A postwar suburb with one much older corner
Scarborough was mostly rural for a hundred years and then built extremely fast. The population doubled from 48,000 to 110,000 between 1950 and 1955 and tripled again by 1970, with the pace accelerating after Highway 401 opened in 1956. That leaves a huge stock of 1950s and 1960s detached houses, bungalows and split-levels on nailed plywood subfloor, all now well past the age where those connections stay tight. Cliffside is a clean example, developed as a large-scale suburban subdivision in the early 1950s on former farmland and a golf course. Birch Cliff is the outlier and worth calling out: it was the first part of Scarborough to be developed, as a streetcar suburb in the 1920s rather than an automobile suburb after the war, so its floors are a generation older than its neighbours.