Alliance Group has a well written synopsis of a recent NAR presentation on their website, here.
The most interesting chart is the distress by lender-type (i.e. CMBS vs. banks, insurance, etc.). I'm not sure the ultimate source, although it is sourced to Real Capital Analytics, but I know the numbers out of the Fed mix 30+ and 60+ delinquencies depending on which lender-type your looking at, which makes it a poor comparison. This data seems to be of better quality, and really shows the credit problems in CMBS.