Questione giuridica chiave
Whether the federal appeal had become moot after the applicant withdrew the building permit request.
Decisione estratta
The appeal was moot because the withdrawal of the permit application rendered the challenged permit and the prior cantonal decisions without object.
Motivazione estratta
The respondent's declaration was interpreted as a withdrawal of the application for building permission. This extinguished the subject matter of the appeal and also deprived the lower-court decisions of their object.