The building that was referenced with regard to the real estate site is NOT the house that Celina lives in. It is the building next door that is a Rooming House. While I do not know for certain that the building was originally a schoolhouse, it does look like one.
The house that Celina and her family live in is the victorian style home next door and appears to only be a home that may have been split up into multiple apartments, with Celina's family having at least part of the 1st floor and the basement. I mentioned upthread that I can only find one other individual, outside of immediate family, that lists that address as their own. She is a friend to Celina and her siblings on FB and appears to be young, but an adult.
I posted photos of the home upthread and can post a photo of the rooming house too, if that will helpt to alleviate confusion.
It appears, from spending lots of time on Google Street View, that many of the homes in this small town, at least in the main part of town, are older victorian style homes and many appear to be divided into multi-family dwellings, either officially with separate entrances or unoffically with just the main entrance.