Downtown Charleston, SC Real Estate Listings Under $350,000 For Sale | Homes for sale under $350000 Downtown Charleston. Properties under three hundred thousand in historic downtown Charleston South Carolina are rare, and for that reason I have put all the listings on MLS for real estate below $350,000 here. Because homes for sale in historic downtown Charleston SC is the most expensive property in all of South Carolina finding an affordable home is almost impossible, so anything below $350,000 will certainly be a tiny condo.