A rare surviving example of the grand estates of the inter-war years, Parkwood consists of a richly decorated house set in 5 ha of grounds. The house, originally constructed in 1916-1917 to the designs of the Toronto firm of Darling and Pearson, was the home of Colonel Robert Samuel McLaughlin, President of General Motors of Canada. His wife, Adelaide, took a particular interest in the gardens designed by H.B. and L.A. Dunington-Grubb in the 1920s and in the magnificent formal garden constructed in 1935-1936 to the designs of John Lyle.