Has anyone heard of the 26% rule?

[Ryan Pemberton]

Has anyone every heard of analyzing a rental property by taking 26% (or 74% of the monthly rent) off the monthly rent and multiplying by 60 months to come up with an offer price?

Ex:  $500/mo rent x 74%

$370 x 60 = $22,200 offer price.

I think it might be a good rule of thumb but it seems a little black and white for analyzing every deal.  Specifically, I'm looking at some properties that the owner is renting way below market price...so using these analytics makes the offer prices crazy low.  Like...less than half of retail..

Any insight would be awesome!

Thanks!