Back in 1999 I made a map for HL1 for a group I was in called NetBastards. Since the release of the HL2 SDK I've reworked it to fit into the HL2 world.

There are three distinct levels in the map with the warm and quiet ground floor. Jump into the elevator and travel to lower ground to the office area with fluro lights and plenty of office stuff to throw around. Take the stairs, or the airconditioning ducts, to the basement which is used for storage and offers wide open spaces.

I've kept the geometry the same in the upgrade but have taken advantage of the new texturing materials and environment entities. The biggest advantage through doing this means it'll run on low powered machines (my friend tested it on his TNT2 card and was getting 60fps)

[edit] Resized all screenshots on my site