The latest advanced technologies in wind engineering, structural engineering, structural systems, construction materials and methods were applied in order to build the tower. The materials were subjected to wind tunnel tests at hurricane speed (200 km/h) to make sure they would withstand all conditions. Flexible tubes and joints were used to enable some sway. The two most important challenges to achieve this project within the required target were the logistic organization of the vertical transport (materials, workers and waste evacuation) to achieve a construction cycle up to two floors per week and the pumping up of the concrete to the highest level possible (a world record of 585 m). In order to cope with the problem of placing concrete in high temperature conditions (up to more than 45°C), special concrete mixtures were developed and poured mainly during the night.