Hello. Thanks for mapping. 
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 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.. 
The dark objects next to buildings to the west is the shadow the building give. Don't map it as a separate building.

Best regards and keep mapping 