First commercial property help

[Austin James]

okay so I have flipped one home that was easy I needed to buy my home for X and rehab for X and sell for X to profit X.

This new opportunity came across for me and I just don’t know how to make it pencil.

Building is 

$150,000

Rents right now for 800 which I think is atleast 200 to low. 

If I can’t make my mortgage on it 799 a month and it rents for 800 that’s a positive venture right? 

Also do commercial loans go 30 years?