Since the east span of the Bay Bridge opened in the fall of 2013, demolition crews have been busy deconstructing the old–taking down over 50,000 tons of steel. While most of the steel will be sent to China as scrap, one Bay Area entrepreneur, David Grieshaber, wants to save a portion to create a mixed-use building, housing a museum, a private apartment, and an Airbnb rental. The Airbnb fees would, hypothetically, keep the non-profit undertaking running. The frame of the project would incorporate the original steel beams (about 1.3 percent of the total bridge) and the floors would use the pavement (and even keep the lane markers). The design would also feature green systems such as rainwater collection, solar panels, and a green roof. The final location for the house has yet been determined. More info on the Bay Bridge House, here.