105 ILCS 5/10-22.12

To lease, for a period not exceeding 99 years, any building, rooms, grounds and appurtenances to be used by the district for the use of schools or for school administration purposes; and to pay for the use of such leased property in accordance with the terms of the lease. The board shall not make or renew any lease for a term longer than 10 years, nor alter the terms of any lease whose unexpired term may exceed 10 years without the vote of 2/3 of the full membership of the board.