The Allianz Tower, Milan, part of the CityLife complex, is notable for its slenderness and the eye-catching presence of four diagonal struts that stabilize it at the base (see Figure 1). It was a finalist for the 2016 CTBUH Best Tall Building Europe award, largely on account of its unusual structural system. This paper examines the design, testing and implementation of the primary steel and concrete structural systems in the building.