List of tallest structures envisioned for Tokyo explained

Tokyo is the most populated of Japan's 47 prefectures. With around 14 million inhabitants in the prefecture and 40 million in the Metropolitan area as of 2024,^{[1] [2]} Tokyo ranks among the largest metropolises in the world. Despite Japan being the country with the highest average age globally in 2024 (excluding the city-state of Monaco and Saint Pierre and Miquelon), according to The World Factbook,^[3] and experiencing negative population growth,^[4] the country underwent a period of rapid population growth after World War II,^[5] particularly in the capital, Tokyo. This growth gave rise to several megaprojects aimed at addressing ecological issues and space shortages caused by overpopulation.^[6] This article lists visionary megaprojects announced during the 1980s and 1990s, coinciding with Japan's asset price bubble period, as well as more recent projects with heights of 300 meters or more.

Tallest visionary structures

This table lists visionary construction projects, also referred to as 'visions' by the Council on Tall Buildings and Urban Habitat (CTBUH), with heights of at least 300 meters (984 feet).

Name	Height m (ft)	Floors	Start	Finish	Location(Ward)	Notes
Tokyo Tower of Babel	10 km	1969	—	—	—	Structure type: arcology
X-SEED 4000	4000	800	—	—	—	Structure type: arcology^[7]
TRY-2004	2004	400	—	—	—	^[8]
Aeropolis 2001	2001	500	—	—	—	Structure type: skyscraper /arcology^[9]
Sky Mile Tower	1700	—	—	2045	—	^[10]
M.O.T.H.E.R.	1321	220	—	—	—	Structure type: arcology^[11]
The Spiral	1000	200	—	—	—	^[12]
Sky City 1000	1000	196	—	—	—	Structure type: arcology^[13]
Hyper Building	1000	—	—	—	—	^[14]
Millenium Tower	840	180	—	2009	—	^[15]
DIB-200	800	200	—	—	—	^[16] ^[17]
Holonic Tower	600	120	—	—	—	^[18]
Shimizu Super High Rise	550	—	—	—	—	^[19]
W350	350	70	—	2041	Chiyoda	Research project that aims to make wooden supertall skyscrapers possible by 2041^[20] ^[21] ^[22]

See also

• List of visionary tall buildings and structures
• List of tallest structures in Tokyo
• List of tallest structures in Japan

References

1. Web site: 東京都の人口（推計）東京都の統計 . www.toukei.metro.tokyo.lg.jp . 2024-11-09.
2. Web site: Major Agglomerations of the World - Population Statistics and Maps . 2024-11-09 . www.citypopulation.de.
3. Web site: Median age Comparison - The World Factbook . 2024-11-09 . www.cia.gov.
4. Web site: Japan Population (2024) - Worldometer . 2024-11-09 . www.worldometers.info . en.
5. Book: Homei, Aya . 2016 . Wittner . David G . Brown . Philip C . Science, Technology, and Medicine in the Modern Japanese Empire . The Science of Population and Birth Control in Post-War Japan . NBK 402326 . New York . Routledge. 978-1-138-90533-7. 28080009 . https://www.ncbi.nlm.nih.gov/books/NBK402326/pdf/Bookshelf_NBK402326.pdf . 2024-11-30.
6. Web site: Tokyo Tower of Babel: World's Tallest Building Ever Planned . Malevus . November 9, 2024.
7. Web site: X-SEED 4000 . October 25, 2024 . Skyscraper Source Media.
8. Web site: TRY-2004 . October 25, 2024 . Skyscraper Source Media.
9. Web site: Aeropolis 2001 . October 25, 2024 . Skyscraper Source Media.
10. Web site: Sky Mile Tower . October 25, 2024 . Skyscraper Source Media.
11. Web site: M.O.T.H.E.R. . October 25, 2024 . Skyscraper Source Media.
12. Web site: The Spiral . October 25, 2024 . Skyscraper Source Media.
13. Web site: Sky City 1000 . October 25, 2024 . Skyscraper Source Media.
14. Web site: Hyper Building . October 25, 2024 . Skyscraper Source Media.
15. Web site: Millenium Tower . October 25, 2024 . Skyscraper Source Media.
16. Web site: Dynamic Intelligent Building . October 25, 2024 . Skyscraper Source Media.
17. Web site: Dynamic Intelligent Building . October 25, 2024 . CTBUH.
18. Web site: Holonic Tower . October 25, 2024 . Skyscraper Source Media.
19. Web site: Shimizu Super High Rise . October 25, 2024 . Skyscraper Source Media.
20. Web site: Wooden skyscraper will transform city into forest . 25 May 2024 . en.
21. Web site: 15 May 2023 . "Promote demand for wood in low-rise buildings" says architect of timber supertall concept . en.
22. Web site: September 2020 . W350 - The Roadmap Of Super High-Rise Timber Building . en.