@snakelinksonic: I think I understand. I am on the same data center but a different server. Am I still able to join the FC through a contact if I can't go to the housing district and apply?
Your only real options are to either server transfer or create an alt character if you want to play directly with us. Like @snakelinksonic said there is cross server play for doing duties and joining pre-formed parties but if you wanted to directly chat with people in the free company chat channel as well as hang out around the house the only way to do that is to be physically on the Ultros server with us.
That being said if you play FFXIV and just want some like minded people to bounce ideas off of outside of the game either me or Snakelinksonic can hook you up with a discord link if you would like to join that.