I am also into residential real estate and was wondering why you chose to go the cash route especially when rates have been so low. For instance, in the properties that I am currently in business for, for 20% down I able to fetch a 30% ROI after mortgate + all fees incl. property management, taxes, insurance, etc... For the same properties, if I would go all cash, my return would be closer to 11 to 12%. Of course with the mortgage approach, it tends to be a bit slow (i.e. a mortgage at a time) and longer to scale to the same levels of in terms of absolute monthly returns since my monthly cash flow is lower in absolute terms.
Interested in your thoughts.