Connecting Greenery from the "City": Realizing Horizontal Recycling of Interior Building Materials in Office Construction

Tokyu Land Corporation (Headquarters: Shibuya-ku, Tokyo; President and CEO: Hiroaki Hoshino; hereinafter "Tokyu Land") and DIGGLE Inc. (Headquarters: Shibuya-ku, Tokyo; President and CEO: Kiyotaka Yamamoto; hereinafter "DIGGLE") have realized "horizontal recycling"—a process where interior building materials generated from previous office construction are recycled into new, environmentally friendly interior materials for use in other offices—through a co-creation effort during the fit-out construction for DIGGLE’s move into the Ebisu Business Tower (located in Shibuya-ku, Tokyo).

This initiative is part of the environmental measures under "team green"*1, Tokyu Land’s advanced environmental partnership launched in March 2026, and contributes to the sustainability activities of their partner company, DIGGLE. Additionally, as part of Tokyu Land’s environmental efforts, the company also carried out forest conservation activities covering an area ten times the size of the construction area for DIGGLE’s office.

*1 The "team green" advanced environmental partnership is a co-creative partnership where Tokyu Land and tenant companies that support environmental conservation activities work together to solve environmental issues and create value. Please refer to the news release dated March 24, 2026 (https://www.tokyu-land.co.jp/news/2026/001682.html).

4.7 Tons of CO2 Emissions Reduced Through Horizontal Recycling of Interior Materials via Co-Creation

During the fit-out construction for DIGGLE, conducted between October 2025 and February 2026, the project pioneered industry-leading "horizontal recycling" by adopting recycled interior materials (recycled gypsum board and recycled carpet tiles) manufactured from reclaimed materials.

Because recycled interior materials are produced using material recycling methods from discarded materials, the processes of mining, processing, transporting, and manufacturing raw materials are reduced, which has the effect of suppressing CO2 emissions generated during the manufacturing process. This construction project reduced CO2 emissions by approximately 4,697 kg*2.

Furthermore, Tokyu Land is engaged in an initiative to conserve forests in areas proportional to the actions of its stakeholders. As part of the "team green" environmental measures, the adoption of recycled interior materials in this project led to the conservation of 4,633 square meters of forest in Nishiawakura Village, Okayama Prefecture—an area ten times the size of the construction site for DIGGLE’s office. This contributes to the protection of biodiversity and the maintenance of sustainable local natural environments.

*2 The "CO2 emission reduction" is calculated based on comparison values with conventional products provided by the manufacturers.

◇ Environmentally Friendly Recycled Interior Materials Adopted by DIGGLE

Creating Offices Kind to Forests and the Earth

Tokyu Land promotes "Creating offices kind to forests and the earth" as a concept for sustainable office development aimed at reducing environmental impact. Through horizontal recycling implemented with co-creation partners—including industrial waste disposal companies, interior material manufacturers, and tenant companies—it is possible to significantly reduce waste and CO2 emissions by appropriately utilizing waste generated from office construction. Tenant companies can also address environmental issues without compromising design quality or incurring additional cost burdens.

To date, in office buildings operated by Tokyu Land, efforts have primarily focused on waste reduction through the "Zero Emission Club®"*3, which consists of partner companies. As a further environmental contribution measure, the company is utilizing material recycling and resource recovery to promote recycling and resource circulation. The goal is to pursue sustainable initiatives in office construction that aim to build a sustainable circular society and reduce CO2 emissions.

[Specific Process] ① Waste generated from office construction is collected by GMS Co., Ltd. ② Collected waste is manually sorted, and recyclable items are transported to co-creation partner manufacturers. ③ The manufacturers process the waste into recycled materials using material recycling technology. ④ The recycled materials are repurposed by the co-creation manufacturers into environmentally friendly interior materials such as "recycled gypsum board" and "recycled carpet tiles." ⑤ Tokyu Land proposes these environmentally friendly recycled interior materials for tenant fit-out construction, and the tenant adopts them.

Through this initiative, CO2 emissions generated during fit-out construction are reduced through the adoption of recycled materials, and waste recycling is promoted. Additionally, an environmental contribution report quantifying CO2 reduction and recycling ratios is issued and provided to the tenant.

*3 The "Zero Emission Club®" is a collaborative system composed of Tokyu Land and partner companies, including manufacturers and construction firms, to promote the reduction, resource recovery, and recycling of construction waste. Please refer to the news releases dated January 31, 2023 (https://www.tokyu-land.co.jp/news/2023/000823.html) and December 12, 2023 (https://www.tokyu-land.co.jp/news/2023/001125.html).

Building a Circular Society Aimed at by the "Zero Emission Club®"

The mission of the "Zero Emission Club®," composed of Tokyu Land and its partner manufacturers and construction companies, is to achieve a sustainable circular society. By promoting the reduction, resource recovery, and recycling of construction waste, the club aims to balance environmental impact reduction with the continuation of business activities while effectively utilizing limited resources. Together with tenant companies like DIGGLE, the club aims to simultaneously pursue environmental conservation activities and the enhancement of corporate value.

Moving forward, we will continue to expand our lineup of environmentally friendly recycled interior materials and promote their active adoption. This will sustainably increase the asset value of our buildings and the city as a whole, while also leading to improved satisfaction and experiential value for our tenants and users. By co-creating with diverse partners, including tenant companies and collaborative manufacturers, we will actively work to create high added value through the construction of a circular society, ensuring that cities and lifestyles become more sustainable and prosperous.

About DIGGLE Inc.

[Comment from CTO Shun Mizukami] "As an IT company, it has structurally been difficult for us to find opportunities to make a direct contribution to the environment. I am pleased that by adopting environmentally friendly recycled interior materials this time, we have been able to make a modest contribution to reducing CO2 emissions and realizing a circular society. I believe that each of these small steps leads to the embodiment of 'Integrity,' a value that DIGGLE cherishes and has established as one of our core values."

[Company Introduction] With the mission of "Dig the Potential: Unearthing corporate growth potential through technology," DIGGLE develops and provides multiple products that realize optimal resource allocation of "people, goods, and money," including "DIGGLE Budgeting & Forecasting," which supports strategic investment decisions for management resources. With the corporate vision of "Becoming the artery of management—circulating numbers and intentions throughout the organization to move the future," the company contributes to corporate growth as a leader in the management administration market, which is expected to grow in the future.

DIGGLE began a project to obtain B Corp certification in November 2025. B Corp certification is granted by the U.S. non-profit organization "B Lab™" to companies with high public interest that are considerate of the environment and society. It is a movement to create a better society through business, and a mechanism to be recognized by society as a "Social Good Company" (a company that has a positive impact on the environment and local communities).

◇ B Corp Certification Process: https://note.com/diggle/m/meaee1532bb97 ◇ Official Website: https://diggle.jp/company/about/

About Tokyu Land Corporation

As an environmentally advanced company, Tokyu Land is engaged in environmental initiatives aligned with its business, such as RE100 certification and renewable energy projects. To aim for office buildings and commercial facilities that are "chosen for their environment," the company has established the "Zero Emission Club®" with 25 partner companies for the purpose of waste reduction and recycling, carries out ZEB-oriented renovation work on difficult-to-renovate existing multi-tenant buildings, and creates opportunities for interaction through rooftop garden activities. Additionally, the company is working on the "GREEN UP & COOL DOWN PROJECT"*4 to promote nature positivity. We will continue to promote initiatives toward environmental issues while collaborating with various stakeholders, aiming to expand business opportunities through co-creation.

◇ Official Website: https://www.tokyu-land.co.jp/

*4 The "GREEN UP & COOL DOWN PROJECT" is a project aimed at creating an urban environment where everyone can live vibrantly through the conservation of biodiversity and urban greening in the Greater Shibuya area. (https://www.greenup-cooldown.jp/)