(c) Vacancy. In the event the office of Mayor shall become vacant for any cause or reason, the office of Mayor shall be filled according to the following order of succession: Council President unless he or she is unable or declines to serve as Mayor, then the Council members at large in descending order of longevity in service unless all Council members at large are unable or decline to serve as Mayor, then the ward Council members in descending order of longevity unless all ward Council members are unable or decline to serve as Mayor, then the Director of Finance unless he or she is unable or declines to serve as Mayor, then the Director of Law.