Linden Oaks opens Outpatient Center in Mokena Aug 2, 2018 | Press Releases Linden Oaks Behavioral Health has opened a new Outpatient Center in Mokena at 9697 W. 191st St. The Center is open Monday – Friday, 7:30 a.m. – 4 p.m.To access this content, you must purchase 1 Year Health News Illinois Subscription or 1 Year Group Subscription - Up to 5 Users, or log in if you are a member.