Nuria Lee emigrated from Spain five years ago. She teaches art at Bolinas School, but last fall she knew her family of four could not take another winter in their 600-square-foot Bolinas home. Despite a mold infestation, the landlord had hiked up the rent by 18 percent.
“It was becoming clear that we had to leave the district, and I just thought, I have to do something—right now,” she recalled.
Ms. Lee and another staffer…