IANAS, but for a building as old as yours I'd expect it to have come to terms with it's local environment, so for settling that induces cracks the size of the ones you posted I'd be looking for something recently introduced, or recently stopped - a longterm water leak that has been dealt with can result in this sort of thing (as my parents experienced).
IANAS, but for a building as old as yours I'd expect it to have come to terms with it's local environment, so for settling that induces cracks the size of the ones you posted I'd be looking for something recently introduced, or recently stopped - a longterm water leak that has been dealt with can result in this sort of thing (as my parents experienced).