Opinion by
(No. 58727;
First District (1st Division)
June 7, 1973.
Sheldon O. Zisook and Avrum Reifer, both of Chicago, for appeUants.
Richard L. Curry, Corporation Counsel, of Chicago, for appellee.
Robert L. Graham, of Jenner & Block, of Chicago, for intervenors-appellants.
Opinion by