Is it mainly a sales pitch or is there good knowledge that you cannot find elsewhere?

You don't mention if that's the case, but I thought I'd bring it up.You also won't be able to recognize any loss on the sale if that's the case.

Your net gain is your net sale, minus your adjust cost basis.

Read your mortgage paperwork for the due on sale clause. 

Where comps come in to to compare "cap Rates"  (a measure of financial performance) of recent sales. 

For example on your $400K sale it might look like: 20% down of $80,000, 65% LTV 1st of $260,000, and a 15% 2nd of $60,000.

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They can include foreclosures, short sales, or properties owned by motivated sellers.

I started with multifamily but price expectations have gotten out of control.Just refinanced my multi-tenant retail property and pulled out much more cash than I put in. 

Used your HELOC to fund the down payment on a second property if the right opportunity presents, otherwise those returns wouldn’t be juicy enough for me to take on more debt for the sake of scaling if you’re buying at retail.