The Department of Property and Supplies¹ shall have authority to convey any land so acquired or selected, or any lands now owned in connection with any State sanatorium, to The General State Authority for the purpose of having such authority erect and construct thereon and equip buildings for a new sanatorium or a new building or buildings to any existing sanatorium. The plans and specifications of any such sanatorium building or buildings, whether erected on land acquired directly by The General State Authority or by conveyance to it from the Commonwealth, shall be subject to the approval of the Department of Health, and shall provide for suitable buildings and an adequate water supply system, sewage treatment works, heat and electric power plant or plants, service lines, and other necessary equipment, structures, and improvements. The buildings shall be of modern design, plain and substantial, and capable of extension as the needs of the sanatorium may require.