consider to edit with JOSM.  Here you can simply search the downloaded data.
https://wiki.openstreetmap.org/wiki/JOSM/Search_function

owerpass.turbo may also work for you:

https://overpass-turbo.eu/s/1t37
(click the execute button)

simple 3d buildings:
https://wiki.openstreetmap.org/wiki/JOSM/Search_function

please note that most of the buildings I have edited here are not correct by that standard. Also the heights are only estimated by the shadows. You can bring in your local knowledge here.