Siemensstadt Square is a 25-year sustainable smart urban development project in Berlin that requires transforming more than 70 hectares of brownfield area into a modern, carbon-neutral campus, including approximately 100 new, low-emission buildings and cutting-edge mobility concepts. The large-scale, long-term project involves numerous stakeholders that will evolve throughout the project progression, presenting communication, collaboration, and data management challenges. To address these issues, vrame Consult needed to establish a dynamic digital twin foundation capable of managing multi-sourced data in an integrated environment.vrame Consult selected Bentley’s iTwin technology to establish a digital blueprint of the campus, supported by a common data environment using ProjectWise and OpenCities Planner as a fully accessible portal for all relevant 3D BIM and GIS information. The integrated digital twin solution provides all project participants, stakeholders, and the public rapid access to trusted information that can be contextualized and repurposed. With open, interoperable technology and asset ontology, vrame Consult has established a scalable digital foundation to attain the 25-year vision of Siemensstadt Square.