Kernrechtsfrage
Whether the authority breached its duty of investigation by failing to verify the existing and possible number of houses/parcels.
Extrahierter Entscheid
Yes. The factual assumptions were not verified despite objections, and the appellate court had to establish the situation itself by parcel-by-parcel review.
Extrahierte Begründung
When such factual questions arise, the deciding appellate body must form its own view through direct verification. The authority's failure constituted a gross breach of the duty to investigate.