Citadel Station gets the game text of each face-up Location card beneath it.
Whenever X damage counters are put on Citadel Station, put half of X damage counters (rounded down) on a Location card beneath it and discard that card when it has damage counters on it equal to or greater than its printed build cost.
Pay X build points Put a Location card with printed build cost X from your hand face-up beneath Citadel Station. (That card isn't in its stack.) Only one copy of each Location card can be beneath it. Play only during your build step.