The building was originally designed to accommodate the curvature of a rail track into the building and resulted in a complicated fabric of existing spaces with an irregular column grid. Core elements and circulation are anchored in the center of the building, allowing irregularities along the perimeter walls. The design uses simple and clean masses to clearly distinguish modern interventions from the existing historic fabric. A new monumental skylight is introduced above the visually dramatic new circulating stair to bring natural light into the core of the building and interior glazing is used along the main corridors to allow the natural light to filter into the individual departments. The renovated space is celebrated by its occupants for the quality of light and clarity of circulation and how both help to create collaborative and productive working environments.