Photo taken in Tokyo's Ginza area on April 12, 2022, shows Nakagin Capsule Tower, the world's first capsule-style architectural building put to practical use, designed by renowned Japanese architect Kisho Kurokawa and completed in 1972. Work to dismantle the building due to aging began the same day. (Kyodo) ==Kyodo

Demolition work began Tuesday on architect Kisho Kurokawa's Nakagin Capsule Tower in Tokyo, an experimental housing block that had fallen into disrepair since its completion 50 years ago.

The iconic structure in the capital's Ginza district symbolized the "metabolism" concept promoted by the late Kurokawa and other architects that called for a metropolis to be a living organism. The tower's 140 capsule units were originally intended to be replaced every 25 years, but this idea did not materialize.

Built around two central cores, each capsule is secured to the structure using four high-tension bolts to make it easily removable and attachable. Each capsule has a space of around 10 square meters, outfitted with furnishings and appliances.

The demolition work is expected to be completed later this year, with some of the capsule units expected to be reused in accommodation facilities and other projects.

Nakagin Capsule Tower, completed in 1972, has attracted global attention as a work of the renowned architect, who also designed Kuala Lumpur International Airport in Malaysia and the New Wing of the Van Gogh Museum in Amsterdam.

Until the coronavirus pandemic, it was common to see foreign tourists taking photos outside the capsule tower building.

The site's sale was announced in the spring of 2021 to a real estate firm with plans to demolish the property and construct a new building on the land. Work began once the residents had vacated the premises last month.

"There is sadness, but I'm looking forward to seeing how the removed capsules will be reused," said Tatsuyuki Maeda, who owned more than 10 capsules in the complex and heads a group of former apartment owners at the tower calling for the preservation and regeneration of the capsules.