I asked a physicist at the university about it and he said that it could be caused by tectonic plate shifting or a slight change in the tilt of earth's axis. Either could cause planetary climate change.
Hon, that was no physicist. LOL. There is no observable changes for THAT building regarding the exposure to sunlight on the north face of a building. If you are in Northern Michigan, the bottom of the north side of that building will never see sunlight (in our lifetimes). If you are in Panama, the shadows will move with the seasons and may shine on all sides of the building (near equator). . Humans figured this out 10,000+ years ago and invented a sundial to actually scientifically track that daily and seasonal event. LOL
Sorry, but you are mistaken. He was a world renowned physicist
My obersvations were accurate and his answer made sense.