St. Luke's Hospital in San Francisco, threatened with closure as a full-scale facility just a year ago, was reborn Thursday when its governing board approved a plan to rebuild the facility. The board unanimously voted to build a new hospital on the existing St. Luke's campus. The board also endorsed maintaining critical services at St. Luke's, including an emergency department, obstetrics and gynecology, an intensive care unit and urgent care, as well creating a new "center of excellence on senior health."