Carolands Chateau is a , 4.5 floor, 98 room mansion on in Hillsborough, California. An example of American Renaissance and Beaux-Arts design, the building is a California Historical Landmark and is listed on the National Register of Historic Places. Carolands is one of the last of the houses built during the Gilded Age, a period of great mansion-building that included famous houses of the Vanderbilt family, such as Marble House, Biltmore Estate and The Breakers, and stately California houses such as Filoli and the Huntington family's mansions. History Harriett Pullman Carolan The woman who built Carolands, Harriett Pullman Carolan (1869–1956), was the daughter of George Pullman, a 19th-century industrialist, one of Chicago's wealthiest men, and founder of the Pullman Company, famous for its Palace railway cars. In Chicago in 1892, Harriett Pullman married Francis Carolan of San Francisco and moved with him to California. In 1912, she acquired of land in Hillsborough, on which she intended to build a house and garden that would excite "the wonder and admiration of America" and reflect her many refined and cultivated interests. The result was a masterpiece of Beaux-Arts architecture, inspired by the court architecture of Louis XIV. Carolan chose the site, the highest in the neighborhood, for its commanding views of the San Francisco Bay and the surrounding hills. Architects Harriett Carolan commissioned plans for the chateau from the Parisian architect Ernest Sanson, at the time France's foremost designer of prestigious private houses. Sanson was a classicist, and his design for the chateau's exterior was inspired by the 17th-century designs of François Mansart. He was seventy-six years old, near the end of a long and distinguished career, and never visited the California site. Carolan engaged the San Francisco-based Willis Polk, a distinguished architect in his own right, to be the structural designer and construction manager, instructing him to faithfully execute Sanson's designs. France's leading landscape architect, Achille Duchêne, designed Carolands' gardens. Duchêne's work was inspired by the works of the great 17th-century landscape designer André Le Nôtre, whose most famous creations included the gardens at the Palace of Versailles, Vaux-le-Vicomte and the Jardins des Tuileries. In his original, ambitious design for Carolands, Duchêne planned miles of roadways leading across extensive grounds, landscaped with thousands of shrubs and trees, accented by fountains and statuary. Only a small portion of the scheme was ever built. Construction Soon after Harriett Carolan secured the land in