I co-borrowed on a house with my dad to buy his first home utilizing an FHA loan and now would like to buy my house.

I would suggest the expenses of operating an ADU are reasonably minimal, so let’s assume they are 15% of annual revenue (and tenant pays their own utilities).$1,500/month x 12 months = $18,000 annual ADU rental income$18,000 income – $2,700 expenses = $15,300 net annual revenue$15,300 net revenue / $100,000 investment = 15.3% annual return Two Bedroom (700sf)Lets assume the total cost of this unit is $225,000 ($321/sf) and the rent we can achieve for this nice, new 2 bedroom ADU is $3,000 per month.

You should make sure that probate is up to date on the utilities when you close for the house.

Also, it's unusual to have a multifamily where you don't pay for any garbage, mowing, plowing, or utilities. 

De facto this also includes the utility room, which is a separate room in the basement (the door does not lock). 

Currently, it is being occupied by a tenant who plans to move out at the end of the year.I am seriously considering venturing into Airbnb, however, I am an out-of-state investor and would need to utilize an Airbnb turnover and management service company in the area. 

Currently brings in just under $4k a month in rent with utilities paid by tenants.

-Lastly, what utilities do you tend to include in your property budgets?

Any feedback on which avenue to move down and how to better utilize the cash if selling is elected is greatly appreciated!

It is basically a grass path that hasn’t utilized in years and is very bumpy.