Space Station: Lots of them, as residence, lab, factory, outpost, city, farm, cageworks, starport, skymall, border station, and just about everything else you can think of by way of uses. After all, in the modern day, three out of every five Imperial residents lives in space, not planetside.
The gamut runs from the venerable Oculus Station, a by-modern-standards tiny Skylab/ISS style tin-can habitat – large by the launching standards of early space programs, but then, they were using Orion launchers – preserved as a museum, to the Conclave Drift, which at 36 miles long, eight in diameter, and nearly 10 billion tons gross mass is not the largest ever constructed any more, but by population, diversity and reputation (as the seat of the closest approximation to galactic government and an awful lot of its business) is the unchallenged queen of the orbital habitat community.