Hi! Another friendly tip, please don't draw according to the roof of the building, but rather their actual position. In this case, the imagery is highly tilted, which made the roof move away from the actual position of the building, which made you draw the buildings on the roads, which of course is not the case. Try to finish building on the roof and then selecting the building, clicking M, which is used for moving elements. You can then move them to their actual position. You also do not press Q to square the buildings, which is okay if you don't want to, but is sad, because it's such an easy thing to do and makes the data a hundred times better.