Beverly Hills is a city in the western part of Los Angeles County, California, United States. Beverly Hills and the neighboring city of West Hollywood are together entirely surrounded by the city of Los Angeles. The area’s Platinum Triangle of wealthy neighborhoods is formed by Beverly Hills and the Los Angeles neighborhoods of Bel-Air and Holmby Hills. The population was 34,980 as of the 2006 census. Beverly Hills is bordered on the north by Bel-Air and the Santa Monica Mountains, on the east by West Hollywood, the Carthay neighborhood of Los Angeles, and the Fairfax District of Los Angeles, and on the south by the Beverlywood. Beverly Hills contains some of the largest homes in Los Angeles County and the nation. These homes range from the extravagant and luxurious in size, to the more elegant and modern homes, and then to the many small duplex rental units and detached homes with less than 3,000 sq ft (280 sq meters). The city's average household income is just over $87,000. In 2007, Coldwell Banker lists Beverly Hills as the most expensive housing market (second year in a row) in the United States, with a median home price of over $2.2 million. The name Beverly Hills has often been employed as a nickname for a fashionable, affluent area. For example, Ladera Heights, an unincorporated area in southwestern Los Angeles County, has been dubbed the Black Beverly Hills. Similarly, the city of Scottsdale has been given the nickname Beverly Hills of Arizona for its upscale shops, stately homes, and high household income. Calabasas, California located in the San Fernando Valley is considered the Beverly Hills of the valley. Respectively, Buckhead, the uptown district of Atlanta, has been dubbed The Beverly Hills of the East due to the large number (as well as the highest concentration) of upscale shops, elaborate homes, and high average income.