This document provides a summary of 7 important websites that realtors need to know and use. The websites include: 1) The Cook County Treasurer website for property tax information 2) The Cook County Assessor website for certificate of error appeals and exemptions 3) The Cook County Clerk of Court website for past and pending cases 4) The Illinois Secretary of State website to check corporate status and ownership 5) The Cook County Recorder of Deeds website to check property records 6) The City of Chicago FOIA website to research building code violations and permits and 7) The ARDC website to look up lawyer information and status.