Quetzal Palace in multiple cities

If I want a Quetzal Palace in a city other than my first (so I can treat a different city as my "capital"), will it still cost amber stones, because they're associated with the palace itself; or will it be the level cost minus amber stones, because they're associated only with the number of cities?

That's unfortunate, one would think the amber stones ought to be associated with the size of the empire rather than just levels of the palace. Another possible way to do that would be to have possible cities be based on the sum of QP levels rather than just its highest. I think I'll take that to Suggestions.