Hello. Thanks for mapping. 
This task is invalidated.
A remark about the way high rise or multi-story buildings have to be mapped 
On the imagery, you see both the roof and a sidewall (with multiple floors) 
The imagery is taken under a certain degree and shows so you see the height of a building as well.
Don't map both the roof and the sidewalls as 1 building.
Draw just the rooflines as a building and move it to the building's footprint.
See this clip.
https://drive.google.com/file/d/1V5-bADsYiffCD9bo6l64YOdTvmKqMGry/view?usp=sharing

Another issue.  All rectangular buildings need to be squared , ( Qkey while selected)

Best regards and keep mapping