Del Mar comprises two sections: the small historic village adjacent to the beach west of Interstate 5 and a growing business center surrounded by multimillion-dollar tract housing east of the freeway. Tiny Del Mar Village, the smallest incorporated city in San Diego County, holds a population of 4,500 tucked into a 2.1-square-mi beachfront. It's known for its quaint half-timbered Tudor-style architecture, 2 mi of accessible beaches, and the Del Mar racetrack and San Diego County Fairgrounds complex. The village attracted rich and famous visitors from the beginning; they still come for seclusion and to watch the horses run. Its new face is the Del Mar Gateway business complex with high-rise hotels and fast-food outlets east of the interstate at the entrance to Carmel Valley. Both Del Mars, old and new, hold expensive homes belonging to staff and scientists who work in the biotech industry and at UC San Diego in adjacent La Jolla. Access to Del Mar's beaches is from the streets that run east-west off Coast Boulevard; access to the business complex is via Highway 56.