Possibly rename HeightAboveGround?
Looking at the values in the enumeration, there are now indeed some values that might fit better as Height_Below_Ground, e.g. the entry "bottomThermalBoundary" or "bottomOfConstruction"
I wonder whether the overall name heightAboveGround still holds or we should rename it (or add an equivalent property heightBelowGround to ADE_AbstractBuilding)...
Any comments?