Multiplicity of the required sensors in the centralized control of large-scale structures, leads to excessive data transmission and resulting system lags. On the other hand, decentralized control, as an alternative approach, offers sub-optimal responses. In this paper, an innovative estimation procedure to compensate for the mentioned deficiency is presented. In this method, a substructure is ... [Show full abstract] equipped with an embedded Luenberger observer, which estimates the whole state of the structure based on the available ones. Then, the actuator commands are locally calculated by the estimated states. To evaluate the proposed method, fully decentralized control of a three storey frame structure and semi-decentralized control of a 20 storey one are investigated. Comparison of the estimated states with the measured ones indicates the acceptable accuracy of the utilized estimator. Precision of the structural responses controlled by the estimated states introduces the proposed method as an appropriate alternative for the centralized one. The approach provides an efficient decentralized control by eliminating numerous sensors and excessive data communication.