再開発が優先してきたものを、いま問い直す。建築家・山本理顕氏に聞いた。

Feature | 2026.8.20


工費が上がった。人が足りない。採算が合わない。
都心の再開発が止まった理由は、そう説明される。問題はそれだけだろうか。

住む人より投資する人、街の記憶より売れる床。再開発が優先してきたものを、いま問い直す。
建築家・山本理顕氏に聞いた。

Rising costs, labor shortages, low profits.
That is how halted Tokyo redevelopments are explained. …Is that all?
Investors over residents, sellable space over city memory.
We rethink these priorities.
An interview with architect Riken Yamamoto.

『再開発は、真面目にやらなきゃダメですよ。』

“Redevelopment must be taken seriously”


—What are your thoughts
 on current stalled urban redevelopments in central Tokyo?


In short, it is because people aren’t taking it seriously—policymakers, developers, and architects alike. When using vast funds and altering cityscapes, you must be serious.
Originally, architecture had laws and regulations to prevent reckless building. Today, people figure out how to bypass those grids to build higher and larger. Authorities respond by easing rules. Consequently, instead of breaking laws, they use laws to maximize sellable floor area.
Behind this lies real estate securitization. Gathering money through funds, buildings are constructed not for residents or workers, but to raise investor yields. Architecture became a commodity that generates cash.
Naturally, more floor space is better, pushing height and size to the limit. But an architect’s job isn’t stacking floor area to legal boundaries. Even if legally permitted, if harmful to surroundings, keep it lower. Making tha tjudgment is the architect’s duty.
This stall isn’t caused by rising costs alone. Repeating the same mechanism led to its deadlock. Naturally, no method stays profitable forever.
Can paused plans restart as they were? I find that doubtful. Early investors will struggle. Honestly, I lack an immediate answer. Yet waiting for profitability just to build the same thing is clearly wrong.
Redevelopments offer plazas, decks, or green spaces, claiming “public value.” But a plaza alone doesn’t create public space. If filled with restrictions, as is common, it isn’t public. Space is public because we enter freely.
All architecture possesses public nature. Larger buildings alter surroundings and lives, carrying heavier duties. Profits aren’t bad. Developers should profit. Yet they must seriously ask who it serves and what stays in the city.
This pause is a good chance to rethink who redevelopment is for. If the answer is “for investors,” build nothing. A city belongs to no single owner.



©sekiguchitaketo

建築家
山本理顕氏(やまもと・りけん)



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都心よ止まれ。

yoff

VOL.31

都心よ止まれ。

止まった未来を前に、東京のこれからを考える、という話。

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