<p>To get a little context of the history of affordability, you can look at the National Association of Homebuilders Housing Opportunity Index. </p>
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http://www.nahb.org/page.aspx/category/sectionID=135
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<p>For the data addicts on the board, it has quite a bit of info on various metro areas. Unfortunately, the series for Orange County only goes back to 2005 (for other areas, there is also data missing for late 2002 and early 2003).</p>
<p>If you look at Los Angeles as a similar example, in the late 1990s, affordabiliy ranged between about 40% and 50% of homes that a median-earning family could afford with a 30-year loan and 10% down. In 2002, the median LA County house cost $240k, exactly 33.3% more than the US average. There was a similar "premium" for living in LA from the mid 1990s to 2003. </p>
<p>By June of 2007, LA's median house was $530k, 121% more than the US average. The median income could afford only about 3% of the homes being sold in LA County. </p>
<p>Thus, you can see how much the premium for living in LA has changed in 5 years. Has LA become a much better place to live in that time? Has the rest of the US gotten much worse? I don't think so. </p>
<p>This situation happened before, in the last Southern CA price runup. LA home prices were 80% above the US median in 1991. Four years later, they had dropped to 38% above the national average. </p>
<p>Here is the NAHB's explanation of how the index is compiled:</p>
<p>"The Housing Opportunity Index (HOI) for a given area is defined as the share of homes sold in that area that would have been affordable to a family earning the local median income based on standard mortgage underwriting criteria. Therefore, there are really two major components -- income and housing cost.</p>
<p>For income, NAHB uses the annual median family income estimates for metropolitan areas published by the Department of Housing and Urban Development. NAHB assumes that a family can afford to spend 28 percent of its gross income on housing; this is a conventional assumption in the lending industry. That share of median income is then divided by twelve to arrive at a monthly figure.</p>
<p>On the cost side, NAHB receives every month a CD of sales transaction records from First American Real Estate Solutions (formerly, TRW). The data include information on state, county, date of sale, and sales price of homes sold. The monthly principal and interest that an owner would pay is based on the assumption of a 30 year fixed rate mortgage, with a loan for 90 percent of the sales price (i.e., 10 percent downpayment). The interest rate is a weighted average of fixed and adjustable rates during that quarter, as reported by the Federal Housing Finance Board. In addition to principal and interest, cost also includes estimated property taxes and property insurance for that home. This is based on metropolitan estimates of tax and insurance rates from the 2000 Decennial Census, as estimated by NAHB from the Census Bureau's Public Use Microdata Sample (PUMS). Mortgage insurance is not currently a component of the HOI." from <a href="http://www.nahb.org/generic.aspx?sectionID=135&genericContentID=533">http://www.nahb.org/generic.aspx?sectionID=135&genericContentID=533</a></p>
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