The brushwork is very competent. Good, working doors are also a plus.

Visually this map is really suffering from the lack of a 3D skybox. To me there also really needs to be a fence texture or something tiled around the level, because from experience I'd expect some people will immediately try to jump to their deaths and be very disappointed to hit an invisible wall.

Considering how inexpensive the map is, it might be worth using expensive water to make the puddles around the map instead of a reflective decal.

You gotta work more on details, lighting and radar. Remaking the layout is not enough imo.

Notes: Sry but this one is a way better remake.
http://www.fpsbanana.com/maps/19118
http://www.mapping-area.com/forum/de-vertigo-pro-vt12500.html?sid=6a43e86e9cdd79945c14395b1633bd1a

Looks great! just like the old one.