Mori Building

Company history

Financial history 2016–2026 — revenue, cost structure, balance sheet, cash flow and key ratios, year by year →

Founded
1959
Head office
Minato, Tokyo
Ownership
Private (unlisted)
Founder
Mori Taikichiro
Revenue · FYE Mar 2026
$2.6B (¥411bn)
Net profit · FYE Mar 2026
$335.7M (¥53bn)
Mori Building: long-term performance & turning pointsSales (revenue) and profit-margin ratio
Sales (¥ bn)Net margin (%)

1959A professor who would not leave Toranomon

  1. 1956The first Mori Building, funded by a 50%-over-market land sale
  2. 1959Mori Taikichiro leaves academia; Mori Building incorporated
  3. 1964Recession leaves the 10th and 11th buildings hard to let

Mori Taikichiro was born above a rice shop in Toranomon and spent his early life trying to get away from it. He read economics at Tokyo University of Commerce, taught at a sericulture college in Kyoto, and after the war moved to Yokohama City University, where he became dean of the commerce faculty. His father held nearly a hundred rented houses; almost all of them burned in the air raids. Returning to sort out the ruins, Mori stood at Shinbashi station looking over a burnt plain and, by his own account, resolved to rebuild with his own hands the place he had been born in.

What he brought to property was not a dealer’s instinct for prices but an academic’s habit of reasoning from a premise. Expecting postwar inflation, he used his father’s money to buy foreclosed land cheaply in Ginza and Shinbashi. When it duly appreciated in 1956 he refused to sell at market: he told a broker to place it at fifty per cent above the going rate, and when the broker balked, argued him down — Tokyo’s population would concentrate, land prices would rise geometrically, and a buyer paying half again over the odds would still not lose. An insurance company took it. Mori pocketed $83,333 (¥30m) and borrowed the same amount again from Daiichi Trust Bank to put up the first Mori Building.

In 1959 he gave up the deanship. The office that had been managing four buildings was incorporated in June that year as Mori Building Co., Ltd., capitalised by Mori himself and by four companies he had already set up with one of his four children as the largest shareholder of each. He never built outside a small patch of Toranomon, and explained the concentration as cowardice: scholars tend to caution, and he was cautious to the point of timidity, so investing on someone else’s ground frightened him, while in Toranomon — his own garden — he could work out the return in advance. There was calculation in it too. Buildings clustered in one district raise each other’s value; as the streets take shape the whole area is re-rated, first-class tenants arrive, land prices rise, collateral capacity rises with them, and the next project is easier to fund. The recession of 1964–65 tested it — vacancy across the trade passed seven per cent, the tenth and eleventh Mori buildings completed into an empty market, and the company got through only by selling land in Aoyama and cutting rents.

Read the full history in Japanese →


1970From buildings to blocks: twenty years to Ark Hills

  1. 1971Akasaka named the first private-developer redevelopment; 40 buildings around Toranomon
  2. 1978Laforet Harajuku opens — the first move beyond offices
  3. 1986Ark Hills completes, twenty years after the project began

By February 1971, when the Nikkei reported that Tokyo would redevelop Akasaka as a model of living close to work, Mori Building had put up more than forty buildings in the streets around Toranomon. It had ¥1bn of capital and 250 staff; sales had gone from ¥288m in fiscal 1961 to a run rate approaching ¥3.3bn a decade later, and book assets stood at ¥25bn — ¥100m per employee. The Akasaka scheme was the first use of a private developer under the Urban Redevelopment Act and the largest project since the Shinjuku subcentre plan: eighty thousand square metres beside the American embassy, to hold high-rise offices, a hotel and apartments.

The work of redevelopment is almost entirely the work of buying land, and Mori refused to rush it. Property, he said, is unlike other goods in being a monopoly over a place; push with money and you fail, so you study the other side’s interests and share out fairly the value the new building will create. The twentieth Mori Building, completed in 1971, had taken ten years of negotiation. Applied to a whole city block, the same method took sixteen years to assemble the site and twenty in all: Ark Hills completed in March 1986.

Two other things took their present shape in these years. One was the group’s structure, built for inheritance rather than for business: four companies, each with one of Mori’s children as principal shareholder, held the property, with a voluntary association acting as the secretariat; Mori Building Development was added in 1970 for shorter-cycle projects, and two more companies were carved out later as the assets grew. The other was the first move beyond office leasing — Laforet Harajuku, opened in October 1978, a retail building with a location and a customer entirely unlike the Toranomon office district. Common functions were then split off into separate firms, leaving Mori Building and Mori Building Development as, in effect, asset holders with a handful of employees each. The arrangement served both inheritance and operations, and made the group very hard to read from outside.

Read the full history in Japanese →


1987The unrealised gains disappear

  1. 1991Forbes names Mori Taikichiro the world’s richest man
  2. 1993Mori Taikichiro dies; the group splits between two sons
  3. 1994Unrealised land gains down from ¥1.5tn to the low hundreds of billions

Around 1975 Mori Building had changed how it borrowed, and the change decided how it survived what came next. It withdrew the land and buildings pledged as collateral to its banks and asked instead to be lent against the group’s earning power — treating the whole group as a single project. It took about two years of negotiation, with the income statements of existing buildings in hand, to get the banks to accept. Even in 1995, apart from a Japan Development Bank facility, its borrowings were unsecured, and it held itself to a rule that net debt should not exceed five times earnings.

Land prices still did the damage. In the year to December 1994 the group’s sixteen companies carried land, including leaseholds, at about ¥618bn against roughly ¥1,008.7bn implied by published land prices — some ¥400bn of unrealised gain. Measured on the basis used for the land value tax, however, the figure came to only about ¥760bn, and the gain all but vanished. Unrealised gains, Mori Building Development’s president Mori Akira admitted, had fallen from a peak of ¥1.5 trillion to the low hundreds of billions. Interest-bearing debt reached ¥770bn, more than seven times operating revenue — past the company’s own five-times rule. Revenue itself fell from ¥120.2bn in 1992 to ¥101.6bn in 1994, and net profit from ¥5.7bn to ¥4.5bn.

Mori Taikichiro died in February 1993. Forbes had once named him the richest man in the world, at an estimated ¥2.7 trillion in 1991; he shrugged that off, saying the true measure was what remained once the bubble was taken out. His taxable estate came to about ¥3.9bn and the inheritance tax to under ¥1.4bn — the return on decades of putting assets into his children’s names. Two sons took over: Mori Minoru, expansionary by instinct, around Mori Building and Mori Building Kosan, and Mori Akira, a former banker and the more cautious, around Mori Building Development and Mori Building Sangyo. Neither thought a single company possible, and merging the two sides would have cost too much tax. Their prescriptions differed accordingly: Minoru sought to offset weak rents with three projects in Dalian and Shanghai, capping the group’s exposure at under ¥20bn — a fifth of project cost — with institutional investors and trading houses alongside; Akira set out to raise the utilisation rate of land the group already held from under fifty per cent to seventy within three years.

Read the full history in Japanese →


2000Roppongi Hills, and the shift from owning to operating

Revenue (¥ bn, bars) · net margin (%, line)
Source: securities reports
FY2016 · consolidated
Revenue$2.4B
Net income$501M
Net margin21%
FY2026 · consolidated
Revenue$2.6B
Net income$336M
Net margin12.9%
  1. 2003Roppongi Hills opens; head office moves in
  2. 2004A child is killed by a revolving door at Mori Tower
  3. 2006Omotesando Hills
  4. 2008Shanghai World Financial Center
  5. 2014Toranomon Hills Mori Tower
  6. 2023Azabudai Hills

The Roppongi 6-chome site — eleven hectares of dense restaurants and housing — had been targeted for completion in 2001. Roppongi Hills in fact opened in April 2003, and Mori Building moved its head office into the tower. The financing had been redesigned along the way. At Ark Hills the company ended up owning three-quarters of the site; at Roppongi, Minoru said, he wanted to hold a third and let more of the existing landowners take part in the scheme itself, while selling completed office floors to investors and taking a management fee rather than buying and leasing them on its own book. For a company whose unrealised gains had evaporated, that was the only way left to keep opening city blocks on a ten-year cycle — and it moved the business from owning land toward running places.

The same instinct for control that made the projects possible also produced the worst day in the company’s history. In March 2004, less than a year after opening, a child was killed when his head was caught in one of the tower’s automatic revolving doors; the Metropolitan Police searched both Mori Building and the manufacturer, Sanwa Shutter, on suspicion of professional negligence, and the two companies disagreed publicly about the sensors’ blind spot, the stopping time and the record of earlier incidents. The doors had been chosen for air-conditioning efficiency — paired sliding doors stand open when traffic is heavy and let outside air pour in — and, like the stacked double-deck lifts and the basement generators, they belonged to Minoru’s taste for putting the newest equipment into his districts. Trade opinion afterwards held that a revolving door suited a building with a known set of users, not a tourist landmark receiving tens of millions of visitors a year. Minoru said the revolving doors would never be used again, and was turned away at the reception desk when he asked to attend the wake.

Development continued outward from Roppongi: Omotesando Hills in January 2006 on the site of the old Dojunkai apartments, the Shanghai World Financial Center in August 2008, Ark Hills Sengokuyama in 2012, and then a continuous run in Toranomon — Toranomon Hills Mori Tower in May 2014, the Business Tower in 2020, the Residential Tower in 2022, the Station Tower in 2023 — followed by Azabudai Hills from June 2023. Consolidated operating revenue rose from ¥259.2bn in the year to March 2016 to ¥411.1bn in the year to March 2026, with ordinary profit up from ¥57.4bn to ¥91.2bn, and headcount from 3,108 to 4,407. The mix has shifted with the model: leasing is still the largest line at ¥251.8bn of revenue, but condominium sales, at ¥79.5bn of revenue, threw off ¥56.1bn of profit against leasing’s ¥48.5bn — the business of building floors and selling them now carries the group. The capital, meanwhile, has not moved at all. Two of the holding companies the founder created for his children’s inheritance hold 70.33% and 25.65% of the shares, together more than ninety-five per cent, and Mori Building remains unlisted.

Read the full history in Japanese →


Key decisions — the author’s view

Revenue (¥ bn) · net margin % · around FY1959

Incorporating the family office as Mori Building, and concentrating on Toranomon (1959)

The scholar who brought the habit of calculation

Mori Taikichiro explained his refusal to step outside Toranomon by saying that scholars tend to caution and that he himself was cautious to the point of timidity. Investing on someone else’s ground frightened him; in Toranomon, which was like his own garden, he could work out in advance whether a project would pay. When in 1956 he made a broker swallow a price fifty per cent above the market, he derived the rise in land values from a premise — that Tokyo’s population would concentrate. What was brought into this business was not a property dealer’s feel for prices but a scholar’s habit of setting out premises and calculating forward.

That caution was not rewarded from the start, however. In the recession that began in 1964 the tenth and eleventh buildings could not be filled, and the company got through only by selling land it held in Aoyama to raise cash and by cutting rents. In meetings with the contractors he said things wide of the mark and was laughed at; he had to borrow lease agreements from Mitsubishi Estate and Mitsui Fudosan to make do. The habit of calculation began to pay only after he had survived this period as an amateur.

Revenue (¥ bn) · net margin % · around FY1986

From single buildings to urban redevelopment: Ark Hills (1986)

What the principle of never hurrying had to carry

“Never hurry — that is the knack of buying land.” For a single building the principle showed up as ten years of negotiation. Applied to a whole block in Akasaka, it became sixteen years to assemble the site and twenty to completion. A project that in the 1971 reports was expected to break ground the following year in fact ran to 1986. To choose the method of sharing added value with the existing landowners was also to decide to carry the money through all that time. Behind the negotiations that would not hurry, one can see a cash position that could not.

Whether a project on this scale matched the company’s strength is another question. Mori Akira later said of Ark Hills that “judged by our capacity, the investment was ¥100bn too large.” The rents on which the investment case rested rose during the bubble, and the company mistook that for extra headroom. What was really supporting the business was the unrealised gain in its land, and when that gain disappeared in the 1990s, opening the next block by the same method became impossible. A success that took twenty years turned into the constraint of the following twenty.

Revenue (¥ bn) · net margin % · around FY1975

Releasing collateral and borrowing against group cash flow — and staying unlisted (1975)

The complaint that Mori takes only the good parts

What Mori Building released around 1975 was the land and buildings it had pledged to its banks. Instead of mortgaging assets one by one, it persuaded the banks to lend against the group considered as a single project — a negotiation that took some two years before the terms were accepted. Rental income carries very little cost of sales and is close to gross margin; redesigning the debt so that it was repaid out of that income can be seen as one reason the balance sheet held twenty years later, when unrealised land gains fell from a peak of ¥1.5 trillion to the low hundreds of billions.

This was not, however, a flawless structure. In the year to December 1994 interest-bearing debt reached ¥770bn, more than seven times operating revenue, already beyond the five-times limit the company had set itself. And the method of staying private while inviting institutional investors and trading houses into joint ventures drew complaints from partners that Mori was taking only the good parts. To raise money widely from investors is to owe them the disclosure a listed company gives and to hear them as shareholders. What Mori Building avoided may have been less the short-termism of public shareholders than the burden of that disclosure and explanation.

Revenue (¥ bn) · net margin % · around FY2003

Roppongi Hills: from buying the land to bringing owners and investors in (2003)

A design that limits investment, run by a man who decided the details

A company that had ended up owning three-quarters of the Ark Hills site now said it wanted to hold a third at Roppongi. The construction of the business itself had changed — from buying up land and keeping the development profit, to sharing the burden with existing landowners and outside investors. For a company whose unrealised gains had fallen from a peak of ¥1.5 trillion to the low hundreds of billions, this was the only road left on which decade-long redevelopment could continue. Having chosen not to buy, Mori Building’s work drifted from holding land toward operating a district.

The design that limited investment nonetheless coexisted with management that decided every detail in person. In the museum and retail spaces on the upper floors, lifts and staircases were removed at short notice on Mori Minoru’s word that they obstructed the flow of people, and the colour of a high-rise apartment building’s exterior wall drew instructions from him too. Less than a year after opening, a child was killed in an automatic revolving door and the Metropolitan Police searched Mori Building and Sanwa Shutter. It is hard to argue that a way of working in which nothing proceeds until the boss is satisfied with the smallest feature of a building was well matched to the demands of safety at a place that receives tens of millions of visitors a year.

Each heading links to the full Japanese analysis — background, decision and outcome, with sources.


References & sources

This is a condensed English edition. The full, source-by-source history — with the detailed narrative, financial tables, shareholders and executives — is maintained in Japanese: 日本語版(詳細)— Mori Building full history in Japanese →

  1. Mori Building Co., Ltd. — 有価証券報告書 (annual securities reports).
  2. Nikkei Business — 日経ビジネス (Nikkei BP): 3 May 1971 (Mori Taikichiro on land buying and the Toranomon concentration); 7 Aug 1995 (group finances, the succession, Roppongi); 5 Apr 2004 (the revolving-door accident).
  3. Nihon Keizai Shimbun — 日本経済新聞, 11 February 1971 (Akasaka named the first private-developer redevelopment under the Urban Redevelopment Act).

Yen amounts are converted at the average rate of each figure’s own year — not today’s rate; revenue charts are shown in yen. Exchange rates & sources — the full ¥/US$ table →


Disclaimer


Data API

Mori Building’s history, financials, executives and shareholders are published as static JSON — no key, plain GET.

Method Endpoint Returns
GET /api/companies.json All companies
GET /api/mori-building/manifest.json Resource index
GET /api/mori-building/history.json History overview
GET /api/mori-building/timeline.json Chronology
GET /api/decisions.json All management decisions (index)
GET /api/mori-building/decisions.json Management decisions (index)
GET /api/mori-building/decisions/{slug}.json One decision (full dossier)
GET /api/mori-building/executives.json Executives
GET /api/mori-building/shareholders.json Major shareholders
GET /api/mori-building/financials.json Financial statements
GET /api/mori-building/financials-longterm.json Long-term results
GET /api/mori-building/segments.json Business segments
GET /api/mori-building/regions.json Sales by region
GET /api/mori-building/workforce.json Workforce