Buildings are often not correct mapped. Especial the high rise buildings and buildings which shows their sideviews  as well. Check this footage how to map these buildings 
https://www.youtube.com/watch?v=dsfUcslLtVc
https://drive.google.com/file/d/13RTwH7sChRWrG5bIjysF2ripBgh3F5l4/view?usp=sharing 

Best regards and keep mapping