Twilight's Fall – a separate game. Twilight Imperium's expansions, mods and rules topics are not part of it.

Mowshir Freeport

Outside of combat, players may trade their units in the space area of this and adjacent systems as part of a transaction. A player who gained units this way then replaces them and moves them to a system that contains their ships and 1 of their command tokens, if able; otherwise, remove those units.
The Emirates of HacanUnit – Structure – Monument

Monument

Outside of combat, players may trade their units in the space area of this and adjacent systems as part of a transaction. A player who gained units this way then replaces them and moves them to a system that contains their ships and 1 of their command tokens, if able; otherwise, remove those units.

Placement
IndustrialCultural

Source: Monuments