Kernrechtsfrage
Whether the landowner had a legally protected interest in the subsurface affected by the anchors under Art. 667 CC.
Extrahierter Entscheid
No protected interest was shown, because no concrete, reasonably foreseeable use of the subsurface was established beyond a purely abstract interest in compensation.
Extrahierte Begründung
The extent of ownership in depth depends on a protected interest in exercising the property right. Here, a future parking garage was only hypothetical and unrealistic in light of the monument status, public-law constraints, and planning limits; no other concrete use was identified.