This was posted on February but got no attention until yesterday, when these guys found it. And while it may have been staged, I have no problem believing it—there have been many similar cases of rotten or fragile buildings falling under minimal vibration.
Most probably these guys were just walking by and noticed how the building was in a very precarious situation. And the weight of all that snow certainly helped.
Here's a good example of another building going down with some vibration in Ashton-under-Lyne, England:
And the newspapers are full of stories of similar accidental collapses, some for no apparent reasons. Here's one apparently caught in Russia at a wedding celebration (not a good omen.)
Or this building in India. Or this one in the Philippines:
Got more? Post your videos in the comments.