Interesting piece on Don Mills (I don't know if it's paywalled):
https://www.theglobeandmail.com/real...rticle1004819/
An influence on Don Mills was not so much Levittown but the Eichler developments in California.
https://en.wikipedia.org/wiki/Joseph_Eichler
* Levittown was very blue collar, while Don Mills was more marketed to the professional/young executive set.