Robert West (1816-1884) arrived in the young village of Thornhill in 1833, having emigrated from England the same year. Some years later, he purchased a property on the east side of Yonge Street and opened a general merchandise store. (Robert West Lane now runs besides that very building on the Markham side of Yonge Street.)In the summer of 1843, Robert West started to build a one and a half storey frame house almost directly across the street from his store. After the house was built, he actually purchased the property in 1849 for 50 pounds and twenty years later the lot to the south for $100. While the house has undergone some changes over the years, the additions have remained faithful to its rural Neoclassic style.Mrs. Keith's great-grandmother first inherited the property; then it passed to her daughter Mary Emma West, then to Albert Charles Fawcett West and then in 1955 to his daughter, now Mrs. Keith. The house bears the distinction of being the only 19th century home in this area to have been occupied by the same family since the time of its construction.Over 160 years later, both the house and the building of the original store still stand where constructed, seemingly in defiance of the drastic change that has happened around them.The remarkable preservation of the West house, and the many records from the family, the store and other historical pieces that have been retained to this day, are indicative of the value that the family placed on their own history and that of Thornhill. This reverence for history has been continued by Katherine Louisa Keith since she moved into the home of her great grandfather in 1949, and has lovingly preserved it ever since.The Robert West House was designated significant for heritage under the Ontario Heritage Act in 1982 based on its architectural value. The house is listed on both the Canadian and Ontario Inventory of Historic Buildings.