The 公示地価 (kojichika, Japan’s official land price survey), published by the 国土交通省 (Ministry of Land, Infrastructure, Transport and Tourism) each March, registered its highest national average increase since the bubble era when the 2025 figures landed: residential land in 港区 (Minato-ku) rose 12.7% year-on-year, up from 7.2% in 2024, and cumulative gains over five years now approach 50%. That single data release, combined with April’s arrival of 固定資産税 (kotei shisan-zei, fixed-asset tax) notices in property owners’ mailboxes, has made the spring of 2025 one of the more consequential moments for Tokyo real estate in recent memory. For foreign buyers weighing an entry, the confluence of tax mechanics, rate normalization, and structural demand shifts makes the timing worth understanding in precise terms.

What the 2025 Land Price Survey Actually Says

The 2025 公示地価, with a reference date of January 1, 2025, covers 26,000 standard survey points across Japan. The headline national all-use average rose 3.4% year-on-year, the strongest reading since the early 1990s. At the ward level, the numbers are sharper: 渋谷区 (Shibuya-ku) residential land appreciated approximately 12.5% over the same period, tracking closely with Minato-ku’s 12.7%. Nationally, 65% of standard residential survey points recorded rising valuations, a breadth figure that signals the recovery is no longer confined to a handful of central Tokyo addresses.

For foreign buyers, the survey matters beyond headline optics. The 公示地価 feeds directly into the 路線価 (rosenka, the road-frontage assessed value published annually by the 国税庁, National Tax Agency, each July), which in turn forms the basis for 相続税 (souzoku-zei, inheritance tax) calculations on land. As market prices surge, the traditional gap between rosenka and actual transacted value narrows, compressing the estate-planning arbitrage that has historically made Tokyo real estate attractive to Japanese asset-holders. That compression is now prompting some long-term domestic owners to reconsider their hold positions, adding measured supply to a market that has been structurally undersupplied at the luxury end.

The 2024 路線価 placed Ginza (銀座) 5-chome land at ¥4,424,000 per square metre, a record. The 2025 figure, due in July, is widely expected to move higher.

April’s Tax Notices and the 評価替え Cycle

April is when the tax calendar becomes visceral. The 賦課期日 (fukazeibi, assessment date) for 固定資産税 is January 1 each year, and bills covering all property owned as of January 1, 2025 are now reaching owners. The standard rate is 1.4% of the 課税標準額 (kazei hyoujun-gaku, taxable assessed value). In Tokyo’s 23 wards, which fall within 市街化区域 (urbanization promotion zones), the 都市計画税 (toshi keikaku-zei, city planning tax) adds up to 0.3% on top of that.

For a foreign buyer holding a マンション (manshon, Japanese usage for a freehold condominium, distinct from the English word ‘mansion’) in Minato-ku with a ¥200 million market value, the combined annual 固定資産税 and 都市計画税 bill typically falls in the range of ¥700,000 to ¥1,000,000 or more, depending on the assessed value and floor ratio. These are not trivial carrying costs, and they are rising.

The triennial 評価替え (hyouka-gae, property revaluation cycle) was conducted in 2024. The next is scheduled for 2027. The 2024 reassessment raised the revaluation coefficient for 木造住宅 (wooden-frame housing) from 1.04 to 1.11, reflecting post-pandemic construction cost inflation. More consequentially, the 負担調整措置 (futan chousei sochi, burden-adjustment mechanism) phases in assessment increases gradually rather than in a single step, which means tax bills will continue climbing for several years even if land prices plateau. Foreign buyers should model this trajectory, particularly those acquiring properties in central wards where assessed values have the furthest to travel toward market levels.

One relief that foreign buyers should understand clearly: the 住宅用地特例 (juutaku youchi tokurei, residential land preferential assessment) reduces the taxable assessed value of land under housing to one-sixth of its value for plots up to 200 square metres, and one-third for larger plots, for 固定資産税 purposes. Foreign buyers holding vacant land or non-residential property do not benefit from this reduction. Policy discussions are ongoing about whether to narrow the preferential ratio from one-sixth to one-third for all residential land, a change that would effectively double the tax burden for most residential landholders. The 縦覧 (juuiran, public inspection period) runs April 1 through June 30, 2025, during which Tokyo 都税事務所 (metropolitan tax offices) allow property owners to inspect their land and building valuations for the first time this calendar year.

For a fuller breakdown of how these tax mechanics interact with purchase timing and hold-period strategy, the Koukyuu editorial on Tokyo property hold periods and what the 2026 tax reform means for foreign buyers covers the statutory framework in detail.

The 億ション Market and Structural Demand

The luxury segment is no longer a niche. 億ション (oku-shon, condominiums priced at ¥100 million or above) represented 2.6% of Tokyo’s secondary-market condominium transactions in 2019. By 2025, that share had risen to 15.0%, meaning roughly one in seven resale units now trades above ¥100 million. The underlying demand is domestic as well as foreign: Japan’s population of 富裕層世帯 (HNW households, defined as net financial assets of ¥100 million or more) reached approximately 1.65 million households as of 2023, a record high according to 野村総合研究所 (Nomura Research Institute).

Foreign capital has added a distinct layer. Buyers from Hong Kong, Singapore, and mainland China have been active acquirers of Tokyo tower condominiums and penthouses, drawn by three converging factors: yen depreciation that held the USD/JPY rate in the ¥150 to ¥155 range through early 2025, Japan’s political stability as a safe-haven asset location, and Tokyo gross yields of 3% to 4% that remain above comparable gateway cities across Asia. A 2024 survey cited by the Japan Real Estate Institute found that 87.5% of Chinese-sphere investors believed the timing was right to buy Japanese real estate. Tokyo’s appeal to global capital has been documented in detail by Nikkei Asia, which tracked the acceleration of foreign inflows through the second half of 2025.

For foreign buyers, the practical implication is that the competitive set at the top of the market has broadened. A Nishi-Azabu (西麻布) penthouse or a Roppongi Hills (六本木ヒルズ) residence-tower unit is now being evaluated simultaneously by domestic HNW buyers, Japanese institutional money, and overseas capital. Waiting for a correction that most structural indicators do not support carries its own risk.

BOJ Rate Normalization and What It Means for Buyers

The 日本銀行 (Bank of Japan) raised its policy rate to 0.5% in January 2025, formally closing the chapter on negative interest rates. For leveraged investors, floating-rate mortgage costs have begun to move, and the recalibration of cap rates and yield expectations is working through the broader market in real time. The luxury segment, where cash buyers dominate, is less directly exposed to financing cost pressure. A buyer acquiring a ¥500 million residence in Azabu (麻布) or Hiroo (広尾) without leverage is not repricing their acquisition cost based on a 25-basis-point move.

The rate shift matters more indirectly. As leveraged mid-market investors face higher carrying costs, some will exit positions, adding inventory in the ¥50 million to ¥150 million range. That dynamic does not directly affect the ¥300 million-plus segment, but it does clarify the segmentation: the top of the market is increasingly insulated from the financing mechanics that drive activity in the broader condominium market.

For non-resident foreign buyers, mortgage access remains a separate and more constrained question. Most Japanese lenders require either 永住権 (eijuuken, Japanese permanent residency) or a domestic income source as a prerequisite for a yen-denominated mortgage. Buyers without PR status typically acquire with overseas financing or cash. This is a structural feature of the market, not a temporary restriction, and it shapes the buyer pool at the luxury end in ways that are worth understanding before beginning a property search. The Koukyuu article on real estate investment in Japan in 2026, covering tax law, pricing, and what foreign buyers must know addresses mortgage access for non-residents alongside the broader acquisition framework.

Risk Factors Foreign Buyers Should Price In

The market has genuine tailwinds, and the data above reflects them accurately. It also carries risks that are specific to the Japanese statutory environment and that foreign buyers without prior Japan context are likely to underestimate.

The first is the 空き家特例解除 (akiya tokurei kaijo, the cancellation of the residential land tax preferential assessment for designated vacant or poorly managed properties). A property designated as a 特定空家 (tokutei akiya, specified vacant property) or 管理不全空家 (kanri fuzen akiya, inadequately managed vacant property) loses the one-sixth residential land reduction overnight, causing the 固定資産税 bill to jump as much as sixfold. Foreign buyers who spend extended periods outside Japan and leave properties unoccupied face a non-trivial designation risk.

The second is the non-resident withholding obligation. Under Article 161 of the 所得税法 (Income Tax Act), foreign sellers are subject to 10.21% withholding on gross sale proceeds. Critically, the withholding obligation falls on the buyer: if you purchase a property from a non-resident seller and fail to withhold and remit the tax, the liability is yours. This is a point that frequently surprises foreign buyers who have transacted in other markets and assume the seller handles their own tax obligations. It is also a reason why having a 宅建士 (takken-shi, Japan’s licensed real-estate transaction specialist) personally managing due diligence and contract mechanics matters at every stage of a transaction, not only at closing.

The 2027 評価替え will capture the price gains of 2024 through 2026, producing another step-up in assessed values and, through the 負担調整措置 phase-in, further tax bill increases through the late 2020s. Buyers acquiring now should model holding costs on a rising trajectory, not a static one.

Finally, the inheritance tax dynamic cuts both ways. The narrowing gap between 路線価 and market value reduces the estate-planning benefit of holding Tokyo real estate, but it is also prompting long-term Japanese owners to sell, which is adding supply at price points that have historically seen very little turnover. That supply, modest as it is, is creating acquisition opportunities in buildings and addresses that rarely transact. Asahi Shimbun’s reporting on the surge in individual investor activity through late 2025 captures how this dynamic is playing out across the market.

What Foreign Buyers Should Do With This Information

The April 2025 moment is useful precisely because it concentrates several normally diffuse signals into a single calendar period. The 公示地価 data is fresh. Tax bills are arriving. The BOJ’s rate posture is newly established. The 2024 評価替え is flowing through assessed values for the first time. Together, they give a buyer a relatively clear picture of where carrying costs are heading and why.

For a foreign buyer at the ¥300 million-plus level, the practical checklist is specific. Confirm whether the target property’s seller is resident or non-resident, and understand the withholding mechanics before signing any 売買契約書 (baibai keiyakusho, purchase and sale agreement). Review the current 固定資産税 bill for the property, ask for the 課税標準額 breakdown, and model the 2027 reassessment impact. Understand whether the property’s land qualifies for the 住宅用地特例 and at what ratio. Verify the property’s vacancy status and management condition to assess 空き家 designation risk. And confirm that the 重要事項説明 (juuyou-jikou-setsumei, the statutory pre-contract disclosure meeting) will be conducted by a licensed 宅建士 who has been present throughout the process, not introduced only at the closing table.

These are not bureaucratic formalities. Each one carries direct financial consequence, and in a market moving at the pace Tokyo’s luxury segment is moving, errors in any of them are expensive to correct after the 手付金 (tetsuke-kin, the earnest-money deposit, typically 10% of the purchase price) has been paid.

Koukyuu is a private buyer’s advisory for distinguished Tokyo residences in Azabudai Hills (麻布台ヒルズ), Nishi-Azabu, and Omotesando (表参道), focused exclusively on transactions of ¥300 million and above, with a licensed 宅建士 personally handling every stage of the engagement from the first consultation through 登記 (touki, the transfer of legal title recorded at the Legal Affairs Bureau). Book a private consultation) to begin a confidential conversation about your acquisition brief.