[jimbob]

Without some way to only allow one palace per empire though, it would be tough. It's have to be a gentelman's agreement not to build any more.

I guess you could give everyone one of these at the start of the game, and then make the facility really expensive to build... I'm talking astronomically expensive. Then people wouldn't build extras, atleast not until well into the later phases of the game. By then, who knows, maybe they've discovered decentralized government