Question juridique clé
Whether the thirty-meter forest setback must be deducted when assessing a zoning plus-value levy.
Solution extraite
Yes. Surfaces subject to the forest construction ban are not effectively buildable and must be excluded from the plus-value assessment.
Motifs extraits
The relevant advantage must be assessed concretely from the real and effective increase in value, not on a hypothetical basis. A possible derogation is too uncertain to treat the setback area as constructible.