The addition is a five-story 156,000-square-foot expansion to the existing facility, which included mainly open office areas, as well as a three-story atrium, and expansion to the existing cafeteria. The addition also created a new main entrance area for the facility. The existing loading dock roof structure was converted to the new atrium lobby. The pre-cast concrete facade mimicked the original design intent and was designed to be supported by the structure. The structure is steel-framed with composite floor beams and girders. The typical 32-foot by 32-foot bay sizes simplify the open-floor plan throughout the addition. The roof structure includes steel framing with roof deck. The massive 200,000 pound air-handling unit is visually screened at all sides of the addition. The foundations utilize a combination of small caisson and column footings bearing on rock. Since the completion of the addition, Barber & Hoffman has provided additional services for their expanded data center, installation of high density filing systems and various other structural assessments.