Hello Gregory. 
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. Than you find hardly buildings in th northern part.
You can double check it with an external earth map (G*) 
Use in JOSM  Ctr+J , copy  Latitude and past it in the (G*) search field. add a space and repeat the copy /past on the longitue value.
Click the find option.  Now you see the most recent imagery.  You can use the time line to see historical data.  It is helpful, centainly when the ESRI imagery is not that clear.
Best regards