<p>Several existing reinforced concrete buildings in Pakistan do not fulfill the new seismic code provisions as they have not been designed to meet these requirements, since they were built decades ago either on old codes in which no seismic provisions were incorporated or on mason experience. Reacent seismic incidents have also revealed that RC buildings designed without specific seismic provisions can undo significant damage or even collapse during moderate to strong ground motion. So, this research focuses on one of such buildings that do not adhere to current seismic guidelines mentioned in BCP 2021. To follow up the above investigation, “incremental dynamic analysis” and “nonlinear static analysis” were used to examine the building after initial site investigation, testing and numerical modelling. The building fulfilled performance goals, according to the static analysis, however there was substantial member-level damage because of low base shear and low stiffness in building’s longer direction. Furthermore, dynamic analysis showed that the building’s stiff-weak configuration, which had insufficient strength in the x-direction and too much stiffness in the y direction, was the source of excessive drift and displacement in the x-direction. To overcome these issues different retrofit techniques were considered and compared. Shear walls were added in the building’s x direction, Column jacketing was used on the building’s first and ground floors, as most columns were failed in these two stories. Results reveal that shear walls were successful in minimizing building damage and efficiently managing displacement. The results highlight the necessity of renovating older buildings in high-risk areas to increase their seismic resilience.</p>