This issue of the Forum Journal, published in partnership with CityLab, takes a deep dive into ReUrbanism—the National Trust for Historic Preservation’s commitment to pursuing reuse, reinvestment, and revitalization in cities. ReUrbanism holds that building reuse, which drives economic growth and shapes dense, walkable, thriving streets where vibrant communities can flourish, should be the default—and demolition a last resort. Expanding the urban reach of preservation can harness reuse to support vibrant, diverse, and equitable communities.