"Keep Seattle Livable", by apparently opposing higher building zoning laws so that only short single family homes can be built. They have it in their head somehow that the current housing stock is affordable, despite the fact that a small 3br single family here sells for like a million, and rent is like >$2k/month.
Keep Seattle Livable for people who already own their homes in the area, so other people can't move in.
Affordable housing advocates would be happy to see low density mansions upzoned into relatively cheaper multi family housing but those are never the proposals we see. Instead again and again we see proposals to tear down affordable multi family apartments for working class people in order to build larger, more expensive multi family apartments for the middle class. I am unsurprised to see housing activists opposed to these sort of upzonings even if they would result in a net increase of housing.
[0] http://faculty.chicagobooth.edu/chang-tai.hsieh/research/gro...
[1] http://www.lao.ca.gov/reports/2015/finance/housing-costs/hou...