Here is a list of 25 possible mis-steps when you are considering investments in commercial real estate. How about number one, buying properties with low cap rates, seems like a no brainer, however, when you are buying a property that has an existing 10+ year lease and established tenant(s), low cap rates still trump CD rates. Take a look, a good list to keep handy.
http://www.globest.com/commentary/finance/25-Big-Mistakes-Made-in-CRE-Investing-353333.html