70 ILCS 1545/16

The city shall be obligated to make the contributions heretofore required of the park district under the park policemen's annuity act and the park employees annuity act in respect to park policemen and other park employees who are transferred under the provisions of this Act to the employment of the city. The park district shall be obligated to make the contributions heretofore required of the city under the appropriate annuity and benefit fund maintained by the city in respect to employees of the city who are transferred under the provisions of this Act to the employment of the park district.