I have no idea, but I imagine it would be in the high millions. The architect alone would probably run a couple hundred thousand. You might have a better idea than I would. What impresses me about this era, is that most of these people were amateurs, for lack of a better word. Joseph Paxton did not go to school and get a degree in architecture. He built very elaborate green houses for rich people. And they accepted his proposal. That would never happen today.