The building is topped with a sign reading "ARKELL," which is reminiscent of the high-profile "BEECHNUT," sign, both of which are visible from the adjacent New York State Thruway.
The building is clad with white glazed brick and field limestone, which matches the original slate-clad mansard roof of the existing library. The structural system includes structural steel beams and columns; plywood-sheathed, cold-formed metal stud shear walls; a composite concrete slab and steel beam floor system; and cast-in-place concrete basement walls.
Another striking feature of the addition is the one-story Memorial Walk along the north side of the existing building. This steel-framed, glass-clad addition provides views of the restored Memorial Garden and direct access to the Night Watch Gallery, which houses the historic "Night Watch" oil painting.