The Elm Court Estate retains the title of the largest American Shingle Style home in the United States. The extraordinary Gilded Age Berkshire Cottage was built by William Douglas Sloane and Emily Vanderbilt, (granddaughter of Cornelius Vanderbilt), along with architects Peabody & Stearns in 1886. The gardens and landscape were designed by Frederick Law Olmsted. In 1919, the Elm Court Talks held at the home ultimately led to the creation of The Treaty of Versailles and League of Nations. Outbuildings include Butler and Gardener cottages, carriage house & stable, greenhouses & Caretaker's house and two barns. Significant renovations were accomplished in the early 2000s and continued work is necessary with an additional 8,000 sq. ft. of unrestored living space.