I'm liking this one. Built in 1760 (older than my oldest building), and was the home of a signer of the Declaration of Independence.
https://www.realtor.com/realestatean...-19017?view=qv
Seriously though, there's nothing decent downtown that isn't in the seven figures.
(I wonder what the cap rate would be on Airbnb for a pre-Civil War $1M-$2M nice little house; I have started to operate my most luxurious building this way (all units) and it's really profitable compared to yearly rental, but it happens to be in an area where the zoning allows for hotels; not sure that would be true everywhere in downtown Charleston.)