The concept of Urban Sequoia (Figure 1) combines optimized structural design with low embodied carbon materials, efficient construction, and carbon-capturing technologies. These carbon-capturing approaches allow buildings to start their service life with an ultra-low embodied carbon and sequester additional carbon over time, becoming net carbon negative. The structural approach to Urban Sequoia incorporates nature-based, living materials that embody far less carbon than conventional structural solutions while absorbing additional carbon over time. When combined with non-structural systems such as exterior wall systems that incorporate biomass and algae and technologies including Direct Air Capture (DAC), tall buildings could absorb three to five times the amount of carbon emitted at the time of construction.