The study investigates the seismic responses of base-isolated buildings of varying heights equipped with Lead Rubber Bearings (LRBs) as isolation systems. Four shear type base-isolated buildings (6-story, 12-story, 20-story and 40-story), were analyzed under 14 historical ground motion records. These records included six far-field earthquakes and eight near-field earthquakes, with the latter further divided into four pulse-type and four non-pulse-type motions. The earthquake response of the buildings was assessed based on key parameters such as bearing displacement, roof displacement, roof acceleration, base shear, and story drift. The results indicate that base-isolated buildings subjected to far-field earthquakes exhibit lower structural responses compared to those under near-field earthquakes, with the highest responses observed under near-field pulse-type earthquakes due to their strong velocity pulses. This finding suggests that BI buildings are more susceptible to near-field pulse-type ground motions. Additionally, as the height of the BI buildings increases, bearing displacement generally decreases across all earthquake types, suggesting that taller buildings experience reduced displacement demands on the isolation bearings due to their longer natural periods. However, with increasing building height, roof displacement, base shear, and average story drift ratio also increase, indicating a greater overall structural response in taller buildings. Furthermore, the highest roof accelerations were found in 12-story and 20-story buildings, highlighting that certain building heights may be more susceptible under certain seismic conditions.