So, I tucked my tail pretty ashamed and have been re-evaluating my numbers ever since.

I am evaluating a residential rental property and the owner, who has a business separate from the rentals, apparently leases a building on the property (not a rental unit), out to himself for an office for his other business, (this building could be rented out as an office so he is not calling it something that its not). 

If it makes sense I'll evaluate using docusign in the future though. 

I'm very fond of Excel, like @John Warren, but only for certain things, like evaluation of acquisitions, calculating cost and benefits of different loan structures, and projecting cashflow. 

So, I would evaluate that option in some detail before deciding to put in a second meter.

Joe, I really appreciate your quotes/beliefs, they really made me evaluate my current mindset.

Save as much as possible and do the evaluations on properties every day. 

Greetings,I am using the BP Rental Calculator help me evaluate potential rental properties, and attempting to be as accurate as possible. 

You have to figure that into your deal evaluation, because a property that cash flows this year may not next year. 

Back of the napkin is good for seeing if something is just not worth your time, but you need hard data to really evaluate any deal, Turnkey or otherwise.