The Architecture of Additions considers the ways in which old and new architecture combine and work together—the central issue in the design of architectural additions. Paul Spencer Byard, an architect and lawyer, looks at more than sixty combinations, built and unbuilt, for criteria to help protect the public interest in great buildings. Drawing on examples from Grand Central Terminal to St. Peter’s Church in Rome, from the Louvre Pyramid to the Salk Institute, this book will help architects work with significant old buildings and help interested private and public persons arrive at judgments about architectural successes and failures that are rational, satisfying, and enforceable. The issues discussed here affect everyone who has a stake in livable cities.