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Recently, the Internet of Things and building information modeling (IoT-BIM) has captured attention because of its wide range of applications in multiple domains communicating across different layers. The IoT-BIM consists of three layers, namely physical, network, and application layer. This paper provides and discusses security attacks countermeasure for each IoT-BIM layer. In this paper, we discuss various state-of-the-art IoT-BIM security frameworks and propose a unified security framework for IoT-BIM networks, called “Unified Federated Security Framework”. The proposed framework relies on fuzzy cognitive maps for modeling and evaluating trust relationships between the involved entities in federated identity management systems.