Park Extension was a mid-20th century suburb. It was a rural area prior to the 1950s. Starting in the early 1950s there was rapid housing development in the northern reaches of Park Extension. A significant Jewish population migrated there, mostly from Le Plateau-Mont-Royal, and established a thriving community. Several hundred families built and maintained a synagogue, Congregation Beth Aaron. By the mid-1970s, the Jewish community was diminishing. Congregation Beth Aaron merged with the Beth Israel Congregation in 1986, and the building was sold. Despite this, the Jewish community still owns property and businesses on Beaumont; the southernmost part of Park Extension.