Activists entered the building, most recently used by the Archdiocese of San Francisco as a music school, on Tuesday afternoon, the San Francisco Chronicle reported. They announced plans to use the building as a homeless shelter.
This was the second time Occupy targeted the building.
Police said the protesters allowed themselves to be escorted out of the building to police vans.
Elsewhere in San Francisco, Another Planet, the promoter managing the Civic Center Auditorium, was attempting to drive away homeless campers with noise. The noise, including traffic and construction sounds and an aircraft carrier alarm, was being broadcast nightly from 11 p.m. to 7 a.m. through the building's outdoor speakers.
The sounds, picked up from iTunes, have been "tremendously effective," Another Planet Vice President Mary Conde told the Chronicle. About 20 to 40 homeless people had been spending nights in front of the auditorium, and Conde said concert-goers had been complaining.
"I'm just at a point where I don't know what else to do," Conde said.