While you may be looking at a commercial transaction, that always doesn't apply to private individuals so check the usury laws and see how they may apply.Usury is an unlawful rate of interest.

Hopefully you punished the seller with discounts for the deferred maintenance.Hope this helps,Tevis

Once the days have passed, you can go to the small claims court and file for an unlawful detainer.

Character flaw, my grandfather taught never get even, get even 3 times, 1.to get even 2.to equal the original deed and place the doer where they put you 3. punishment for doing it in the first place.

So now let's look at the next law mentioned, 196(a) which is titled "Prohibited acts relating to lead-based paint, glaze or other substance; punishment; embargo of personal property" (sounds exciting, doesn't it?)

Then you’ve rewarded the agent who was wrong and punished the one that was right. 

You should run that report independently, and also search for legal actions (evictions & unlawful detainers), and any criminal convictions.As a former property manager to a few large apartment communities, I tell you that 90% of problems come from poor tenant screening.  

@Jordan Rodick  Selling real estate in Illinois without a license is punishable by a $25,000 fine for each offense. 

If you really don’t want them there any more, and they truly refuse to leave, you’d be forced to evict them (unlawful detainer action) to remove them. 

Also planning to serve 30-day notice to quit to the unlawful co-tenant on Dec. 31st.