Housing Complex Niigata III is an apartment building composed of 34 dwellings. We tried to reconstruct the relationship between inside and outside spaces in collective housing in an urbanized, high density context. We designed considering the separating role of the perimeter wall, the slab and structural frame, and the use of a terrace as a transition zone. In recent years, with rebuilding progressing and old buildings in this area being lost, we envisage this structure as archival architecture, inheriting fragments of the historical cityscape and expressing memories in the future.