We don't know if the symmetrical, double-front-porch-style Victorian cottage shown here was originally built as a duplex, but in some parts of the country this porch style is fairly common.
The use of Brackets on either side of 'clipped' front corners, Half Posts where railing meets a wall, and Newel Posts on either side of the porch steps are all standard features on Victorian homes from this period.
Ever popular Wisteria Spandrels between Sun Ray Spandrel Brackets draw attention to this charming business.