In 1912, the Dunsmuirs engaged the American landscape architects Franklin Brett and George D. Hall of Boston, students of Frederick Law Olmsted, to develop a landscape for the entire site. They prepared a classic design for an Edwardian park that included the overall layout for the entire property. The plan organized the estate into four distinct landscape zones, progressing from a series of nine formal 'garden rooms' near Hatley Castle, to recreational spaces, then to agricultural lands, and finally to the forest surrounding the estate.