Twin Tree Tower is located southeast of Gyeongbokgung. It is a couple of 17 floor above ground and 8 floor below ground office buildings designed by BCHO Architects ( Byoung Soo Cho Architects http://www.bchoarchitects.com/index.html ). Completed in 2012, it is one of very few designed office buildings in Seoul. The overall form of the buildings are referenced from an old birch tree trunk. V shapes mimic the tree cracks and breaks down the mass. This makes the building geometrically and spatially more interesting and not too heavy.