Hello. Thanks for mapping on this project. 
We welcome you as a new mapper.
We cannot expect that a new mapper maps everything in according to the requirements. 
Here I show you where your mappings are not in line with the mapping standards.
1 Each rectangular building need to be squared with the Q key while selected.
2. Map no clustered buildings. Each building need to be mapped as an individual building.
3. Don't connect nodes of buildings to other objects (including buildings)
4, Where buildings show both a sidewall and the roof, map the roofline accurate and move the whole to its footprint on the ground, Don't include both roofline and walls (and shadow) in a mapping
Best regards and keep mapping.

