Currently separate outside stairs to second floor.Most of the house he has looked at they would leave all of the furniture, lawnmowers and tractor.  

., but most investment was in updating furniture, appliances, etc. for guests.

You risk some money on furniture (which you can resell if it doesn't work out) and vacancy time.

If you want as little hands-on as possible, turnkey is obviously the way to go BUT you can still sell/get rid of furniture you don't like and make some small changes.

We have designed  our homes furniture-friendly and have more functionally. 

If the hesitation is around investing in all the furniture and decor, then MTRs might not be right for you. 

In my experience with nice finishes and nice furniture it will bring in $80-100k in rental revenue. 

(This which would be things like furniture or anything else that would fall out if you turned the house upside down and shook it.)

Would NOT recommend using any type of standard lease though as they are not meant to address your planned co-living arrangement.Some issues not usually in a standard lease you would want to address:1) Overnight guests2) Parking3) Utilities4) Sharing of common areas and do you want any areas off limits.5) Guests & parties6) Use of and damages to your furniture, etc.Also, how will you secure your personal bedroom and other possessions?

The vast majority of the homes in the area have not been updated and are using older furniture etc.