First, the apartment building was constructed.
An underground garage was being dug on the south side - the excavated dirt was piled to the north of the building.
It started raining heavily, the water seeped through the soil.
This created uneven lateral pressure from north to south. The building began to tilt. Then it began to shift, and the "hollow" concrete pilings were snapped due to the uneven lateral pressures.
This resulted in a lateral pressure of 3,000 tonnes, which was greater than what the un-reinforced pilings could tolerate. Thus, the building toppled completely over in a southerly direction.
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