§ 22-c. Election and term of assessors in the town of Southampton, county of Suffolk. Notwithstanding the provisions of any general, special or local law, the town board of the town of Southampton, county of Suffolk, may by resolution subject to a permissive referendum, direct that at the first biennial town election held after this act takes effect, there shall be elected three town assessors for a term of four years and two town assessors for a term of two years each to begin on the first day of January next succeeding such election. If no referendum be demanded or if a proposition therefor be adopted by referendum, the assessors of such town shall be elected at such election in the manner set forth herein. Thereafter, each assessor shall be elected for a four year term.