Why Tokyo Mansion Prices Haven't Dropped Yet — Decoding the April 2026 REINS Supply-Demand Data

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Tokyo’s real estate market is passing through a strange season. Transactions are falling. Unsold inventory is piling up. And yet — prices are rising. Or more precisely: prices are not coming down.

The April 2026 REINS (East Japan Real Estate Distribution Organization) data puts this contradiction into numbers.¹ The number of closed transactions for used mansions in Tokyo Metropolis fell -6.7% year-on-year to 2,008 units. Over the same period, inventory grew +8.9% to 25,139 units sitting on the market. Demand retreating, supply swelling — the textbook setup for falling prices. Yet the contracted price per ㎡ rose +8.9% to 122.68万円 per ㎡.

Demand -6.7%, inventory +8.9%, prices +8.9%. The fact that all three numbers hold simultaneously is the central puzzle of today’s Tokyo mansion market.

Why Prices Are Holding

Simply put: sellers are not cutting their asking prices. A structural feature of Japan’s real estate market is that once a seller sets a list price, they rarely lower it. Loss-aversion psychology runs deep, and the tax advantages of long-term holding create a judgment that “there’s no urgent reason to sell now.” The result is a market where transactions dry up while prices hold — what might be called a “vanishing transactions + rigid asking prices” regime.

Nowhere is this more visible than in the three central wards. Inventory in Chiyoda, Chuo, and Minato wards surged +43.0% year-on-year in April 2026.¹ The fact that listings are accumulating at this speed in the city’s most premium districts — where foreign investment demand was concentrated — signals that “buy-side” demand has essentially evaporated. Yet asking prices remain stubborn. This is the structural backdrop that keeps the market-wide average price in positive territory.

Heat Spreading to the Suburbs — The Second Wave of Tokyo’s Price Surge

It is telling that the transaction decline across the greater metropolitan area (-1.2%) is far smaller than Tokyo Metropolis alone (-6.7%). The gap is being filled by suburban prefectures. Saitama +6.2%, Chiba +6.6%, Kanagawa +4.4%. Inventory in the suburbs is simultaneously falling (-4 to -5%).¹

Reading this simply as a “flight from Tokyo” misses the context. After years of sharp appreciation in central Tokyo, the entry barrier has risen dramatically. Demand that can no longer afford central Tokyo is migrating to relatively more affordable suburbs — a classic spillover pattern. It is structurally similar to the Seoul dynamic where Gangnam price surges pushed buyers toward Ma-Yong-Seong neighborhoods, then outward to the broader metropolitan ring. Tokyo’s core price escalation is displacing demand to Saitama, Chiba, and Kanagawa, where that demand now shows up as actual closed transactions. The metropolitan average holding up reflects outer-area activity offsetting Tokyo’s slowdown.

Conditions That Would Break the Rigidity

This price rigidity cannot last forever. A combination of several conditions would trigger a transition toward unwinding.

First: interest rates. The BOJ policy rate currently sits at 0.75%, frozen for three consecutive meetings,² but 3 of the 9 Policy Board members have already argued forcefully for a 1.0% hike. The next BOJ meeting is June 16. Even if June brings a hold — which is the likely outcome — the possibility of one to two additional hikes thereafter is realistic. Strip out the energy subsidy effect and core-core CPI is 1.9%; food prices have risen 4.1%.³ Inflationary pressure is alive beneath the policy optics. That said, Japan’s economic resilience may struggle to absorb consecutive hikes, and if Middle East tensions ease and oil supply normalizes, inflation concerns could subside in tandem. A rate-hike cycle confined to a limited range seems the more probable outcome.

Second: cooling in the new-build market. Against the Real Estate Economic Institute’s threshold of 70% initial contract rate — the benchmark for a healthy new-build market — the greater Tokyo area reached only 62.3% for new mansions in April 2026. When new builds fail to sell, developers’ pricing adjustment pressure eventually transmits into the used-home market as well.

Third: inventory absorption limits. The +43% inventory surge in the three central wards is an exceptional reading. The longer unsold inventory sits, the more accumulating interest expense and management fees push each successive owner to begin cutting asking prices. If inventory growth continues at this pace, that pressure could show up in actual transaction prices within the second half of this year.

Compared to Seoul — Tokyo’s Relative Price Advantage

Stepping back at this juncture reveals a different picture. Placing Tokyo and Seoul side by side — two cities of comparable economic heft — Tokyo real estate still sits at a structurally attractive price level.

The price per pyeong in Gangnam-gu, Seoul reached approximately 1億570万원 (about KRW 105.7 million) as of 2025. The Seoul-wide average is around 5,400万원. By contrast, Tokyo’s contracted price per ㎡ for used mansions of 122.68万円 translates to roughly 405万円 per pyeong (3.3 ㎡) — approximately 3,850万원 per pyeong at current exchange rates.¹ Central Tokyo sits below the Seoul-wide average, and at roughly one-third of Gangnam levels.

One-to-one comparisons have limits, of course. Rental yield structures, property tax regimes, maintenance cost burdens, and acquisition processes for foreign buyers all differ. Even so, the persistence of this price gap between two capitals of similarly-sized economies remains a substantive argument that Tokyo real estate is still in a structurally undervalued range on a global basis. This is precisely why foreign capital and J-REIT demand continue to target central Tokyo with such tenacity.

The current phase — inventory building and transactions falling — is uncertain, but it does not erase Tokyo real estate’s structural undervaluation thesis. How one reads the short-term price rigidity unwinding window is the crux of entry timing.

How to Read This Market Right Now

Three practical takeaways.

If you are considering a purchase: right now is a period when the gap between asking prices and actual transaction prices is widening. Within the same building, bargain-priced urgent-sale units and price-rigid listings coexist. Do not be fooled by the aggregate contracted ㎡ price being up — tracking the actual transaction prices of individual units comes first.

If you are a current holder: pay close attention to the pace of inventory growth. Central three-ward +43% is an exceptional reading. The longer listings sit, the more asking price adjustments eventually follow. If you need short-term liquidity, now may actually be the right selling window.

If you are on the sidelines: watching the BOJ decision on June 16 alongside next month’s REINS June 2026 issue together is the recommended approach. If three consecutive months of transaction declines + accelerating inventory + rate hike converge simultaneously, the odds of the price rigidity showing visible cracks rise significantly.

The Counter-Hypothesis — “Prices Could Go Higher”

Of course, a scenario exists where this analysis is wrong. If yen weakness persists or deepens further, foreign investment demand could once again concentrate on premium central listings. And if the BOJ concludes its rate-hike cycle faster than expected and returns to an accommodative stance, the short-term rate burden disappears. Even as inventory builds, the narrative of premium location scarcity is alive — top-tier central properties can move on entirely separate logic, a factor not to be dismissed.

But for this counter-scenario to hold, three conditions must be satisfied simultaneously: renewed yen depreciation, an early end to the BOJ hiking cycle, and a rekindling of foreign buyer demand. At present, the realistic weight sits more on the side where even a single missing condition causes the rigidity to crack.

The Rational View at This Juncture

Tokyo mansion prices have not dropped yet. But the reason is not that the market is strong — it is that sellers are holding out. Demand has already receded. Inventory is accumulating. Interest rates, however modestly, are pointing higher. Price rigidity is drawing closer to a state from which it could break at any time.

That said, the fact that Tokyo remains in a structurally undervalued range relative to Seoul does not change. The current supply-demand imbalance is a short-term risk; the price gap with Seoul is a medium-to-long-term structural advantage. Reading both simultaneously is the rational lens through which to view Tokyo real estate today.