The hulk of the crash-landed Stratospheric is used for the offices of Command, the workshops, labs, and classrooms of Engineering, and the cramped living spaces of Quarters, while Geoponics and the Garrison are structures built after landing. We never see an actual office for Expeditions; instead we interact with Expeditions staff (Tonin and Utopia) at the colony gate or while outside the colony. Standing in for an office is the colony gate (early on) or the Expeditions transit station (when Expeditions opens up) where you can check the Bestiary and descriptions of Expedition Locations.
After the main character's scenes during the game's Prologue Sequence, the game begins outside the Colony Quarters at the beginning of Quiet Season.
One of the game's Outdoor Locations.