On August 24, 1901, 10 days after his divorce, Flagler married Mary Lily at her family's plantation, Liberty Hall, and the couple soon moved into their new Palm Beach estate, Whitehall, a 55-room beaux arts home designed by the New York-based firm of Carrère and Hastings, which also had designed the New York Public Library and the Pan-American Exposition. Built in 1902 as a wedding present to Mary Lily, Whitehall (now the Flagler Museum) was a 60,000-square-foot (5,600 m²) winter retreat that established the Palm Beach "season" of about 8–12 weeks, for the wealthy of America's Gilded Age.