Cornerstones of Maine is a clinician-owned behavioral-health organization offering residential treatment, transitional living, apartment living, and aftercare for young adults in Maine. Its public materials describe a continuum for young adults ages 18 to 30, with programming focused on clinical support, practical skill-building, education, work, and independent living (Cornerstones of Maine).

The program's public contact materials list 257 South Street in Biddeford, Maine. Its frequently asked questions describe residential treatment stays of 30 to 90 days, transitional living stays averaging about 10 months, and a staged private-pay cost structure, including a $2,000 daily rate for the residential treatment center and a $600 daily rate for transitional living (FAQ).

Cornerstones of Maine is also listed by the National Association of Therapeutic Schools and Programs as a Full Program member. The NATSAP listing describes Cornerstones as a clinically driven transition program for men, women, and gender-nonconforming young adults (NATSAP listing).