The Mayor shall have been a resident of the City for at least one year prior to his election and shall be an elector of the City at the time of his election and during his term of office. The Mayor shall hold no other elective public office or employment with the City, except that of member of the county central committee of the political party of which he is a member or that of delegate to a state or national political party convention of the political party of which he is a member and as otherwise allowed by this Charter.