Eanhquakes pose a significant threat to the safety and stability of built structures. making seismic performance evaluation an essential aspect of modern structural engineering. Steel buildings, known for their high ductility, strength-to-weight ratio, and superior energy dissipation capacity, have emerged as a preferred solution in seismic regions. This study investigates the seismic behavior of a multi-storey steel building using advanced analytical tools and codal provisions, with the objective of understanding its dynamic response under earthquake loading. A derailed 3D structural model was developed using ETABS/STAAD Pro, and seismic forces were evaluated in accordance with IS 1893:2016, while member design considerations followed IS 800:2007. Response Spectrum Analysis (RSA) and Time—History Analysis (THA) were performed to assess critical parameters such as base shear, storey drift, lateral displacement, and structural stability. The results highlight the significance of structural configuration, bracing system selection, and stiffness distribution in determining overall seismic performance. Observed trends indicate that proper detailing and optimized member design substantially improve ductility and reduce seismic demand. The study provides valuable insights into the dynamic characteristics of steel buildings and offers recommendations for enhancing seismic resilience through performance-based design. The findings contribute to safer, more efficient, and code-compliant steel construction in earthquake-prone areas.