Why was Daniel Burnham’s plan for San Francisco not carried out after 1906?

Daniel Burnham’s comprehensive plan for San Francisco, devised in 1905 under the auspices of the Association for the Improvement and Adornment of San Francisco, was not implemented in the aftermath of the 1906 earthquake. While the disaster leveled much of the city's center, the immediate necessity for rapid reconstruction and the logistical challenges of rebuilding meant that the ambitious, large-scale redesign was ultimately set aside in favor of more immediate recovery efforts.12