Ask ten industry observers to define the Building Internet of Things (IoT), and you will probably wind up with ten different answers. It’s not hard to understand why. The past few years have seen an explosion of new options in information technology and facility automation. Many of them come from start-up companies. The bulk of these products are more than just beta tests, but haven’t reached mainstream adoption yet. The Building IoT is distorting old product categories while also creating new ones. It’s introducing unfamiliar language and raising new questions. And while the term is not just hype, there certainly is some hype involved. In short, the Building IoT market is diverse, complicated, and changing.