WASHINGTON (AP) -- Home prices in major areas have reached their lowest level since the housing bubble burst in 2006, driven down by foreclosures, a glut of unsold homes and the reluctance or inability of many to buy.
Prices fell from February to March in 18 of the metro areas tracked by the Standard & Poor's/Case-Shiller 20-city index. And prices in a dozen markets have reached their lowest points since the housing crisis began. Prices in March rose only in the Seattle and Washington, D.C., metro areas.
The nationwide index fell for the eighth straight month.
A record number of foreclosures are forcing prices down, and they are expected to keep falling through this year.
The 12 cities now at their lowest levels in nearly four years are: Atlanta, Charlotte, Chicago, Cleveland, Detroit, Las Vegas, Miami, Minneapolis, New York, Phoenix, Portland, Ore., and Tampa.
The Case-Shiller index measures sales of select homes in those cities compared with January 2000. For each of the areas it reviews, the index provides a three-month moving average price. By measuring the sales prices of the same homes over time, the index seeks to gauge market values and conditions.
The housing sector is struggling even as the overall economy is in the midst of a steady but slow recovery. Some of the worst declines in home prices are in cities hit hardest by unemployment and foreclosures, such as Phoenix, Tampa and Las Vegas.
They are flooded with homes sitting vacant, awaiting buyers. Many banks have agreed to allow homes at risk of foreclosure to be sold for less than what is owed on their mortgages. That trend has pulled down prices further.
Coastal areas, such as San Francisco, San Diego, Los Angeles, Washington and Boston, have fared comparatively better in the past two years. They have been aided by healthy local economies and low unemployment, desirable city centers and limited space for new housing.
But the damage is now spreading to areas that had long escaped the worst of the crisis. They include once-thriving markets, such as Dallas, Denver, Minneapolis and Cleveland. Economists regard them as housing bellwethers - metro areas that are reliable indicators of where national prices are headed.
Denver and Dallas are on pace to hit post-housing bust lows in the next few months.
In the seven years before its peak in July 2006, the home-price index surged 155 percent. Since then, it's fallen 33 percent.
"We look for further declines to be registered in the quarters ahead," said Joshua Shapiro, chief U.S. economist at MFR Inc.