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LEED (Leadership in Energy and Environmental Design) is the world’s most widely used rating system for sustainable buildings. It comprises four levels in ascending order: Certified, Silver, Gold, and Platinum. LEED certification assures tenants that they are using a sustainable property with added ecological value and thus are contributing to sustainability. With energy efficiency becoming increasingly important LEED certification increases the opportunity for investors to increase value.

THE SOURCE offers outstanding sustainability primarily due to revitalization of an existing building. Preserving the “gray matter” of the existing high-rise tower will have an extremely positive effect on the CO 2 balance. The concept of smart home technology, efficient energy utilization and new energy generation means that resources are spared, moreover, on a state-of-the-art level. A comprehensive mobility concept completes the holistic approach. THE SOURCE has therefore already received platinum precertification.



A global building certification standard was introduced in 2014 that focuses on people’s health and well-being - the WELL Building Standard.

With the occupants and users of a building in mind, well-being is analyzed, measured, and scored across ten categories: air, water, nourishment, light, movement, thermal comfort, sound, materials, mind and community. There are four levels to WELL certification: Bronze, Silver, Gold, Platinum. Due to its outstanding results, THE SOURCE has already received Platinum precertification.



    WiredScore is a globally recognized certification system for the digital connectivity of real estate. It not only certifies digital connectivity and smart technologies in office buildings, but also evaluates the overall digital infrastructure of these properties. Criteria such as the provision of high-speed fiber optic connections, redundancies in the building, the quality of the telecommunications rooms, the quality of riser points/ducts, mobile network coverage, and the adaptability of the individual technical components to future technologies are evaluated.