My goals have changed in the last couple of years.
I'm not going for the 10 properties anymore and I stopped at 7, but then sold 2 for 1 for a big profit (double what I paid for it!) and now have 5 properties, 1 for residential, 3 for long term rentals, 1 for short term rental, and I've started buying mortgage notes which I have bought two so far where I am the bank and not dealing with property taxes, insurance, or repairs as these notes are for land lots with owner owned mobile homes.
I'm making good money as is without having to buy more properties, which I don't want to do anymore, I've reached my tolerance level, and want to avoid more cost to me in terms of, insurance, repairs, taxes, dealing with tenants, etc.
No, I have not paid off any of my properties, so to answer your question I was not paying them off before I bought another one. I don't pay it off because I want the tenants to pay off my mortgage with their rent. I get to write off the mortgage interest on my taxes.
My residential will be paid off in 2023 :)