Abstract: An improved building support system for minimizing the effects of strong seismic shocks to building structures transmitted through the earth to the foundation of the building structure, by laterally isolating the building base support structures from earth movements, comprising a first set of sliding bearing plates operably coupled to the base of the support columns of the building structure, a second set of sliding bearing plates fixedly mounted to the foundation and disposed in complementary sliding relationship to the first set of sliding bearing plates, a plurality of flexural members each fixedly coupled intermediately thereof to the support columns, and each flexural member being pivotally anchored at the ends thereof to a mounting post, each mounting post being moveably disposed along the longitudinal axis of the flexural members to which the mounting posts are secured and having a pair of apertures therein with bolts therethrough whereby said improved building support system provides a means for permi