Also, this house is oil heat. 

Cash from working on oil pipeline in Alaska What was the outcome?

I have an engineering background in the Oil & Gas Industry.

However watching the stock and oil markets for some time I was able jump on once-in-a-lifetime prices, and, with various forms of borrowed capital contributing, I’ve essentially gotten a 10x return to date on my own money, and expecting that might double again over the next year or two before I’ll call it played out and be ready to shift to something else. 

The building was originally heated with oil and the tanks and boilers remain.

"When life gives you lemons, make lemonade".How many layers or what layers could make this a good deal?

Heating is oil, so that is another $3000-5000 annual expense for oil alone.

Do you see it being prosperous despite the move away from oil and economic conditions? 

I think a lot of investors will make lemonade out of these lemons. 

While it goes without saying that finding deals is the most important aspect of the business my question would be what is the number one tool or system to have in place to sustain a well-oiled machine and business that could potentially be sold at a later point in time.