What would you do with six rental properties without mortgages

[Fred Cannon]

Just curious about BP opinions. I have 6 mortgage free properties that I bought around 2010 when the market had crashed. I am thinking about taking out my original purchase money thru a mortgage. Actually in would be much more that my purchase price. I paid anywhere from 30K to 45K for these properties (condos) and I cash flow around 700 per unit. if I took out a 75K mortgage (75% LTV ) I would still cash flow around 300 per month I am retired and like having the monthly income but it would be nice to get the money out as well. What would you do.