The Innovationen (completed in 2018) and Helix (still under construction) Towers, respectively 125 and 110 meters tall, rise up like a “gate” north of the city centre. The iconic nature of this element is due to its location in a fabric of low constructions and an anything but uniform and flat treatment, reserved only for forms of vertical densification. The primarily residential programme is integrated at the lower levels by recreational and commercial services; the main challenge was to reconcile the variety of flats with a limited number of prefabricated elements and the renewal of the aesthetic of the apartment tower. The buildings resemble stacks of cubes, whose vertical and horizontal segmentations of projections, niches and terraces gives the envelope an unusual 3D movement and a futuristic appearance amplified by oversized windows.