Question juridique clé
Whether the appellants had standing to invoke arbitrary application of § 71 PBG/ZH and property protection
Solution extraite
The complaint was inadmissible on this point because the appellants did not show how the alleged deviation from the ordinary building rules affected their own legally protected interests.
Motifs extraits
Neighbor standing exists only for norms protecting neighbors; the appellants relied on general aesthetic objections and did not explain a concrete adverse effect.