Hi I'm here to review your changeset. 

First, the vast majority if not all of these buildings represent buildings. 

Some of the buildings could have been more accurately mapped: exclude the shadow a building casts on the ground when using the roof to draw its footprint. You didn't square the footpritns `q`, though on some buildings this was really no issue at all since you placed the nodes accurately so I only had to square them.

You can see how I mapped here in https://osmcha.org/changesets/172261246

Thank you for your contribution. If you want to experience the OSM community or to get timely feedback from other mappers; I recommend that you attend a mapathon. You can find events here https://osmcal.org/