Just because all the tenants have Sec 8 vouchers doesn't mean much about the building.Can you get a title report to see if there is a LURA (land use restriction agreement) against title? 

Here if you’re outside the city and there’s no CCRs restricting it you could do multiple on one lot and it would be like a multi family property if you wanted to rent them out.

Similar is with  restrictions for renting Airbnb.

Remember some builders have restrictions on renting while they're still building, they may prohibit signs, etc.

I’m looking to refinance my owner occupied property (it’s a duplex) and I’m bumping against the 75% LTV restriction for cash out on a multi family. the only other route is FHA which allows up to 80% but has a PMI.

Keeping a good tenant is golden and the possibility of them leaving from any increase and having a vacancy defeats the rent increase you impose.

@Sophia Remley, it's always important to know the laws of your state and your town, as the town may have more restrictive laws than the state. 

@Aaron Alsup The banks generally do not have lower loan amount restrictions.

The comment about supply not catching up to demand was as much about the restrictive and lengthy entitlement process as it was about the diverse and robust employers in the area in a variety of sectors.

Hey Anthony,First off you need to make sure the area you plan to add the ADU in has no zoning restrictions or CC&Rs (covenant codes and restrictions) as this can put an immediate halt to your progress.