Question juridique clé
Whether the attic residential use must be excluded for the small area lying within the setback line.
Solution extraite
No. The small portion inside the setback could still be included in the residential conversion; excluding it would be disproportionate and the neighbor lacked a protected interest in that restriction.
Motifs extraits
Only about 1.5 square meters lay within the setback. The change caused no relevant additional burden, and the neighbor could not successfully oppose the residential use of the remaining attic area. The ban requested would have been merely punitive.