BDTA's mission is to Develop an Open & Trustworthy Techno-economic Ecosystem to advance towards full implementation of Building Digital Twin Environments across all the stakeholders and lifecycles of AECOO (Architecture, Engineering, Construction, Owner & Operator) Smart and Connected Real State and Infrastructure Assets, including occupants, through professional development and community. Located in Antwerp (Belgium), the BDTA was founded under the umbrella of the Horizon 2020 project SPHERE, funded by the European Union’s H2020 programme under Grant Agreement No. 820805). The BDTA envisions the coordination of a multicriteria efficient decision-taking across all AECOO stakeholders by digitally duplicating building stock to support the Green Deal Transition in EU and the rest of the world.