The information in this answer is general information and is not intended as legal advice, nor do I intend to create an attorney-client relationship with any reader by answering this question or otherwise contributing as a member of Trulia.com. -
But also since you are still married, unless you have some sort of agreement in writing, any property you buy will be marital property. SO... I strongly advise you to discuss your situation with an attorney in Illinois. He/She will likely advise you not to close until your divorce is final.