Well object’s (or as you said building’s) do sometime’s get reused in games. Mass Effect is a brilliant example alot of the game is done traveling in building’s that has been reused.
Well it’s to lower disk space needed to play and so it’s easier to load. New stuff takes alot of data to get it to work.
The location where Lone Wolf took place is close to where N6 met the PoA, just down the cliff in the distance. You can see N6 looking at a nearby battle just after the Autumn escapes.
BXR manufactured a lot of materials including landing mechanisim’s for the USNC ships for docking. It was a shipyard remember! Also, when Lone Wolf mission begins, you turn around and if you look up a little in the distance, you can see the cliff and structures where Noble 6 was standing and looking down on when the POA flew away.