The City Attorney shall perform all duties and exercise all powers which shall be imposed or conferred upon him by ordinance or resolution of Council; and, except as otherwise provided in this Charter, he shall:
(1) Act as legal adviser and attorney for Council, the Mayor, Municipal administrative boards or commissions for which legal counsel is not otherwise provided and any other Municipal officers or employees in the performance of their official duties; and upon request he shall furnish Council, the Mayor and such administrative boards or commissions a written opinion upon any question of law concerning any affairs of the City;
(2) Except as other counsel are provided by competent authority, prosecute all actions for and defend all actions against the City; and prosecute all cases brought before or appealed from the Municipal Court, and perform the same duties so far as they are applicable thereto as are required by law of prosecuting attorneys; and
(3) Maintain and preserve as permanent records of the City Attorney's office all legal files, records and papers pertaining to the business of the office and the legal affairs of the City for which he is responsible.