Kernrechtsfrage
Whether Solothurn law recognizes an expropriator's right to extend expropriation to the whole parcel.
Extrahierter Entscheid
No. Solothurn law does not provide such a right, and it cannot be inferred from the cited provisions.
Extrahierte Begründung
The relevant provisions contain no rule on an extension right. Such a right conflicts with the expropriation principle that no one must cede more rights than necessary for the public project, and it may exist only where the legislature expressly provides for it.