Kernrechtsfrage
Whether a lease termination served on an outdated official form is null
Extrahierter Entscheid
No; the old form remained valid because it still gave the tenant the information needed to challenge the notice or seek extension, so nullity would be excessive formalism.
Extrahierte Begründung
Art. 266l CO and Art. 9 OBLF require information enabling the tenant to act; since the tenant received sufficient notice of the competent authority and deadline, the purpose of the rule was met despite the obsolete form.