
Hello. Thanks for mapping on this difficult task.
Mapping of tall (high) buildings.  

Mapping of tall buildings differs from standard buildings. Because the imagery is taken at an angle, you see both the roof lines and also the side of a building. 
How do you map such a building?
Map over the roof lines and lastly slide the mapped building to the footprint.
Here is a video how that is done.

https://drive.google.com/file/d/1V5-bADsYiffCD9bo6l64YOdTvmKqMGry/view?usp=share_link

And.... don't forget to square each rectangular building.

Please map each building separately. Do not custer buildings.

Best regards and keep mapping
