--- title: Cornerstones Harbor | Residential Treatment for Young Adults description: Cornerstones Harbor is a four-phase residential treatment program for young adults in Portland, Maine, built for stabilization, skill-building, and a clear path toward independence. image: https://cornerstonesofmaine.com/hubfs/CRN%20featured%20images16.jpg --- [Go Back Up](https://cornerstonesofmaine.com/young-adults-residential-treatment#top) [Skip to Content](https://cornerstonesofmaine.com/young-adults-residential-treatment#body) [![CRN Logo5](https://cornerstonesofmaine.com/hs-fs/hubfs/CRN%20Logo5.png?width=300&height=67&name=CRN%20Logo5.png "CRN Logo5")](https://cornerstonesofmaine.com/) Toggle Menu - [Young Adult Programs](https://cornerstonesofmaine.com/young-adult-residential-transitional-living-programs) Toggle children for Young Adult Programs Main Menu (Press to Return) \> Young Adult Programs - [Residential Treatment](https://cornerstonesofmaine.com/young-adults-residential-treatment) - [Transitional Living](https://cornerstonesofmaine.com/young-adults-transitional-living) Toggle children for Transitional Living Young Adult Programs (Press to Return) \> Transitional Living - [Neurodivergent-Affirming](https://cornerstonesofmaine.com/neurodivergent-living-asd-autism) - [Independent Living](https://cornerstonesofmaine.com/young-adult-independent-living) - [Aftercare](https://cornerstonesofmaine.com/young-adult-aftercare) - [Young Adult Treatment](https://cornerstonesofmaine.com/young-adult-residential-transitional-living-programs) Toggle children for Young Adult Treatment Main Menu (Press to Return) \> Young Adult Treatment - [Psychotherapy](https://cornerstonesofmaine.com/psychotherapy-young-adults) - [Psychiatry](https://cornerstonesofmaine.com/psychiatric-medication-management) - [Executive Function Coaching](https://cornerstonesofmaine.com/executive-function-coaching) - [Relationship Coaching](https://cornerstonesofmaine.com/relationship-coaching) - [Art & Music Therapy](https://cornerstonesofmaine.com/art-music-expressive-therapy-young-adults) - [About Cornerstones](https://cornerstonesofmaine.com/about-young-adult-treatment-living) Toggle children for About Cornerstones Main Menu (Press to Return) \> About Cornerstones - [About Our Clients](https://cornerstonesofmaine.com/our-clients) Toggle children for About Our Clients About Cornerstones (Press to Return) \> About Our Clients - [Anxiety Treatment](https://cornerstonesofmaine.com/anxiety-treatment-young-adults) - [Depression Treatment](https://cornerstonesofmaine.com/depression-treatment-young-adults) - [ADHD Treatment](https://cornerstonesofmaine.com/adhd-treatment-young-adults) - [OCD Treatment](https://cornerstonesofmaine.com/ocd-treatment-young-adults) - [ASD Treatment](https://cornerstonesofmaine.com/asd-young-adult-living) - [Young Adult Treatment Homes](https://cornerstonesofmaine.com/young-adult-treatment-homes) - [Young Adult Treatment Team](https://cornerstonesofmaine.com/young-adult-treatment-team) - [Young Adult Treatment Careers](https://cornerstonesofmaine.com/young-adult-treatment-careers) - [Admissions](https://cornerstonesofmaine.com/young-adult-residential-transitional-living) Toggle children for Admissions Main Menu (Press to Return) \> Admissions - [Admission Inquiry Form](https://cornerstonesofmaine.com/young-adult-treatment-admissions-inquiry) - [FAQs](https://cornerstonesofmaine.com/treatment-transitional-living-faq) - [Verify Your Insurance](https://cornerstonesofmaine.com/young-adult-treatment-insurance) - [Resources](https://cornerstonesofmaine.com/young-adult-treatment-resources) Toggle children for Resources Main Menu (Press to Return) \> Resources - [For Parents](https://cornerstonesofmaine.com/parents-with-young-adults-struggling) - [For Young Adults](https://cornerstonesofmaine.com/transitional-living-young-adults) Toggle children for For Young Adults Resources (Press to Return) \> For Young Adults - [Life at Cornerstones](https://cornerstonesofmaine.com/young-adult-treatment-life) - [Blogs](https://cornerstonesofmaine.com/blog) - [Presentations](https://cornerstonesofmaine.com/young-adult-treatment-presentations) - [In The Media](https://cornerstonesofmaine.com/young-adult-treatment-media) - [Contact Us](https://cornerstonesofmaine.com/contact-young-adult-treatment#contact-form) ![Young Adult Residential Treatment Center in Portland, Maine](https://cornerstonesofmaine.com/hs-fs/hubfs/25-CRN-0206-Website36.png?width=1146&height=1250&name=25-CRN-0206-Website36.png) Cornerstones of Maine ## Cornerstones Harbor #### Residential Treatment at Cornerstones of Maine Cornerstones Harbor is a residential treatment program for young adults ages 18 to 30 in Portland, Maine. It is built around the idea that stabilization alone is not enough. From the moment a client arrives, the work moves forward through four structured phases, practical skill-building, and the kind of self-understanding that makes the next chapter possible.   ![Young Adults Looking for a Way Forward](https://cornerstonesofmaine.com/hs-fs/hubfs/25-CRN-0206-Website37.png?width=1146&height=1250&name=25-CRN-0206-Website37.png) ## What Is Cornerstones Harbor? Cornerstones Harbor is the residential treatment program at Cornerstones of Maine. It was developed to give young adults not just a place to stabilize, but a structured path toward insight, skill, and readiness for independent life. The program runs approximately four to eight weeks, depending on each client's progress, and is organized into four phases that build on one another. The focus is on helping young adults understand what is getting in their way, develop practical skills to address it, and arrive at the next step of treatment already knowing how to engage. ## The Four Phases of Cornerstones Harbor Every client moves through four phases at Cornerstones Harbor. Each phase has clear expectations and graduation criteria. Progress is not based on calendar time alone. It is based on demonstrating readiness. ### Phase 1: Stabilize The first phase is about safety, orientation, and assessment. Clients establish daily routines, complete clinical and psychiatric assessments, begin individual and group therapy, and settle into the structure of the program. The focus is on engagement and on building the foundation for the work ahead. ### Phase 2: Practice Clinical work deepens in Phase 2. Clients develop a clearer understanding of the patterns and behaviors that have created difficulty in their lives. Life skills work begins in earnest: vocational exploration, executive functioning, independent living tasks, and interpersonal skills. The emphasis is on repetition, guided practice, and honest feedback. ### Phase 3: Apply Phase 3 shifts from learning to doing. Clients apply their skills in real-world settings with decreasing staff prompting. They take on more responsibility for their own schedule, participate in community outings more independently, and begin building a clear picture of what comes after the program. Transition planning begins in earnest. ### Phase 4: Autonomize The final phase is about sustainability. Clients prepare for discharge by finalizing their transition plan, practicing the skills and routines they will need at the next level of care, and demonstrating they can function with minimal prompting. The goal is not completion. It is readiness. ## What Daily Life Looks Like Life at Cornerstones Harbor is structured and active. Clients follow a consistent daily schedule that includes individual therapy, group sessions, psychiatric care, and a life skills group that meets every day. Community outings are part of the program from early on: a trip into Portland, a wellness activity, or a recreational outing with peers. Life skills work is hands-on and practical. Clients work on everything from resume building and budgeting to meal planning, grocery shopping, and personal organization. It is adapted to each client's individual goals and carried forward into whatever comes next. ## Who Cornerstones Harbor Is For Cornerstones Harbor serves young adults ages 18 to 30 who need a higher level of structure and support before they are ready for transitional living or greater independence. Many clients arrive from home, from a therapeutic program, or from a higher level of psychiatric care. Common presentations include anxiety, depression, OCD, ADHD, autism spectrum differences, and co-occurring substance use. Cornerstones Harbor provides all-gender accommodations and is LGBTQIA+ affirming. Cornerstones Harbor is not the right fit for clients who are actively violent, who have a primary and untreated substance use disorder, or who require acute psychiatric hospitalization. ## What Comes Next Cornerstones Harbor is designed as the first step in the Cornerstones continuum. Many clients move directly into our transitional living programs upon discharge. By the time they graduate from Cornerstones Harbor, transitional living is not unfamiliar. They have already been doing the work. [Learn About Transitional Living](https://cornerstonesofmaine.com/young-adults-transitional-living) [Contact Admissions](https://cornerstonesofmaine.com/young-adults-transitional-living) ![CRN Logo4-1](https://cornerstonesofmaine.com/hs-fs/hubfs/CRN%20Logo4-1.png?width=220&height=135&name=CRN%20Logo4-1.png) ![All Kinds of Therapy](https://cornerstonesofmaine.com/hs-fs/hubfs/allkinds-300x300-1-150x150.webp?width=70&height=70&name=allkinds-300x300-1-150x150.webp) ![NATSAP](https://cornerstonesofmaine.com/hs-fs/hubfs/3-NATSAP-logo-300x300-1-150x150.webp?width=71&height=71&name=3-NATSAP-logo-300x300-1-150x150.webp) ![Safe Zone Project](https://cornerstonesofmaine.com/hs-fs/hubfs/safe-zone-project-logo.png-150x150.webp?width=72&height=72&name=safe-zone-project-logo.png-150x150.webp) ![YATA](https://cornerstonesofmaine.com/hs-fs/hubfs/5d38c2e2e4f440e3ddb75963_yata-logo-blue-150x150.webp?width=77&height=77&name=5d38c2e2e4f440e3ddb75963_yata-logo-blue-150x150.webp) ![CARF Gold Seal](https://cornerstonesofmaine.com/hs-fs/hubfs/CARF_GoldSeal.webp?width=75&height=75&name=CARF_GoldSeal.webp) ![CIPA](https://cornerstonesofmaine.com/hs-fs/hubfs/CIPA%20Submark%20Dark.png?width=72&name=CIPA%20Submark%20Dark.png) ###### [257 South Street, Biddeford, Maine 04005](https://www.google.com/maps/place/257+South+St,+Biddeford,+ME+04005/data=!4m2!3m1!1s0x4cb2a4e1ad6f7bdd:0x16e256096cc624b7?sa=X&ved=1t:242&ictx=111)   |  [tel:207-274-7340](tel:207-274-7340)[info@cornerstonesofmaine.com](mailto:info@cornerstonesofmaine.com) ###### [207-300-9851](tel:207-274-7340)   |   Fax: [888-395-4451](tel:888-395-4451) [Privacy Policy](https://cornerstonesofmaine.com/privacy-policy)   |   [Client Rights](https://cornerstonesofmaine.com/summary-of-client-rights)  |  [State of Maine License](https://cornerstonesofmaine.com/hubfs/State%20of%20Maine%20License.pdf) Cornerstones of Maine is a clinician-owned young adult behavioral health treatment organization serving ages 18-30 in Portland, Maine. ```json { "@context" : "https://schema.org", "@type" : [ "RehabilitationCenter", "LocalBusiness" ], "address" : { "@type" : "PostalAddress", "addressCountry" : "US", "addressLocality" : "Biddeford", "addressRegion" : "Maine", "postalCode" : "04005", "streetAddress" : "257 South Street" }, "email" : "info@cornerstonesofmaine.com", "geo" : { "@type" : "GeoCoordinates", "latitude" : "43.49311999139394,", "longitude" : "-70.47627961534256" }, "image" : "https://43771374.fs1.hubspotusercontent-na1.net/hubfs/43771374/CRN%20Logo-1.png", "logo" : { "@type" : "ImageObject", "url" : "https://43771374.fs1.hubspotusercontent-na1.net/hubfs/43771374/CRN%20Logo-1.png" }, "medicalSpecialty" : "Behavioral - Mental health", "name" : "Cornerstones of Maine", "sameAs" : [ "https://www.facebook.com/Cornerstonesofmaine", "https://www.instagram.com/cornerstonesofmaine/", "https://www.linkedin.com/company/cornerstones-of-maine/" ], "telephone" : "207-300-9851", "url" : "cornerstonesofmaine.com" } ``` ```json { "@context" : "https://schema.org", "@type" : "MedicalProcedure", "description" : "Cornerstones Harbor is a four-phase residential treatment program for young adults in Portland, Maine, built for stabilization, skill-building, and a clear path toward independence.", "name" : "Cornerstones Harbor | Residential Treatment for Young Adults", "provider" : { "@type" : "MedicalOrganization", "name" : "Cornerstones of Maine" }, "url" : "https://cornerstonesofmaine.com/young-adults-residential-treatment" } ```