Calling into question the current mode of designing for a single species, i.e., humans, sustainable architectural innovation resides in the paradigm shift from single-species to multi-species built environments. Focusing on the tree as both an example of multi-species successional systems and as a site of research-creation exploration, it is capable of supporting a multitude of species over the course of its lifecycle. In particular, the outer bark and sapwood hosts the hundreds of species necessary in supporting a healthy ecology. Notably in typical building practice, bark and sapwood is discarded from construction material, further displacing other species from the built environment.