I too, have to agree with the Mayor. Paris, like London, is full of Architectural treasures that represent the culture of the city and its past citizens. Cities like these need to be allowed to grow of course, but we also need to retain a certain amount of the past and if it is done properly, will blend harmoniously with the modern. Countries have these laws or guidelines to protect themselves from conglomerates or people with vast amounts of wealth and taste, who assume they can create or change anything at a price. I suspect the changes will probably be prohibited, especially as it is to a building that illustrates clearly the style of such a revered king as Louis Xiii was.