Welcome to the big time. In front of his Brooklyn rowhouse, Bill de Blasio was officially sworn in as New York City’s 109th mayor just after midnight on New Year’s Eve. “To everyone, this is the beginning of a road we will travel together,” de Blasio said. He is the first Democrat to be elected in two decades ruled by both Republicans and Independents. State Attorney General Eric Schneiderman administered the oath as de Blasio’s wife and two children stood next to the incoming mayor.