The Art Students League of New York was designed by Henry Hardenbergh and completed in 1892. Other Hardenbergh designed buildings include The Dakota, Plaza Hotel and Willard Hotel. Thomas Eakins and Augustus Saint-Gaudens were founding Board Members. Many of the 20th century's most important artists have studied here including Thomas Hart Benton, Jackson Pollock, Alexander Calder, Helen Frankenthaler, Roy Lichtenstein, Maurice Sendak and Robert Rauschenberg. Joan Berkowitz specified D/2 Biological Solution for the cleaning of the limestone façade.