http://old.post-gazette.com/lifestyle/20011208lowry1208fnp3.asp
I saw this on PBS, it was quite interesting.
....Analysis showed that the living room cantilever supports not only itself but the one above it -- the master terrace that leads from the master bedroom and rests on the living room's steel window frames. To stop the deflection, Silman determined there was only one pragmatic solution: Strengthen three of the four concrete beams under the living room with a post-tensioning system that will hold them tautly in place. High-strength steel cables will be added along each side of the beams, with one end anchored in new concrete blocks attached to the beams and the other end fed through a hole drilled through the outside wall of the living room.
Hydraulic jacks will gradually tighten the cables and then permanently anchor them, stopping the deflection. The engineers won't try to correct it; at this point that would only cause more problems. Just as importantly, the deflection will continue to tell, at a glance, the 20th-century history of the house.
In addition to making other structural repairs, workers also are waterproofing the flat-roofed house. Water damage is especially evident in the guest bathroom, where the cork walls are stained and concrete is spalling.
The house that cost $155,000 to build will take $11.5 million to restore, a figure that also includes water treatment, sewage and landscape improvements to be done over the next few years. Restoration of the house will be completed next year......