The San Francisco earthquake and subsequent fire in 1906 had lasting impacts on urban development by reshaping the city’s architecture and infrastructure. The disaster destroyed a large part of San Francisco, prompting the reconstruction of buildings using modern techniques, which led to the development of seismic-resistant structures. The catastrophic event also catalyzed urban planning initiatives, resulting in improved zoning laws, fire codes, and the implementation of better public services. The rebuilding efforts transformed San Francisco into a modern, thriving metropolis, impacting urban approaches in other American cities, emphasizing safety and efficiency in disaster-prone areas.