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The Horace Walker House, also known as Castillo Sebastian is a historic home in St. Augustine, Florida built around 1888. It is located at 33 Old Mission Avenue, near the north city gate. On January 30, 1998, it was added to the U.S. National Register of Historic Places. The structure was designed by Franklin W. Smith, who also constructed Villa Zorayda, his personal residence in St. Augustine, and the Casa Monica Hotel, which was sold to Henry Flagler.