Mayor Bill de Blasio Sunday opened Gracie Mansion to the public as part of his inauguration, welcoming into the mayoral residence thousands of ticket holders who braved long lines and frigid temperatures. The open house was billed by de Blasio's team as an event giving unprecedented access to the public -- the first of its kind in recent memory -- and the mayor greeted, one by one, everyday New Yorkers. "We felt with this whole inauguration that it is crucial to make clear government was open to the people," he said Sunday. "This is the people's house. Gracie Mansion is the people's house. City Hall is the people's house. We want people to know, in everything we do, they are welcome in."