Since we are the owners of the settlements and these settlements have ''mayors'' shouldn't there be a Player HQ with a Mayors office, with the mayor spending his time there like Diamond City.
Addition:
Have decorations based on the mayor
Have ''empty'' decorations in places where you can add junk that the player has found to make the HQ their own
Addition:
Have decorations based on the mayor
Have ''empty'' decorations in places where you can add junk that the player has found to make the HQ their own