 The left side rooms were built later in the 17th century, using different roof construction techniques, as was a leanto section extending across the width of the house.The leanto was demolished in the early 20th century, but preservationist William Sumner Appleton was able to acquire some architectural elements for the collections of the Society for the Preservation of New England Antiquities (now Historic New England).The house was built either by John Brown Sr., who acquired the land in 1662, or his son Nathaniel, who was the next owner.