The euphoria associated with the US economy even as the overall global economy is rolling over means that those bearing the brunt of risk for commercial mortgage backed securities are getting paid the least. This also comes as a result of investors chasing yield, which could be another obvious canary in the coal mine that the now record bull market could be reaching an apex.

"As you get toward the latter innings of the credit cycle, people have money they need to put to work and they take on more risk for less return," said Alan Todd, a CMBS analyst at Bank of America Merrill Lynch.