Decarbonization has moved from a future consideration to a present one. For building owners and managers, the question is no longer whether buildings need to change — it's how to approach that change in a way that makes sense for your asset, your tenants, and your long-term operating strategy. This article breaks down what building decarbonization actually involves, why capital upgrade decisions made today carry more weight than they used to, and how a phased approach can make the transition manageable.