The focus of this research is a nonlinear response analysis of how a city office in Koriyama city was affected by The Great East Japan Earthquake, 2011. Nonlinear pushover and dynamic analysis are performed in two different analytical models, designated first and second. The first structural model only takes into consideration column flexural capacity without regards to deterioration in post-peak behavior, and the second structural model takes account of shear capacity with regards to post-peak behavior. Using these analyses, a damage evaluation is conducted and compared to the post-earthquake damage report prepared by a research team from the Building Research Institute (BRI) and National Institute for Land and Infrastructure Management (NILIM). Through the use of these comparison results, analytical models commonly used in literature are judged in terms of their adequacy in representing the dynamic response of structures. In addition, there is a critical assessment of the seismic evaluation process used in the Standard for Seismic Evaluation of Existing Reinforced Concrete Buildings, 2001.