40 ILCS 5/8-230.2
An employee may contribute to the fund for, and receive credit for, all periods of service rendered to the Land Clearance Commission created by the employing city and thereafter abolished and superseded by the city's Department of Urban Renewal, except those periods for which he received credit in another public annuity and benefit fund or pension fund. Such service credit shall be paid for and granted on the same basis and conditions as applicable in the case of employees who make payment for past service under Section 8-230 provided that such employees also pay the current required employer contribution, but on the assumption that such employee's salary throughout all of his service with such Commission was at the rate of his salary at the date of his entrance into the service as a municipal employee after the abolition of the Commission.
40 ILCS 5/8-230.2