Tenement

The load bearing walls act as a stiff box
The weakest points in this box are the openings for doors and windows and the junction between the wall and slab

However the most serious damage has occured when diagonal cracks appear in the walls themselves, they should be checked by an engineer immediately.

Cracks are most likely to appear at the corner of openings diagonally. The shorter these cracks are, the less damage has occured. These will need repair but are not risky.

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