30.(1) If a person is the candidate of an authorized party both for the office of mayor and for that councillor of an electoral district, and if he obtains the greatest number of votes at the election for each of these offices, he is declared elected as mayor and his co-candidate, as district councillor.
The same holds true where that person obtains the greatest number of votes in the election for the office of mayor and where subsection 1 of section 27 applies.
(2) If that person does not obtain the greatest number of votes at the election for the office of mayor, but obtains them at the election for the office of councillor, or if subsection 1 of section 27 applies, he is declared elected to that office in preference to his co-candidate.