Below is a comparison of the Moodys/REAL Commercial Property Price Index (CPPI) and the Case-Shiller composite 20 index. Beware of the "Real" in the title - this index is not inflation adjusted.
Click on graph for larger image in new window.CRE prices only go back to December 2000. The Case-Shiller Composite 20 residential index is in blue (with Dec 2000 set to 1.0 to line up the indexes).
According to Moody's, CRE prices are about 42% below the peak in 2007.
It is important to remember that the number of transactions is very low and there are a large percentage of distressed sales.
Here is an article from Bloomberg: http://www.bloomberg.com/news/2010-12-20/u-s-commercial-property-rises-for-second-consecutive-month-moody-s-says.html