Notwithstanding any other provisions of this Act [sections
1941 to
1941y of this Appendix], the Commission may, after securing the advice of the Attorney General as to whether the proposed lease would tend to create or maintain a situation inconsistent with the antitrust laws, enter into leases for the alcohol-butadiene facilities for a period of not less than one year, nor more than three years: Provided, That any such lease shall contain among other things