The new release of the seismic regulation in 2018 resulted in major changes in masonry structures' design approach. It changes from the allowable stress design method to the ultimate strength design method. Also, the effect of vertical earthquake component, which was not considered, is included in the analysis combinations. The seismic risk is started to be defined by parameters determined according to the geographical coordinates of the building that is considered. The presented study is intended to investigate the impact of the listed changes on unreinforced masonry design. A case study building is utilized for this purpose. It is designed to satisfy the TER-2007 requirements and re-evaluated considering the TER-2018 requirements. The results show that the building did not have sufficient capacity, according to the 2018 earthquake regulation. Almost all the walls were beyond their capacities. The same structure has been analyzed by nonlinear static analysis (pushover analysis) as well. According to the nonlinear analysis results, performance assessment was made per the 2018 earthquake regulation and FEMA356. The performance evaluation by nonlinear static analysis using TER-2018 and FEMA356 demands, satisfies the life safety performance level for FEMA356 and TER-2018.