It refers to a rectangle that's approximately contstructed in the ratio of 9 to 16. The golden rectangle has several characteristics. Let's say I create a square within this shape. Then, this smaller rectangle that I just created will also be a
golden rectangle. I make another square within that and the leftover is another golden rectangle. And I make a few more, and when I connect all the central points of these shapes it creates a spiral that continues forever. This is the "Golden Spin".
Considering factories themselves are unlimited and can stack, I see no reason why the industrialist embassy wouldn't stack as well.