The commission may make funds available for the erection of governmental institutional buildings in the district, and for the operation and maintenance of said governmental institutional buildings. The commission may assist non-governmental institutions in the raising of funds from any available source for the purchase of land in the district, and for the erection, operation and maintenance of institutional buildings in said district. It shall have those powers as stated in this act and such further powers as may be necessary to carry out the purposes and objectives of this act: Provided, however, That these powers are not inconsistent with charter provisions and state law. The powers granted in this act shall be in addition to powers granted to municipalities, the local legislative bodies thereof and other officials and bodies thereof under the statutes and local charters.