Scarlet Oaks
... that Cincinnati's Scarlet Oaks was once the only known extant house designed by James Keys Wilson?
... that <a href="./Cincinnati" id="mw3g" rel="mw:WikiLink" title="Cincinnati">Cincinnati</a>'s <b id="mw3w"><a href="./Scarlet_Oaks" id="mw4A" rel="mw:WikiLink" title="Scarlet Oaks">Scarlet Oaks</a></b> was once the only known extant house designed by <a href="./James_Keys_Wilson" id="mw4Q" rel="mw:WikiLink" title="James Keys Wilson">James Keys Wilson</a>?