The project aim is to develop and verify the practical functionality of advanced tools for predicting and aggregating the flexibility of building facilities available in the commercial building sector by 6/2027. These tools are intended to open up a new demand-side response (DSR) segment in the flexibility market and thereby increase capacities for stabilizing the electrical transmission system. The new flexible services are intended to offer an alternative to and supplement existing providers using mainly industrial production facilities. Achievement of the objectives will be demonstrated through pilot testing of coordinated management of up to 5 com. buildings in collaboration with their building management entities, billing entities, aggregator and TSO covering the entire supply chain.