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This study investigates control systems applied to parallel buildings subjected to seismic excitation. A dynamic mathematical model is developed for two coupled buildings utilizing a decentralized Direct Velocity Feedback (DVF) control strategy. The study examines different damage scenarios, including both global and local stiffness degradation, and evaluates their impact on system stability and control effectiveness. Furthermore, a comparative analysis between single-input single-output (SISO) and multi-input multi-output (MIMO) control configurations is conducted, along with an assessment of controller placement and number. The results indicate that multi-controller systems provide superior robustness and adaptability under damaged conditions, while gain tuning plays a significant role in enhancing performance and maintaining system efficiency.