The Elsa Tower 55 (エルザタワー55, Eruza Tawā Fifutiifaibu) is a residential skyscraper located in Kawaguchi, Saitama Prefecture, Japan.

Completed in 1998, it stands at 186 m (610 ft) tall.

It was the tallest residential building in Japan until 2004, when Acty Shiodome overtook it.

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