There are a few specific issues:
On this task, are rather many objects where you see separating walls.  So, no roof. 
they seem (to me anyhow) not destroyed, war or earth shake, just under construction.
In a few occasions, you tagged each room of such an object as a building. Just map the outside.
Tag them as building= yes. Later on, by mappers on the ground, the correct tag will be placed.
Best regards and keep mapping
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