Starting in 2015, a group of forward-thinking regional leaders began to develop a plan for a proactive regional design challenge modeled after Rebuild’s Hurricane Sandy Competition. The resilience plans developed in San Francisco, Oakland and Berkeley as part of the Rockefeller Foundation’s 100 Resilient Cities effort identified a need for greater regional collaboration to address climate adaptation – despite the looming threat of climate change, there was no comprehensive regional plan to deal with the sea level in the Bay Area. The unique hydrology of the Bay warranted the type of collaboration the design challenge could facilitate, as shoreline protections in one area of the Bay could increase sea levels or wave action in another. Collaboration on this scale could help illuminate the need for each county to consider the impacts of their decisions on the other communities that share the shoreline. With hundreds of jurisdictions and countless communities sharing the shoreline, there was ample need to catalyze and inspire collaboration.