@Phil SheltonYou would need a civil engineer to provide a drawing to get submitted to zoning and get a permit if it passes zoning is most common This also depends on the road - if it’s a state road forget it as it will take a year to get approved and cost a fortune - if it’s a local road process not as cumbersome but don’t expect this to happen quicklyIn some instances you may have to prepare sight distances etc to make sure it’s safe to add a curb cut

The location is ideal, as it’s situated in a neighborhood that permits short-term rentals (STRs), making it a great investment opportunity.

Just make sure the town is ok with the land being zoned for multi-units, and look into construction costs, financing options, and permits ahead of time.

Duplex have different zoning that may permit additional units.

Basically, "wholesaling" is no longer permitted. 

Trouble with cities on permits?

If you have a D property in an A neighborhood, then it's likely vacant and ripe for rehab, or already purchased and awaiting permits for rehab (or tear down).

Since you can’t do a formal inspection, a detailed contractor walk-through and phased renovation estimate are key.Have you considered checking city records for past permits to uncover any unaddressed issues?

I will for sure get the ADU permitted.

However, I will always contact the owner as soon as time permits.