Suffolk University has reached an agreement with residents in the Beacon Hill neighborhood of Boston that will enable the school to move forward with its ambitious expansion plan. The agreement essentially prevents the college from enlarging its Beacon Hill footprint, a long-standing fear among residents. The college has promised to freeze its enrollment at 5,000 full-time undergraduates for the next decade to limit its need for further growth. In exchange, the neighborhood's civic association has agreed to support Suffolk's plan to build a 10-story academic building and not to contest the university's 10-year expansion plan, which is under city review.