A significant percentage of single-family and rowhouses in DC are older Preister's, the actually historic ones by about a century. My own house is a couple years newer than his, 1919 I think. I just put up solar panels without any NIMBY nonsense like this. My only regret is that the south-facing roof is in the rear, so it was not economical to plaster the north-facing front roof with panels and thus trigger any passing reactionaries.