University officials said 23 protesters who had occupied the building were arrested on suspicion of trespassing, a misdemeanor," reports SF Chron. "Ten other demonstrators outside the building were arrested on suspicion of unlawful assembly and resisting arrest, also misdemeanors."
Here's raw video of police entering the building a little after 3 a.m..
Although the students planned to occupy the building for three days, they managed to stay for almost 24 hours. Students are upset because, after budget cuts of more than half a billion dollars, "CSU trustees approved a 20 percent fee hike in July, bringing annual tuition to $4,827."