While wandering Honolulu between LOST locations I snapped various photos of buildings I found appealing. One of these shots turned out to be the Waikiki Landmark which doubled as the building housing Anthony Cooper's condo in season 3's The Man from Tallahassee.
It seems that the interior scenes were actually filmed within one of the condos rather than on a soundstage. I believe the glimpseout the window is a genuine view of Honolulu rather than CGI.
It took two-and-a-half seasons but we finally found out how Locke became paralyzed! A shocking moment very well executed.
The same instant is revisited in the season 5 finale -- it is revealed that Jacob was present on that day and it is highly implied that Locke would have died if not for Jacob's intervention.