The WestendDuo was designed by KSP Engel und Zimmermann GmbH is the double high-rise building in a prime location in Frankfurt on Main close to the Alte Oper, in Germany. The WestendDuo is one of the smaller skyscrapers in Frankfurt. The two slender towers are self-confident, excitingly incorporating the different street grids. The open shape given the lobby ensures that it engages with its green surroundings. The towers’ slender elegance is emphasized precisely by the two-storey segmentation and is highly dynamic across two dimensions, whereby the gaze is directed from the facades towards the corners. In order to address future user needs flexibly, the edifice has been conceived for different possible tenants. Folded concrete ceilings generate pillar-free space and minimize heights, meaning that the 96m feature one more storey than is usually the case.