How ‘single exit stairway’ buildings could make cities better and safer

When it’s done, the building will barely register as new. The three-storey apartment complex will settle onto a leafy street as if it had always been there – faced in brick, its twin balconies nudging toward the sidewalk.

But inside, this project in an older Toronto neighbourhood will express radical ambition. Its design unmakes more than half a century of North American assumptions about fire safety, architecture and how to build cities. Designed by Toronto’s Office Ou, the six-unit building will only have a single staircase, not two as Canadian building codes usually require.