The Department of Administration may lease or rent the vacant and unappropriated lands, swamplands, and lands acquired by the State by virtue of being sold for taxes, at such times, upon such consideration, in such portions, and upon such terms as it may deem proper. Every lease or rental of such lands by the Department shall be approved by the Governor and Council of State, or by the agency designated by the Governor and Council of State to approve such leases and rentals. (1959, c. 683, s. 1.)