Low down payment (3.5%) is attractive, but comes with mortgage insurance and might not offer the best rates.

These are all services that investors and homeowners will and do pay for so you're on the right track.

Compare this to your total monthly costs, including mortgage, insurance, taxes, vacancy and maintenance.

You should go through an RMLO if it is a homeowner who will live there.You are doing a wrap loan.

We have trades we use on jobs and know what they will charge which is often considerably less than what Joe Homeowner would pay for the same job . . . the trades know we will be using them again and again. 

Option 1 - NOI = Rent - (maintenance, vacancy, management, property tax, insurance)or Option 2NOI = Rent - (property tax, insurance)in both cases i assume DSCR = monthly payment/NOI

(You know you’re on the right track and you insure future leases end between March and July by varying the length of the new lease.)Good luck. 

Use STR-specific insurance to protect both parties and automate operations with platforms like Airbnb, TurnoverBnB, and PriceLabs.Taxable income from the STR must be reported, but you can deduct related expenses like cleaning, utilities, and furnishings.

You will have to gather more accurate operating costs (vacancy loss, taxes, utilities, insurance, mgmt fees, maintenance, HOA) to best determine potential future performance.

One report I saw said that something like 80% of the ADUs built were to house parents/children of the homeowner and were not being rented out.