San Diego Regional Center's East County office on Cuyamaca Street in Santee is one of four satellite locations serving individuals with developmental disabilities across San Diego and Imperial Counties. As one of 21 regional centers authorized under California's Lanterman Developmental Disabilities Services Act, the Santee office coordinates Individual Program Plans covering residential placement, behavioral intervention, and early-childhood services that intersect with inclusive programs at providers such as The Children's Courtyard of Santee on Cuyamaca Street. Eligibility extends to individuals diagnosed before age 18 with intellectual disability, cerebral palsy, epilepsy, autism, or conditions requiring services similar to those needed by persons with intellectual disability. The Early Start program serves infants and toddlers from birth through age three who demonstrate developmental delays in cognitive, communication, social-emotional, physical, or adaptive domains. Service coordination spans case management, respite care, supported employment, transportation, and residential services, all organized through the same Cuyamaca Street corridor where Santee City Hall and other civic agencies maintain East County operations on Magnolia Avenue. The Santee office processes eligibility assessments using the Vineland Adaptive Behavior Scales and ADOS-2 diagnostic protocols, generating Individual Program Plans that authorize service budgets calibrated to five-tier need classifications.