Summerlin is a 22,500-acre (9,100 ha) affluent master-planned community under development by The Howard Hughes Corporation in the Las Vegas Valley of Nevada near the Spring Mountains and Red Rock Canyon National Conservation Area. It lies partially within the city limits of Las Vegas, Nevada, and in unincorporated Clark County. Summerlin, named for Howard Hughes’ grandmother, Jean Amelia Summerlin, ranked as the country’s best-selling master-planned community for more than a decade by Robert Charles Lesser & Co. and continues to rank among the top ten best-selling communities in the country some 19 years after development first began. The community includes a variety of land uses, including: residential, commercial, recreational, educational, medical, open space, and cultural. As of November 2010, Summerlin's population was nearly 100,000.