Here’s an interesting LinkedIn update from the structural superintendent. Includes some good pics:
https://www.linkedin.com/feed/update...36809420304384
The gist of his post is that they’ve reached the stage where they no longer need to use the forms constructed from steel I beams, as the floor plates are now wide enough to accommodate all the legs of a standard table form.
EDIT: You can see this clearly in the pics mcminsen posted right after me. Presumably the outside perimeter of the forms — which they’ll reuse for the remainder of the building — now predicts the final dimensions of the top (ie. rectangular) floors.
Pic by mcminsen, Feb 19 (see next post in thread).