Questão jurídica principal
Whether the termination for rent default under Art. 257d CO was valid despite late payment.
Decisão extraída
The termination was valid because the arrears were paid only long after the 30-day deadline and no special circumstances made the notice contrary to good faith.
Fundamentação extraída
The landlord complied with the formal notice-and-term requirements of Art. 257d CO. The subsequent payment did not cure the default in time, and the tenant showed no exceptional circumstances justifying annulment under Art. 271 para. 1 CO.