If reports are to be believed, and the 125 is what Charlotte puts forth and JR matches it (hopefully) we are talking about a 250 mill upgrade.
Chicago did a big upgrade a few years back and they played at the University of Illinois' Memorial Stadium for an entire year.
Where do the Panthers play while these huge upgrades unfold?
You cannot do 125 to 250 mill in upgrades between a January start date and September of the same year.
Green Bay has done and is doing it right now. They are adding an upper deck in one end of the stadium as we speak. You could see the under construction area during the playoff games.