Retrospective BIM models were developed as part of the redevelopment of a major convention centre, using scan-to-BIM workflows to capture existing conditions with accuracy. Laser scan and point cloud data were used to create an LOD 300 BIM model of the primary and secondary structural elements, while a detailed LOD 400 Tekla model was produced for the steelwork. Our work provided a reliable digital foundation to support redevelopment planning and design.