The jury awards a Citation of Technical Achievement to the United Nations Headquarters Campus Renovation of Facades. This world-renown complex by a team of mid-20th century master architects, and in particular the iconic Secretariat building, had failing wall assemblies that were beyond repair and necessitated replacement. This undertaking utilized state-of-the-art design methodologies and rigorous analysis of the original glass and other facade materials, to achieve a historically appropriate visual outcome while meeting today's energy conservation and security objectives. The project represents a significant addition to the body of knowledge essential for the preservation of early modern glass and curtain wall buildings.