I have 2 property rentals. In 2005 I took out a 5 year fixed mortgage at 4.5%, as part of that deal at the end of the 5 year term the interest rate would change to 0.75% above the base rate, luckily for me by that time the base rate was 0.5% so effectively I then had a mortgage at 1.25%, I ploughed everything into it and had my mortgage paid off by 2015, I then remortgaged and bought the 2 property rentals.