Converting to up/down duplex - Need help with basement stairs

[Logan Hughes]

I’m looking at purchasing a home with 3/2 upstairs and 2/1 downstairs. Each level has a separate entrance, kitchen and living area.

The plan would be for me and my wife to live downstairs and rent the top level. The only issue is the stair case. It does not have a door and I can not figure out how to split the two levels while complying with codes (Georgia).

What would you recommend for creating separation between the two levels?