(a) The authority is directed, as soon as it deems it feasible to do so, to set aside sufficient land on Jekyll Island to provide a suitable plot for each county in the state for use for charitable purposes.

(b) The authorities having charge of the fiscal affairs of any county desiring to use such plot shall file with the authority a proposal setting forth the use to which such plot is to be placed, the person or persons to have charge and control of the same, and the nature of improvements to be placed thereon. Such proposal shall also disclose how funds are to be secured for the improvement and operation of the facilities.

(c) If the authority deems such proposal to be in the public interest and to the advantage of the state park, it may lease such plot for a period not exceeding 20 years to the fiscal authority of such county or to properly appointed trustees. Such lease shall provide such restrictions, covenants, and conditions as the authority deems proper and shall provide for the termination of the lease upon violation of the provisions of the lease.

(d) Should the authorities having charge of the fiscal affairs of any county fail to claim and present a plan to improve on or before March 1, 1960, the plot of land set aside for such county under this Code section, the authority shall be under no further obligation to furnish any such plot of land on Jekyll Island.