The Department of Developmental Services is responsible for the operation and maintenance of the facilities under its control, including the four state-owned and operated 24-hour care facilities and their buildings, grounds and infrastructure. These Developmental Centers are: Fairview (Orange County), Lanterman (Los Angeles County), Porterville (Tulare County), and Sonoma (Sonoma County) and comprise approximately 4.7 million gross square feet on 1,948 acres. The facilities are used to aid the Department's mission to provide medical, dental, and nursing care; supervision; active treatment; education and vocational training for residents with developmental disabilities. The Department also leases one small state-operated community facility but is not responsible for infrastructure or maintenance of this facility. Currently the Lanterman Developmental Center is scheduled for closure in December 2014.