In
Tales of the Legion of Super-Heroes #320 DC provided the following diagram of the Legion's head-quarters as it existed circa 2984. As far as I know it was not destroyed for another five plus years, so this should be "current" for the rest of the Baxter series, atleast.
The artists on that issue were Dan Jurgens and Karl Kesel. However, when the same diagram was re-printed in
Who's Who: The Definitive Directory of the DC Universe (vol 13), the art was credited to Keith Giffen and Larry Mahlstedt.
My favorite part of this is the note on the right saying that no Legionnaire wanted to have living quarters near
Brainiac 5's laboratory. Too funny!
Click on the picture to
Colossal Boy it.