In Season 5, Amos returns to Earth to wrap up some affairs; he then visits an old friend / crime lord at his headquarters. The sequences are shot on the grounds of Fort York, in Toronto, although futuristic elements have been grafted on:
I've matched a couple of the shots (as well as I could). It's kind of fun to see the movie magic: not just filters applied, but areas knocked out or enhanced with digital effects. In the image above, the entrance, they've added a wall, construction work in the background, and removed the overhangs and highway. Below, they've added a ginormous building on the left, and removed the condos south of the Gardiner Expressway. They also added a train running along the highway's underside.