Regarding this building, corner Octavio Vargas/Francisco Bascur, I have not touched the outline of that building. I might have moved the whole square. But it was like this before. I then only added the bakery node and updated the node of the hostal. Because the resolution of the aerial imagery is really bad at the needed zoom level, I can't really say, where one house ends, and another begins. I know, it is one property and somehow everything is covered somehow. 
I would leave it as it is, because really it isn't that important. 
That's also the reason, I avoid adding any housing in the squares. One just can't say what is what, where one house starts, another addition begins, and so on. 