Sec. 5.2. Vacancies in office.
Any city office shall be declared vacant by the Council upon the occurrence of one or more or the following events before the expiration of the term or such office:
   (1)   For any reason specified by statute or this Charter as creating a vacancy in office;
   (2)   If the officer shall absent himself continuously from the City for more than sixty days without the permission of the Council;
   (3)   In the case of any member of the Council, if such officer shall miss four consecutive regular meetings of the Council, or twenty-five per cent of such meetings in any fiscal year of the City, unless such absences shall be excused by the Council, at the time of each absence;
   (4)   Assumption by the officer of any office which is incompatible with the city office held by him.