@littlek,
It is hard to find the market value to the real estate especially as the factors leading to the inflated values were made for political reasons:
1) Bush had a huge debt and deficit and the normal procedure would be to issue bonds to fund the Iraq War and the Free Trade which was leading to job losses. To get people to buy bonds would require the Federal Reserve Bank to offer higher interest than commercial banks would thus leading to a small credit crunch as it would suck up much money and would lead to a recession. W didn't want a recession.
2) He stimulated the housing industry, which employes a lot of people, with low interest rates and promoted home ownership. But with the deregulation and greed it created a bubble in the housing market and inflated housing prices. The best way to estimate the market value would to go back to the prices of houses before the government stimulation started to get a good handle on the prices. Prices at around 2000 would an accurate market value of the houses. However, the bubble created an excess of housing products so there is now an over supply of homes so prices will have to drop to sell off those homes.
3) Free Trade is an attempt to counter unions so many high-paying jobs disappeared to cheaper overseas labor markets leading to fewer American high-salaried workers which compounds the problem of affordability of high price homes.