Habitat Expansion
Concept · Stellaris 4.5.2
Habitat Expansion in the Stellaris encyclopedia: Unlocks Building: Habitat Central Control
Habitat Expansion in the game's words
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Unlocks Building: Habitat Central Control
Our early habitats were primitive things compared to the efficient designs we can now develop.
Source: common/game_concepts (concept_habitat_2) and localisation/english, Stellaris Cygnus v4.5.2 (9776).