This 13 floor Chungdamdong 00 apartment was extended with elevators going underground to 2 more floors. The original planning for this was to support 16 floors with 6of the micro pile 65 and drilling. However, when it came time for drilling, it was revealed that the micro pile could not support the building with its original method.
Reconstruction due to non-fixation issue of the micro pile
After underground elevator remodeling