Key legal question
Whether the tenants could again challenge the 2009 lease termination despite the final 2010 conciliation decision declaring the notice valid.
Extracted holding
No. The unappealed conciliation decision became final and has res judicata effect; the heirs may invoke it against the tenants.
Extracted reasoning
Under the former CO rules, a conciliation decision becomes final if not taken to court within 30 days. Res judicata applies when the same parties litigate the same claim based on the same legal ground and facts. As universal heir, the respondent succeeded to the landlord's position. Later shifts in his intentions did not reopen the already decided validity of the notice.