S.C. Code Ann. § 12-37-940

The following articles of personal property shall be valued for taxation, as follows, to wit: leasehold estates held for any definite term, at the yearly value thereof to the lessee; annuities, at the yearly value thereof to the owner at the time of listing; and leasehold estates held on perpetual lease or for a term certain renewable forever at the option of the lessee, at the full value of the land.