In lieu of procedure by the Department of Property and Supplies¹ for obtaining and paying for preliminary surveys, plans, and estimates for the construction of the said hospital, and the improvement of the grounds connected therewith, and for the erection and financing of the erection of the same, the Secretary of Property and Supplies may convey the tract, so acquired, in fee to the General State Authority, and in such case, the Department of Property and Supplies, upon the undertaking by the General State Authority of the construction of a building or buildings for the said hospital, may enter into a contract to lease, as lessee, and, upon completion by the Authority of such construction, shall enter into a lease, as lessee, of the same for a period of not exceeding thirty (30) years, at an annual rental to be fixed and determined by the Authority, and, upon the commencement of the term of the said lease, the Department of Property and Supplies shall turn over the said hospital to the Department of Welfare for management, and for the care, maintenance, and treatment of psychiatric patients, pursuant to the intent of the act hereby amended.