Action to annul an arbitral award. Party whose real property purchase and sale agreement was rescinded. Arbitral award ordering such party to pay condominium fees. The action to annul is upheld, given that the condemned party no longer had standing as defendant to be held liable for such payments. Standing of the construction company as defendant. Obligation to bear condominium expenses arising from the transfer of possession of the property through delivery of the keys. Nullity of the arbitral award: