Northfield
Sir Oliver Mowat (1820-1903) built this Georgian-style house in 1856 on land originally owned by Samuel Peters Jarvis. Mowat, one of the Fathers of Confederation, was Premier of Ontario (1872-1896) and Lieutenant-Governor of Ontario (1897-1903). In 1861 he sold the house to Edward Rutherford, an alderman and president of Consumers' Gas Company. It was occupied by Havergal College from 1913 to 1932 and by the RCAF during World War II. In 1946, the house became the Toronto headquarters of the CBC.
Plaque via Alan L. Brown's site Toronto Plaques. Full page here.