Well yes the original foundation could probably handle 3 tiers and 60,000 seats, however, as I said, the key is the arches, they keep the entire structure in place.
You can't put the foundations required for extra seating without taking the whole stadium apart (or certainly all of the roof). Given that the stadium was designed by a 'can-do' architect, I don't fancy the chances of finding a way around it.
No they won't. The offices on the second floor of the North Stand (i.e club coaches etc) will move to the Training Ground. The club offices are staying right where they are.
Let's quash this now. There is absolutely no more scope for increasing the seating at the stadium. The arches above the West and East Stand roofs essentially are holding the entire structure in place, and if you look carefully, the rods for holding them in place go under the roof in each...