“Wood City” applies mass timber engineering to the 19 building categories that essentially shape our built environments, otherwise financialized as real estate products by Wall Street. Suburban offices, fast-food restaurants, metal warehouses, big-box grocers, garden apartments, single-family houses, hotels, self-storage facilities, assisted living facilities, strip-shopping centers, etc. constitute 75% of the built environment. Given that the US will double its built environment in just one generation coupled with the urgency to develop low-carbon futures, what if cities were built from the only construction system sequestering carbon and engineered to be “energy positive” – wood? Real estate value chains are undergoing transformations in sectors like fuel retail, fast food, grocery, and logistics, while new interest from venture-capital is hybridizing housing, hospitality, healthcare, and the senior services markets. Innovations in timber-engineered buildings to date have been associated with signature projects involving tall buildings and cultural institutions. Alternatively, Wood City outlines a design research agenda for mass timber through the pattern languages of ordinary building sectors already undergoing novel mixings of space, services, technologies, and experiences.