DBJ Green Building Certification

The Tekko Building has received the highest rating of 5 stars in the DBJ Green Building Certification program, earning particularly high scores in the areas of wellbeing and resilience.

On September 18, 2025, the Tekko Building was awarded the highest five-star rating under the DBJ Green Building Certification program (the office building version) by the Development Bank of Japan Inc. (DBJ). This certification program comprehensively evaluates and certifies "environmentally and socially responsible real estate" as required by society and the economy based on a holistic evaluation that includes not only environmental performance but also disaster prevention and contributions to the community. The five-star rating received this time places the Tekko Building among the top approximately 10 percent of all properties nationwide eligible for the certification, recognizing it as an “environmentally and socially responsible” building.

Reference
DBJ Green Building Website： https://igb.jp/en/index.html

Background of our certification and points evaluated

Since before its completion in October 2015, the Tekko Building has been committed to reducing its environmental impact, improving comfort, preventing disasters, and collaborating with the local community, with “Linking people, the city and the times in every era” as the concept for our building development.
In this certification, these ongoing efforts were highly evaluated, and we achieved top-ranking scores among DBJ Green Building certified properties, especially in the following areas out of the five evaluation categories.

1. Well-Being (performance and convenience/comfort)
◇ Performance
- ･Comfortable office space with no columns, a ceiling height of 2,950 mm and a slab load capacity of 4,900N/m2
◇ Convenience and comfort
- ･Conveniently located a 2 minute-walk from Tokyo Station and close to several train stations serving more than 5 lines
- ･Commercial complexes such as Daimaru, Takashimaya, and Mitsukoshi and green space are located within a 10-minute walk.
- ･Full range of facilities, including medical clinic, fitness facility, restaurants, post office, bank, and day care center, are available.
- ･Multi-purpose rental meeting rooms are available with full business support.
- ･Refreshment corners such as members-only lounges, etc., are provided.
- ･Wellness support for physical and mental health, including aroma diffusers and yoga events, is provided.
2. Resilience (environmental risk, disaster prevention, crime prevention, legal compliance)
◇ Environmental risk
- ･Installation of flood barriers
◇ Disaster prevention
- ･Seismic resistance of 150% or more of the value specified under the seismic isolation method or by the Building Standard Act
- ･Reliability ensured by spot network power receiving system
- ･Power supply for 72 hours or more using both heavy oil and gas in emergency power generators (a gas turbine generator dedicated to heavy oil and a dual-fuel system generator)
- ･A system to accommodate up to 1,200 people who are unable to return home is prepared under an agreement with Chiyoda-ku, Tokyo.
◇ Crime prevention
- ･Multilayered security, including 24/7 on-sight management and IC card access control
◇ Legal compliance
- ･Self-inspections of the building environment, disaster prevention, etc.
3. Energy & Resources (energy and resource conservation)
◇ Energy-saving performance
- ･Reduction of primary energy consumption
◇ Air conditioning, ventilation, and thermal insulation
- ･High-frequency filter cleaning to improve air conditioning efficiency
- ･Outside air intake through the installation of dedicated ventilation windows
- ･Automatic control of outdoor air intake through CO2 sensors
◇ Lighting
- ･Lighting control for turning off or dimming lights through motion sensors
- ･Energy-saving design by illuminance control system based on daylight use and full introduction of LED lighting
◇ Water saving
- ･Reuse of rainwater and miscellaneous wastewater through gray water facilities (gray water treatment plant)
- ･Adoption of water-saving toilets
◇ LCC reduction
- ･Use of recycled materials in buildings
◇ Resource conservation
- ･Digitization of waste disposal manifests
◇ Acquisition of environmental labeling
- ･Acquisition of S rank in the CASBEE for Real Estate Certification and the CASBEE for Wellness Office Certification
4. Community & Diversity (consideration for user diversity, the surrounding environment, and biodiversity)
◇ Consideration for user diversity
- ･Introduction of universal design and installation of barrier-free restrooms
- ･Installation of personal meeting booths in the building to accommodate a variety of work styles
- ･Support for international users and visitors through foreign-language signage
- ･Hospitality provided by a staffed reception at the office entrance
◇ Consideration for the surrounding environment
- ･Large-scale green walls, rooftop greening, and exterior greening of public open spaces
- ･Heat environment mitigation through water retention/permeable pavements and the installation of dry mist systems
5. Partnership (partnerships and information disclosure)
◇ Partnership
- ･Adoption of a system that enables disclosure and comparison of monthly energy consumption for tenants
- ･Sharing of CO2 reduction and energy-saving targets between the building owner and operators
- ･ Preparation of a BCP manual and sharing of the manual with tenants
◇ Information Disclosure
- ･Property management system in line with sustainability policy
- ･Dissemination of environmental information through the website

Linkage with existing environmental certifications

The Tekko Building received the highest S rank in the CASBEE for Real Estate Certification and the CASBEE for Smart Wellness Office Certification in 2023. By newly acquiring the DBJ Green Building certification as well, the Building's overall value has been recognized in terms of environmental, social, health, and disaster prevention aspects.