To formulate a "systems-based" plan to address the PK-12 infrastructure crisis, in 2016, the 21st Century School Fund (21CSF) and the University of California-Berkeley's Center for Cities + Schools (CC+S), in partnership with the National Council on School Facilities and the Center for Green Schools at the U.S. Green Building Council, launched the "Planning for PK-12 Infrastructure Initiative" (P4si Initiative). In Phase 1 of the P4si Initiative (Fall 2016), a research team from 21CSF and CC+S facilitated a structured national engagement process to identify the challenges to adequacy and equity in PK-12 infrastructure and to propose system reforms. This process garnered input from 85 leaders from 33 states and the District of Columbia who represented a diverse group of nonprofit advocacy leaders, local and state officials, researchers, building industry professionals, labor advocates, and finance experts. Fifty-five priority actions were identified to address the systemic problems of delivering adequate and equitable public school facilities. Phase 2 of the P4si Initiative will move the 55 priority actions forward to achieve a paradigm shift in the PK-12 public infrastructure systems.