Modernizing this historic structure required complex infrastructure and design interventions. The first phase encompassed upgrading the existing ten-floor, self-supporting stack block. New cores and building systems were threaded through the stacks to provide climate control for materials storage; improve building circulation; and provide state-of-the-art work spaces for staff. The second phase focused on completing the restoration aspects of the project. The design strategy also created new "found" space within two large light wells at the center of the 320,000-square-foot building to create two sky-lit reading rooms, staff work areas, and new mechanical space. These infill spaces give Harvard critically needed expansion room in a building where, as a condition of the donor bequest, the building envelope could not be expanded.