The tenant application was built in parallel to the refurbishment of the Valilla office – one of the offices to be covered by the services in the application. Consequently, many components of the building were not accessible to test integrations needed for the tenant application. To solve this, the project team relied on ProptechOS digital twins of the building and components, such as sensors, locks, and administrative systems, to coordinate the assembly of software applications and hardware in the plan. The project was divided into separate parts following the RealEstateCore standard, which enabled interoperability across vendor systems and real estate in the project. Hence, when the components of the project were put together, they all fit well.