It would be nice to have a level which displays all (or specific) levels below it regardless of the elevation of those levels.

I would use this feature create a plan view to send to a contractor for a rough estimate. My house has multiple levels on the ground floor due to the terrain on which it was built. For example, the kitchen is 18" above the living room!

In general, this might be useful to others who have a multi-level house with rooms adjacent but not on separate floors (storeys).