St Johns Riverside Hospital – Greenburgh Addiction Treatment Services GATS is an addiction treatment center located at 30 Manhattan Ave, White Plains, NY 10607. This facility offers comprehensive mental health services and support for individuals facing addiction challenges. Operating hours are Tuesday through Friday from 7:30 AM to 7 PM, with weekends closed. For more information, you can contact them at +19146835311 or visit their website at riversidehealth.org.