The Lunder Building, a high-tech, flexible structure, commemorates the bicentennial of Massachusetts General Hospital and advances it into a third century of providing care. The 535,000-sf facility houses procedural programs, 150 inpatient beds, and new emergency and radiation oncology departments. Throughout the design process, the clinical planning reflected a commitment to performance-based design, which utilizes research to reduce falls and injury; minimize medical error and infection; improve staff productivity and communication; and enhance patient and family healing, comfort, and satisfaction.The programmatically-dense building, split into a procedural base and an upper bed tower, connects to five existing buildings via bridges and walkways.