This is tough to generalize
Senior VP of Mortgage Lending
Because every lender is different and depending on if a purchaser is actually purchasing in Chicago Proper or Chicago Suburban it can very. 2 to 3% would be a good estimate. The best way to be more certain is to work directly with a mortgage lender to determine as closely as possible the amount of money you will need to bring to closing.
Please see the charts provided by bankrate.com http://www.bankrate.com/finance/mortgages/2012-closing-costs
In this chart are the estimated rates consumers should look for. Note not all lenders will charge all fees.
Quality Mortgage Lending
When making a mortgage loan application your lender will supply what is known as a Good Faith Estimate this will let you know within a few hundred dollars what you will need to pay at closing. I would suggest that assuming the Seller isn't making any contribution to the buyers closing costs, that in addition to the amount the buyer is putting down on the house that the average closing cost expense is likely to be in the range of 3%, however there is in fact no average per se. Just as each property is different, each buyer and loan is different and it's best to speak to a lender to get a realistic idea of what to expect.
We usually say 3%, and you will get numbers both as the closing gets closer and within the last day or two of the closing.
All of this on top of whatever balance of down payment you need for the loan, less the credit for any earnest money you provided.