The first of three houses designed by Charles Bulfinch for Harrison Gray Otis is located on Cambridge Street in Boston. Otis was a Federalist lawyer and politician who became one of the wealthiest men in Boston in the early nineteenth century, developing the area of Beacon Hill. His brick house, with brownstone stringcourses, displays distinctive traits of the Federal style, including the semicircular window and side lights of the entryway on the first floor (added after 1801), the Palladian window on the second floor and the semicircular, or lunette, window on the shorter third floor. The Otis House‘s design was based on a house that Bulfinch saw in Philadelphia in 1789, the William Bingham House, which in turn was based on a house in London. By the 1830s, the Otis House had been subdivided and rented out and later became a boarding house. In 1916, restoration of the house was begun by the Society for the Preservation of New England Antiquities (Historic New England), which moved the house about 40 feet from its original location in 1926, to save it from a widening of Cambridge Street. Today the house is attached to additional buildings to the rear and serves as a museum and headquarters of Historic New England.