Torrey Pines is a community of 2,600 acres (1,100 ha) in the northern coastal area of San Diego, California, residential with large areas of office space along I-5. The large office, retail, entertainment and academic facilities in University City a.k.a. UTC (over 9 million sq. ft. of office space), Sorrento Mesa/Sorrento Valley (also over 9 million sq. ft.), Torrey Pines (over 2.6 million sq. ft.), and Del Mar Heights/Carmel Valley (over 4.4 million sq. ft.), together form San Diego's "North City edge city", edge city being a major center of employment outside a traditional downtown.