gang Chen

    Building efficiency is most commonly expressed as a percentage calculated by dividing the usable floor area by the gross floor area. Restroom and storage are part of the usable floor area and should be included.

    Gang Chen, Author, AIA, LEED AP BD+C (GreenExamEducation.com)

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    Yvette Louka

    okay, thank you for clarifying. So what would not be included when calculating the building efficiency?

    Stairs, elevator shaft, ...?

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