The information in this answer provided by Attorney Ranj Mohip is general information and is not intended as legal advice, nor does the attorney intend to create an attorney-client relationship with any reader by answering this question or otherwise contributing as a member of Trulia.com.
Most of the attorneys I have used or recommend charge anywhere from $400-$750. Make sure you use a real estate attorney as some different types of attorneys charge by the hour.
Congratulations on your purchase.
Typically, a real estate attorney in Chicago will run you around $500 for a respectable, skilled attorney. If you are interested in representation, please visit my website at http://www.chicagorelaw.com
Whether this is a new or vintage Condo building there are legal pitfalls you should be aware of. A detail oriented attorney who is getting paid a little better is more likely do the leg work on those issues and spend sufficient time with you to resolve those issues to your satisfaction.
Vintage you could probably get by with a 'closing attorney'. New construction I absolutely would NOT recommend it.
With all that said, by all means contact an attorney during the process if things get complicated. Do it early and fast if you suspect problems. In that case you'll be paying about $175/hr, but the $500 flat fee lawyers would help you with that stuff anyway.