S.C. Code Ann. § 39-14-20
As used in this chapter:
(3) "Just compensation" means the cash payment of the fair market value of the off-premises outdoor advertising sign in place immediately before its removal and without consideration of the effect of the ordinance or a diminution in value caused by the ordinance requiring its removal. The Uniform Standards of Professional Appraisal Practices (USPAP) must be used in determining the fair market value for just compensation and includes the following factors: