The proceeds from the sale of bonds issued pursuant to this Act shall be used for making permanent improvements at State owned mental health and other public welfare institutions.
     As used in this Act, the term “permanent improvements” means and includes construction of buildings, enlargement and rehabilitation of existing buildings, with fixed equipment installed; preparation of plans and specifications therefor; land acquisition; landscaping and construction of sidewalks, roads, driveways and parking space; and all other things necessary for completion of construction of buildings and grounds in connection therewith.