the external form of the building is dictated by the grid of . this is expressed externally as a truncated triangular pilaster, which runs in an unbroken line from an expressed balcony form at the level of the 2nd floor to the facade setback at the level of the 12th (or roof) floor. these pilasters continue in an abbreviated form against the face of the 12th floor setback, the overall effect being one of a major vertical emphasis and one of symmetry.