Alan Durning, Executive Director of Sightline Institute rights,  “You can’t build your way out of a housing affordability problem.” That’s conventional wisdom. I hear it all the time: Prosperous, growing, tech-rich cities from Seattle to the Bay Area and from Austin to Boston are all gripped by soaring rents and home prices. But what if you can build your way to affordable housing? What if, in fact, building is the only path to affordable housing? What if cities around the world have been building their way to affordability for decades?