The design of the Fireproof Building (c. 1825) has been attributed to Robert Mills based on a drawing by him. Mills executed the design in a more monumental style. However, Mills's drawing reveals a more delicate Regency building than any he ever built before or since and recalls instead Jay's work in Savannah. Although Mills never refers to Jay in any of his papers, in 1821 Mills succeeded Jay as architect to the South Carolina Board of Public Works and inherited a number of unexecuted public building designs left behind by Jay.