Questione giuridica chiave
Whether the refusal of the preliminary building sanction was an appealable final decision under Art. 87 OJ.
Decisione estratta
Because the authority refused the preliminary sanction rather than granting it, the decision ended the cantonal proceedings and was final for purposes of public-law appeal.
Motivazione estratta
A preliminary sanction is generally incidental, but a refusal of that sanction definitively closes the matter at cantonal level and is therefore a final decision.