Prepayment of principal is what retires debt more quickly and saves interest expense.

This will save a big chunk of cash for future investment and may shorten your investment time table.If you were already loaded down with lots of debt, or were getting much higher interest rate, or adjustable rate, or for a shorter period of time, or you were in the pre-retirement phase of your investing career, then the answer would be different.

In my business there are a lot of jerks, one reason real estate needs to help me retire early.

I've never had a business plan because I don't look at Real Estate as a business but rather as a long term Investment for my Retirement and Financial Future.

I know some people are shooting for a 15 year retirement plan.

(Plan to retire "young")RE agent advising me to buy/ flip and sell as she knows the area well.

Didn't want someone to lose their little retirement, but didn't think government should interfere.  

My focus is on growing cashflow ASAP so I can fund my retirement in the future.

However, that same high-demand property will sit vacant in the winter because the snow-bird retired couple doesn't want 6 bedrooms and 3,700 sq ft.  

My plan is to sell the business when I retire in 15 years, so I have to structure it from the beginning as an entity that someone can pick up and run with when I'm gone.