Any 2 or more authorities may join or cooperate in the exercise of any or all of the powers conferred for the purpose of financing, planning, undertaking, constructing or operating a housing project or projects located within the area of operation of any one or more of the authorities.   [PL 1987, c. 737, Pt. A, §2 (NEW); PL 1987, c. 737, Pt. C, §106 (NEW); PL 1989, c. 6 (AMD); PL 1989, c. 9, §2 (AMD); PL 1989, c. 104, Pt. C, §§8, 10 (AMD).]