BEST PRACTICE
Don't create multiple enclosures within a single plan region, i.e. only draw a single bounding area.
Don't hide plan regions with Visibility/Graphics. It can be very confusing and difficult to solve display problems if they are hidden (they are never printed so there is no need to hide them).
VISIBILITY & DISPLAY
Plan regions will not affect display of Topography elements (Topofsurface).
- try put a plan region around other elements (e.g. the building) to get the effect you want.