It’s often said that when one door closes, another door opens. In the case of UC Santa Barbara, when one dorm building comes down, four more take its place. The university wants to replace the two-story, 412-bed Santa Rosa Hall with a new four-building complex that would accommodate 1,688 beds as part of the East Campus Housing Project. The UC Board of Regents approved designs and a $566 million budget for the project last December. That budge…