Understanding how building shapes influence their response to earthquakes is key for structural engineers aiming to design safer, more resilient structures. This study explores the seismic behavior of buildings with different plan configurations—regular and irregular—under earthquake-induced lateral forces. Using SAP2000 software, three models were analyzed: a rectangular shape, a C-shape, and an I-shape. The study focused on how story displacement changes along the x- and y-axes as building height increases. The analysis followed the Linear Static Analysis method (also known as Equivalent Static Analysis) in compliance with Indian Standard codes, which consider various loading conditions. To compare the seismic performance of the three models, the Best Worst Method was used to assign weightages to each, culminating in a combined response curve that reflects their relative behavior under seismic forces. The results showed that buildings with irregular shapes, like the C-shaped and I-shaped models, experience significantly larger story displacements compared to the rectangular model. This highlights their greater vulnerability to earthquakes. The findings emphasize that the geometry of a building’s plan plays a crucial role in its seismic performance. By shedding light on the impact of irregularities in building plans, this study underscores the importance of optimizing configurations to improve earthquake resistance. These insights provide structural engineers with valuable guidance for designing safer buildings that perform better during seismic events.