CoreLogic® (NYSE: CLGX) on Tuesday reported that home prices in September increased nationally by 5.6% year-over-year from September 2017 and 0.4% from August, 2018.

Looking ahead, the CoreLogic HPI Forecast indicates home prices will increase by 4.7% on a year-over-year basis from September 2018 to September 2019. On a month-over-month basis, home prices are expected to decrease by 0.6% from September to October 2018.

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“The erosion of affordability in the highest cost markets has begun to slow home price growth,” said Dr. Frank Nothaft, chief economist for CoreLogic. “Hawaii, California and Massachusetts had median sales prices above $400,000 this summer, the highest in the nation, while annual home price growth slowed steadily between June and September in these three states. When comparing September 2018 with September 2017, annual price appreciation slowed more in these states than in the U.S. overall. Nationally, annual price growth slowed 0.5 percentage points. However, in Hawaii, California and Massachusetts, growth rates decreased by 1.7, 0.7 and 1.0 percentage points, respectively.”

According to the CoreLogic Market Condition Indicators (MCI), an analysis of housing values in the country’s 100 largest metropolitan areas based on housing stock, 38% of metropolitan areas have an overvalued housing market as of September 2018. The MCI analysis categorizes home prices in individual markets as undervalued, at value or overvalued, by comparing home prices to their long-run, sustainable levels, which are supported by local market fundamentals (such as disposable income). Additionally, as of September 2018, 19% of the top 100 metropolitan areas were undervalued, and 43% were at value.

When looking at only the top 50 markets based on housing stock, 46% were overvalued, 14% were undervalued, and 40% were at value. The MCI analysis defines an overvalued housing market as one in which home prices are at least 10% above the long-term, sustainable level. An undervalued housing market is one in which home prices are at least 10% below the sustainable level.

In 2018, CoreLogic together with RTi Research of Norwalk, Connecticut, conducted an extensive consumer housing sentiment study, combining consumer and property insights. The study assessed attitudes toward homeownership and the drivers of the home buying or renting decision process. When asked about the desire to own a home, potential buyers in the younger millennial demographic have the desire to buy, 40% are extremely or very interested in homeownership. In fact, 64% say they regularly monitor home values in their local market. However, while 80% of younger millennials plan to move in the next four or five years, 73% cite affordability as a barrier to homeownership (far higher than any other age cohort).

“Our consumer research indicates younger millennials want to purchase homes but the majority of them consider affordability a key obstacle,” said Frank Martell, president and CEO of CoreLogic. “Less than half of younger millennials who are currently renting feel confident they will qualify for a mortgage, especially in such a competitive environment.”