Unless you need aggravation.

They are much less aggravating/ management intensive/ depressing to own, and provide much higher overall returns over time thanks to less churn and way more rent and value appreciation.

They did give you info that they love your place, plan to stay forever, and accordingly you should increase the rent $250 per month if allowed by your local laws for the aggravation of dealing with them. 

He would tell you the moving expenses and the aggravation are not worth it.

itay Not worth the aggravation.

Arrrggggg, learning has its aggravations. 

By the time I got out of it I lost quite a bit but I was happy to free myself of the aggravation of doing business with these people. 

You might as well buy the new Benz for them now and safe yourself the hassle and aggravation.

If your intent is to keep this a two unit I would separate the utilities it will likely save you money and aggravation in the future.

That been said, if your return is not substantial, it's probably not worth your time and money (and some aggravation).2.