Its still dangerous due to are areas of landfill. They also really did not enforce building codes till rather recently.
I can't imagine if I was building something there that I wouldn't follow proper seismic engineering guidelines; code or no code.
I stayed in the Marine district last summer for a week; and I tried to see where the damage happened in that area in 89.
That was one of the hardest hit areas, as that is where the 1906 debris was dumped I think.