So, based on the map that I put in here yesterday (now with added orange area showing what you have said above), do you think that this orange area is where they would look to be building Monstropolis?
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If so, that looks as though it would divide any remaining potential expansion space in half (obviously I would imagine that they would need to keep/relocate some of the buildings currently backstage.
Is there anything in the yellow area that you know that they would not remove? If not, then it looks like there could potentially be enough space for Zootropolis, and/or Springfield, and/or Metroville to be built, depending on what they were planning for the land, especially if they included RnRC at some point in the future.