Townhouses for Sale Downtown Charleston, SC | Downtown Charleston SC townhomes for sale | Listings MLS.?Property in the downtown historic area of Charleston SC is the most expensive real estate per sq foot in the entire state of S.C. Kiawah Island would be a very close second. With that said many people looking to purchase homes who want to also live in downtown but don’t want to spend too much find that townhouses and condos are the most economical ways. Many are also in search of waterfront condos downtown Charleston SC.?