Of the 5,000 people who visit the San Francisco Public Library every day, about 15 percent of them are homeless, PBS reported. After years of watching this underserved demographic float through to get Internet access, a restroom and often, just refuge from the cold, the library realized it was in an auspicious position to stage effective interventions.

So, in 2009, the library hired Leah Esguerra, who is believed to be the nation’s first psychiatric social worker to be employed full time at a library, SFGate reported. Since the program started, about 150 homeless people have received permanent housing, and another 800 have enrolled in social and mental health services, according to PBS. READ MORE: Library Offers Homeless People Mental Health Services, And It’s Working | HuffPo