[arrosenberg]

Brick buildings don't do well with earthquakes. California also happens to sit on a major, active fault line. While it is technically possible to make a brick or stone building earthquake-proof, I would imagine it's cost prohibitive for large scale single-family housing projects. Apartment towers are already built with a multistory steel-reinforced concrete base that is built to withstand earthquakes, but it would increase costs significantly to build to the top like that.