(a) Any land or facilities otherwise authorized to be acquired, constructed, or leased to carry out the purposes of the Act may be leased or subleased from Indian tribes for periods not in excess of twenty years.

(b) Leases entered into pursuant to paragraph (a) shall be subject to the requirements of section 322 of the Economy Act (40 U.S.C. 278a), which limits expenditures for rent and alterations, improvements and repairs on leased buildings.