Why OOTEMORI matters.
OOTEMORI is a subterranean commercial complex where Otemachi's corporate character meets daylight-filled underground architecture, direct subway circulation and a woodland conceived as an extension of the spaces below.
Set beneath Otemachi Tower near Eitai-dori and just steps from Otemachi Station, the two-level complex occupies B1F and B2F at the center of a five-line interchange, turning a major transfer point into a sequence of shops, restaurants and open gathering areas. A 15-meter-high atrium cuts through three levels beside the commercial floors, drawing natural light downward through a broad opening that visually connects the underground interior with the greenery above. Escalators rise through that void toward the surface, and views into dense planting soften the transition between subway concourses and Otemachi Tower's ground plane. Connections with the Tozai and Marunouchi lines expand the complex into the surrounding pedestrian network, allowing movement between rail platforms, office towers and commercial spaces. The result is an underground destination whose strongest architectural move is vertical, using light, planting and a tall internal void to connect Tokyo's subterranean transportation infrastructure with the city above.
What defines OOTEMORI.
OOTEMORI is best known for converting a formerly passage-oriented section of Otemachi's underground network into the commercial and pedestrian center of Otemachi Tower's redevelopment. Tokyo Tatemono announced the OOTEMORI name in July 2013 as the commercial zone of the Otemachi 1-6 project, with the tower's first phase scheduled to enter service that August. The project occupied a critical point between Otemachi Station's five subway lines and the Marunouchi Naka-dori axis, giving the development team an opportunity to reorganize movement between underground rail infrastructure and the surface business district. Existing station passages had been narrow and principally dedicated to circulation, so the redevelopment widened the Tozai Line concourse and enlarged the connection toward the Marunouchi Line. OOTEMORI occupied the first and second basement levels within that rebuilt circulation system, placing commercial activity directly beside routes used by commuters moving through the station. The project team also concentrated surface pedestrian space to prepare for an eventual extension of the Naka-dori pedestrian axis northward toward Kanda. Otemachi Tower reached full completion in April 2014, integrating the commercial zone with offices, Mizuho Financial Group's headquarters and Aman Tokyo on the upper floors. The completed project made OOTEMORI part of a larger attempt to reconnect an intensely developed business district vertically and horizontally, using the commercial floors as the inhabited layer between subway infrastructure and the tower above.
The Plaza supplies the architectural mechanism that distinguishes OOTEMORI from a conventional underground shopping corridor. Its void rises from B2F toward ground level through an opening equivalent to three storeys, bringing sunlight into a depth normally dependent on artificial illumination. Large glazed surfaces maintain views toward the planted ground outside, drawing the woodland visually into the interior even before pedestrians reach the surface. Retail frontages were kept open toward the Plaza to strengthen the continuity between circulation, commercial interiors and the central void. The development also positioned escalators to make vertical movement conspicuous, converting ascent toward street level into part of the composition. That relationship received a stronger environmental dimension as the woodland matured after its August 2013 completion, and in 2025 the Otemachi Tower project received the Minister of Land, Infrastructure, Transport and Tourism Award in the sixth Green Infrastructure Awards. More than a decade after opening, the relationship remains the complex's central architectural idea: an underground commercial environment organized around a direct visual and physical connection with living vegetation at the surface.
How OOTEMORI fits.
OOTEMORI works as the anchor for an Otemachi route through three nearby sites that carry the district backward from its contemporary underground city into a medieval warrior cult, the Tokugawa political order and the waterways that once controlled movement around Edo.
Begin at Masakado's Tomb, where a stone memorial preserves the extraordinary afterlife of Taira no Masakado within a district now dominated by corporate headquarters. Masakado seized provincial government centers across the Kanto region during his tenth-century rebellion and proclaimed himself a new emperor before forces led by Taira no Sadamori and Fujiwara no Hidesato defeated him in Shimofusa; his severed head was subsequently exposed at Shichijo-gawara in Heian-kyo. A later legend held that the head flew east and landed on this ground, and renewed memorial rites followed after stories of Masakado's angry spirit persisted into the thirteenth century. The site later occupied the courtyard of the Edo-period upper residence of Sakai Utanokami, then survived another dramatic change when rebuilding of the Ministry of Finance after the 1923 Great Kanto Earthquake removed the older mound. Continue at Remains of Edo era residence of Hitotsubashi domain, which preserves the location of one of the Tokugawa houses created to supply potential successors to the shogunate. Tokugawa Yoshimune, the eighth shogun, established the Hitotsubashi line through his fourth son Munetada, whose residence stood inside the Hitotsubashi-mon area and extended toward ground now occupied by the Otemachi government district. Shibusawa Eiichi later entered the service of Hitotsubashi Yoshinobu through the recommendation of Hiraoka Enshiro, linking this former feudal residence with a figure who subsequently helped establish banks, companies and economic institutions across Meiji Japan. Archaeological work in 2017 exposed remnants associated with the residence, moat and building complex, giving physical form to a political household whose final head to become shogun presided over the closing years of Tokugawa rule. Conclude at Hirakawa Bridge, where a surviving approach to Edo Castle retains a radically different function from the principal entrances used by daimyo. The first bridge was constructed in 1614, and the present timber crossing, rebuilt in 1988 with Taiwanese cypress above stone and steel supports, spans 29.7 meters toward Hirakawa-mon. That gate served as the principal entrance to the castle's Sannomaru, an access point for the Tayasu, Hitotsubashi and Shimizu branches of the Tokugawa family and a passage used by women of the inner palace. Its darker designation as the Unclean Gate came from its use for carrying corpses and condemned people out of the castle, giving this surviving masugata a role sharply distinct from the ceremonial hierarchy associated with the main entrance. The progression moves from Masakado's Tomb's medieval rebellion through Remains of Edo era residence of Hitotsubashi domain's place within Tokugawa succession into Hirakawa Bridge's controlled passage through Edo Castle, placing OOTEMORI above a district whose contemporary circulation overlays centuries of political movement and restricted access.
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