Kernrechtsfrage
Whether the extraordinary lease termination was valid under tenant-duty provisions regarding consideration for neighbors.
Extrahierter Entscheid
The landlord failed to prove repeated violations of the tenant's duty of consideration after written protest, so the termination was ineffective.
Extrahierte Begründung
The cantonal court could treat the neighbors' complaints and police reports as insufficient proof; the Supreme Court would not re-assess evidence or factual findings on reform appeal.