Report: Concord’s gasholder is in imminent danger of collapse but no easy quick fix is available This map from ADG Solutions shows a long-term possibility for the city’s southern corridor, using the preserved gasholder building as a monument to give personality to the area. ADG—Courtesy The iconic gasholder building on South Main Street in Concord is seen on Monday, Jan. 29, 2018. The structure has been added to the National Register of Historic Places. (ELIZABETH FRANTZ / Monitor staff) Elizabeth Frantz One of the entrance areas with signifigant roof damage to the structure of the Gasholder building on South Main Street. GEOFF FORESTER