Harrington Lake Diefenbaker suggested that he needed a quiet place to go fishing, not too far from Ottawa. Later that year, Harrington Lake was chosen as the site for an official country residence and the buildings were formally designated as a secure residence for Canada’s prime ministers. During the first prime ministership of Pierre Trudeau, his then-wife, Margaret, added a vegetable garden; according to Kim Campbell's autobiography "Time and Chance", the garden still provided the house with fresh produce at the time of that writing. Campbell was the only Prime Minister to have spent her entire term in office residing at Harrington
24 Sussex Drive of the house is a mid-century modern take on Norman Revival architecture. When originally built, it was very much of the Victorian (Queen Anne) style; it had high gables, extensive verandahs, and a liberal use of gingerbread trim. A turret was added by the Edwards family in 1907. After it was decided in 1950 the house would become the official residence of the prime minister, the turret, widow's walk, trim, main gable at the front, verandahs, and porte-cochère were removed and an extension added to the east. The interior was gutted, save for part of the dining room. The National