In my previous home in Montgomery County, MD we had very progressive housing rules in place. If a developer wanted to increase density in a development, he had to offer low income rentals and housing that looked the same as the full price models. It breaks up the impact of section 8 housing, where all the tenants suffer from the grinding effects of poverty. It helps middle and upper class kids gain insight into the problems experienced by their less fortunate peers and prevents the shunting of the less fortunate into under performing schools. Oregon looks liberal  on the surface but is pretty red in many of its practices and laws. There's always a complaint about helping people through government intervention even among those who you'd expect to be more open to such. Now is the time to put the rules that will protect the working and middle class from being displaced by the influx of wealthier new residents.