BAH! it would seem something ate most of the rest of my post, mnot sure why only the Breakers posted there... But you are VERY correct Tony. I and a friend of mind surf several "Mega Mansions" blogs purely for the joy of seeing just how tacky and tastless the newest McMansion is. Floor plans are often a mess, with huge empty wasted room, rooms that make no sense or serve no function, and of course, the ever popular closests that are bigger then a whole bedroom.
Part of why I started collecting floorplans to historical houses was just to see the huge contrest between then and now in terms of the flow and space use.
As for the Mansion, here is the one that got cut off.
Vanderbilt Mansion 1st Floor
Vanderbilt Mansion 2nd Floor
Vanderbilt Mansion 3rd Floor