More than 250,000 people are expected to move to Portland in the next 20 years. To accommodate all that growth, the city’s plan is to allow more duplexes and triplexes to be built in close-in neighborhoods. But some people say the new regulations will make building new housing financially impossible. And others say it will change the character of their single-family neighborhoods. City planner Joe Zehnder and Michael Andersen, senior fellow at Sightline, join us to break it down.