Any county owning and operating a county hospital under the authority of Kan. Stat. Ann. § 19-1860 et seq., and amendments thereto, is hereby authorized to lease such hospital buildings and site together with any personal property of the county used in connection with the operation of said hospital to the state board of regents and the state board of regents is hereby authorized to lease such building and site from such county. The state board of regents and the board of county commissioners of such county are hereby authorized and empowered to enter into a lease for such hospital buildings and site for a term not exceeding ninety-nine (99) years upon such terms and conditions and for such rental as the state board of regents and the board of county commissioners of the county deem to be in the best interest of the state of Kansas and such county. Such lease shall be executed on behalf of the state board of regents by the chairperson of said board, and shall be attested by the secretary of said board. No such lease shall be executed until the same has been approved by the attorney general.