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If you were manually drawing the geometry you could just add three spaces each with the three space types you need to a single zone. While not published I do have a version of the bar aspect ratio measure that takes space type ratios, and creates a core and perimeter model sliced up by space type. We have done some work with blending space types but it isn't in a clean measure. But here is how I would go about it.

1. Make a new blended space type
2. Loop through the other space types and move over all of the load instances
3. As you do this, assuming you are using LPD/EPD change the instance multiplier to s fractional value representing the portion that the soruce space type contributes with the blend. This avoids you having to manually merge schedules and also still gives you access to space type specific loads.
4. You have to take a different approach for ventilation.