This document analyzes a steel braced symmetrical reinforced concrete building with and without designed I-sectional rubber base isolators. The building is modeled in ETABS software and response spectrum analysis is conducted. Base isolators are designed as I-sections to isolate the structure from ground movements during earthquakes. Analysis shows that with base isolators, displacements, drift, and base shear are reduced, indicating lower earthquake effects on the building and more stable performance. Therefore, steel bracing combined with base isolators is effective at minimizing earthquake damage to structures.