We have seen the Conference Room scene before (in other posts). It was originally created for Radiance. The room does (or at least did) exist in reality and was painstakingly measured and re-created in a text editor (vi). See README file and credits in the repository, where I keep my test scenes in various formats. Here are the first results for Cycles, Blender’s new global illumination renderer.
The Blender file(s) for the conference room scene can be found both in the repository as well as in the download section.