What's the age of construction? Is this brand new construction? Has the building been around 30 years?
Do you have drawings for the building that show you how these different elements connect?
Honestly, there is little we can tell you about this crack without knowing more information. However, I can say the following:
a) It is pretty common for masonry elements to crack where they connect.... This is due to shrinkage in the longitudinal direction of these objects. Since the elements are restrained (i.e. connected to the foundation) it makes sense that the cracks get much, much smaller the closer you get to that restraint. Therefore, I wager that these are merely temperature / shrinkage cracks. I don't classify cracks they way you suggest. Though that may be a different between our countries and their building codes.
b) It's not possible to tell if this presents a "structural" problem without knowing more about the structure. Drawings, calculations, load paths, etc. We can make some assumptions. But, any conclusions would have a low degree of confidence. Honestly, we don't even know if these masonry elements are structural (they look structural to me) or merely cladding that hides the real structure underneath.
Personally, if this were a house that I were buying, I would not be scared away by these cracks. They are likely repairable. And, I doubt the cost would be all that great. However, you would still need a engineer (or at least an experienced inspector / contractor) to suggest an appropriate solution to the problem.