^ and some of the rowhouses from that 19th century example have parking off the alley in back as well:
https://www.google.com/maps/@41.8699.../data=!3m1!1e3
so are the units in that old 19th cenury row that have added parking in back now more accurately described as "townhouses", while the units immediately adjacent to them that have not turned their backyards into off-street parking should still be called "rowhouses"?
as i said earlier, very blurry lines in the middle.