Hello. Thanks for mapping.
Check here how high buildings ought to be mapped.

https://docs.google.com/document/d/1z7uDwYm4oNmlexHIhJxGCjPpNhCQAgRia5aEJr_4MwM/edit?usp=sharing

You can also load the mapbox imagery for this project 18571. this image is showing the area from straight above. 
Check the alignment to the other imagery first.
It shows the buildings hidden in the shadow as well.

Best regards and keep mapping 

