Homes are the key to health and Toronto’s ultra tight vacancy rate means the city should focus on building new units in the fight to end chronic homelessness, according to a leading U.S. public health expert.

“Toronto has to figure out, under the circumstances of Toronto, what works,” said Dr. Mitchell Katz, head of New York City’s Health and Hospitals corporation and the former head of the Los Angeles County Department of Health Services. “But what is needed and was needed in LA and needed in San Francisco is the commitment that we do not find it acceptable to house people in shelters and on the street.”