Sec. 1C. ALTERNATIVE RETIREMENT PLANS. (a) In this section, "salary-based benefit plan" means a retirement plan provided by the pension system under this Act that provides member benefits that are calculated in accordance with a formula that is based on multiple factors, one of which is the member's salary at the time of the member's retirement.

(b) Notwithstanding any other law, including Section 8H of this Act, and except as provided by Subsection (c) of this section, the pension board and the city may enter into a written agreement under Section 3(n) of this Act to offer an alternative retirement plan or plans, including a cash balance retirement plan or plans, if both parties consider it appropriate.

(c) Notwithstanding any other law, including Section 8H of this Act, and except as provided by Subsection (d) of this section, if, beginning with the final risk sharing valuation study prepared under Section 8B of this Act on or after July 1, 2027, either the funded ratio of the pension system is less than 60 percent as determined in the final risk sharing valuation study without making any adjustments under Section 8E or 8F of this Act, or the funded ratio of the pension system is less than 60 percent as determined in a revised and restated risk sharing valuation study prepared under Section 8B(a)(8) of this Act, the pension board and the city shall, as soon as practicable but not later than the 60th day after the date the determination is made:

(1) enter into a written agreement under Section 3(n) of this Act to establish a cash balance retirement plan that complies with Section 1D of this Act; and

(2) require each employee first hired by the city on or after the 90th day after the date the cash balance retirement plan is established to participate in the cash balance retirement plan established under this subsection instead of participating in the salary-based benefit plan, provided the employee would have otherwise been eligible to participate in the salary-based benefit plan.

(d) If the city fails to deliver the proceeds of the pension obligation bonds described by Section 8C(j)(1) of this Act within the time prescribed by that subdivision, notwithstanding the funded ratio of the pension system, the pension board and the city may not establish a cash balance retirement plan under Subsection (c) of this section.