Marble Hall (1857) and Henderson Building (1859), 397-399 Front Street, Belleville: Marble Hall was the first building in Belleville to be built with a smooth marble facade. The original windows were most likely double-hung sash windows with larger glass panels. The extra-large glass shop fronts at the ground floor were made possible by the new glass production technology at that time. These windows appear to be almost the same size as those of the adjacent Henderson Building. . .The Henderson Building, however, was expressed in a lively Second Empire style. Thin vertical mullions separate the elongated casement windows, giving the building a French character. The centre portion of the building is slightly projected and capped by a convex roof with a dormer and a large-sized window. The roofs at either side of the centre portion are concave with dormers and circular windows. The hood mold lintels, as well as the supporting columns of the building, are made of cast iron.