When starting a renovation project, there is much to understand about the existing building. One "unknown" is the structure: what is the original structure? What condition is it in? Can it support the modifications this renovation needs? How much work (cost) will that be? In this presentation, we will discuss early information to look for and the structural code triggers to be aware of. We review existing structural materials and what opportunities or corner each present. We will also discuss in situ testing and when that can be an option.