I don't see how this is significant...? So 1.9% of 0.6% of non-residential buildings have PV. Okay, so what? Warehouses, gas stations, parking lots, apartments, campuses... solar is everywhere. Why is it notable that a tiny minority of HoW also have PV? Even if they accounted for, say 3% of all non-residential PV... still, so what?

(Not directed at you, parent poster, just wondering out loud. Like I don't get why this was a study at all, much less what the results signify...)