Feedback from friends and neighbors can also help understand market value. 

(I assume you owe nothing, or at least less than 50% as your mortgage will have to be paid off when you sell, not when the buyer finishes paying.)My understanding is you sell $400k property with seller financing.

Thank you for help in understanding capital gains 

I understand they are not considered pets.

I have done things with attorneys, CPAs, stock brokers, insurance brokers and others successful in business.General business knowledge, understanding of financing requirements, knowing property valuations, maturity in personal financial matters to give general advice, understanding of the foreclosure process, legal aspects as to liability in leading someone into financial matters, fully understanding fraud issues and the differences in a general matter where fraud might be applied as generally thought of and what may constitute bank fraud causing or even attempting to cause a loss to an insured bank having different standards.

Mitchell Bernier, LOL it is NOT about being right, it is understanding the data and what is going on in the overall market. 

My understanding was that NAR was one of many:

This will pay it all back in 5-8 yrs if i understand how the early payoff works. still years but not decades.

Talk to Lenders: Don't hesitate to consult with lenders directly to understand their specific terms and requirements.

I understand I could go a different route and purchase rentals but I'm more interested in what people think of this strategy, to pay down my primary mortgage.