The Van Horn Building is a historic commercial building on the public square in central Carrollton, Ohio, United States. Constructed in the 1820s and greatly modified fifty years later, it has been named a historic site.James Sinclair bought land on the northwestern quadrant of Carrollton's public square in 1828. Although he began to erect the present building in the following year, construction proceeded slowly; the resulting structure did not open for business until 1842.