I'm not sure how many brick buildings there actually are. (After the 1906 and 1989 quakes, the flimsiest buildings were knocked down.) San Francisco has fewer brick buildings than most major cities...

And it's also something people (including the government) are aware of and watching carefully. San Francisco retrofits its brick buildings -- over 2,000 by the year 2008 -- and it actually made headlines that there were 150 at that time which hadn't already been retrofitted.

https://www.sfgate.com/news/article/150-S-F-brick-buildings-...