The present invention provides a design structure of an apartment building in which a plurality of unit two-story houses, each being formed by integrating two floors including an upstairs floor (UF) and a downstairs floor (DF) into one unit house, are repeatedly arranged in the vertical and horizontal directions, wherein each unit house has a living room disposed on the upstairs floor (UF) and a plurality of bed rooms disposed on the downstairs floor (DF), a slab (S2) for partitioning each unit house into the upstairs floor (UF) and the downstairs floor (DF) is spaced a predetermined distance apart from a slab (S1) of each adjacent unit house, a sound absorption wall (100) capable of absorbing sound and having a height corresponding to the slab (S2) is installed in the space between the slabs (S1, S2), and sound absorption plates (100a) are installed on the upper and lower sides of the sound absorption wall (100) such that each of the sound absorption plates (100a) extends a predetermined distance from one end of the slab (S2).
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