I'm no film school grad . . . but simple me would have exposed for the highlights on one frame, then shoot a frame 3-6 stops brighter for the shadows and chairs and a third frame for perfect midtones. With the Phase preview check the histograms to confirm exposure coverage then mash together in post. Or, if you want to do all in single frame like a rockstar, get a ladder and ND film to cut the ceiling lights to have the entire scene meter within the known DR of the camera.
That all being said . . . no way this scene as originally shot exceeded 18 stops of total DR. Did it??
Edit: I understand now from rereading your #113 post that the image I corrected in post #136 is a single frame from your 5 frame bracket - not a HDR composite of those 5 frames. I'll bet with the top and bottom frames from that bracket set could be made awesome in LR4 as a composite. Point is - software is outpacing hardware at this point for creating amazing images. If you haven't upgraded to LR4 yet - do so soon. Amazing