Dirty Damaged Apartment

[Elias Betondo]

I'm looking for some guidance on how to proceed with a few issues I am having with a tenant.  I am in the process of listing my 3 unit building for sale.  I had notified all tenants that we would be taking pictures of their apartments on a certain day, and to tidy up if possible.  When I got into this particular tenant's apartment I found trash scattered everywhere, the smell of marijuana, and multiple beds spread out in the living room.  When the lease was initially signed with the tenant, I was told that there would be 3 people living in the unit.  As of right now, it seems like there are 5 or more people in the apartment.  The place has been trashed, a few light fixtures have been broken, and one of the windows has been cracked.  I am pretty sure I have grounds for eviction, but wanted to get advice on the best way to approach.  

The apartment is in Elmwood Park IL which is located right outside of Chicago in Cook County.  Also, if any has worked with an eviction attorney in Cook County, I would greatly appreciate a referral.