(a) If the commission considers it advisable, the commission may lease space for a state agency under a contract that contains an option for the commission to purchase the space subject to the legislature's appropriation of money for the purchase.
(b) A lease contract containing the option must indicate:
(1) the amount that will accumulate and be credited toward the purchase at various times during the lease term; and
(2) the purchase price of the property at the beginning of each fiscal biennium during the lease term.