Hi there, welcome to OSM :)
I wanted to check what duplex here means: are the houses combined with a fire wall in between them or are they separate as in two single-family homes?
There's some more specific tagging that can be done if they're combined and I just want to check if such tagging would be valid here.

(the tagging I'm curious about is https://wiki.openstreetmap.org/wiki/Tag:building%3Dsemidetached_house if you want to read the description yourself)

Thanks :)