Seattle, a city known for its density and smart urban planning, is leading the charge; however, after several years of unchecked micro-unit development, the city’s residents are pushing back against the trend.

A 2012 article in Seattle Magazine debated the pros and cons of unchecked micro-unit development and stirred up controversy. The pros? Micro-units are (relatively) affordable, often located in walkable neighborhoods and use fewer resources and less energy. But some Seattle residents complain the units cause parking problems and attract transient residents who don’t contribute to a rooted community. Up to now, Seattle’s code didn’t distinguish micro-units from other multi-family development, which meant the housing could pop up anywhere. But the City recently proposed new measures, which include requiring design review for micro-housing and congregate residences based on square footage, rather than the number of dwelling units; setting a minimum size for common areas; and raising the minimum requirements for parking.