> I don't see a builder voluntarily building low-cost housing in the Mission district, just more luxury condos. A municipal ordinance that removes restrictions while imposing a requirement to build affordable housing along with more luxury condos might be the right solution.

Yeah, that is pretty much the only solution.

The other real option is going the NYC route of subsidized housing. However, I'm not sure SF really has the revenues for this to be viable tho.

http://www1.nyc.gov/site/nycha/eligibility/eligibility.page