Questão jurídica principal
Whether the extraordinary termination for unauthorized sublease was valid.
Decisão extraída
Yes. The tenant had definitively left the premises and abused the subletting right; the landlord could validly terminate under Art. 257f para. 3 CO.
Fundamentação extraída
A landlord may terminate extraordinarily when the tenant breaches the law or contract. Unauthorized subletting can justify termination if the landlord could lawfully refuse consent and the tenant no longer intends to resume occupation. The appellate court relied on facts unsupported by proof, whereas the established facts showed a durable relocation to France and rejection of repeated demands to return.