
So this will not be an easy task, first, a huge exploded-looking pit from surface to bedrock must be made, then the structure will be built from bedrock-up, all the way to the height limit. This is going to require CRAPLOADS of stone, as you can see.
Also, this is why it won't be to scale(The world's tallest building is to the right of the Citadel):

So if anyone wants to help build this, it will GREATLY be appreciated. The interior may look similar-ish to Half-Life 2's Citadel(but safer), so not much stone will be used for the inside(empty space in a lot of places and all). Also the size that I want this at is subject to change.