1. Introduction
In recent years, the rapid proliferation of generative AI and cloud services has led to a dramatic increase in demand for data processing. Data centers have increasingly taken on the role of critical infrastructure supporting socio-economic activities, with demand for their development particularly rising in urban areas. At the same time, from the perspective of coexistence with local communities, considerations such as environmental impact and alignment with urban development have become increasingly important in data center projects. In response, the Tokyo Metropolitan Government published the “Guidelines for Data Centers Harmonized with Urban Development” (the “Guidelines”) on March 31, 2026.
2. Overview
(1) Two Key Perspectives Presented in the Guidelines
In understanding the Guidelines, the following two perspectives articulated by the Tokyo Metropolitan Government are particularly important.
First, at the outset of the Guidelines, the Tokyo Metropolitan Government characterizes data centers as “core social infrastructure supporting a digital city” and clearly states its intention to promote their development while ensuring consistency with electricity demand, decarbonization efforts, and urban development policies.
Second, the Guidelines emphasize that, in developing data centers, it is important not only to achieve compatibility with environmental considerations and urban development, but also to engage with local communities at an early stage. From this perspective, the Guidelines (i) clarify “what a data center is” as a common basis for dialogue among stakeholders (including developers, residents, and administrative authorities), and (ii) for data center developers, summarize the applicable legal requirements—such as those relating to location, scale, and environmental performance—while encouraging early communication with local residents and the formulation of plans that incorporate community integration and environmental considerations.
(2) Compliance with Applicable Regulations
The Guidelines also set out various regulatory requirements that typically need to be considered in the development of data centers. Notably, with respect to zoning regulations under the City Planning Act and the Building Standards Act, the Guidelines state that, although the applicable classification may vary depending on the specific characteristics of a facility and confirmation with the relevant authority is required, data centers are generally treated as “offices” rather than more strictly regulated categories such as “factories.” If a data center is classified as an “office,” it may, from a zoning perspective, be developed in a wide range of use districts, excluding those designated exclusively for residential use.
In the meantime, the Guidelines remind that, in developing data centers, compliance is also required with various other regulations, including building restrictions such as height limits and shadow regulations, district plans and urban development guidelines, as well as regulations relating to environmental performance. In addition, attention must be paid to standards concerning environmental considerations in surrounding areas, such as greening, noise, and vibration.
(3) Early Dialogue for Mutual Understanding and Coordination
The Guidelines particularly emphasize the importance of data center developers engaging in communication with local residents as early as possible and advancing mutual understanding and coordination smoothly while taking into account the concerns of the community. Data centers tend to give rise to perception gaps with local residents due to concerns over visual impact on the landscape, noise, and heat exhaust. The Guidelines call for information sharing and the commencement of dialogue from the initial planning stage.
The Guidelines also present key points for facilitating smooth dialogue as below.
<Key Points for Facilitating Smooth Dialogue>
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Early dialogue triggered by various applications and procedures: It is important to proactively communicate with neighboring residents from an early stage, seizing every opportunity to do so beyond the explanations required by laws and regulations.
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Disclosure and explanation of information to deepen community understanding: When providing explanations to local residents, it is important to offer thorough explanations on matters of local concern—for example: (a) an overview of the facility and the project schedule; (b) impacts on the surrounding area and corresponding countermeasures, such as shadowing effects, wind, radio wave interference, visibility from key vantage points, and measures to address traffic impacts; (c) impacts on the global environment, including power consumption and CO2 emissions, along with countermeasures; and (d) efforts contributing to the local community, such as greening plans and design considerations for the exterior appearance.
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Ongoing communication after the facility becomes operational: In order for a data center to coexist as a member of the local community, it is important to foster an environment in which smooth dialogue and coordination continue even after construction is complete and operations have commenced.
3. Conclusion
Although the Guidelines do not have legally binding force, they are expected to serve as an important reference point in future administrative practice. They are also likely to have precedential significance for the formulation of future rules and guidelines relating to data centers in other regions.
It should also be noted that, as suggested in the Guidelines, in addition to metropolitan-level ordinances and the Guidelines, additional rules tailored to local circumstances may exist—both currently and in the future—at the ward, city, or town level in Tokyo, including through local ordinances and administrative guidance. For example, Koto Ward of Tokyo enacted the “Guidelines for Early Notification of Construction Plans for Large-Scale Data Centers” in December 2025 (effective February 2026), and in March 2026 formulated the “Guidelines for Discussions on Large-Scale Data Center Construction Plans (for Residents),” reflecting efforts to institutionally reinforce consensus-building processes at the community level.
For developers planning data center projects in Tokyo, it will be necessary to fully understand the contents of the Guidelines, closely monitor regulatory developments at the municipal level, and, while promoting early information sharing with administrative authorities, devise measures to enhance understanding among local residents and appropriately reflect such considerations in project planning.
