Siemens has a long history of providing CAD tools and data platforms (like NX and Team Center). Although the predominant use case so far is factory design and virtual commissioning, most technologies can be applied and transferred to civil engineering issues as well. One concept for dealing with concurrency and versioning of digital twins is proper modularization. Entities are broken up at well-defined interfaces in order to minimize interdependencies. Some of the modules might not be accessible by all participants but hidden behind different levels of details. This is also reflected by the JT data model for long term storage, where Siemens has a strong influence on the specification and implementation of this standard. Beside topological information, modules might also provide functional capabilities like simulation models. Those can be defined as functional mockup interfaces (FMI) and provided together with the 3D model. Although the standard was defined predominantly for mechanical engineering, it can be adapted to civil engineering as well and Siemens is a key player in this community.