Hello. Thanks for mapping here.
Unfortunately, many buildings are not aligned to their footprint or incorrect mapped.

About mapping of high buildings.  They show a large shadow.
Difficult area to map.
Big building blocks with several stories and courtyards

Check here how high buildings ought to be mapped.

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

Many tall buildings have a small rooftop 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 and move the whole to the footprint. You can often see it in the shadow.
On this webpage you can see your mapping (east side ) and the modifications I had to made.
Best regards and keep mapping 

