A renovated 121.56㎡ unit in Yoyogi (代々木) 5-chome, Shibuya-ku (渋谷区) listed in April 2026 at ¥328,000,000, a per-square-metre rate of approximately ¥2.70 million. The building dates to 1983. That price would have been implausible for pre-bubble reinforced-concrete stock as recently as 2021. It is not implausible now, and understanding why requires a working knowledge of how Tokyo’s designer and architecturally renovated apartment segment actually operates, because it functions differently from anything most foreign buyers have encountered before.

What “Designer Apartment” Means in the Tokyo Market

The term covers two distinct product types that are frequently conflated. The first is purpose-designed new construction, where an architect of record shapes the building’s form, materials, and unit interiors from the ground up. Court Modelia Hiroo Tokyo, completed in July 2025 in Ebisu (恵比寿) 2-chome, Shibuya-ku, is a current example: the concrete façade and smart-lock entry system were designed by Taniuchida Akio, a multiple Good Design Award winner, and the building sits seven minutes on foot from Hiroo (広尾) station.

The second type is the architecturally renovated resale unit, sometimes called a リノベーション・マンション (renovation manshon, where マンション, or manshon, refers to a freehold condominium in Japanese usage, not a mansion in the English sense). Here, a developer or design firm acquires an existing unit in a well-located building, strips it to the concrete shell, and rebuilds the interior to a specification that would not look out of place in a Minotti showroom. R100 tokyo, working with Junio Design and architect Hashimoto Jun, executed exactly this on two adjacent units in the Yoyogi 5-chome building referenced above. The renovation included full replacement of water supply, drainage, and gas pipework, plus thermal insulation upgrades, items that are now standard disclosure items in any pre-1990 building and that foreign buyers should verify line by line in the 重要事項説明 (juuyou-jikou-setsumei, the statutory pre-contract disclosure meeting).

For buyers at the upper end, a third sub-type exists: the named-designer interior commission. Opus Arisugawa (オパス有栖川), a 2004 SRC/RC building in Minami-Azabu (南麻布), Minato-ku (港区), contains a 221.12㎡ unit whose interiors were designed by Gwenaël Nicolas, otherwise known for the common areas of GINZA SIX. It was his sole residential commission. Units with that kind of provenance documentation, what the market calls 設計者証明 (sekkei-sha-shōmei, designer attribution records), trade faster and at wider premiums than generic renovations. Preserving that documentation is a practical resale consideration, not a vanity one.

Where Prices Are in April 2026

The Yoyogi 5-chome listings provide a useful calibration. The 121.56㎡ unit (3LDK with walk-in closet and pantry, second floor of four) is listed at ¥328,000,000, inclusive of consumption tax on the building portion. An adjacent unit in the same building at 116.92㎡ with an additional spare room of 19.97㎡ is listed at ¥348,000,000, a unit rate of approximately ¥2.98 million per square metre. Both are managed by Mitsui Fudosan Residential Service.

For context on the broader market, comparable Minami-Azabu units above 200㎡ in buildings with concierge services and named-architect interiors trade in a range of roughly ¥600 million to ¥1.2 billion. The Opus Arisugawa unit, now listed as a rental after its sale, sits in that bracket.

Monthly holding costs are a figure foreign buyers consistently underestimate. The Yoyogi unit carries 管理費 (kanrihi, the monthly building management fee) of ¥47,040 plus 修繕積立金 (shūzen tsumitate-kin, the long-term repair reserve contribution) of ¥28,080, totalling ¥75,120 per month. That is moderate for a 121㎡ unit. Trophy buildings in Minami-Azabu and Hiroo with 24-hour concierge, CCTV systems, and English-speaking front desks routinely run ¥150,000 to ¥300,000 per month in combined fees. These costs are not deductible for owner-occupiers, though they are deductible against rental income if the property is leased.

For a broader overview of how purchase prices vary by building height and ward across the city, the Koukyuu guide to high-rise apartments in Tokyo provides ward-by-ward data current to 2026.

The Embassy-Belt Micro-Market: Why It Matters for Foreign Buyers

Yoyogi 5-chome and Minami-Azabu share a description that appears repeatedly in Japanese property listings: 大使館が立ち並ぶ閑静な邸宅街, meaning a quiet residential district lined with embassies. This is not marketing copy. It describes a specific and practically useful set of conditions.

Buildings in these micro-markets tend to have English-speaking management staff, because the tenant pool has historically included diplomats, senior expatriate executives, and international school families. International schools, including the German Swiss International School in Hiroo and the French school in Ebisu, sit within walking distance of multiple listings in this belt. That combination, English-capable building management plus international school proximity plus a diplomatic tenant pool, matters both for daily quality of life and for rental yield if the owner relocates.

The embassy-belt corridor runs roughly from Nishi-Azabu (西麻布) through Minami-Azabu, Hiroo, and into Yoyogi 5-chome and Uehara (上原). Properties in this corridor have consistently outperformed the broader Minato-ku and Shibuya-ku average on a per-square-metre basis over the past three years, and the designer/renovated sub-segment within it has outperformed the corridor average.

Tax and Regulatory Obligations Foreign Buyers Must Understand

Owning a designer apartment in Tokyo as a foreign national carries obligations that differ from ownership structures in most Western markets, and the differences are specific enough that they warrant detailed attention before any purchase.

固定資産税 (kotei shisan-zei, fixed-asset tax) is levied at a standard rate of 1.4% of the property’s assessed value, known as 課税標準額 (kazei hyōjun-gaku). Residential units receive a one-sixth reduction on the land portion for lots of 200㎡ or less. Assessed values in Minami-Azabu and Yoyogi rose again in 2025, as reflected in the 路線価 (rosen-ka, the official road-frontage land valuations published annually by the National Tax Agency). In addition, 都市計画税 (toshi keikaku-zei, city planning tax) applies at 0.3% of assessed value across all urbanisation promotion areas, which includes every neighbourhood discussed in this article.

For non-resident owners who lease their property, rental income paid to a non-resident is subject to 20.42% withholding at source under Article 212 of the Income Tax Act (所得税法 第212条). Before completing a purchase, non-resident buyers must appoint a 納税管理人 (nōzei kanri-nin, a designated tax agent in Japan) to handle filing obligations. This is a legal requirement, not optional, and the appointment should be made before the 登記 (touki, the transfer of legal title recorded at the Legal Affairs Bureau) is completed.

For buyers who are not yet permanent residents, the 永住権 (eijuuken, Japanese permanent residency) question is relevant to mortgage access. Most Japanese banks will extend mortgage financing to permanent residents and to holders of certain long-term visas, but the terms, required down payment, and available loan-to-value ratios vary significantly by institution. Non-residents purchasing without a Japanese mortgage will typically fund through offshore structures or cash. A full breakdown of purchase costs, taxes, and layout conventions is available in the Koukyuu article on Tokyo apartments for sale in 2026.

Due Diligence Specific to the Designer and Renovated Segment

Designer apartments carry a layer of due diligence that standard resale units do not. Four items deserve particular attention.

Renovation scope and permit records. A full renovation that includes structural work, pipe replacement, or changes to fire-compartment walls requires building permits (建築確認申請, kenchiku kakunin shinsei). Buyers should confirm that permits were obtained and that the completed work matches the approved drawings. Unpermitted alterations can complicate future resale and, in some cases, affect the building’s compliance status. 管理組合 (kanri kumiai, the owners’ association) records. The repair reserve balance and the long-term repair plan (長期修繕計画, chōki shūzen keikaku) are disclosed in the juuyou-jikou-setsumei, but buyers should also request the most recent general meeting minutes. A building with a depleted repair reserve or a deferred major repair cycle will eventually require a special assessment (臨時修繕積立金, rinji shūzen tsumitate-kin), and that cost falls on all unit owners at the time of the levy. Designer attribution documentation. As noted above, named-architect provenance is a liquidity driver. Buyers should request copies of the design contract or attribution letter and retain them with the property file. Seismic compliance. Japan’s new seismic standard (新耐震基準, shin-taishin kijun) came into effect in June 1981. Buildings completed before that date were built to the old standard. The Yoyogi 5-chome building, completed in 1983, meets the new standard. Any pre-1981 building should be assessed for seismic retrofit status before purchase.

At Koukyuu, a licensed 宅建士 (takken-shi, Japan’s licensed real-estate transaction specialist) personally manages every stage of the engagement, from the initial brief through due diligence, the juuyou-jikou-setsumei, negotiation, and signing. Most Tokyo agencies route clients through unlicensed salespeople until the closing day and bring in a takken-shi only for the statutory disclosure meeting. The distinction matters most precisely in the designer and renovated segment, where the due diligence checklist is longer and the documentation requirements are less standardised.

Choosing a Neighborhood: Three Distinct Profiles

Foreign buyers focused on designer apartments in Tokyo’s central wards are generally choosing among three neighborhood profiles, each with a different price point, tenant pool, and daily-life character.

Minami-Azabu and Hiroo (Minato-ku and Shibuya-ku border). The deepest concentration of large-format, concierge-serviced buildings with named-architect interiors. Units above 150㎡ in this corridor trade from approximately ¥500 million upward. The Hiroo supermarket, multiple embassies, and the Arisugawa-no-Miya Memorial Park are within walking distance of most buildings. English is widely spoken at building reception desks. Yoyogi 5-chome and Uehara (Shibuya-ku). A quieter residential character than Minami-Azabu, with a younger design-oriented buyer profile. The R100 tokyo listings at ¥328 million to ¥348 million represent the current entry point for fully renovated large-format stock here. Yoyogi-Hachiman station is a short walk; Shinjuku is four minutes by Odakyu line. Nishi-Azabu and Roppongi Hills adjacency (Minato-ku). Higher density, more mixed use, and closer to Roppongi’s commercial core. Buyers here typically prioritize walkability to restaurants and galleries over the quieter residential character of the Hiroo corridor. Designer new-build towers in this pocket start above ¥1 billion for units above 100㎡.

For buyers comparing unit layouts across these neighborhoods, the Koukyuu guide to Japanese apartment layout terminology explains the LDK, WIC, and SIC conventions used in Japanese listing documents.

Koukyuu is a private buyer’s advisory for distinguished Tokyo residences in Nishi-Azabu, Minami-Azabu, Hiroo, and Roppongi Hills, focused exclusively on transactions of ¥300 million and above. A licensed 宅建士 (takken-shi) personally handles every stage of the engagement, from the first consultation to the signing, and you can book a private consultation) to begin.