In any quasi-judicial hearing, the administrative body may retain an attorney to act as legal officer during the hearing. The legal officer shall exercise all the functions and powers of the presiding officer of the administrative body, as set forth in AMC 2.18.100. At the close of testimony the legal officer shall advise the administrative body of the law applicable to the matter which is the subject of the hearing, but the legal officer shall not otherwise participate in the deliberations of the administrative body. At the close of deliberations of the administrative body, the legal officer shall prepare the necessary findings of fact upon which the administrative body shall base its final decision in the matter before it.