Universal City is an unincorporated area (also known as a county island) within the San Fernando Valley region of Los Angeles County, California, United States. Approximately 415 acres (1.7 km²) within and around the surrounding area is the property of Universal Pictures, one of the six major film studios in the United States: about 70 percent of the studio's property is inside this unincorporated area, while the remaining 30 percent is within the Los Angeles city limits. This 70 percent portion of the property remains unincorporated to avoid the City of Los Angeles' business taxes and regulations (the community has a building permit office on site in order to simplify the building process).Located within the area of Universal City is the Universal Studios Hollywood film studio and theme park and the Universal CityWalk shopping and entertainment center. Within the Los Angeles city limits are 10 Universal City Plaza, a 36-floor office building for Universal and NBC; the Sheraton Universal; and the Universal Hilton. The Metro Red Line underground station of the same name is located opposite the 10 Universal Plaza.