That looks about right. About four years ago, when we started looking for a home, I saw one advertised for $449,000 in Lafayette (San Francisco East Bay area). The house was a 2 bedroom, 1 bath fixer upper on a postage-stamp size lot. It's probably worth much more today. People buy them, and Lafayette is in demand because it has one of the better school districts. It's shocking.
The worst part is that a new doublewide would be three times the size and far better looking than that house for more than half a million. It makes all those mobile home jokes not sound so funny.