Sec. 15. A lease executed under this chapter may provide for the payment of the lease rental in one (1) of the following ways:
(1) Entirely from the levy of taxes.
(2) Entirely from the net revenues of the hospital of which the leased building or buildings are a part.
(3) In part from the levy of taxes and in part from the net revenues as fixed and set forth in the lease.
(4) From a cumulative building fund established by the lessee under any of the following:
(A) IC 16-12-16 (before its repeal on July 1, 1993).
(B) IC 16-12.1-4-4 (before its repeal on July 1, 1993).
(C) IC 16-22-5.