Questão jurídica principal
Whether the purchaser of the leased property had to be substituted for the seller in the pending case under Art. 261 CO
Decisão extraída
Yes. The purchaser entered the pending proceedings in place of the seller because the case concerned the existence and prolongation of the lease, which continued to affect the tenancy relationship after the transfer.
Fundamentação extraída
A transfer of ownership during litigation triggers ex lege substitution where the proceedings concern a continuing tenancy relationship; the cantonal court had to treat the buyer as the proper party.