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Be sure to use the Intersect tool to split the gymnasium walls at the low roof level. If you then run surface matching the bottom of the wall can have an interior boundary condition while the top can have exterior.

1. If you are using the diagram tool and you want to raise the gym up, use the push/pull tool in SketchUp after running the diagram.
2. To model a unique second floor plan, draw or import then second floor diagram after extruding the first floor, and then run the "Create Spaces from Diagram" tool a second time. You can run it as often as you want to add additional unique floors. Similar to the extruded roof you will need to intersect between the unique floors to get proper surface matching.

It sounds like you have looked at some tutorials yet, but wanted to link to this one in case you had not seen it.