The closest visitors parking would be M deck, I believe about $7 per day. If it's closed for visitors (not this semester thought, but usually on Tuesdays and Thursdays) then park at N deck. Unfortunately there is no free parking in the area, but you can stand for a bit near grady if someone is in the car.
Good Morning Mimi and sorry for the late response. Check out https://parking.gsu.edu for any parking related questions.
Thanks! Your answer is awaiting moderation.