The Quiet Demise of Asia's Once-Largest Trading Floor

 　There's a building in my neighborhood — Shiohama 2-chome in Tokyo's Koto Ward — that is, or rather was, something remarkable. Today it stands wrapped in blue construction netting, being quietly dismantled.

　A distinctive curved-glass facade. The kind of slightly futuristic design that 1980s Japanese office buildings carried with such confidence. I used to walk past it without a second thought. But how many people know that this was once called "the largest in Asia"?

A Dream the Size of a Soccer Field

　In May 1988, at the peak of Japan's bubble economy, Sanyo Securities completed its trading center here. At roughly 6,400 square meters, with 800 dealers able to trade simultaneously, it was hailed as the largest in Asia (literally, "Number One in the Orient" — Toyo-ichi — in the Japanese press of the time).

　The floor was twice the size of the Tokyo Stock Exchange's trading floor — a full soccer pitch would fit inside. Three thousand state-of-the-art computer terminals lined the room. Giant monitors covered the walls, displaying market data from around the world, 24 hours a day. There were even sleeping quarters, ready for an era when global markets never stopped.

　The president, Yoichi Tsuchiya, was a former Nomura Securities executive who believed deeply in computerizing the securities industry. Weekly Diamond magazine called Sanyo "the securities firm looking to the future." It was, in many ways, the perfect symbol of an era when Japanese money seemed to rule the world.

Japan's First Postwar Securities Failure

　The dream did not last.

After the bubble burst, failed real estate investments and bad loans from affiliated non-bank lenders piled up. Ironically, the very computer investment Sanyo had been so proud of became a financial burden. The company posted losses for six consecutive years from fiscal 1992.

　On November 3, 1997, Sanyo Securities filed for court protection — the first postwar bankruptcy of a Japanese securities firm. More consequentially, Sanyo defaulted on roughly 1 billion yen in the interbank call market. That single default shattered confidence in Japan's financial system.

Within three weeks, Hokkaido Takushoku Bank collapsed (November 15), followed by Yamaichi Securities (November 22). What economic historians now call Japan's "1997 financial crisis" — the moment the Lost Decade truly began — was set in motion by the company that owned this building in Shiohama.

A Second Life Under TIS

　In 2000, at the height of the dot-com era, Toyo Information Systems (now TIS Inc., one of Japan's largest IT services companies) purchased the building and converted it into a data center. The TIS president at the time told Nikkei in an interview:

"We were fortunate to get the former Sanyo Securities building. It's close to central Tokyo and the seismic infrastructure is already first-class."

He had a point. The structural requirements of a trading floor — heavy floor loads, abundant power, sophisticated cooling, dense communication lines — mapped almost perfectly onto data center needs. The building that had once supported 3,000 securities terminals now housed servers powering the early Japanese internet.

　For the next quarter century, as TIS Tokyo Center No. 3, it quietly supported a corner of Japan's digital infrastructure.

And Now, Quietly

 　In the spring of 2026, demolition began. The new developer is Mitsui Fudosan Residential, suggesting the site will likely become housing.

　Right next door, on the former site of a driving school, an 18-story rental tower called Brookside Residence Kiba has just opened its doors. Residents are moving in. A Kasumi supermarket is preparing to open on the ground floor.

　Shiohama 2-chome itself is in the middle of a generational shift. A new data center by Hulic is rising just south of here. Another AI-ready data center is planned a few blocks north in Sengoku 3-chome. Data centers and residential towers are now competing for the same limited land and electricity — a tension that defines Tokyo's AI era.

38 Years, Compressed

　Looking at it this way, this small patch of land is a miniature of postwar Japan's economic history. Bubble-era finance (Sanyo Securities) gave way to the IT revolution (TIS), which is now yielding to housing and AI infrastructure (Mitsui Residential and the new data centers). The same plot of earth has carried, in turn, each protagonist of each Japanese economic era.

　The building that arrived with such fanfare in 1988 — "the largest in Asia" — is now disappearing without ceremony, almost without notice. The dreams of bubble-era traders, the ambitions of early internet entrepreneurs, the everyday hum of cloud-era servers: all of it stood inside these walls for 38 years.

　Through the blue netting, I can see a worker high up on the scaffolding. I felt I had to record this, before it was gone.