80% of original property value

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Hey Everyone,

I recently made a commitment to get into real estate investing using the buy and hold strategy for renters, so i've been reading BiggerPocket's "the book on rental property investing" and I feel like I have clear understanding of my plan and strategy. Basically, i want to start with a fourplex and rent it out. However, i'm wanting to get some more information on how exactly you go about buying a property from a seller for 80% of the original value? The book speaks about buying the property for 80% of its original value for it to be a good and smart investment.

Any help is greatly "appreciated" :)

Thanks!