Formwork has also been constructed along the west lot line. Here the existing east wall of the adjacent structures is being used as part of the form. The three holes in the party wall of the adjacent building have been made to permit the insertion of needles, heavy steel beams used to temporarily support masonry. One of the large needles is visible in the lower portion of the photograph. Needling was probably required at this portion of the wall because the foundations of Wall Street wing of the Astor Building do not extend as far below grade as those on the American Surety Building on Pine Street.