vitpho/iStock via Getty Images Introduction As it has been over a year since I last discussed City Office REIT’s (NYSE:CIO) preferred shares, I think this is a good time to have another look at how the office-focused REIT is performing and if I need to take the loss on my preferred stock investment. It’s not a secret the office segment is going through a rough patch right now and I definitely like the extra layer of safety provided by the preferred shares. That being said, I obviously need to make sure  ...