205 ILCS 620/1-7

(a) Any corporate fiduciary may establish branch offices at any location. Any corporate fiduciary that seeks to establish a branch office shall, if it is a trust company, apply for and obtain approval for the branch office from the Secretary. (b) Any trust company that proposes to establish a subsidiary, whether by incorporating the subsidiary or by acquiring the subsidiary, shall apply for and obtain prior approval from the Secretary 60 days prior to commencing business by the subsidiary, if newly incorporated, or prior to its acquisition, if it is acquired, provided the Secretary may specify circumstances and conditions when a trust company may directly or indirectly acquire a subsidiary without prior approval.