Wind Mitigation Flat Roof Units?

The Wind Mitigation form states under Flat Roof:* Roof on a building with 5 or more units where at least 90% of the main roof area has a roof slope of less than 2:12. Roof area with slope less than 2:12 _*

What units are being referred to? Is this units a a multi-family dwelling? The wind mitigation form and interNachi course do not specify (as far as I can find) what is meant by this.
If it is units of multi-family that means that any home less than 5 units/apartments could never be marked as flat and would always be other. Is that correct?

Correct. if the “non-hip” features are more than 10% of the roof perimeter.

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