I've been playing around with a lot of looks for this one, but finally settled on something I'm happy with.
The administration deck is where your citizens will live and work. It contains updated versions of the apartments, as well as the Ministry of Thought and Ministry of Freedom offices. It starts as a single small block, and can be expanded to a cavernous city encased in a concrete shell.
A central promenade between the two wings will give your people the open space they need to stay sane, as well as another much-needed reminder that you are always watching.
The other decks (as well as Nova and Khanna's storylines, and a more coherent overarching trajectory for your empire) are well underway, but this is the first one that I'm happy enough with to share some screenshots. No ETA yet (because my brain rejects those), but progress has been steady.