Originally built circa 1922, the two large corbels adorning the main entrance of Stanford’s first student union have experienced severe deterioration over the past 85 years until their restoration in 2007. The corbels were constructed from precast concrete, and were designed to be hollow inside with steel bars running throughout for reinforcement. As water penetrated through the corbels, the steel reinforcements began to rust and expand, causing severe cracks throughout. In many places, large chunks of the corbels had fallen off, or were sitting loose in place. Additionally, the tops of the corbels were seperated from the wall and slowly falling forward.