Commercial real estate prices may fall as much as 15 percent during the next year, Bloomberg reported, in the broadest decline since the 2001 recession.

In July, investors bought the fewest U.S. commercial properties since August 2006 and apartment building acquisitions were down 50 percent from June, according to New York-based Real Capital Analytics Inc.

The average price for commercial properties might drop 5 percent to 15 percent in the next two years depending on the type of property and its quality and location, said Matthew Ostrower, an industry analyst at New York-based Morgan Stanley.

About 930 commercial real estate transactions valued at $5 million or more closed in July, the lowest monthly total this year.