The owners of the famed Beehive restaurant in the South End and Beat Brasserie in Harvard Square are pushing a new concept in Boston's Downtown Crossing neighborhood. The new venture, which does not currently have a name, is being fashioned a "food, beverage, and social concept" on the ground floor of the Lafayette City Center building on the corner of Washington Street and Avenue de Lafayette. The Beehive and Beat Brasserie are both known for their food and live music. The 63,000-square-foot...