New Jersey Statutes Title 40A. Municipalities and Counties 40A § 4-56

A local unit may, if it so elects, enter into a contract for the purposes set forth in 40A:4-53 without advertising, provided the governing body shall, by resolution duly adopted by not less than 2/3 vote of the full membership thereof, determine that the services to be rendered are of a special technical nature and thus will not permit of special advertising. In the case of the purpose set forth in 40A:4-54, the provisions of general laws relating to contracts and public bidding shall control.