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Clearer Price Adjustment and Rising Rents at Waterfront Towers: Reviewing Yields After Ownership Costs

An analysis by a condominium AI valuation service found that AI-estimated prices for tower condominiums in the waterfront area had declined since the start of the year while rents rose, improving the yield measured on the same units. Owners and prospective buyers should review both resale value and rent while separately accounting for management fees, repair reserve contributions, and other ownership costs.

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

Published changes in waterfront tower prices and rents

MFS reported that the AI-estimated price of a 3LDK unit standardized to 70 m² fell −3.6% from January through September 2026 across 45 tower condominiums in five districts: Kachidoki, Tsukishima, Harumi, Toyosu, and Ariake. Rents rose +2.9% from January through September 2026 and increased at 43 of the 45 buildings. Gross yield measured on the same units improved from 2.76% to 2.95%. [1][2][3]

What the Source Confirms

Volume and price revisions in Tokyo's tower listing market

TOWERS.SELECT counted 3,119 tower units listed for sale in Tokyo's 23 wards, with a median asking price of ¥7.866 million/tsubo, and 2,764 units listed for rent, with a median asking rent of ¥20,079/tsubo per month. All figures describe the listing market as of 2026-10-13. [4][5]

Price revisions observed during the period comprised 355 reductions and 6 increases for sale listings, and 221 reductions and 9 increases for rental listings. [6]

Conditional Analysis

Read resale prices separately from rent

Across the 45 waterfront tower condominiums, AI-estimated prices fell −3.6% from January through September 2026 while rents rose +2.9%. Looking only at the sale-price adjustment can bring losses to the fore, but gross yield measured on the same units improved from 2.76% to 2.95%, making it useful to separate resale valuation from rental valuation. [1][2][3]

MFS commented that a reassessment had begun after prices rose ahead of fundamentals. If that view applies, the degree of adjustment at sale may differ by price band and building age. The materials do not, however, establish the reason for a price reduction on any individual unit. [7][8]

Conditional Analysis

Estimate yield improvement separately from ownership costs

Even though gross yield measured on the same units improved from 2.76% to 2.95%, it remains a gross yield calculated by dividing rent by price. Our investment metric estimates a monthly amount by subtracting management fees, repair reserve contributions, loan repayments, estimated property taxes and similar charges from rent adjusted for assumed occupancy. Whether a higher gross yield translates into more net cash therefore depends on each property's costs. [3][9]

Our estimates exclude units whose listings do not state management fees or repair reserve contributions. Evaluating actual net cash requires either estimating from a property with disclosed costs or confirming whether the listing provides that information. [10]

Limitations & Points to Verify

Limits created by different populations in AI valuations and other studies

CAPS figures are estimates based on AI valuations, not actual transaction prices. They should be treated as one input into an investment decision and not confused with asking prices or comparable transactions. [11]

A separate primary release by Mercury reported 1,134 units in circulation in Tokyo's 23 wards, an average price of ¥192.96 million for 70 m², and a year-on-year change of −4.6%. By contrast, the MFS release reported a +11.8% year-on-year change for Tokyo's 23 wards. The directions appear contradictory, but the study populations differ and cannot be compared directly. [12][13][14]

Mercury covers existing condominiums no more than 20 years old and at least 20 stories tall when circulated. CAPS's waterfront analysis covers 45 tower condominiums in five districts—Kachidoki, Tsukishima, Harumi, Toyosu, and Ariake—so its figures for all of Tokyo and for the five waterfront districts cannot simply be compared. Investors should determine which study population is closer to the property under consideration. [15][1]

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.

  1. PR TIMES（企業の発表）
    勝どき・月島・晴海・豊洲・有明の5地区にあるタワーマンション45棟では、3LDK（70㎡換算）のAI査定価格が2026年1月から9月までに−3.6%と下落しています

    Collected and aggregated:2026-10-13 17:29 (Japan time)

  2. PR TIMES（企業の発表）
    家賃は2026年1月から9月に＋2.9%と上昇し、45棟中43棟で上がりました

    Collected and aggregated:2026-10-13 17:29 (Japan time)

  3. PR TIMES（企業の発表）
    同じ住戸で測った表面利回りは2.76%→2.95%

    Collected and aggregated:2026-10-13 17:29 (Japan time)

  4. TOWERS.SELECT Aggregation
    東京23区のタワーマンションのデータ：売出中の住戸は3,119戸で、坪単価の中央値は786.6万円/坪（2026-10-13時点、標本3,119戸）。

    Collected and aggregated:2026-10-13 17:29 (Japan time)

  5. TOWERS.SELECT Aggregation
    東京23区のタワーマンションのデータ：賃貸募集中の住戸は2,764戸で、坪賃料の中央値は20,079円/坪・月（2026-10-13時点、標本2,764戸）。

    Collected and aggregated:2026-10-13 17:29 (Japan time)

  6. TOWERS.SELECT Aggregation
    東京23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355戸・値上げ6戸、賃貸で値下げ221戸・値上げ9戸。

    Collected and aggregated:2026-10-13 17:29 (Japan time)

  7. PR TIMES（企業の発表）
    期待先行で上がった価格の見直しが始まっていると考えられます

    Collected and aggregated:2026-10-13 17:29 (Japan time)

  8. PR TIMES（企業の発表）
    築10年以内が−4.7%、築10年超が−2.1%

    Collected and aggregated:2026-10-13 17:29 (Japan time)

  9. 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 17:29 (Japan time)

  10. 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 17:29 (Japan time)

  11. PR TIMES（企業の発表）
    実際の成約価格ではなくAI査定に基づく推定値

    Collected and aggregated:2026-10-13 17:29 (Japan time)

  12. 株式会社マーキュリー
    東京23区では1,134戸が流通し、70㎡あたりの平均価格は1億9,296万円でした

    Collected and aggregated:2026-10-13 17:29 (Japan time)

  13. 株式会社マーキュリー
    前年同月比は23区全体で－938万円（－4.6％）と前年の水準を下回りました

    Collected and aggregated:2026-10-13 17:29 (Japan time)

  14. PR TIMES（企業の発表）
    東京23区（同＋11.8%）

    Collected and aggregated:2026-10-13 17:29 (Japan time)

  15. 株式会社マーキュリー
    流通時点における築年数が20年以内で20階建て以上の中古マンションが対象

    Collected and aggregated:2026-10-13 17:29 (Japan time)