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The Building Topology Ontology (BOT) was in early 2017 suggested to the W3C community group for Linked Building Data as a simple ontology covering the core concepts of a building. Since it was first announced it has been extended to cover a building site, elements hosted by other elements, zones as a super-class of spaces, storeys, buildings and sites, interfaces between adjacent zones/elements, a transitive property to infer implicit relationships between building zone siblings among other refinements. In this paper, we describe in detail the changes and the