Know the building before you see the listing.

Search any address in Cook County to pull its assessor record, sale history, assessed values, and — inside Chicago — building violations and permits. Then run the numbers.

01 Building facts: units, sq ft, year built, condition
02 Every recorded sale and the price paid
03 Open city violations — red flags or bargaining power
04 Cash flow, cap rate, and cash-on-cash for your offer