A new research facility for the study of rare diseases in children is now part of London’s Great Ormond Street Hospital (GOSH). One of the world’s leading pediatric facilities, it opened in 1852 in a townhouse and expanded rapidly, thanks to philanthropy—J.M. Barrie gave his copyright for Peter Pan to the institution in 1929. Now the hospital depends on the National Health Service for the bulk of its operational budget, but thrives because of private and charitable donations. Today, GOSH is an intensely urban low-rise complex, packed into Bloomsbury’s Georgian district, which provides 339 beds in 14 different buildings. In the late 1990s, the hospital managers considered moving from central London but rejected this idea for an ambitious new development that improves and expands the existing facilities. By doing so, the hospital retained the famous address, remained part of an ecosystem of other institutions, and attracted top staff who want to work in central London.