On my lot where I live, I can have as many kitchens as I want (not sure why I would have extras) and can build a tower, but they won’t let me build an ADU for my mom unless it is connected to the main house.  

If I were in your position, I would buy a duplex that has potential for value add, fix it up, live in one unit and rent out the other unit as a medium term rental or long term rental.

What's the difference between co living and shared housing?

While none of us will be getting our money back he can live well selling off the remaining assets as long as they don't shut him down.

@Dexter Florendo Kalai AspacioBuy in the right location where people want to live and rents will continually increase.

Keep in mind that all this time we were living with my parents paying them rent but saving/starving to score our next deal. 

My husband family have lived in Oahu for several generations now.

We live in this area and it seemed like a great opportunity with the margins How did you find this deal and how did you negotiate it?

What is the service life on this piece of equipment.If it has capacitors the service life could be 10 years, or they may have a service life of more than that, but they don't live forever (what about repairs?).

I also have registered my "rental company" with the state of Maryland, where we live.