I can only guess this may be a flowering crabapple. the grey/green blotches may be lichen moss which will live on the branches, but is harmless. There is a more local Extension Office to you located at One Prairie Office Center, Suite 208 4749 Lincoln Mall Drive Matteson, IL 60443 Phone: 708-679-6889 FAX: 708-679-6855 Hours: Monday - Friday 8 am to 4 pm
I believe they are on the East end/side of the building.
You should confirm the plant identification with them and any needed plant management strategies.