You don't have to be a card carrying member of the Geologists Society to see those buildings are set on 100' or so of packed sand. Not granite. Pacifica could have torn down buildings 20 years ago and then remounded the vertical cliffs of sands that take the pounding of the surf mano e sand-o. Mano is winning easily right now.
But they took the worst action- none- they could take. Its obvious that building codes of 60 years ago are way out of date of modern science. What might have been a few dozen feet of lost coastal lands is now a huge gaping sand pit sculpture washing millions of cubic yards of Pacifica away to El Nino.
Just tear the dam buildings down..bulldoze a gentle dip, a hilly slope, to the new "beach"..and stop risking peoples lives.