Hey MxxCon, thanks for the info. (This was my very first time dealing with large/complicated apartments. I only started OSM a few weeks ago!)

Hmm...

- - -

If you look at on-the-ground footage, you can see each inner corner having:

- big doors (facing the main street) marking each set of address numbers.

Like:

- https://www.google.com/maps/@40.6651915,-74.1159954,3a,84.2y,44.64h,91.06t/data=!3m7!1e1!3m5!1skDnZJaCIx6ENLRxjn1_WtQ!2e0!6shttps:%2F%2Fstreetviewpixels-pa.googleapis.com%2Fv1%2Fthumbnail%3Fpanoid%3DkDnZJaCIx6ENLRxjn1_WtQ%26cb_client%3Dmaps_sv.tactile.gps%26w%3D203%26h%3D100%26yaw%3D110.254974%26pitch%3D0%26thumbfov%3D100!7i16384!8i8192?entry=ttu
- https://www.google.com/maps/@40.6658765,-74.114894,3a,90y,214.38h,73.23t/data=!3m7!1e1!3m5!1sUUX-Pobpv7bRN8hq62XaKg!2e0!6shttps:%2F%2Fstreetviewpixels-pa.googleapis.com%2Fv1%2Fthumbnail%3Fpanoid%3DUUX-Pobpv7bRN8hq62XaKg%26cb_client%3Dmaps_sv.tactile.gps%26w%3D203%26h%3D100%26yaw%3D94.61627%26pitch%3D0%26thumbfov%3D100!7i16384!8i8192?entry=ttu

Knowing that... I'm unsure how those "+" shaped buildings should be divided.

I think:

- chopping them into evenly distributed '+' signs

might work in this specific case... but I'm completely unsure how to do that in OSM currently.