You could donate it to Habitat for Humanity or try to sell it to the neighbors.

In my view it would be very difficult to live off investment cash flow given the incredibly high health and insurance costs you'd incur when you get old.

So even though they are different systems to put with your "software toolkit", they need to make sense from a human resource standpoint.  

You're probably looking at 40%ish of that profit going to taxes including ordinary income fed and state, Affordable health care Act surcharge, and self employment taxes.

After leaving engineering to attend business school in Philadelphia, I opened a health club in downtown Philly.

His health has taken somewhat of a toll on him but his son fully manages them to keep the money in the family, which is an added bonus.

My background is in business management/operations, and human resources.

Buy a subway, pay franchise fees and taxes and a mortgage and employees and social security and welfare tax and have to pass health code inspections and pay for supplies you may or may not be able to sell and pay insurance and the list could go on forever. 

Then (hopefully in 5 years) when we make what the higher earner makes in a year (factoring in health care and other add on costs) the other quits to focus full time.

I work full time as a corporate sales rep and also have a health and fitness/coaching business on the side.