2008: Roppongi Hills at Five

Roppongi Hills

2008 marked five years since the opening of Roppongi Hills — a massive office/residential/retail complex in downtown Tokyo, completed after 17 years of planning by heavyweight developer Mori Building. Roppongi Hills became the most powerful architectural symbol of early 21st century Koizumi-era economic promises, but after a combination of scandals, bankruptcies, and high rents, its reputation has been scorched — to the point where some wonder if the entire development is cursed.

When Hills opened in 2003, the Koizumi era was in full swing. “Structural reform” and “deregulation” were buzzwords. The economy was in recovery from the IT bubble recession. And the lineup of initial tenants — including many big names in IT and finance: Lehman Brothers, Son Masayoshi’s Yahoo! Japan, Mikitani Hiroshi’s Rakuten, and Horie Takafumi’s Livedoor — promised to lead Japan in a new economic direction. Today, Lehman Brothers has experienced one of the most damaging bankruptcies in world history, and almost all the former headline tenants have left the building. What happened?

Back in the Hills heyday, no one embodied the possibilities of the new economy more than Horie Takafumi — an abrasive, unapologetically casual… okay, “slob” visionary, Tokyo University dropout, and tech entrepreneur. But he was just one of the so-called Hills-zoku (”Hills tribe”) — nouveau riche businesspeople known as risk-takers, aggressively capitalist, technology driven, casual, and lavishly rich. Horie took Livedoor, a web portal that came into being just as high-speed Internet was becoming the norm in Japan, and transformed it into a market player through a series of rapid-fire acquisitions funded by stock-split schemes and backed by pure bravado and aggressive public relations. He was quite successful at inserting himself into the public zeitgeist through his blog, books, and TV appearances, earning himself enough begrudging respect to get Livedoor accepted into business association Kedianren and run an ultimately doomed campaign for a parliamentary seat (backed by Koizumi).

He undertook brazen attempts to leverage his way into a media empire, bold moves that made many powerful enemies in Japan’s business community — notably Yomiuri Shimbun president Watanabe Tsuneo. After an unsuccessful attempt at purchasing a pro baseball team, he tried a backdoor method of entering the broadcasting industry by exploiting loopholes in after-hours stock trading regulations, although ultimately thwarted by a court decision. His critics claimed that while many of Horie’s tactics followed the letter of the law, they trampled all over the Japanese “business culture” of unstated rules and careful, back-channel negotiation. Prosecutors placed on his scent eventually arrested him under a flurry of charges, including spreading false rumors, submitting false reports, and accounting manipulation.

The January 16, 2006 raid on Horie’s residences, a symbolic message to the investment community of what would not be tolerated in modern Japan, sent the stock market into a free-fall that earned its place in history as the “Livedoor Shock.”

Horie’s fall from grace marked the beginning of a long slide for Roppongi Hills’ image. Fellow tenant Murakami Yoshiaki — head of an aggressive buyout fund that exploited the president’s contacts as a former METI bureaucrat — was arrested in 2006 for insider trading allegations stemming from a conversation held with Horie. Almost three years later, Murakami and Horie continue to live in Roppongi Hills as they fight their respective legal battles, but the perceived glamor of their locale has all but evaporated.

As Prime Minister Koizumi’s term headed to a close in late 2006, worries that Japan faced growing income disparity — fanned both by reality and the many opponents of Koizumi’s neo-liberal agenda — changed the prism in which Roppongi Hills was viewed. The office complex came to be known as a symbol of the amorality and unfairness of global capitalism and became synonymous with the negative aspects of the structural reform movement.

Heading into 2008, many of the complex’s big tenants’ five-year leases came up for renewal, and some, such as Rakuten and Livedoor, decided that the now-moot image boost from locating in Roppongi Hills no longer justified the high rent. Rakuten is now in Shinagawa, while Livedoor, forced to fundamentally rework its business after the Horie scandal, has since relocated to Kabuki-cho in Shinjuku. Another former tenant, employment agency Goodwill, suffered its own spectacular fall from glory as it became clear that it was exploiting day laborers and the boss was cavorting with lots of young idols. And with the worsening of our newest financial crisis, Lehman Brothers has become the latest casualty. The last time this author checked, tourists could be seen taking photos next to the big Lehman Brothers sign just outside Hills’ main building.

Last year, Mitsui Fudosan opened Tokyo Midtown, a similar complex just down the street from Roppongi Hills. In essence, the complex seems determined to recapture the magic of Roppongi Hills but without the troublesome controversy that comes with snuggling up to start-up companies. Along with design, media, finance, and law firms (with a good dose of foreign capital), landmark tenants at the new complex include well-respected companies that actually “make things” — such as video game/fitness equipment maker Konami and film/copier juggernaut FujiFilm-Xerox. Goodwill ended its run as a Midtown tenant, but so far the complex has not garnered a reputation for corruption. Recent additions to the Tokyo skyline include Akasaka Sacas, home to TV station TBS and Hakuhodo, while other developments planned include reworked historical landmarks such as the Tokyo Central Post Office and Kabukiza in Ginza.

But these more conservative projects are unlikely to define their age as Roppongi Hills did. Despite the supposed curse and all the invective directed toward it, Roppongi Hills exuded not just lavish wealth and self-indulgence, but ultimately, economic growth, inspiration, and hope for the future. Whether or not Horie was a fraud, the zeitgeist bubbled with the sense that a new economy was brewing and entrepreneurship could be a new path for young graduates. Even women seemed to have opportunity in this new world, as underscored by the once-stellar reputation of Horie’s PR representative Otobe Ayako. While a series of regulatory incentives aimed at spurring the long-stagnant economy have instigated a massive glut of both residential and commercial construction in this city, the endless construction of new buildings without much regard for where the tenants will come from makes me worry that the decline of Roppongi Hills may just mark the slow death of Tokyo’s last good idea.

Adam RICHARDS
December 5, 2008

Adam Richards lives in Tokyo and is a founding member of the blog Mutantfrog Travelogue.

Ask an Architect: Insulation

Insulation

English / 日本語

From December to February, Tokyo apartments are often colder inside than outside. After braving another winter in sub-igloo comfort, we decided to ask someone in the know where exactly the insulation’s at. The following queries were floated to Néojaponisme’s resident architectural adviser Ashizawa Keiji, who has gracefully explained why Japanese residences do not fare so well in Japan’s seasonal extremes.

Why is there so little insulation in Tokyo homes? And why is central heating not used?

First of all, you can’t say that houses in Japan don’t take heating into consideration. The main actor for temperature control in Japanese living spaces is local heating (partial heating), as symbolized by the kotatsu — the heated table that occupies the cha no ma or living area in so many houses even today.

When I think back to my childhood, I remember that everything in the house outside of the kotatsu during winter was almost as cold as outside. So no one wants to ever leave the kotatsu. We would decide by rock-paper-scissors who had to go get the mikan from the entry hall. The entry hall was as cold as a refrigerator, so we used it to store things like mikan. The corridors and bedrooms (if you weren’t under a futon) were so cold that you could see your breath. So, it was really important to warm yourself up in the bath. And it was really hard to get out of bed in the morning.

A greater awareness of insulation began during to the oil shock of 1973. An idea formed that one could heat the entire home through insulation. When people did the math, they realized that the old way of doing things — only heating up an uninsulated six-tatami room full of cracks and openings — was not energy efficient. Therefore you needed to increase the efficacy of insulation and make more airtight construction. But this then led to “shock houses.” The so-called shock house was a house that caused health problems such as allergies or atopy due to the emission of synthetic chemical materials used in construction. This is why specialized alarms are required in residences constructed today. Every room must have an air vent, and the ventilation fan is left on 24 hours a day. Some claim that this makes the house colder, leading many people to shut off the ventilation during the frigid depths of winter, even if they are aware of the shock house problem.

Is there any desire (either by architects, developers, or dwellers) for more insulation or other uses of heating in modern homes?

High levels of thermal insulation or air sealing are part of many house builders’ sales pitch, and paying attention to insulation is gradually becoming commonplace. I should add, however, that some contractors do remain skeptical…

Although the rules are not set as clearly as in Europe or the United States (due to the regulations of the Government Housing Loan Corporation), builders often publicize and reference the volume of insulation in the roof walls and floor. The idea of localized heating is therefore gradually becoming a thing of the past. Now, even cheap rental apartments have air conditioning units [note: Japanese AC units normally include both heaters and coolers] installed, and it has become a standard custom to heat the entire room.

While there are many different kinds of insulation, the most commonly used one is fiberglass, which is extremely inexpensive. Leaving out insulation is therefore not a particularly clever way to save on construction expenses. Of course, there are builders who ignore insulation in their designs. Houses with large openings and houses with extremely simple construction and thin walls — where the delineation between inside and outside is only marked by spraying concrete — are cold in the winter and hot in the summer.

I once heard a story that, when a certain European country was refurbishing its embassy in Japan, the construction fee was over budget, so the European architect requested a Japanese architect to come up with a cost savings plan. When the European architect saw that one of the suggestions was to “leave out insulation,” he was quite surprised and thought it was a joke! This story happened just a few years ago.

How does the situation in Tokyo compare to other parts of Japan?

Yoshida Kenkō wrote in the Tsurezuregusa that when building a house, one should focus on the summer. This has become fundamental to dwellings in many regions of Japan, meaning that the emphasis is on keeping summer as cool as possible. Only in Hokkaido is there such a thing as the Law on Cold Residences, and the Government Housing Loan Corporation gives financial assistance to homes protected against the cold. They say that people from Hokkaido catch colds when they come to Tokyo, because they traditionally live in houses insulated and warmed through central heating.

Do more expensive homes in Tokyo have central heating/cooling?

There are cases in the past where they put central heating into luxury apartments or homes, but I think it’d be very rare now to see that. They use central heating as a general rule in Hokkaido though.

If my current apartment has insulation, why is it so cold in the winter? Is it just because it was built for summer?

It’s probably that the windows are only single-layer glass, which lets cold air pass in and out. Rental apartments rarely use “pair glass” (glass with insulating properties.) The idea is that you should make the apartment tolerable in the summer, and cost-wise, this is a very convenient strategy for the managers.

Which is warmer in winter: wooden structures (アパート) or concrete structures (マンション)?

That’s a tough question. New apartments are clearly better than old apartments. I have lived in both an old concrete apartment and a old wooden apartment, and both were super cold in winter and fiercely hot in summer. The wooden apartment, however, was nicer at night, because the concrete would store the heat, making you need to use an air conditioning unit.

東京の家は真冬になると家の中が外よりも寒くなる時がよくある。今年も例に漏れずイグルーほど断熱性のないアパートで冬を過ごした我々は、「日本の家に断熱材は存在するのか?」と詳しい人に聞きたくなった。この質問に答えを出してくれる人は、建築家の芦沢啓治さんが浮かび、季節に極端に対応しない日本の家の事情について説明して頂きました。

なぜ東京の住宅では断熱材をあまり使用していないのですか?また、なぜセントラルヒーティングを導入していないのでしょうか?

そもそも日本には、暖房を意識した家はなかったと言われています。 いまだに多くの家庭のリビング、あるいは茶の間を占領するこたつに象徴されるように、局所暖房(部分的な暖房)が日本の住居において主役でした。

僕の幼少時代を思い出してみても、こたつの中以外は、ほとんど外のように寒かった記憶があります。だから、みなこたつから出れなってしまう。玄関に置かれたみかんをとりにいくのをジャンケンできめていました。玄関はまるで冷蔵庫のように寒かったので、みかん程度のものであれば貯蔵庫として使っていました。廊下はもちろん、寝室も布団の中以外は吐く息が白くなる程でした。だから、お風呂で体をしっかり暖めることが重要だったともいえます。 さらに、朝は布団の中からなかなか出れなくなるわけです。

断熱について意識が向かうようになったのは、1973年のオイルショックが引きがねになったといわれています。断熱することによって、家全体を暖めるという発想がでてきたわけですが、いままでの隙間だらけで、断熱されていない6畳の部屋を暖めていたときよりも、結局のところ省エネではなかったという統計がでています。そこでさらに断熱材の性能を上げ、気密を上げることが 必要となり、こんどはシックハウスの原因となってしまいました。シックハウスとは、建材にふくまれた化学物質が家の中に放出されることによってアトピーやアレルギーなどの体の不調をおこしてしまう家のことです。よって現在つくられている住宅は24時間喚起が義務付けられています。すべての部屋に換気口がもうけられ、24時間換気扇をまわしっぱなしにします。これが寒いというクレームがあるのですが、シックハウスの問題を知りながらも真冬の時期は、切ってしまう人もおおいようです。

新しい家にはもっと断熱材を使用して欲しい、他のヒーティング方法を取り入れて欲しいという希望はありますか(建築家、ディベロッパー、入居者から)?

上の文章でもかきましたが、高断熱、高気密というのは多くのハウスメーカーの売り文句であり、断熱について気をつかうということは、常識になりつつあります。 建築家は懐疑的な人もいますが・・・。

ヨーロッパや、アメリカ合衆国のようにルールが明確にきまっているわけではありませんが、 住宅金融公庫基準という形で、屋根、壁、床の部位における断熱量が公表され、参考にするケースが多いです。そして局所暖房という考え方は過去のものとなりつつあります。いまや、安い賃貸アパートでもエアコンが常備され、部屋全体をあたためるのが常識となりつつあります。

断熱材にはいろいろな種類がありますが、一般的によく使われる断熱材はグラスウールと呼ばれるもので、非常に安価なものです。よって、建築コストを抑えるために断熱材を抜くということはさほど賢い方法ではありません。もちろん建築家の中には、デザインのためにあえて、断熱については無視をしている人もいなくはありません。開口部が大きな家、 非常にシンプルな構造、薄い壁、コンクリート打ち放しだけで内外を仕切っている家は、冬寒くまた夏、暑いです。

そういえば、こんな話を聞いたことがあります。ヨーロッパのある国が日本に大使館をリニューアルする際に、工事費があわなかったので、ヨーロッパの建築家が日本のローカルアーキテクトに減額案を提示するようにとお願いしました。いくつかの減額の中で「断熱材をやめる。」というものがあって、ヨーロッパの建築家はあまりに驚き冗談かと思ったようです。ほんの数年前の話です。

東京の状況は、国内のその他の地域と比べてどうでしょうか?

家の作りようは夏を旨とすべしと吉田兼好が徒然草で記しており、これまでの日本の多くの地域において住居の基本になっているようです。夏をいかに涼しく過ごすかということに主眼を置くということです。北海道だけは、古くから「寒住法」というものがあり、防寒住宅に公庫(住宅金融公庫)が融資支援をしています。北海道の人が東京に来ると風邪をひくというのは、彼らが伝統的に、断熱やセントラルヒーティングによって暖められた家に住んでいるということを物語ります。

東京でも、高級な住宅ではセントラルヒーティング/クーリングを使用していますか?

むかしの高級アパートや、家にはたしかにセントラルヒーティングをいれているケースはあるようですが、現在では稀だと思われます。北海道では一般的にセントラルヒーティングを使っているようです。

私が住んでいるアパートに断熱材を使っていたとして、なぜ冬はとても寒いのでしょうか?夏に適した構造に建てられたのでしょうか?

寒いですか。ガラスはシングルガラスですよね。そこから冷気ははいってきます。賃貸マンションでガラスがペア(断熱性能をもつガラス)になっているものは、非常に稀です。夏をしのげればいいという考え方は、賃貸アパートを建てるうえでは、コスト的に、つまり経営者にとっては非常に便利なコンセプトです。

どちらが暖かいですか: 木造建築 (アパート) または コンクリート (マンション)?

これは難しい質問ですが、ひとついえるのは、築年数の古いアパートと、新築のアパートではあきらかに新築のほうが暖かいと考えられると思います。私も、古いコンクリートマンション、古い木造アパートとも住んでいましたが、どちらも非常に寒いです。では夏はというと、やはりどちらも猛烈に暑かったですね。ただし、夜は木造のアパートのほうが過ごしやすい。なぜなら、コンクリートは蓄熱してしまうので、夏場は、クーラーなしでいられないわけです。

Related Articles:
As an Architect: Concrete Façades
Interview with Ashizawa Keiji

Jean Snow lives and breathes design and pop culture in Tokyo — sustained by an unhealthy addiction to magazines and frequent visits to his favorites cafes. His personal website is located at jeansnow.net.

Roy Berman lives in Kyoto and is one of the three writers at excellent Japan/Asia blog Mutant Frog Travelogue.

Ask an Architect: Concrete Facades

Concrete Uchihanashi

Tokyo may be the ultimate embodiment of “concrete jungle” — not just because of the incomprehensible sprawl, but also the large number of trendy homes, offices, and stores conspicuously using unadorned concrete exteriors. After seeing thousands of these buildings around town (especially in wealthy residential areas), we had a lot of questions: Does this conspicuous use of building material as a design motif serve a functional need? Is it merely a faux-functional design idea? Is it a trend from the 1990s? Is unadorned concrete the only alternative to those atrocious tiles?

We went to our neighborhood architect Keiji Ashizawa to get answers on the origins of these unadorned concrete buildings (コンクリート打ち放し) in Japan.

A gallery of concrete houses is available here. Photographs by Sean Wood.

Is there a specific term for the unadorned concrete facade style in Japanese?

If you just leave the exterior in concrete (without adding tiling or bricks, etc.), it’s called “concrete uchihanashi/uchippanashi.”

When did these uchihanashi houses start to be built in Japan?

They have a long history. In 1923, Antonin Raymond built his own house in Azabu using concrete exteriors. This is said to be one of the earliest concrete exterior buildings.

Le Corbusier and Louis Isadore Kahn used this style a lot too. (see the Salk Institute and Chandigarh) They were superstars among Japanese architects in the past and still continue to be inspirational.

Azuma Takamitsu’s “Tou no Ie” (「塔の家」, The Tower House) is famous in architectural circles, known as a perfect, urban concrete house. But the house has no insulation and no covering.

Ando Tadao is a follower of Le Corbusier. His work “Sumiyoshi no Nagaya” (「住吉の長屋」) had a huge impact on many Japanese architects. At first, he was building these concrete uchihanashi houses because they are cheap. In 1973, a house he built was rumored to have bad leaks in the roof. So Mr. Ando bought the house from the owner, and it’s currently the Tadao Ando Office.

Why are there so many of these houses and buildings now?

There are a cheap and easy choice for architects.

So it’s cheaper to make buildings with unadorned concrete exteriors?

Yes, it’s cheap, but if the interior is also concrete, it can get very cold…

Can concrete houses be built with insulation?

If the exterior is only concrete, most people will put insulation inside the building. But as you can imagine, lots of architects want to do both the exterior and interior as concrete uchihanashi. This creates an extremely strong spatial feeling, and at the same time, lets you assemble the building with simple details, making it easy to express the spatial intention. (For example, the Ibaraki Kasugaoka Church.)

But, concrete-only residential houses are well-known to very cold in winter and very hot in summer. That causes a lot of trouble, and the architect’s plans and the clients’ plans often clash.

However, concrete uchihanashi is often done for the interior and exterior for reasons of budgets. Also, the law requires houses built in urban areas to use a non-wooden building method, so there are times when you are forced to build in concrete for residences.

If you leave both the exteriors and interiors as concrete, it may be much cheaper, but the living environment suffers. Lately, construction methods where the exterior gets insulated (外断熱) have become more widely used. If you do that, you can use the concrete as heat storage.

Why does the concrete always have those circle ○ marks?

This link and link illustrate the process of pouring concrete. The circles are the byproducts of “separators” — parts used to secure the mold. But if you lay out the holes properly, you can get very beautiful concrete uchihanashi like Ando Tadao.

Have concrete uchihanashi houses become less popular in recent years?

Yes, you might say they are starting to be a bit “out.” Uchihanashi houses do not stand out much anymore. They are still cheap to make, but architects and clients are now looking for other materials because unadorned concrete is too popular.

What about other options for building exteriors besides unadorned concrete?

There are lots, like tiling and stucco.

Why do most developers/owners choose tiling?

The amount of money for a mortgage depends on the property value of the building. Developers of “mansion” apartments like to use tile exteriors so that the buyers can take out a big loan. Tiled exteriors signal a high property asset value to Japanese banks, more than unadorned concrete or even paint. So because of that, lots of apartments use tiled exteriors.

Do construction companies put pressure on architects to use concrete because it’s cheaper?

No. Rather, architects put pressure on the builders to leave the exterior in clean concrete. Actually, it’s pretty difficult to do this, so there has been lots of development in techniques for repair recently.

For example, there’s something called the Yoshida Method. The company mostly consists of painters, and they repair rough concrete to make it look like a nice concrete uchihanashi exterior. They employ art school students as part-time workers. If you use their technique, you can make any wall look like concrete uchihanashi.

You can also buy concrete uchihanashi wallpaper for normal interiors. It’s kind of dumb, but very Japanese.

Most normal buildings use tiles or plaster/stucco or paint the concrete exterior. Just leaving the concrete as is, it should be cheap, but lately, you need to either put a clear coating material (to keep the concrete clean) or repair it through things like the Yoshida Method. So it’s actually not as cheap as you think.

Jean SNOW
December 13, 2007

Jean Snow lives and breathes design and pop culture in Tokyo — sustained by an unhealthy addiction to magazines and frequent visits to his favorites cafes. His personal website is located at jeansnow.net.