Preventing "Missing Middle" housing reduces affordablity

Affordable-housing alliance to city: Legalize 'missing middle' in bikeable neighborhoods

Like discussed in this article about Portland, Eugene's code makes it difficult or impossible to build "missing middle" housing in many areas of Eugene. To confront our continued growth and build truly walkable and bikeable neighborhoods, our code needs to make it easier to build housing that is in-between single family homes and mid or high-rise apartments. 

Duplexes, triplexes, internal home divisions and two-story garden apartments are common throughout many of the neighborhoods Portland built in the early 20th century. Today, those neighborhoods are the city’s most walkable, bikeable and transit-friendly — but since 1959, city code has made it illegal to build more neighborhoods like that.
— Michael Andersen, Bike Portland