An international call for ideas that identify new urban possibilities for downtown San Francisco’s Market Street, responding to the disruptions caused by the pandemic, remote work, and other cultural changes. This is a time to think differently, to escape the traps embedded in techniques and assumptions of the past, and venture into the speculative possibilities of an urbanism not yet discovered. Using San Francisco’s Market Street as a subject, we ask competitors “How might a new set of ideas be developed to address the challenges in post-pandemic city cores enabling them to flourish in ways that are economically viable and experientially uplifting?”