The Northshore Mall, originally known as the Northshore Shopping Center, is one of the region's largest shopping malls. The mall opened in September 1958 as an outdoor shopping center, and was built on farm land originally owned by Elias Hasket Derby, one of America's first millionaires. Centennial Park, an industrial park in the center of the city, has attracted several medical and technology companies. West Peabody, which was mostly farm land until the 1950s, has been developed into a middle-to-upper class residential area. Brooksby Farm, a working farm and conservation area has been one of the city's most popular destinations for decades.