File:Hillside in Irvington, New York.jpg

English: Built in 1889 for medical doctor Carroll Dunham, the Colonial Revival mansion house was designed for 34 rooms with 16 fireplaces, gables and bay windows, a large staircase, walls of mahogany panelling, and glass designed by Irvington resident Louis Comfort Tiffany. The grounds were designed by Charles Eliot, who also planned the Boston park system with later alterations by Frederick Law Olmsted, the co-creator of New York City's Central Park. The estate was sold shortly after Dunham's death in 1923 to Gordon Harris, the son of American Tobacco Company founder William R. Harris. Gordon Harris, then Vice President of the United States Lines shipping company, and his family lived on the estate until 1946 A caretaker maintained the estate until it was sold to Leonard Read. Reed used the estate to house his Foundation for Economic Education.