既存不適格
kizon futekikakuきぞんふてきかく
Existing nonconforming building
A building that was legal when built but violates current rules — over today's coverage ratio, or under today's seismic code. It may stand and be used as-is, but any rebuild must meet current law, often meaning a smaller replacement. Distinct from an illegal building (違法建築), which never complied.
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