The integration of Internet of Things (IoT) systems and Building Information Modelling (BIM) has the potential to transform the construction industry by enabling the creation of intelligent buildings that can optimize performance and adapt to changing conditions. However, with an increasing number of devices and systems being developed and deployed, there is a growing need for a standardized approach to ensure interoperability. Ontologies play a critical role in achieving interoperability, providing structured and standardized ways of representing and sharing data. Most IoT applications today incorporate intelligence at the edge and are capable of making decisions by federating knowledge gained from multiple sources. However, current ontologies often fail to capture such complex knowledge. This paper highlights the importance of developing an ontology that can annotate the complex knowledge generated from the intersection of building, sensors, machine learning, and communication domains. Specifically, this work considers reusing existing ontologies in mentioned domains instead of proposing yet another ontology. As part of this work, we integrate BOTSH and BOSH ontologies and align them with MLSchema and ToCo ontologies. The paper also demonstrates the potential of integrating knowledge present across these ontologies in creating innovative applications spanning multiple domains. The consistency and correctness of the proposed ontology are evaluated by applying it to a real-world project, yielding notable results.