Office-to-residential conversions are growing, but are minuscule because not many towers are suitable for conversion. By Wolf Richter for WOLF STREET. The delinquency rate of office mortgages that have been securitized into commercial mortgage-backed securities (CMBS) spiked by a full percentage point in November for the second month in a row, to 10.4%, now just a hair below the worst months during the Financial Crisis meltdown, when office CMBS delinquency rates peaked at 10.7%, according to da...