Hello. Thanks for mapping.
Unfortunately, your mappings are very poor and sloppy. Don't you use a mouse to map?
Please map more accurate and square the rectangular buildings with the Q key.

About mapping of high buildings. They show a large shadow.
Check here how high buildings ought to be mapped.
Many high buildings have a kind of 

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

Many tall buildings have a small building, a superstructure, lift building or something similar on the roof, do not map it as a separate building, just map the roof lines of the complete building.
Best regards