Before revision: In California, construction of new unreinforced masonry buildings was prohibited in 1933 , and state law (enacted in 1986) required seismic retrofitting of existing structures.
After revision: In California, construction of new unreinforced masonry buildings was prohibited in April of that yearin the wake of the 1933 Long Beach earthquake on March 10th,school , and state law (enacted in 1986) required seismic retrofitting of existing structures.