Building I designed for a small non-railroad industry on my train layout.
The building and windows should print fine in the orientation shown. You might need supports for the building window openings, depending on your printer.
I have found I get best results on this style of roof by printing it vertically with a 15mm brim for stability. This eliminates the amount of supports needed if you were to print it flat, meaning you'll have a smoother texture on the underside from no support clean up.
There's a flat-roof version of this model at: https://www.thingiverse.com/thing:4048266