Was the issue fixed?

Duplex have different zoning that may permit additional units.

I would not call myself an excellent GC, but I can pull permits, manage construction draws, and do the necessary things to be the contractor.

Does anyone know if you need permits to finish out a basement in Cobb County?

What steps do I need to take or issues I should look out for if I end up accepting a tenant and their voucher?

Get a new home inspection done to identify any serious issues.

Lets say the investor didn't use credit or anything related to credit metrics to buy the property (maybe own cash, OPM or HL, by the time the "refinance" part kicks is, what happens if the owner has credit issues and the financial institution won't proceed?

Timing or not, I wouldn't sign a lease in my personal name, you have little to no protection in the event there is a liability issue - ie grandma slips on the sidewalk - under LLC they have to sue the LLC if that's where property is owned and the lease is drawn. if it's owned personally they can sue you and everything you you have. bottom line is I say delay and get an LLC but that's just me

It's important to ensure compliance with local tax laws and regulations to avoid any potential issues.

When they are late, I follow strict protocol, I issue a late notice immediately, then after 5 days a 10 day pay or quit.