Kernrechtsfrage
What counts as 'gewachsenes Terrain' under cantonal building law?
Extrahierter Entscheid
As a rule, the relevant terrain is the natural terrain existing before construction begins, i.e. the terrain found on the parcel at the time of the permit application.
Extrahierte Begründung
The term is not defined in the ordinance, but its context in the rules on building height, floor area and plan submissions shows that the existing natural ground level is the reference point. A municipality may not redefine the cantonal concept differently in the exception procedure.