When To Stop Buying And Start Paying It Off?

[Justin S.]

I'm 38 and own a small business and 18 units.  I am at a crossroads as to what to do.  When all 18 are paid off it will bring in 90-110k(after 20% off the top for main,vacancy,etc...)      

I can live off of that. 

My question is do I start paying them off as fast as I can now and maybe start buying again when I have them paid off if I feel like it......or

keep buying more now and then sell half of them(estimate) in 10 years to pay off the remainder of the mortgages on the 18 units?

This is keeping me up at night

Any suggestions would be greatly appreciated.

Thank You

J