system consists of the girders on each story, which are welded to the building's columns via gusset plates. The building also contains "X"-shaped diagonal bracing, placed within the partitions next to each of the elevator shafts. Between the individual elevator shafts is a system of knee bracing; it consists of diagonal steel bars shaped like a rotated "K", which extend downward from the centers of the horizontal girders. The structural steel frame carried a dead load of . Originally, the spaces between the girders were spanned by flat arches made of hollow bricks, which were then covered with a layer of cement. Fireproof timber sleepers were then installed atop these flat arches, and a layer of fireproof wood was installed above these sleepers. The finished wooden floor was then installed above the layer of fireproof wood. The partition walls were constructed of square bricks, which were then finished in plaster. The building's elevator shafts were surrounded by walls made of fire-clay, which were then covered with a layer of tiled brick. The superstructure used of iron, brick, mortar, terracotta, limestone, masonry, and other materials. Interior Initially, the entrance on Broadway led to an elevator lobby with decorative pilasters, while the entrance on Seventh Avenue led to an ornamental staircase. The lobby contained a ceiling measuring high. The lowest part of the wall contained a marble wainscoting that measured high, while the upper portion of the wall was painted white. The top of the main hall contained a paneled cornice decorated with a shell motif. The floor was made of white mosaic. There were seven oak-framed revolving doors in the building: two at the Broadway entrance to the lobby, one at the 42nd Street entrance, and four leading to the subway station in the basement. On the first basement level was a pedestrian arcade with several small stores, which ran from street level to the Times Square station's southbound platform. The arcade was closed in 1967 due to high crime, but an archway leading from the station to One Times Square's basement remained visible until the 2000s. The rest of the first basement contained storefronts and the Times's mailing department, while the second basement contained the mailing and repair departments. The third basement is larger than the other basement levels, extending underneath the sidewalk to the curb line on all sides. It covers an area of , three times as large