In 1995, Boston challenged the National Trust for Historic Preservation to expand its National Main Street model.  The result was Boston Main Streets, the first urban, multi-district Main Street program in the United States.  Boston Main Streets now brings the technical knowledge of business district revitalization to twenty Boston business districts, including six in Dorchester (Bowdoin Geneva, Fields Corner, Four Corners, Greater Ashmont, Grove Hall, and Uphams Corner).