If you received rental income from your property during 2018 then you are required to file a South Carolina state return even if you have a net loss. According to the South Carolina Department of Revenue, if you are a nonresident or part-year resident, you are generally required to file a South Carolina return if you work in South Carolina or are receiving income from rental property, businesses, or other investments in South Carolina.
Please view the South Carolina link below for more information.
https://dor.sc.gov/tax/individual-income/faq