Also, I realized on the cook county assessor website my property valuation seem to be very undervalued.

You don't close until the property is delivered in the condition stipulated in the contract,l. Ie

I am very intrigued by the BRRRR method but my skills and expertise still lie in fix-and-flips.

Also check with the assessor's office if those extra basement areas are permitted.

There is very poor response for the rental and many of the homes are lying around for rental for 2+ months.

.$12K turn on large home, included new high quality carpet and full repaintHere lies the major deviation: Property type matters.....I have NO LARGE HOMES, I install NO CARPET.  

They'll lie to you, avoid you, dodge your phone calls, whatever it takes. 

Lying to two states and the federal government about taxes owed isn’t worth it. 

When I was looking into a similar situation I found the owners info on the county assessor's website, the property was owned by an LLC but I was able to look up the LLC on the secretary of state's website to find the owners info. 

I have access to the Recorder of Deeds records and Tax Assessor's records and I would be glad to help if you need any information on individual properties.