Sell & Buy a Duplex if your primary residence has significant appreciation, selling could free up a large down payment for a duplex.

And if you join Lowe's Pros, you'll get an additional discount (it's free to join).

The property can be unappealing in some way shape or form, old, derogated, who knows maybe there was a murder there several years ago and people can look up that information online?

I can become a millionaire just by looking at street and sat view and bid online in my underwear. 

The single biggest advantage of selling your homestead is that you can take all the Cap gain tax free if you have lived in the home as your homestead for 2 of the last 5 years. 

Investments are investments- I think everyone understands that there is no guarantee for the return, but many potential benefits including the payout coming tax-free.

If you're lucky enough to get a free and clear property where the seller is willing to finance, this reduces much of the risk associated with seller-finance.I would make sure the title is then moved over to your name, especially since there is not a risk of a due-on-sale clause being triggered.

Is the line of credit different from refinancing the home that is free and clear? 

@Kelly Taylor who doesn’t like tax free atm withdrawals?  

That home was in Milpitas CA.. probably worth about 1 mil today.. but I lived there 2 years sold it made over 50k and I was off to the races.. primary home equity as I look back 50 years of ownership and multiple homes has made me well over 2.5 million in tax free gains.