Questione giuridica chiave
Whether the lease termination under Art. 257f(3) CO was valid despite the tenant's objections to the warnings and evidence of nuisance.
Decisione estratta
The termination was valid: the tenant had been clearly warned, persisted in disturbing conduct, and the nuisance was serious enough to make continuation of the lease intolerable.
Motivazione estratta
Written warnings and formal notice sufficiently identified the forbidden conduct and the risk of termination. Witnesses confirmed repeated, intense nighttime noise, shouting, object-breaking, and police interventions. Such conduct exceeds ordinary residential use and constitutes insufficient regard for neighbors under Art. 257f CO.