This document examines the influence of plan irregularity on the seismic response of 10-story reinforced concrete buildings through static and dynamic analysis. Three building plans are considered - rectangular, C-shaped, and L-shaped. The buildings are modeled in SAP 2000 software and subjected to static, response spectrum, and time history analysis using records from three Indian earthquakes. Results show the L-shaped building experiences higher story shear and deflections compared to the other shapes. Time history analysis provides more realistic results than static or response spectrum analysis by applying actual earthquake accelerations. Plan irregularity influences seismic response, with more irregular shapes experiencing greater forces and deformations.