Script Kitty, I started out by using a Pigg Viewer to look at Defnames in the Bin file. Use Pigg Viewer to extract that, and then you can look thru the file with Notepad or a similar utility. Be warned--it's still a mess. Generally, anything with a leading underscore, like _stairsbrickbldg would be just a sub-piece of a larger model. Usually those pieces are found around the same section of the file as the pieces they construct (which won't have a leading underscore). If there's something in particular you're looking for, you can try searching the document. You may need to try a few different words or abbreviations: Kings, KR, etc for King's Row.
After I get the name of a few promising-sounding parts, I then put them in a blank map as Leo explained, using the white sky scene file (see Leo's post for more directions). After I've shot a bunch of different pieces, I put them together in Photoshop (where I usually end up scaling them down to a manageable size).
Be aware some pieces might not be viewable from all angles--many building textures are one sided, and if your camera is positioned inside the building, you might not see anything. Unhooking the camera is usually a good idea, and if you need the new camera coordinates to shoot other models of a similar size/shape, just fire up Cameraman to give you the numbers.
Let me know if you need any other help with this.