So the slave auction is supposedly taking place inside the IFC2 skyscraper. And yet, weirdly, when a hole is blown in the side of the building so that they can all make their escape via parachutes (sounds familiar?) the background clearly shows that they are in a completely different area with the IFC2 building visible in the distance (see last image).
So here is Reiji meant to be looking out from somewhere near the top of the IFC2 getting ready to jump. However, you can see the IFC2 in the background. Actually, the shots used for this special effect can only really have been achieved via drone or helicopter because there are no buildings here that give this same height/elevation view.