Treviso Italy Liebherr 63 on what appears to be a factory cross base. Counterweights are present, yet the crane tipped and landed in the roof of a house. In the world of tower cranes this is a tiny crane and so the house was able to stop the fall. Unfortunately I don't speak any Italian so the pictures and video were as far as I could get in terms of knowledge.
Three posibilities are immediately obvious. The crane wasn't erected plumb. The soils weren't checked, or it lacked the proper amount of counter weight. Without more information available, that's the best that I got for ya.
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