Japan’s data centre opportunity: Key legal considerations and insights for investors
Japan has firmly established itself as one of Asia’s most attractive data centre markets, driven by the rapid growth of generative AI. Policy support is also gathering pace: the government designated its first gigawatt-class data centre cluster zones in September 2026, regulators have clarified that key data centre equipment can be held by J-REITs, and the regulatory framework is being refined to accommodate larger and more power-dense facilities. As the market matures, the most successful investors will be those who address site, permitting, power, regulatory and structuring considerations early and in an integrated way. This alert covers (1) administrative litigation trends affecting site selection, (2) telecommunications, energy and foreign investment requirements, (3) financing structures and terms, and (4) power supply and the new GX Strategic Zones, together with our practical insights on each.
1. Administrative litigation trends
Multiple administrative lawsuits concerning the use classification of data centres (DCs) are pending, primarily in Chiba Prefecture. Any precedent-setting rulings could have industry-wide implications and may bring welcome clarity to the market. Please note that our preliminary analysis below is based solely on publicly reported sources.
Core legal issue
Whether a DC constitutes an “office” (jimusho), “factory” (koujo), “warehouse” (souko), or “other” (sonota) under the Building Standards Act (kenchiku kijun hou). Classification as an “office” generally permits construction across a wide range of use districts, whereas classification as a “factory” would restrict large-scale construction in commercial and residential districts. Disputes can also turn on the use provisions of District Plans (chiku keikaku) rather than on general zoning alone under the City Planning Act (toshi keikaku hou); District Plans are adopted by the relevant municipalities and function as local rules. In most cases, the classification determines whether a DC is permitted at the site, and plaintiffs typically argue that it is not. There is no nationally uniform standard, and determinations vary across administrative authorities and Designated Confirmation and Inspection Bodies. For example, in Inzai City, Chiba Prefecture, public information meetings are being held with a view to revising the District Plans (chiku keikaku). Investors are well advised to monitor how the current disputes and related District Plan revisions develop, as these are likely to provide a clearer framework for site selection.
2. Regulatory an licensing requirements
Telecommunications Business Act (denki tsushin jigyou hou)
If the service is limited to the provision of space (colocation), registration or notification is not required. If hosting services involve the intermediation of communications of others, registration or notification may be required.
AI compute and connectivity (on-ramp) services
The provision of AI compute capacity to customers (e.g., GPU-as-a-service) is likely to constitute a so-called “item (iii) business” under Article 164(1)(iii) of the Telecommunications Business Act, requiring no registration or notification, provided that the provider does not install telecommunications line facilities in Japan (including capacity held under an IRU) and does not offer functions enabling customers to communicate with third parties through its servers. The Ministry of Internal Affairs and Communications (“MIC”) treats server lending on this basis, although its guidance does not specifically address AI compute services. By contrast, a dedicated connection or on-ramp service linking customers to the provider’s compute resources may require registration or notification. An argument that the connectivity service is merely ancillary to the compute service can be weakened where it is contracted and priced separately. The Act also applies to foreign corporations providing services from abroad to persons in Japan, which may file through a representative or agent in Japan; any required filing must be completed before the service commences, and a registered or notified carrier falls within the designated sectors for FEFTA purposes.
Act on the Rational Use of Energy and the Shift to Non-fossil Energy (enerugi no shiyou no gourika oyobi hi-kaseki enerugi e no tenkan to ni kansuru houritsu, “Energy Conservation Act”)
Business operators whose annual energy consumption reaches 1,500 kL crude oil equivalent on an enterprise-wide basis are designated as Specified Business Operators (tokutei jigyōsha). Additional measures specific to the data centre business took effect on 1 April 2026, including expanded reporting and partial public disclosure of metrics such as PUE (Power Usage Effectiveness), with benchmarks of an operator-average PUE of 1.4 by FY2030 and 1.3 for new facilities from FY2029.
Foreign Exchange and Foreign Trade Act (gaikoku kawase oyobi gaikoku boueki hou, “FEFTA”)
Pure colocation investments are often outside the prior notification requirement. However, investments extending into connectivity, managed services, cloud platforms or similar activities may trigger prior notification obligations. The Act Partially Amending FEFTA was enacted on 29 May 2026 and promulgated on 5 June 2026. It introduces, among other things, (i) screening of indirect acquisitions (e.g., acquisition of 50% or more of the voting rights of a foreign entity holding shares in a Japanese company), (ii) codified risk mitigation measures, and (iii) post-closing intervention powers for investments in non-designated sectors. The substantial revisions will take effect on 4 January 2027. Even where no prior notification is required, DC investors should therefore consider post-closing intervention risk and the implications for holding structures.
3. DC finance: Structure and terms
Structures relevant to DC finance
(1) TK-GK structure (Companies Act / Commercial Code (silent partnership (tokumei kumiai))):
A structure in which a limited liability company (godo kaisha, GK) acts as the operator and investors participate as silent partners (TK). By placing real property in trust and converting it to trust beneficial interests, the structure can avoid the application of the Act on Specified Joint Real Estate Ventures (fudosan tokutei kyoudo jigyou hou). The flexibility of the GK is advantageous.
(2) TMK (Specific Purpose Company / tokutei mokuteki kaisha) (Act on Securitisation of Assets (shisan no ryuudoka ni kansuru houritsu)):
Land and buildings (or the trust beneficially rights of them) are held by a TMK for long-term institutional ownership based on an Asset Securitisation Plan (shisan ryuudoka keikaku). A TMK may not conduct any business other than asset securitisation in accordance with its Asset Securitisation Plan and incidental business, and the plan sets out matters such as the specified assets to be acquired, their management and disposal, and the method of financing. Investors benefit from a high degree of certainty that the vehicle will be operated as planned. On the debt side, a TMK typically raises funds through specified bonds (tokutei shasai) and specified borrowings (tokutei kariire) from banks or other qualified institutional investors, alongside equity in the form of preferred equity (yuusen shusshi).
(3) J-REIT (Act on Investment Trusts and Investment Corporations (toushi shintaku oyobi toushi houjin ni kansuru houritsu)):
Investment corporations serve as a long-term holding vehicle for stabilised DC assets. It had been unclear whether high-value DC-related equipment qualifies as “real property”, which investment corporations may hold as their principal investment. On 27 June 2025, the FSA (Financial Services Agency) revised its Q&A on Investment Corporations to clarify that equipment installed for integrated use with a DC building will generally constitute real property under Article 3(iii) of the Enforcement Order of the Act where separating it from the building would cause physical damage, excessive cost, material loss of economic value or significant socio-economic detriment, assessed on an equipment-by-equipment basis. The Q&A provides examples (such as elevators and power receiving and transforming equipment) together with installation conditions. The Tokyo Stock Exchange subsequently revised its listing rules for real estate investment trust securities to include such building-related equipment in the definition of real property.
Debt finance characteristics
Debt financing for DC projects in Japan is still evolving and is best characterised as a hybrid of real estate finance and project finance (PF). Tenant (hyperscaler, etc.) creditworthiness forms the foundation of financing, and long-term wholesale contracts represent the most bankable revenue model for lenders. Project monitoring utilises both PF-style metrics such as DSCR (Debt Service Coverage Ratio) and real estate finance metrics such as LTV (Loan-to-Value). Loan tenors are typically 3–5 years, with structures generally premised on refinancing.
4. Power supply and infrastructure constraints
In the Greater Tokyo area, grid connection lead times of several years, and in some cases approaching a decade, have been reported, making power a primary constraint on site selection and underwriting. On 11 September 2026, METI designated the first batch of “GX Strategic Zones”, including nine regions (ten sites) under the data centre cluster category (e.g., Hokkaido (Ishikari and Tomakomai), Akita, Miyagi, Tochigi, Ibaraki, Toyama, Kagawa, Fukuoka and Kagoshima), aimed at forming gigawatt-class DC clusters over the next decade. The designations are subject to conditions, including ensuring community coexistence. Hyperscalers are also utilising long-term VPPAs (virtual Power Purchase Agreements) for decarbonisation and cost stabilisation.
5. Outlook for investors
Japan offers foreign investors a deep and policy-supported data centre market, with an expanding financing toolkit and new growth opportunities beyond Tokyo. Investors who address site-specific planning rules, licensing, FEFTA and power at the outset will be well positioned to capture this opportunity with confidence.
Ashurst Perkins Coie advises on data centre investments in Japan and around the world – we stand ready to help you turn that opportunity into a successful investment - please do not hesitate to get in touch at any stage of development.
