The Aeropolis 2001 is a proposed 500-story high-rise building over Tokyo Bay in Japan, envisioned by Obayashi Corporation.

With a height of 2,001 metres (6,565 ft), the mammoth structure would have been approximately five times as tall as the former World Trade Center in New York City.

The Aeropolis 2001 was proposed in 1989, amid a spate of similar projects for incredibly large buildings.

According to a 1995 article, the corporation still had plans for the structure, and gave a proposed height of 2,079 metres (6,821 ft).

Newspapers reported that plans called for the building to have 500 floors accommodating over 300,000 working inhabitants and 140,000 live-in residents.