When we have covered hotel site acquisition in the past, the question has always been what can be built on the land. Zoning and floor area ratio set the ceiling (we mapped development headroom by market in Hotel Development Capacity 2026: Zoning, FAR & Land Price in 5 Markets), the Regulation of Residential Land Development Act sets the cost of grading a slope, and the Article 93 notification under the Act on Protection of Cultural Properties sets the schedule before groundbreaking. All of those concern what sits on the land, or its surface layer. This article goes one level below: what remains in the ground of the land you just bought.

The governing law is the Soil Contamination Countermeasures Act (Act No. 53 of 2002), administered by the Ministry of the Environment — an entirely separate regime from buried cultural properties, which fall under the Agency for Cultural Affairs. The decisive difference is that the Soil Contamination Countermeasures Act builds in a restriction on property rights known as area designation. A cultural property notification means “tell us before you dig, and we will record what is there if necessary.” But once land is designated a Designated Area Requiring Action, Article 9 provides that no person may change the character of the land. Until remediation is complete, construction itself cannot start. If the Regulation of Residential Land Development Act is a permit for moving soil, the Soil Contamination Countermeasures Act is a rule requiring you to investigate before you move it — and depending on what the investigation finds, you may not be allowed to move it at all.

According to the FY2024 implementation status survey published by the Ministry of the Environment on 23 April 2026, 661 areas nationwide were designated during the year (588 the previous year), bringing the cumulative total to 7,599. At the entrance to that funnel, meanwhile, sit 12,507 annual notifications of changes to the character of land. This article breaks down what happens between those 12,507 filings and 661 designations, cross-reading the statutory text, the Ministry of the Environment’s implementation survey, the Ministry of Land, Infrastructure, Transport and Tourism’s published land prices and building plan data, and our own accommodation rate data.

Three entry points decide whether construction stops — Articles 3, 4 and 5

The investigation obligation under the Soil Contamination Countermeasures Act does not arise automatically from the land itself. It is triggered only when one of three entry points is crossed. For hotel development, Articles 3 and 4 are the ones that matter.

The point to grasp here is that the area threshold has two tiers. The default is 3,000 m², but it drops to 900 m² on the site of a factory or works where a Specified Facility Using Hazardous Substances is currently installed, and on sites subject to discontinuation of use under Article 3(1). In other words, for the same size of hotel, the probability of falling within the notification net jumps the moment you choose a former factory site.

This is not a theoretical concern. Extracting hotel-use plans from the Ministry of Land, Infrastructure, Transport and Tourism’s “Statistical Survey of Building Construction Dynamics” and approximating building footprint as total floor area divided by number of floors for the 69 plans where both figures are known, only 20 plans (29.0%) reach 3,000 m², while 38 (55.1%) reach 900 m². Cutting the threshold to a third roughly doubles the number of plans caught. Because the actual area subject to a change of character is larger than the building footprint (it includes the excavation perimeter, temporary works and external works), this is a lower-bound estimate.

And once an area designation is made, the nature of the constraint on the project differs fundamentally between a Designated Area Requiring Action and a Designated Area Requiring Notification for Change of Character.

Of the 661 area designations, 87.4% (578) are Designated Areas Requiring Notification for Change of Character. Designation still leaves most sites buildable — that is the first practical fact. The remaining 83 are Designated Areas Requiring Action, where the schedule stops until remediation is complete. In an acquisition decision, the starting point is not to bundle these two under the single phrase “soil contamination.”

Designations up 27.6% in five years — more investigation, or more contamination?

Over the five years from FY2020 to FY2024, area designations rose 27.6%, from 518 to 661. Over the same period, investigation reports rose 25.2%, from 1,342 to 1,680. The fact that the two growth rates line up suggests that contamination itself is not spreading; rather, more land is being subjected to investigation. The more land trades and redevelops, the more of the subsurface becomes visible.

In the breakdown, Designated Areas Requiring Action have moved sideways — 60, 74, 93, 71, 83 — while the growth is driven by Designated Areas Requiring Notification for Change of Character (458 to 578, +26.2%). It is not that heavy contamination requiring remediation is increasing; the more accurate reading is that the stock of land that requires a filing whenever you dig is accumulating.

Next, the total volume of filings at that entry point, and the share that proceeds to investigation.

In FY2024, notifications of a change of character under Article 4(1) numbered 12,507 (13,248 the previous year). Of those, investigation results were reported under Article 4(2) in 699 cases — just 5.6% of all filings. Governors issued investigation orders under Article 4(3) in 40 cases, or 0.32% of filings. The previous year saw 625 reports (4.7%) and 71 investigation orders (0.54%) against 13,248 filings.

In short, most projects that file solely because they are excavating 3,000 m² or more start construction without proceeding to an investigation. The filing itself creates a statutory 30-day waiting period, but anything beyond that hits the schedule in roughly one case in twenty.

77.5% of closed factory sites remain uninvestigated — and once you dig, orders follow in over 90% of cases

What really bites in hotel development is not Article 4 but Article 3, one step upstream. When use of a Specified Facility Using Hazardous Substances is discontinued, the landowner incurs an investigation obligation. Yet of the 804 discontinuations in FY2024, 623 (77.5%) had the investigation obligation temporarily exempted. The previous year showed the same pattern: 664 of 902 (73.6%).

The temporary exemption is squarely provided for in the law where the site continues in use as a factory, people do not enter it, and other requirements are met. But from the buyer’s side, it means that land where “the factory has closed but the subsurface remains uninvestigated” is accumulating at a pace of more than 600 sites a year. The number of sites under temporary exemption during FY2024 totalled 1,039 — 623 discontinued that year plus 416 discontinued in earlier years.

And the exemption is not permanent. When someone attempts a change of character on exempted land, a notification under Article 3(7) is required, and Article 3(8) provides that the governor shall order an investigation (the wording is mandatory, not permissive). In FY2024, 368 investigation orders were issued against those 401 notifications — a rate of 91.8%. The previous year was 343 of 375 (91.5%), essentially the same level two years running.

That 91.8% issuance rate feeds directly into how site due diligence is designed. If you look only at Article 4 filings and assume “only 5.6% proceed to investigation,” the premise flips the moment the target site turns out to be temporarily exempted land under Article 3. What to verify before signing a sale and purchase agreement is whether the site has a history of temporary exemption — that is the branch point.

88.7% of measures are excavation and removal — the same work as hotel foundations, run first

Once an area is designated and remediation actually begins, the choice of method is heavily skewed. Of the 533 measures carried out in FY2024, excavation and removal accounted for 473 (88.7%). The cumulative figures since FY2010 show the same ratio: 5,945 of 6,677 (89.0%). In-situ purification accounts for 32 cases (373 cumulative) and capping with fill for 15 (126 cumulative).

Why excavation and removal wins is easy to understand from the developer’s logic. In-situ purification leaves the contamination in the ground and cleans it over time; the duration is hard to read and the timing of de-designation harder still. Excavation and removal, by contrast, digs out the contaminated soil, hauls it off site and backfills with clean soil. The work is the same “move the earth” operation as construction, and the duration can be estimated. For a developer who needs to lock a development schedule, it is the easier option to handle.

There is an overlap specific to hotel development here. Hotels frequently place plant rooms, parking and kitchen equipment below grade, so they excavate to a fair depth anyway. Where excavation and removal is required, the excavation for the building itself and the excavation as a remediation measure target broadly the same strata. If the two can be planned as one, duplication is avoidable — but in a Designated Area Requiring Action, Article 9 permits no change of character other than measures implemented under a contamination removal plan, so the default sequence is to complete the remediation first and then start the main works. That sequence is what hits the schedule.

The measures themselves are carried out in almost every designated area. Against 1,100 cumulative designations of Designated Areas Requiring Action, 759 (69.0%) have had the designation lifted and 306 (27.8%) are undergoing measures without yet being de-designated — an implementation rate of 96.8%. Only 35 cases (3.2%) remain untouched. As a system, the mechanism by which designation leads to remediation is working.

One note: this article does not present unit costs for excavation and removal, in-situ containment or any other measure. The Ministry of the Environment’s implementation survey compiles case counts, methods and progress but does not publish construction unit costs, and we could not identify any other current public source that could be cited generally. What follows quantifies only elapsed days and schedule impact, not money.

48.6% of designations sit in six prefectures — the deepest demand markets carry the most industrial history

Grouping FY2024’s 661 area designations by the jurisdictions of the regional environment offices, Kanto leads with 283 (42.8%), followed by Kinki with 145 (21.9%) and Chubu with 70 (10.6%); the top three account for 75.3%. By prefecture (including designated cities), Tokyo has 87, Osaka 67, Kanagawa 53, Aichi 48, Chiba 42 and Hyogo 41.

The six prefectures with the deepest hotel demand — Tokyo, Kanagawa, Aichi, Osaka, Hyogo and Fukuoka — account for 321 cases, or 48.6% of the national total. Narrowing to the four greater Tokyo prefectures (Tokyo, Kanagawa, Chiba and Saitama) still gives 213 cases, or 32.2%. Where accommodation demand concentrates and where industrial land history concentrates are all but the same map.

Industrial land at 24–71% of commercial land — the spread in Keihin, Hanshin and Chukyo

So how is industrial-legacy land valued as a hotel site? From the Ministry of Land, Infrastructure, Transport and Tourism’s “Published Land Prices” (2025), we compiled standard site prices by land use category for Keihin (Kawasaki Ward), Hanshin (Amagasaki), the Osaka waterfront (Konohana Ward), Chukyo (Nagoya Port), Chiba (Mihama Ward) and Shinagawa (Oi).

In Kawasaki Ward industrial land sits at 24.0% of commercial land, in Amagasaki 37.7% and in Konohana Ward 38.5%. Within the same market, a difference in land use category alone puts acquisition cost at a third to a quarter. At the same time, industrial land is in some cases rising faster than commercial land in the same area — Amagasaki +13.8%, Mihama Ward +17.4%. That reads as a sign that demand premised on conversion of use is already feeding into how industrial land is priced.

The question is whether that price gap reflects a gap in earning power as a hotel. We compared our estimated settled ADR for August 2026 across wards containing waterfront and industrial-legacy locations and the central wards of each city.

Konohana Ward in Osaka comes in at ¥11,900 (N=13 properties), 40% above the city’s central ward, Chuo, at ¥8,500 (N=191 properties). Minato Ward at ¥11,100 (N=11) and Suminoe Ward at ¥10,800 (N=7) also exceed Chuo. Kawasaki Ward in Kawasaki is ¥10,200 (N=28), on a par with Naka Ward in Yokohama at ¥9,800 (N=51). Mihama Ward in Chiba is ¥10,900 (N=12), above Chiba’s Chuo Ward at ¥9,100 (N=35). In Tokyo, Koto Ward at ¥12,200 (N=39) comes close to Chiyoda Ward at ¥12,700 (N=80).

Areas with a waterfront, reclaimed-land or industrial lineage are not lagging central districts on room rate. In locations close to event or leisure facilities they are ahead of them. No gap on the revenue side, a two- to fourfold gap on the cost side — that asymmetry is the structural reason industrial-legacy sites are drawing attention. The same asymmetry shows up in land competition with residential development, and the logic of backing out a feasible land price from ADR is covered in detail in Hotel vs Condo Land Rivalry: ADR-Implied Feasible Land Price Map.

Hotel plans on waterfront and industrial land — where they are actually being built

From the Ministry of Land, Infrastructure, Transport and Tourism’s “Statistical Survey of Building Construction Dynamics” we extracted hotel plans located on industrial-legacy land such as waterfront sites, reclaimed land and former railway land. Large projects cluster there: 1,000 rooms at Makuhari New City (Hibino, Mihama Ward, Chiba), 750 rooms and 126 rooms at Chidori in Urayasu, 338 rooms at Minato Mirai in Yokohama, 285 rooms at Hiromachi and Oi in Shinagawa Ward, and 217 rooms at Shibaura in Minato Ward.

To be explicit: the map above shows the character of the locations, not that these sites are contaminated. We have not verified, for any individual plan, whether an investigation has been carried out or whether an area designation exists. All it shows is the fact that large hotel plans are actually proceeding on industrial-legacy land.

How many months this adds — from the 30-day filing to completion of measures

In our earlier piece Hotel Build Times: 2.80-Year Median, 1.96 Solo vs 4.00 Mixed-Use, we measured an average of 2.80 years from groundbreaking to completion across 67 plans (1.96 years for single-use, 4.00 years for mixed-use). The Soil Contamination Countermeasures Act bites in the stretch before that groundbreaking. Below we stack up, stage by stage, only the durations that can be confirmed in statute or in public guidance.

Pulling that together, the schedule impact that can be confirmed falls into three stages. Stage one is a filing and nothing more, adding the statutory 30 days. That covers the great majority of the 12,507 filings. Stage two is proceeding to investigation (699 cases a year via Article 4), where a land history review plus, if needed, sampling and analysis come into play. Where an order is issued, the Ministry of the Environment’s guidelines put the reporting deadline at roughly 120 days for vacant land, so this is where months are added. Stage three is designation as a Designated Area Requiring Action (83 cases a year), where construction cannot start until the contamination removal plan is prepared, submitted and the measures completed.

Measured against the 12,507 Article 4 filings, the probability of landing in stage three is extremely low. But if the target site is temporarily exempted land under Article 3, the investigation order rate jumps to 91.8%. The site’s history determines whether you are adding 30 days or several months — that is the practical takeaway.

Three schedule scenarios — stacking only the days that public sources confirm

The stages above, recast into a form usable in an acquisition decision. Durations are limited to those confirmable in statute or in Ministry of the Environment guidelines; where no published figure exists, we place no number and say so.

Schedule sensitivity on two axes: land history × area of change

Which provision is triggered depends on the combination of the land’s history and the area subject to a change of character. Enforcement Regulation Article 22 sets the scale for an Article 4(1) filing at 3,000 m² as a rule, and at 900 m² for land where a Specified Facility Using Hazardous Substances currently stands or whose use has been discontinued. By contrast, the change-of-character notification for temporarily exempted land under Article 3 (Article 3(7)) has no minimum area: it must be filed in advance, other than for minor acts and similar exceptions.

Price it in and it becomes leverage — the acquisition window others walk away from

Translating the numbers so far into the language of an acquisition decision.

Both the probability and the number of days that the Soil Contamination Countermeasures Act adds can be estimated from published material. The 30-day filing period is statutory, and the reporting deadline where an investigation order is issued has a guide in the Ministry of the Environment’s guidelines. The implementation rate for measures in Designated Areas Requiring Action is 96.8%, so as a system, remediation and de-designation do follow. In other words, much of the range of uncertainty can be narrowed in advance by checking the land’s history.

Conversely, for a developer who evaluates a site without checking that history, this looks like uncertainty that cannot be read. Unreadable uncertainty leads to avoidance, and avoidance stays in the price. The fact that industrial land changes hands at 24% of commercial land in some areas also means that part of that gap is still the price of subsurface uncertainty no one has examined.

As a matter of practice, the order of work is clear. First, confirm the site’s use history and whether any temporary exemption under Article 3 applies. Second, determine early in design whether the area subject to a change of character exceeds 3,000 m² (900 m² on a former factory site), and put the 30-day Article 4 filing on the programme. Third, hold the reporting deadline if an investigation becomes necessary (roughly 120 days for vacant land as a guide) and the remediation period should the site become a Designated Area Requiring Action as a range for price negotiation. Get that far and the site others walk away from turns into a site that can be acquired on conditions.

Where accommodation demand concentrates and where industrial land history concentrates overlap at a ratio of 48.6%. That overlap fits the facts better when read not as a constraint to avoid, but as a stock of sites open only to developers able to examine them.