I've found clear materials to be difficult to make in Blender so I decided to share a working model. It's a very simple shop that I'll likely improve on in the future (rigged door, better mesh, etc), but its got clear windows and some cool lighting affects. Let me know if it helps!
BLEND (Blender, filesize: 767 KB), FBX (Autodesk FBX, filesize: 53.7 KB), STL (Stereolithography, filesize: 105 KB)