Except as may be otherwise provided by this Charter or by ordinance, the same person may hold more than one office in the City government. The City Administrator may hold more than one such office, through self-appointment, by the Council, or by other City authority having power to fill the particular office, subject to any regulations which the Council may make by ordinance; but the City Administrator may not receive compensation for service in other City offices and positions. Also the Council, by ordinance, may provide that the City Administrator shall hold, ex-officio, any designated administrative office or offices subordinate to the City Administrator, as well as other designated compatible City offices, notwithstanding any other provisions of this Charter.