735 ILCS 105/5-10
Any person may maintain an action or proceeding against a foreign corporation, non-resident, or foreign state if the action or proceeding arises out of or relates to any contract, agreement, or undertaking for which a choice of Illinois law has been made in whole or in part pursuant to Section 5-5 and that (i) is a contract, agreement, or undertaking, contingent or otherwise, in consideration of or relating to any obligation arising out of a transaction covering in the aggregate not less than $500,000 and (ii) contains a provision or provisions under which the foreign corporation or non-resident agrees to submit to the jurisdiction of the courts of this State. Nothing contained in this Section shall be construed to affect the enforcement of any provision respecting choice of forum in any contract, agreement, or undertaking.
735 ILCS 105/5-10