Topic & Methodology
This original article investigates a newsworthy topic using the issuer's materials and our data. The materials used are listed under “Sources and passages reviewed.”
AI drafted this article from the source announcement and this site's data. Citations and figures were checked, with a separate AI call used for cross-checking. Verifiable facts are presented separately from conditional analysis, but these checks do not guarantee accuracy. This is neither a guarantee of future prices or returns nor a recommendation to buy or sell.
What the Source Confirms
The release's population and price indicators
Mansion Research Co., Ltd. says it aggregated asking-price data for existing properties circulating in the market in Tokyo's three central wards and analyzed 51,744 cases. [1][2]
According to the release, per-tsubo prices on newly registered listings began trending downward around the second half of 2025, while per-tsubo inventory prices peaked in the first half of 2026 and have since remained broadly flat. [3][4]
Transaction prices per tsubo have edged down since early 2026. Discount rates and marketing periods began trending upward around mid-2024, reached what the release calls extremely high levels in the latest month, September 2026, and inventory is said to be increasing. [5][6][7]
What the Source Confirms
Chiyoda tower sale and rental listings and price revisions
Our figures include 23 published buildings at least 20 stories tall in Chiyoda Ward. The median 2026 price at the nearest officially published land-price survey point was ¥14.017 million/tsubo, with a median year-on-year change of +10.7%. Prices rose at all 22 of the 22 buildings for which a year-on-year change could be calculated. [8][9]
There were 70 units listed for sale, with a median asking price of ¥12.666 million/tsubo, and 52 listed for rent, with a median asking rent of ¥22,972/tsubo per month. [10][11]
Price revisions observed from 2026-10-07 through 2026-10-13 comprised 4 reductions and 0 increases for sale listings, and 3 reductions and 1 increase for rental listings. [12]
Conditional Analysis
Conditions governing rent, ownership costs, and cash flow
The ¥22,972/tsubo monthly median asking rent for Chiyoda tower units is a listing-stage level and does not directly indicate actual net income. Our investment metric estimates a monthly amount by subtracting management fees, repair reserve contributions, loan repayments, estimated property taxes and similar charges, and property-management fees from rent adjusted for assumed occupancy, so cash flow cannot be judged from headline rent alone. [11][13]
Units whose listings do not state management fees or repair reserve contributions are excluded rather than calculated with ¥0 costs, so units without disclosed costs may not appear in cash-flow comparisons. Prospective buyers cannot assess monthly cash flow without checking management fees, repair reserve contributions, and loan terms for each unit in addition to rent. [14]
Conditional Analysis
Thinking about sale discounts and marketing periods
If inventory continues to rise, pressure for price adjustments intended to improve the supply-demand balance could strengthen further. Owners planning a sale may face longer marketing periods the longer they hold an asking price unchanged, making the need for a price review a relevant consideration. [15]
Not every property will necessarily adjust by the same amount. If differences in valuation widen according to location, age, grade, views, and management condition, resale value within Chiyoda's tower market must also be assessed building by building and unit by unit. [16]
Limitations & Points to Verify
Different populations and dates, and information requiring further review
Mansion Research's release aggregates asking-price data for existing for-sale condominiums and is not limited to tower condominiums. Our Chiyoda tower figures are a snapshot of buildings at least 20 stories tall. Because the populations and dates differ, the two should not be used to calculate a direct rate of price change or yield. [8][1]
A separate Mercury release on new condominium trends concerns sales results for July 2026 and covers the Greater Tokyo and Kansai regions. Because it covers new construction, it does not directly test price adjustments among existing central Tokyo properties or circulation of Chiyoda tower units. [17][18]
Our investment metric does not account for interior condition, views, management condition, repair plans, or other factors unavailable from listings. Median asking rents and sale prices for Chiyoda towers therefore cannot by themselves determine an individual unit's cash flow or future resale value. [19]
Management bylaws, repair-reserve plans, the strength of rental demand, exit marketing periods, and other information absent from the materials cannot be established here, so prospective buyers need property-specific follow-up. [14]
Sources and passages reviewed
Research and opinions belong to their respective publishers. Citations establish the basis of the analysis and do not guarantee future results.
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マンションリサーチ株式会社
東京都都心3区所在の中古分譲マンション
Collected and aggregated:2026-10-13 11:21 (Japan time)
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マンションリサーチ株式会社
事例総数：51,744件
Collected and aggregated:2026-10-13 11:21 (Japan time)
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マンションリサーチ株式会社
新規登録坪単価については2025年後半頃から減少傾向が見られます
Collected and aggregated:2026-10-13 11:21 (Japan time)
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マンションリサーチ株式会社
2026年前半をピークとして、その後は概ね横ばい
Collected and aggregated:2026-10-13 11:21 (Japan time)
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マンションリサーチ株式会社
成約坪単価についても、2026年初旬以降は微減傾向が確認されます
Collected and aggregated:2026-10-13 11:21 (Japan time)
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マンションリサーチ株式会社
値引率、販売日数ともに2024年中盤頃から上昇傾向に入り、特に直近の2026年9月においては
Collected and aggregated:2026-10-13 11:21 (Japan time)
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マンションリサーチ株式会社
在庫は増加傾向にあります
Collected and aggregated:2026-10-13 11:21 (Japan time)
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TOWERS.SELECT Aggregation
千代田区のタワーマンションのデータ：千代田区で当サイトが棟ページを公開している地上20階以上の建物は23棟。
Collected and aggregated:2026-10-13 11:21 (Japan time)
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TOWERS.SELECT Aggregation
千代田区のタワーマンションのデータ：これらの建物に最も近い地価公示の地点（2026年）の価格は、中央値で1,401.7万円/坪。前年比の中央値は+10.7%で、前年比を計算できた22棟のうち22棟で最寄りの地点が上昇している。
Collected and aggregated:2026-10-13 11:21 (Japan time)
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TOWERS.SELECT Aggregation
千代田区のタワーマンションのデータ：売出中の住戸は70戸で、坪単価の中央値は1,266.6万円/坪（2026-10-13時点、標本70戸）。
Collected and aggregated:2026-10-13 11:21 (Japan time)
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TOWERS.SELECT Aggregation
千代田区のタワーマンションのデータ：賃貸募集中の住戸は52戸で、坪賃料の中央値は22,972円/坪・月（2026-10-13時点、標本52戸）。
Collected and aggregated:2026-10-13 11:21 (Japan time)
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TOWERS.SELECT Aggregation
千代田区のタワーマンションのデータ：2026-10-07から2026-10-13までに確認した価格改定は、売買で値下げ4戸・値上げ0戸、賃貸で値下げ3戸・値上げ1戸。
Collected and aggregated:2026-10-13 11:21 (Japan time)
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Assumptions Behind TOWERS.SELECT's Investment Metrics
想定の稼働率を反映した賃料から、管理費・修繕積立金・ローン返済・固定資産税等の概算・管理委託費を引いた月額。
Collected and aggregated:2026-10-13 11:21 (Japan time)
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Assumptions Behind TOWERS.SELECT's Investment Metrics
管理費や修繕積立金が掲載に書かれていない住戸は、0円として計算せず、対象から外している。
Collected and aggregated:2026-10-13 11:21 (Japan time)
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マンションリサーチ株式会社
価格調整圧力はさらに強まる可能性があります
Collected and aggregated:2026-10-13 11:21 (Japan time)
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マンションリサーチ株式会社
すべての物件が一律に価格調整するとは限りません
Collected and aggregated:2026-10-13 11:21 (Japan time)
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PR TIMES（企業の発表）
2026年7月度分譲実績データです
Collected and aggregated:2026-10-13 11:21 (Japan time)
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PR TIMES（企業の発表）
集計対象エリアは首都圏及び関西
Collected and aggregated:2026-10-13 11:21 (Japan time)
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Assumptions Behind TOWERS.SELECT's Investment Metrics
室内の状態、眺望、管理の状況、修繕の計画など、掲載から読み取れない条件は反映していない。
Collected and aggregated:2026-10-13 11:21 (Japan time)
Check the Latest Data
Figures in this article are as of 2026-10-13.
- Buildings in Chiyoda Ward
- Market Trends in Chiyoda Ward
- Homes with Price Changes and New Listings
- All Announcements & Data
Land values were compiled by TOWERS.SELECT from the Ministry of Land, Infrastructure, Transport and Tourism's National Land Numerical Information on published land prices. Unit prices are asking prices shown in public listings, not closed prices.