To dream that you collapse represents waking life feelings about something being too much for you. You may feel that you’ve reached the end point of tolerance, patience, or persistence.
To dream of seeing a building collapse represents outdated ideas, perspectives, or situations. Ideas or beliefs that are no longer powerful. An accumulation of pressure, stress, or opposition that’s too much to continue with certain situations or beliefs.
Negatively, a building collapsing may also reflect deceptions that are too weak to resist the increasing power of the truth.