After edge-looping and subdividing about 30 percent of the walls, I decided to go another route. I found that this approach was taking a lot of time because the subdivide multi fractal was creating non-manifold meshed which I had to fix by hand. In addition, this was adding an insane number of polygons to the model.
I should be able to get a good effect by using a normal map for most of the walls. I reverted to an earlier version of the file and made a few corrections that I had run across during the subdivision work.
So, at this point, I am declaring the remodeling work completed and am moving on to texturing. This is where I believe that I can make the biggest improvements over the original model.