Descending geographically in scale from the global border to the border neighborhood, this installation focuses on the San Diego-Tijuana conurbation, among the largest binational metropolitan regions in the world, with more border crossings daily than any other check point in the western hemisphere. We investigate border cities as laboratories for new strategies of interdependence and collective action. Our research-based political and architectural practice is embedded in this region. We have developed the UCSD Cross-Border Community Stations as an infrastructure for coexistence between divided communities. The Community Stations are field hubs located in immigrant neighborhoods on both sides of the border where research, teaching and urban advocacy are done collaboratively among university researchers, students and community leaders.