The delinquency rate, defined as the percentage of loans 30 or more days past due, for commercial mortgage-backed securities (CMBS) rose 0.42 percentage point last month to 6.07 percent, Reuters reported.

According to Trepp LLC, a New York-based provider of CMBS and commercial mortgage information, the delinquency rate for loans underlying CMBS mushroomed 500 percent in 2009, surpassing 6 percent for the first time in December.

The report, Trepp said, underscores the rapid collapse of the U.S. commercial property market.

Among the commercial property types, hotels have been among the hardest hit, with the delinquency rate of those mortgages ballooning more than 900 percent in the past 12 months to 13.87 percent.

In December, the office delinquency rate swelled more than 560 percent to 3.42 percent, the delinquency rate for retail real estate loans in CMBS was up nearly 475 percent to 5.50 percent and the industrial delinquency rate rose more than 410 percent to 3.98 percent. Multifamily was up 325 percent to 9.27 percent.