First, nobody has mentioned how much real estate declined in Japan- the answer is 75%. That's right 75%!
Second, one reason for the ridiculous appraisal values is so that the city/state can realise higher tax revenues. This is especially true in soCal, where the budget problems are well known. I might even go so far and say the state/town/city is in cahoots with the appraisers- maybe by way of incentives or kickbacks, I don't know- and I don't mean everyone either...
Last, like Traden4Alpha said this is a 1-2 Bubble. Personally, I think the powers that be wanted it this way. What better way to separate the sheep from their cash? If someone's goal is to fleece the population, what better way to accomplish that fact than with a 1-2 speculative Bubble?
All IMHO, of course.