70 ILCS 1545/13
The park policemen's annuity act and the park policemen's annuity fund shall be continued to the end that the annuity rights and credits of eligible members, contributors and annuitants shall be preserved.
Annuitants and recipients of disability benefits thereunder on the effective date shall continue to receive their benefits in accordance with its provisions. Such disability beneficiaries, however, upon termination of their disability, shall be transferred to the employment of the city in accordance with the provisions of Section 4.
Persons who are members of the park policemen's annuity fund on the effective date, but who are then not in the actual employment of the park district, having service credits sufficient to vest in them a right to a retirement annuity, shall be entitled to receive such annuity under said act upon attainment of retirement age or upon fulfillment of such other conditions necessary to qualify them for receipt of annuity.
Members of the park policemen's fund on the effective date who are not then in actual employment of the park district, having service credits insufficient to vest in them a right to a retirement annuity, shall have such credits preserved if subsequent to the effective date and without intervening employment by the park district, the city or any other governmental unit in the State which provides retirement plan protection, they are employed by the city as policemen, and, in such event, they shall remain members of the park policemen's annuity fund.
If the park policemen's annuity fund is merged into and superseded by the city policemen's annuity fund by action of the 71st General Assembly, the rights granted by this Section to members, contributors, annuitants and other persons shall be preserved in the administration of the city policemen's annuity act.
70 ILCS 1545/13