La Jolla's home prices are the most expensive in the nation, according to Coldwell Banker's annual home price comparison index. The study measures home values for select 2,200-square-foot, single-family homes with four bedrooms, 2.5 baths, a family room and two-car garage. Such a home costs $1.842 million in La Jolla, down 2 percent from last year. In second place is Greenwich, Conn., at $1.787 million, down 11 percent. In third is Beverly Hills, $1.77 million, down 19 percent. Of the most expensive 20 locations, 13 are in California. Behind Beverly Hills in fourth through eighth place are Palo Alto ($1.74 million), Santa Monica ($1.65 million), Newport Beach ($1.55 million), and San Francisco ($1.51 million). Other California locales in the top 20 are San Mateo, Palos Verdes, San Jose, Fremont, Oakland, and Long Beach.