The following is from ChicagoTribune.com/homes recent sales:

$315,000 1/3/07
3855 W Monroe St, West Garfield Park, 60624
to Barbara Akintonde, from Charlson Clay

It's not always completely current, but it's the easiest to use site that's available to the public.

You can also go to the Cook County Assessor's office and locate the PIN (Property Identification Number) for the parcel, then go to the Cook County Recorder of Deeds site and look up filings by the PIN. That produces the same result as the search on the Tribune site. No later information than this as to deed transfers on 3855 W Monroe.

In many parts of the country, that kind of information is available on the county's web site a few weeks after the transaction closes.