Viscous mass dampers, commonly referred to as VMDs, are currently employed with notable effectiveness in tall, slender edifices and bridges over the preceding three decades. This efficacy arises from their capacity to convert the mechanical energy inherent in the structure into heat energy without detracting from the architectural aesthetic, thereby diminishing the dynamic responses and accelerations induced by wind and seismic events. Current research indicates that VMDs represent the most promising category of passive control devices available in the contemporary market. The authors examine the benchmark problem as a systematic and standardized approach to evaluate control systems, thereby facilitating an investigation of the same. The 20-story steel structure located in Los Angeles, California, serves as the central focus for the formulation of the benchmark problem pertaining to seismically excited buildings. This study endeavors to evaluate the seismic performance of VMDs within the context of the seismically active benchmark structure. The efficacy of VMDs is appraised utilizing the assessment criteria established by the benchmark problem, which considers the specified ground motions and significant structural responses, including base shear and interstory drift, among others. The results suggest that VMD dampers substantially mitigate the lateral drift of the building due to their capability to dissipate a portion of the seismic energy, consequently reducing relative motion through the damping effect.