Thank you for posting your question on History Hub.
We performed a search in our online Catalog and found three digitized records on the Gaffney Commercial Historic District - https://catalog.archives.gov/id/118995923, https://catalog.archives.gov/id/118995754, and https://catalog.archives.gov/id/118995925
These records are from Record Group 79 - Records of the National Park Service in the National Register of Historic Places and National Historic Landmarks Program Records, 2013 - 2017 series.
There also appears to be additional records in the series "Final Grant Reports, 1951 - 1981" in Record Group 207 - General Records of the Department of Housing and Urban Development, 1931 - 2003. Please contact the National Archives at College Park at Archives2reference@nara.gov for more information on the records within the series and how to request copies. Please note that due to local COVID-19 guidelines, the staff may have limited or no access to records at this time.
We hope this information is helpful in your research.
The National Archives and Records Administration