Tenant left personal property but did not leave keys

[Carrie B.]

My tenant owes me  several  months of rent, FINALLY he  has stated he have moved but did not leave keys and have left a lot of personal property.  I have a new tenant moving in soon and need to clean my unit.  I have changed the locks and is in the process of tossing out the tenants stuff.  What is  the legal ramifications is in Chicago for personal property?   

 I have nowhere to store his crap especially when he owes me so much back rent.  If i don't move forward with a new tenant soon loose my rental unit. 

Any advice??