This Bloomberg story is a little breathless, but there can be no doubt now that the credit crunch has spread to commercial property. Will be interesting to see how this affects Baltimore.

The cost of derivatives protecting investors from defaults on the highest-rated bonds backed by properties more than doubled in the past month, according to Markit Group Ltd. Prices suggest traders anticipate defaults rising to the highest level since the Great Depression, according to analysts at RBS Greenwich Capital in Greenwich, Connecticut.

The seven-year rally in offices and retail properties ended in September when prices fell an average of 1.2 percent, according to Moody's Investors Service. More losses are likely because banks are holding $54 billion of commercial mortgages they can't sell, data compiled by New York-based Citigroup Inc. show.

Lenders are struggling to sell loans to investors after losses on debt backed by subprime mortgages to people with poor credit caused financial markets to seize up in July and August. Bonds with AAA ratings secured by properties ranging from the Sears Tower in Chicago to trailer parks in Delaware yield about 203 basis points more than similar maturity Treasuries, up from 92 basis points on Oct. 12, according to Morgan Stanley indexes.