The Robert Treat Paine Estate, known as Stonehurst, is a country house set on 109 acres (44.1 ha) in Waltham, Massachusetts. It was designed for philanthropist Robert Treat Paine, Jr. in a collaboration between architect Henry Hobson Richardson and landscape architect Frederick Law Olmsted. It is located at 100 Robert Treat Paine Drive. Since 1974 the estate has been owned by the City of Waltham and its grounds kept as a public park, and is believed to be the only residential collaboration by Richardson and Olmsted that is open to the public.
In 1866, Boston lawyer Robert Treat Paine, Jr. (1835–1910) and his wife Lydia Lyman Paine commissioned architect Gridley James Fox Bryant to build a mansardedSecond Empire summer house in Waltham. The house and its site were paid for by George Lyman, Lydia's father and owner of an adjacent summer residence, the Lyman Estate. This house was deemed too small for the Paines and their seven children. In October 1883, Richardson and Olmsted made their first visit to the property to discuss relocating the house and expanding it. In July 1884, Olmsted and Richardson produced sketches for a new site atop a rocky ridge with sweeping views to the southeast. In the spring of 1885, construction began while the Paine family traveled to Europe with Phillips Brooks, a family friend and pastor of Trinity Church in Boston. When Richardson died at age 47 in April 1886, the commission was close to completion. The terrace and some interior finishes were completed over the summer.
Margaret Henderson Floyd, "H. H. Richardson, Frederick Law Olmsted, and the House for Robert Treat Paine", Winterthur Portfolio, Vol. 18, No. 4 (Winter, 1983), pp. 227–248.
Ann Clifford and Thomas M. Paine. Stonehurst, The Robert Treat Paine Estate: An American Masterwork by H.H. Richardson and F.L. Olmsted. Waltham, Massachusetts: Robert Treat Paine Historical Trust, 2007.