Sheriff's deputies didn't have far to go to arrest Lee Wilson, 54, Tuesday for allegedly setting three fires over the weekend around the county administration building.
He was already in jail for public intoxication after being arrested Saturday.
Earlier Saturday deputies said they found trashcans on fire around the building, including one on the front steps and another on the San Lorenzo Park footbridge.
They said that Wilson, a transient, admitted setting them when he was questioned Tuesday, as he was about to be released on the drunk in public charge. One of the fires caused some flooding by triggering sprinklers at the building, but damage was minimal, deputies said.