Stonewall Institute in Phoenix. Look for us on CitySearch. If you’ve come out of a residential drug and alcohol rehab and need more support to maintain your sobriety and learn tools for relapse prevention, continued recovery is available at the best outpatient rehab program in Phoenix. Stonewall Institute offers a surprisingly affordable Intensive Outpatient Program in an upscale environment. Our drug counselors understand what you are going through and will help guide you through your newly sober life. See us on CitySearch and read what our clients say about us. Check out our website at www.stonewallinstitute.com and call us today at 602-535-6468.