Shinjuku Eastside Square

A 20-story large-scale office and commercial complex completed in 2012, directly connected to Higashi-Shinjuku Station, with standard floors of approximately 1,780 tsubo — among the largest single-floor offices in central Tokyo.

Use

Office tower

Area

Shinjuku City

Completed

2012

Floors

20 above ground

A Large-Floorplate Office on the East Side of Shinjuku

Shinjuku 6-27-30, Shinjuku City. A one-minute walk from Higashi-Shinjuku Station, served by both the Toei Oedo Line and the Tokyo Metro Fukutoshin Line, Shinjuku Eastside Square opened in 2012 as a 20-story office and commercial complex. The building’s defining characteristic is the scale of its standard floor: approximately 1,780 tsubo (around 5,880 square meters), placing it among the largest single-level office spaces available in central Tokyo. With 10 elevators and deep, flexible floor plates, it caters to companies that need substantial, contiguous workspace — large call centers, IT firms, or corporate headquarters requiring a single connected environment. Despite its scale, the building sits slightly east of Kabukicho, in a pocket of Shinjuku that feels more workday-functional than entertainment-oriented.

The East Side Discovers Its Office Potential

Shinjuku’s west side — Nishi-Shinjuku — has been associated with large-scale office development since the 1970s, when the former Yodobashi Water Purification Plant was redeveloped into the city’s most concentrated skyscraper district. The east side, by contrast, was long defined by Kabukicho’s entertainment zone and surrounding residential streets, with office development scattered in smaller, older buildings. The opening of the Fukutoshin Line in 2008 raised Higashi-Shinjuku Station’s profile, connecting it directly to Shibuya and Ikebukuro and making the eastern fringe of Shinjuku more legible as an office address. Shinjuku Eastside Square was developed in that context — a building that brought large-scale office capacity to a part of Shinjuku that had not previously been associated with it. Its completion in 2012 marked a quiet expansion of Shinjuku’s functional geography beyond its famous west-side towers.

Summary

Shinjuku Eastside Square was completed in 2012 with 20 floors above ground. Directly connected to Higashi-Shinjuku Station, it offers standard floors of around 1,780 tsubo — a rarity for central Tokyo — to companies that need substantial, uninterrupted workspace. The building sits in a part of Shinjuku that sits between the nightlife of Kabukicho and the high-rise business district of Nishi-Shinjuku, occupying a quieter middle ground. Walking east from Shinjuku Station toward Higashi-Shinjuku offers a view of this more functional, less flashy layer of one of Tokyo’s most varied neighborhoods.

Related: Tokyu Kabukicho Tower / Shinjuku Center Building

Looking for a hotel in Shinjuku? Rakuten Travel has a wide selection nearby.