Looks like the structure will be primarily concrete construction. Also gives a good visualization as to why digging and pouring the footings is taking so long - they account for almost 1/5 of the height of the total structure.
@Daveography , the structural renderings are impressive! It really shows how deep they're going and how huge these footings are in relation to the tower's height. Thanks for that! @DarrenK , thanks for the pictures! I'm really excited to see this project emerging. Once complete, it'll be a game changer for Edmonton and the downtown area.