Upper and Lower Seattle is a book in Deus Ex: Invisible War. It describes the construction of Upper Seattle atop Lower Seattle. A copy of this book can be found in Upper Seattle's Pequod's as well as the Seattle Tarsus Academy.
Seattle rose from the ashes of the Collapse by building onward and upward. Pillars were erected in the center of the old city, representing the city's firm resolve to continue and to raise itself up. Upper Seattle was constructed on a platform laid on these pillars, with Lower Seattle nestled safely beneath, and an Inclinator connecting the two levels.