This is what North York Centre looked like in 1947.
http://jpeg2000.eloquent-systems.com...47_it0008c.jp2
Not completely farmland but essentially the whole area was under development at that time and aside from the street grid, rather suburban. It was a lot different from how it is now.
It's also interesting watching Northdale in K-W. This used to be an early (1945-1965 mostly) suburban neighbourhood with Levittown and ranch style homes and strip malls next to two universities.
In the last 5 years, some 10,000 bedrooms worth of housing geared towards university students (but not dorms) has been built there, in an area of about 0.5 square miles. There's another 5,000 bedrooms under construction and thousands more planned. The quality is increasing from bland stucco boxes to higher quality modern designs. You're also seeing more condo (rather than rental) buildings, more 1-2 bedroom units (rather than 5) and some buildings with ground floor retail.
I don't know how many other examples there are where a suburban SFH neighbourhood has been upzoned in its entirety, including allowing retail/mixed use, with such low parking requirements (0.2 spots/bedroom). Although the development is still geared towards students, it has great transit with about a dozen bus routes converging on the neighbourhood, including 3 express routes, and a future LRT line at the edge of the neighbourhood. It has great (transit) access to the downtowns, tech sector jobs, university jobs, hospitals, malls... Honestly I can't even think of a place someone might want to go to that isn't well connected (no transfers, often express service) to Northdale by transit, including many suburban destinations, so I think it could eventually appeal to a broader demographic interested in the convenient location of the neighbourhood and good transit.