Back of the Napkin Calculator?

[Roman Rosario]

Guys/Gals...I'm about to write my next blog and share with my readers my back of the napkin calculator for commercial real estate. Over my 8 years at a national investment firm I found out very quickly that each investor had his/her quick sniff test using simple math.

My question is this, do you have a favorite back of the napkin that you use? I'll share mine if you ask for it but I'd love to see what others are doing as they evaluate real estate to see if it passes the 'sniff test'.....thanks in advance!