The 0.18% month-over-month decline in Case Shiller home price index is the biggest since July 2014 which confirms the David Blitzer's view that "over the next two years or so, the rate of home price increases is more likely to slow than to accelerate." His biggest fear is that "first time homebuyers are the weak spot in the market," adding that prices are increasing about twice as fast as inflation or wages. Moreover, other housing measures are less robust - housing starts are only at about 1.2 million units annually, and only about half of total starts are single family homes. Sales of new homes are low compared to sales of existing homes.

From the report:

The 10-City Composite and National indices showed slightly higher year-over-year gains while the 20-City Composite had marginally lower year-over-year gains when compared to last month. The 10-City Composite gained 4.7% year-over-year, while the 20-City Composite gained 4.9% year-over-year. The S&P/Case-Shiller U.S. National Home Price Index, covering all nine U.S. census divisions, recorded a 4.4% annual increase in May 2015 versus a 4.3% increase in April 2015.

Denver, San Francisco, and Dallas reported the highest year-over-year gains among the 20 cities with price increases of 10.0%, 9.7% and 8.4%, respectively. Ten cities reported greater price increases in the year ended May 2015 over the year ended April 2015. New York and Phoenix reported six consecutive months of increases in their year-over-year returns since November 2014. Year-over-year returns in New York increased from 1.3% in November 2014 to 3.0% in May 2015, and Phoenix climbed from 2.0% to 3.8% in the same period.

Month-over-Month

Before seasonal adjustment, in May the National index, 10-City Composite and 20-City Composite all posted a gain of 1.1% month-over-month. After seasonal adjustment, the National index was unchanged; the 10-City and 20-City Composites were both down 0.2% month-over-month. All 20 cities reported increases in May before seasonal adjustment; after seasonal adjustment, 10 were down, eight were up, and two were unchanged.

The commentary was, in typical Case Shiller style, mixed with the usual warning that the current pace of price appreciation is unsustainable:

"As home prices continue rising, they are sending more upbeat signals than other housing market indicators," says David M. Blitzer, Managing Director and Chairman of the Index Committee at S&P Dow Jones Indices. "Nationally, single family home price increases have settled into a steady 4%-5% annual pace following the double-digit bubbly pattern of 2013. Over the next two years or so, the rate of home price increases is more likely to slow than to accelerate. Prices are increasing about twice as fast as inflation or wages. Moreover, other housing measures are less robust. Housing starts are only at about 1.2 million units annually, and only about half of total starts are single family homes. Sales of new homes are low compared to sales of existing homes.