As City Hall undergoes a historic transition of power, some of Mayor Thomas M. Menino’s top Cabinet members are heading for the exit before the new administration takes charge.
One-quarter of Menino’s 20-member Cabinet has left or has announced plans to resign. More are mulling options. The departure list includes Menino’s chief of labor, John Dunlap, whose last day was Friday after eight years in the administration. He will hold a post with similar duties at the Massachusetts Institute of Technology, he said.