The existing foundation walls at Nassau Street and Pine Street have been shored both horizontally and vertically with heavy timber. The existing caissons are clearly visible. While the capacity of the original caissons may have been sufficient to support the new structure, which is only two stories taller than Hanover National Bank Building, several factors may have militated against reusing them: lack of original structural documents, changes in the minimum loads the building was required to support (either by law or by virtue of the owner's desire), changes in the allowable loads on steel members, or the need for additional sub-grade space.