John Gallagher has an article in the Freep, this morning, giving a bit more detail into Gilbert's intentions, and they are major. There is no height limit, and they say this could be something that rivals the RenCen in height, or something more low-slung. And, while Gilbert doesn't want to copy the old Hudson's store - and quite frankly, god love it, it was no architectural masterpiece - he does want to recreate the feeling of the street wall the store did.
file photo
So, apparently, that answers the mystery of how much this site can physically support. They are treating this as a total blank canvas. And, knowing Gilbert, he wants something epic. Now, we'll have to wait and see how the economy is when this goes up and how many other folks buy into it.
BTW, looking at that picture above, it's going to be crazy seeing the streetcar back out in front. lol