Kernrechtsfrage
Whether the lease termination under Art. 257d CO was valid despite being sent before expiry of the payment deadline.
Extrahierter Entscheid
Yes. The notice of termination was received only after the payment deadline had expired, and no payment had been made by then; the termination was therefore valid.
Extrahierte Begründung
A landlord must wait until the payment period fixed in the warning has expired, but a termination sent before expiry is still valid if the tenant receives it only afterwards and has neither paid nor been prevented from paying by the landlord's conduct.