Extending upward to bridge the gap between South Boston and Backbay, this timber form offers a new solution to the city’s pursuit of sustainability. Extending outward, in response to the adjacent network of interstates and railroads, the building further bolsters connections for traversing about the city. Three programmatic elements drive a form which anchors the building to the urban fabric at every scale. Micro-housing units, collaborative spaces, and a market orchestrate opportunity for the community to flourish. Fourth and Foundry is a prototype for the future of sustainable timber cities.