https://ca.finance.yahoo.com/news/immigrants-canadas-highest...
Even without students the numbers are pretty high comparatively. In contrast, "of all the metropolitan areas in the [United States], Miami had the highest rate of immigrant homeownership (26 percent), as well as the largest percentage of immigrants in its population (41 percent)."
https://www.nytimes.com/2018/11/15/realestate/immigrants-and...
And it's an great question why so many cities fail to take these steps. My guess is that inertia wins partly because it becomes politically inexpedient to blame immigrants for anything once cities have a certain percent of non-native residents, and partly because rising home prices make older homeowners happy while pushing the marginalized and disaffected younger voters into other ridings.
Preventing adequate construction is in the financial interest of current homeowners -- it inflates their property values due to artificial scarcity.
This won't change as long as city planners answer to those elected by existing residents.