ASDi performed a voluntary seismic upgrade to the North Wing Classroom building, originally built in 1939. The building was constructed of concrete walls with steel trusses, creating a saw-toothed profile. The building was damaged during the 1983 Coalinga earthquake, and sat unused for many years. Structurally, the building was lacking a continuous diaphragm as well as any interior lateral resisting elements, so in an effort to meet current seismic code requirements, ASDi added a steel bracing diaphragm and several interior steel braced frames. One of the unique aspects of this project, was the incorporation of the existing concrete pilaster columns as part of the new braced frames. ASDi was able to detail connections for the new HSS braces to the face of these concrete pilasters capable of transferring the seismic forces.