Thanks for mapping on this project.
A remark. On this location, it is hard to identify buildings. What helps, is to switch between Bing an Esri world Imagery. Then you hardly find buildings in the northern part.
You can double-check it with an external earth map (G*)
Use in JOSM Ctr+J , copy Latitude and paste it in the (G*) search field. Add a space and repeat the copy /past on the longitude value.
Click the find option. Now you see the most recent imagery. You can use the timeline to see historical data. It is helpful, certainly when the ESRI imagery is not that clear.
Best regards