Questione giuridica chiave
Whether the cantonal court arbitrarily interpreted the Aargau best-ende safeguard by measuring permissible expansion from the pre-1992 lawful building stock rather than the post-1992 expanded state.
Decisione estratta
No. The court could lawfully rely on the lawful stock existing at the time of the rezoning; prior safeguard-based extensions do not reset the baseline for further expansions.
Motivazione estratta
Repeating the safeguard after each approved expansion would progressively intensify zoning nonconformity and undermine spatial planning. The cantonal view also aligned with federal case law on modest adaptations of originally lawful buildings.