Dreaming of building falling down is a bad sign as per dream meaning and interpretation. It associated with destruction, shattering of dreams and unexpected failure. You need to be extremely careful about all your actions after the dream of building falling down.
Dream of building falling down and if you know the building then it is a sign of career trouble or major accident at workplace or home.
Dream of unknown building falling down suggests accidents or you might be trapped by your enemies.
Dreaming of building falling down and you try to rescue people means you will witness a major accident and you will be helpless.
Dream of building falling down and you running is associated with problems to friends or family members.
Please note that the dream to have a meaning it should happen naturally and not after reading or seeing or hearing something about building falling down etc.