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This paper addresses the seismic assessment of a two-story historic building located in Gilroy, California, using the simplified three-dimensional analysis approach. This building is referred to herein as the Gilroy Firehouse. The Gilroy Firehouse is selected for further study in this work since its detailed as-built information is available and its strong motion data was recorded during the Loma Prieta earthquake, which struck the San Francisco Bay Area on October 17, 1989. Three motions at the ground floor slab and three motions at the roof level were recorded at this building during the Loma Prieta earthquake. The building withstood the ground shaking with little damage. The study of its survival during the Loma Prieta earthquake can enhance the understanding of essential URM buildings in Mid-America. The goals of this study are to demonstrate the use of the simplified three-dimensional MDOF approach for a representative multiple story building with multiple floor and roof diaphragms; to investigate reasons why the firehouse withstood the ground shaking with little damage.