Crystal Towers mark the official center of King Abdullah Financial District. The two towers, rising up 18 and 26 stories, comprise world-class office facilities and meet the most ambitious standards within sustainable building. The raised base of the towers ensures free access between the Financial Plaza and the green loop, the "wadi", which runs through the entire district. In combination with the numerous skywalks of the financial center, the covered passage under the towers represents a new approach to infrastructure in this part of the world, allowing pedestrians to walk outdoors in a pleasant, temperate climate.