We were appointed, alongside our partners at Publica, by Imperial College Healthcare NHS Trust to evidence the public value of the transformational St Mary’s Hospital and Paddington Life Sciences redevelopment. Drawing on a review of 127 documents, we built a robust baseline, aligned benefits to Westminster’s #2035 and Fairer Westminster priorities, and deployed our wider-determinants model to show how new clinical space, jobs, housing and public realm would improve local health.