The administrative officers of the city, except the City Attorney and the City Clerk insofar as their duties as attorney and clerk for the Council are concerned, shall, in the performance of the duties of their respective offices, be subordinate to and under the direction of the City Manager and shall report and be directly responsible to him. Except for the City Attorney all department heads and administrative heads shall not need to be city residents at the time of their hiring but shall live in the city within ninety (90) days after beginning work with the city and shall remain so during the tenure of their employment. The City Attorney shall not be required to become a resident of the City.