Purbalingga is regency with a potential moderately high seismicity requiring compliance of planning and implementation rules of the earthquake-resistant structural system. The purpose of this research is to evaluate the performance of a ten-story irregular apartment building model in Purbalingga due to the seismic load. The research is necessarily conducted in order to provide information on impacts and mitigation strategies that should be implemented. This research was conducted based on the seismic load of 2002 and 2012 Indonesian National Standard (SNI) including linear static analysis, dynamic response analysis, and pushover analysis. Based on linear static analysis, it shows that the base shear is reduced and the drift ratio level decreases respectively for X and Y direction. Meanwhile, based on the dynamic response analysis, the drift ratio level also decreases respectively for X and Y direction. In addition, the pushover analysis indicates that the performance of this apartment building model is still at Immediate Occupancy (IO) level as the post-earthquake damage state that remains safe to occupy, essentially retains the pre-earthquake design strength and stiffness of the structure. The risk of lifethreatening injury as a result of structural damage is very low, and although some minor structural repairs may be appropriate, these would generally not be required prior to reoccupancy. [ABSTRACT FROM AUTHOR]