I just purchased the game and I am having a blast learning it. Can't wait till I really know what I am doing. My question is that when you are in your planet window and deciding what you want to build, if you select a square that currently has a building when you build a new one is it just another building in that tile or does it replace the building you had before. I couldn't find anything in the manual about it so that is why I am on here.

Thanks for any replies!