The engineering properties of Concentrically Braced Frame (CBF) Systems have the potential to meet multiple performance objectives. However, previous research has shown that current design can lead to soft stories, unexpected failure modes or premature brace failure. To meet the engineering needs of the next-generation of seismic resisting systems, an international research team is working to develop Tomorrow’s Concentric Braced Frame (TCBF) with support from the NEES program at the National Science Foundation within a NEESR Small Group project entitled International Hybrid Simulation of Tomorrow’s Braced Frame Systems. The international team of collaborators includes researchers from the University of Washington (UW), the University of California, Berkeley (UCB), the University of Minnesota (UM), NCREE laboratory in Taiwan, researchers in Japan and Canada, industry professionals, and practicing professional engineers. TCBF-1 is the first of several multi-story frames that will be tested in the NCREE laboratory under the guidance of Professor K.C. Tsai in collaboration with his US colleagues. This first test has been developed using verified FE models to test a mid-span gusset of a multi-story X-braced frame. A balanced design procedure has resulted in the test frame and is expected to rely on cyclic yielding of the brace while permitting distributed yielding into the gusset plates and framing elements to maximize the story drift capacity of the system.