If Oakland city leaders were more proactive, they might use their 90 day rent hike / eviction moratorium[1] to recruit modular builders and create zoning exceptions for this type of housing. $600/month would be a lifesaver as median rent in Oakland hits $2950 for a two-bedroom. (It would also probably be a cheaper way for SF to house the homeless than acquiring or building new SROs.)

[1] http://sf.curbed.com/2016/4/5/11365144/oakland-rent-eviction...