Child endangerment charges were filed against James Evans -- police said it is the 40th time Evans has been arrested -- for leaving his infant son on the steps of the building, the Chicago Sun-Times reported.
Witnesses reported seeing two people leave the baby on the steps of the building Thursday. Evans was arrested went he went to the Town Hall district police station at 11:45 a.m. Friday to report the child missing.
Illinois has a "Safe Haven" law that allows parents to give up newborns at specific locations within 30 days of birth. The archdiocese isn't a "Safe Haven" location because it doesn't have 24-hour staffing.
The state Department of Children and Family Services was investigating the incident.