Denial of complaint in enforcement of arbitral award proceedings. First-instance judge's understanding that "the choice of the 1st Conciliation and Arbitration Center as arbitrator between the parties, given that the judgment creditor is a legal entity from the real estate sector, suffers from a defect of absolute nullity, which may be recognized even ex officio, as it is eminently partial." First-instance judgment set aside due to absence of demonstration of bias or lack of impartiality of the arbitrators: