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.
This is true, but we can't blame all of this to Bush. Consumers began to spend on credit long before Bush took over the white house. Easy credit in a "I want it today" society was growing at a pace even when our economy was healthy and growing. This was the same time consumer savings dropped to its lowest levels. We know that over 70% of our economy is based on consumer spending; and we did that in spades. We can blame both parties for allowing the candy store to sell more on credit.
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.
I would go one-step beyond just looking at values during 2000. I would look at appreciation trends compared to economic growth, and include some level of "normal" appreciation during a time of GDP growth. The bubble was created because of several reasons; a) government pushing Mae and Mac to provide mortgage loans to questionable borrowers, b) speculators who were buying homes as investments, because many of them were becoming millionaires overnight - owning more homes as investments and rentals - using their increasing values on homes already owned to buy more (I remember those tv ads where many were bragging how many homes they owned and how much they were worth on paper, and living the good life with mansions and expensive cars), and c) then the supply exceeded the demand (even the best developers over-built homes and condos, and many are now turning them into rentals, because buyers disappeared from the landscape).
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.
No, free trade is not an attempt to counter unions. Many developed countries benefited from free trade and grew their economy. Free trade allows for the principle of comparative advantage where developed economies continue to create technology while the developing countries work to provide the products and services that requires manual labor and those that cannot be taken over by robots. Labor intensive manufacturing should go to cheaper labor countries. That doesn't mean all factories need to be removed from developed economies. The problem with the way factories have been shifting to other countries can be blamed on the captains of industry who continued to increase their salaries and benefits at the expense of the American workers. They increased their salaries and benefits 30-fold while the average worker's pay and benefits did not keep up with inflation. Most CEOs and boards have still not figured it out that their personal greed actually ends up destroying the golden egg.