2026 Analysis: Two Years After 'Tower Mansion' Tax Rule Changes - Impact on Tokyo Bay Area Prices & Future Investment Strategy

More than two years have passed since the enforcement of new rules on January 1, 2024, regarding inheritance tax valuations for so-called "tower mansion tax-saving schemes." At the time, there was speculation that "investment money aimed at tax savings will pull out, causing prices of high-rise condominiums in central Tokyo to crash." This drew significant attention to market trends in the city's bay area, where many of these properties are concentrated.

Two years later, how has the market actually changed? Despite the headwind of tighter regulations on excessive tax avoidance, the high-rise condominium market in the bay area has shown resilience beyond our expectations. However, a closer look reveals that the market is transitioning into a new phase, making discerning property selection more critical than ever.

This article provides a multi-faceted analysis of the impact of the rule change on the central Tokyo bay area, particularly the high-rise condominium market around Kachidoki Station, based on the latest data as of May 2026. From the perspective of a real estate analyst, we will thoroughly break down trends in prices and transaction volumes, changes in the high-floor premium, and future investment strategies.

1. Introduction: Overview of the 2024 Rule Change for the Tower Mansion Tax-Saving Scheme

First, let's briefly review the 2024 rule change that forms the basis of our discussion.

Before the revision, the inheritance tax valuation of a condominium was calculated based on the government-assessed land value (rosenka) and the fixed asset tax valuation for the building. This valuation tended to be significantly lower than the actual market transaction price. The disparity was particularly large for buildings with many units and for units on higher floors. For instance, it wasn't uncommon for a property with a market value of 100 million yen to have an inheritance tax valuation of around 30 million yen. Using this gap between the valuation and market price to reduce inheritance taxes was known as the "tower mansion tax-saving scheme."

However, as this practice came to be seen as a form of tax avoidance, the National Tax Agency (NTA) introduced a new valuation method for properties acquired through inheritance on or after January 1, 2024. The core of this change is to correct the disparity between the valuation and the market price for each individual condominium unit.

Specifically, it is a system that adjusts the conventional valuation based on a "valuation disparity ratio," calculated using the following formula:

Post-revision valuation = Pre-revision valuation × Valuation disparity ratio × Minimum valuation level (0.6)

The calculation of this valuation disparity ratio takes into account factors such as "building age," "total number of floors," "the unit's floor level," and "share of land ownership." This has resulted in a higher valuation for properties where the disparity was greatest—namely, "newer buildings and units on high floors"—bringing the valuation closer to the market price. The stated purpose of this revision was purely to "ensure fairness in taxation," not to cool down the high-rise condominium market itself. So, what effect did this policy change have on the market?

2. Two Years Post-Revision: A Data Analysis of the Central Bay Area High-Rise Condo Market

Contrary to some predictions that "tighter regulations will cause prices to fall," the high-rise condominium market in Tokyo's central bay area has remained robust. Let's examine the trends using market data for previously-owned condominiums around Kachidoki Station in Chuo Ward, an area with a high concentration of such properties.

Table 1: Trends in Average Price per Tsubo and Transaction Volume for Previously-Owned High-Rise Condominiums around Kachidoki Station

Source: Created based on data from the Real Estate Information Network System for Eastern Japan (REINS) and our proprietary "Mekiki Property Research" database (for buildings under 15 years old, converted to 70m² units).

As the data shows, far from crashing after the rule change, prices have continued on a gentle upward trend. Looking at transaction volumes, there was a slight decrease in the first half of 2024 due to a temporary wait-and-see mood, but activity has since recovered and is now more robust than before the revision.

This data suggests that strong underlying demand exists in the market, more than enough to absorb the negative factor of the crackdown on the tower mansion tax-saving scheme.

3. Limited Impact on Prices? Three Reasons for the Market's Resilience

Why has the bay area's high-rise condominium market been so resilient? We believe it is due to a combination of the following three factors.

Reason 1: The Presence of Overwhelming End-User Demand

The biggest reason is that high-rise condominiums in the bay area hold extremely high value not just as investment products for tax savings, but as "homes to live in."

• Transportation Convenience: Areas like Kachidoki, Tsukishima, and Toyosu offer 10-20 minute access to central business districts like Ginza, Marunouchi, and Otemachi via the Oedo and Yurakucho subway lines. The full-scale operation of the Bus Rapid Transit (BRT) system has also begun, and transportation infrastructure is improving year by year.
• Mature Living Environment: With well-planned commercial facilities, supermarkets, clinics, and daycare centers, the environment is extremely livable for families with children and dual-income households ("power couples").
• Excellent Residential Performance: The added value unique to high-rise condominiums—such as great views, extensive common facilities (gyms, pools, guest rooms, lounges), high security with 24-hour concierge services, and the latest disaster-preparedness features—is a major draw for end-users.

The strong purchasing appetite from these end-users, attracted by these features, provides powerful support for the entire market, even as some demand for tax-saving purposes has receded.

Reason 2: Continued Monetary Easing and Asset Inflation

The historically low interest rate environment, which continues into 2026, is a powerful tailwind for end-users utilizing home loans. With mortgage rates remaining stable at low levels, the hurdle to purchasing expensive high-rise condominiums is relatively lower. Furthermore, against a backdrop of global inflation and a weaker yen, there is an active movement to shift funds from cash and securities to real assets like real estate. In particular, real estate in central Tokyo, known for its stable asset value, continues to attract capital from both domestic and international investors seeking to protect their assets.

Reason 3: The Tax-Saving Effect Hasn't Disappeared Entirely

The purpose of the recent rule change was strictly to "correct excessive tax-saving effects." It did not make the inheritance tax valuation of high-rise condominiums completely equal to their market price. The effect of compressing the valuation compared to inheriting cash or financial assets still remains. Although the disparity has narrowed, it is still entirely possible for a property with a market value of 100 million yen to have a valuation of around 60 to 70 million yen. Therefore, demand from affluent individuals who consider inheritance tax planning as a secondary benefit has not completely vanished.

4. Changes in the High-Floor Premium: Has the Gap Between Valuation and Market Price Narrowed?

The properties most affected by the rule change were those on "high floors," where the gap between valuation and market price was largest. The revision raised the valuation of high-floor units, certainly diminishing their tax-saving benefits. So, how did this affect the "high-floor premium" (the additional price compared to lower floors) in the actual market?

Table 2: Change in Price Difference by Floor Level within the Same High-Rise Condominium (Kachidoki Building A, 10 years old)

Looking at the model case above, we can see a trend where the price growth rate for high floors has slowed slightly compared to low and mid floors, and the price gap (premium) over low floors has marginally shrunk. This is likely the result of buyers, conscious of the diminished tax benefits immediately after the revision, taking a more critical view of high-floor prices.

However, two years on, the market has already priced in this change. The "residential value premium" of high floors—their unique views, privacy, and status, which are unrelated to tax savings—is being re-evaluated, and prices have stabilized. In other words, the market is shifting its valuation axis from "tax value" to "intrinsic residential value" and is in the process of forming a new price structure.

5. Secondary Market Trends: No Panic Selling, but Strong Buyer Appetite

While there were concerns about "panic selling" by owners who held properties for tax-saving purposes, in reality, no such sell-off occurred.

The reason is simple: as mentioned earlier, real estate prices themselves have continued on an upward trend, so there was no incentive for owners to rush to sell. If anything, with capital gains expanding, more owners are carefully timing their sales.

On the other hand, buyer appetite is extremely strong. In particular, power couples and families in their 30s and 40s, attracted by the future potential and excellent living environment of the bay area, have become the main players in the secondary market. Against the backdrop of soaring new construction prices, they are actively seeking well-maintained, relatively new, previously-owned high-rise condominiums. Well-conditioned properties are selling almost as soon as they hit the market.

As a result, a "seller's market" continues, with the supply-demand balance providing strong support for prices.

6. Impact on Developer Strategies for New Construction and Future Supply Forecasts

The rule change has also brought about a shift in the sales strategies of developers supplying new condominiums.

Sales pitches that once emphasized "effective for inheritance tax planning" have faded, replaced by a clear shift toward promoting the intrinsic appeal of the properties themselves. Specifically, there is a stronger tendency to highlight points such as:

• High levels of sustainability and disaster preparedness
• Amenities that meet modern needs, such as EV charging stations and co-working spaces
• Landscape design that allows residents to feel close to nature even in the city center
• More spacious and practical floor plans targeted at end-users

This can be seen as evidence that the market is heading in a healthier direction.

Regarding future supply, the Kachidoki and Harumi areas are expected to become even more vibrant as residents continue to move into "HARUMI FLAG," the former site of the Tokyo Olympic Village, increasing the area's overall population. While a large-scale new supply rush like in the past is unlikely due to soaring construction costs and difficulty in acquiring land, planned redevelopment projects are steadily moving forward, and the area's value is projected to increase over the medium to long term.

7. Future Investment Strategy: Key Points for Property Selection in an Era of Tighter Regulation

Given these changes in the market environment, what investment strategy should we adopt going forward? The key points for succeeding in this era of tighter regulation can be summarized in the following three points.

Point 1: A Complete Break from the "Tax-Saving Myth"

First and foremost, one must recognize that the era of buying high-rise condominiums solely for inheritance tax purposes is over. It is essential to return to the fundamentals of real estate investment, focusing on selecting properties with high asset value that can generate income gains (rental income) and capital gains (resale profits).

Point 2: Thorough Examination of Liquidity and Rental Demand

High liquidity—the ability to "rent it anytime, sell it anytime"—will be the lifeline of high-rise condominium investment from now on. It is crucial not only to mechanically check the following items but also to deeply consider the context behind them.

• Distance from Station: Ideally within a 5-minute walk. Properties with direct station access, like some in Kachidoki, are particularly valuable as they offer a clear point of differentiation.
• Living Convenience: Are daily necessities like supermarkets, as well as schools, parks, and clinics essential for families, within walking distance?
• Building Scale and Brand: The economies of scale in buildings with 300 or more units lead to more stable management fees and repair reserve funds. Properties by major, reputable developers also tend to be well-regarded in the secondary market.
• Permanence of Views: A rare view, such as of Tokyo Bay or the Hamarikyu Gardens, is a significant asset. However, you must confirm the zoning regulations and surrounding development plans to assess the risk of another building obstructing that view in the future.

Point 3: Soundness of a Building's Management and Long-Term Repair Plan

Because high-rise condominiums have large-scale, complex facilities, the quality of their maintenance and management greatly affects their asset value. When considering a previously-owned property, be sure to check the following:

• Long-Term Repair Plan: Is there a proper plan in place, and are repair reserve funds being collected and accumulated accordingly?
• Management Association Operations: Review the minutes of general meetings to confirm that the management association is functioning effectively and that there are no major issues among residents.
• Level of Repair Reserve Funds: Is the amount of the reserve fund too low compared to similarly sized condominiums in the area? A thorough check is necessary to avoid the risk of sharp future increases or special levies.

The "discerning eye" to evaluate these fundamental values is the key to success in the new phase of the high-rise condominium market.

8. Conclusion: The Bay Area High-Rise Market Enters a New Phase

Two years after the 2024 rule change on the tower mansion tax-saving scheme, the market in Tokyo's central bay area has overcome pessimistic forecasts, demonstrating surprising strength and flexibility. Rather than triggering a market collapse, this regulatory tightening has served as a catalyst for a transition to a healthier, more mature market—one evaluated not on the special value of "tax savings," but on the fundamental real estate values of "livability," "convenience," and "asset quality."

While prices are expected to remain firm for the time being, the difference in value between individual properties will become more pronounced. Location, building specifications, and above all, the quality of management will be the major determinants of future asset value.

The era when any high-rise condominium would appreciate in value is over. We have entered an age where the ability to "discern"—to find that one truly superior unit among many that will maintain and increase its value over the long term—is equally demanded of both investors and end-users.

For more detailed market trends in the Kachidoki area or to assess the value of individual properties, we recommend using "Mekiki Property Research," which provides objective analysis based on vast amounts of data. Research properties around Kachidoki Station with Mekiki Property Research → (https://mekiki-research.com/?lat=35.6582&lng=139.7828)