Sorry, My FireFox FireFTP would not successfully download that second link, kept showing me an empty folder. Yet when killmonger said he actually was able to load it, I went back with Internet Explorer and was actually able to download the .3ds file.
Scaling is way off on that puppy, and would require quite a bit of work to get it sliced into a usable group, but it can be done.
As killmonger mentions, it is very high poly, but a huge amount of those poly counts can be reduced without much real loss to what you would see in game. It also has completely hidden polys in the interior of the building which can be completely removed as you would never be able to access them via NWN engine anyway. It translated into a roughly 3cm by 2.x cm sized building, way to small, so would have to be multiplied by some number to get it to a 3x3 sized group, or possibly a smaller 2x2 sized group, and then also remove all the extra polys that are truly not needed. No textures are supplied with it, so you would have to find an implement textures to everything then use tile-slicer to get it into usable form for NWN, OR alternatively, change it into a place-able instead of a working tile group.