Nakagin Capsule Tower: a building and its surviving units

The building and its units

Two cores provided structural, circulation and service functions, with 140 capsules attached around them. Units combined sleeping, work, storage and bathroom facilities for small dwellings or offices. Marketed partly to businesspeople commuting to Tokyo, they differed from short-stay sleeping compartments in capsule hotels.

Prefabrication and assembly

Tomohiro Fujisawa of Kurokawa’s office describes the assembly: furnishings and equipment were installed in the capsules at the factory, then the units travelled by trailer and were hoisted by crane. Four bolts attached each capsule to a concrete core. A prefabricated private room thus depended on a separate building structure.

Metabolism and Expo experiments

The Metabolist manifesto of 1960 imagined buildings and cities as systems capable of growth and renewal amid postwar reconstruction and rapid urban change. Expo ’70 offered a testing ground: Kurokawa suspended dwelling capsules from a space frame and inserted capsules into the Takara Beautilion’s framework. Completed in 1972, Nakagin brought this period’s experiments with units into urban housing.

The replacement concept

Capsule architecture related to Metabolist ideas of buildings and cities changing with society. The capsules were designed for replacement, although this did not become a routine part of the tower’s use. Residents adapted interiors to work, collections and daily life, giving the building histories beyond its initial marketing.

Practical maintenance problems

Detachability did not make maintenance straightforward. Fujisawa reports that refurbishment and asbestos-removal schemes proposed from around 2000 required all 140 units to be removed; resident agreement and construction conditions did not align. During later capsule conservation, stripping interiors revealed deterioration in steel members and holes at connections. A removable joint could not by itself resolve building-wide maintenance and coordination.

The preservation and restoration project began in 2014. When the building was dismantled in 2022, the project worked with Kurokawa’s office to remove and restore twenty-three capsules. This is the project’s tally, rather than a worldwide inventory of surviving units.

MoMA acquired capsule A1305 in 2023. Restored in 2022–2023, it incorporates original fittings salvaged from other rescued units, including optional audio equipment. Its museum interior therefore combines material from more than one original capsule.