I rechecked with my Angel season 5 DVD set and from what I can tell they are using the Wolfram and Hart set. It's redressed, yes, but the layout is nearly identical. The stairs and the upper-level walkways were my first clues to this. They match the office in Angel exactly. A lot of the offices seem to follow the layout in Angel as well, although I think in Eli Stone they removed a few walls to put in more offices (upper level) or to turn several offices into one big one (lower level).
Edited on 02/11/2008 1:03pm