Tokyo Square Garden "Kyobashi Hill" Promotes Coexistence with Wild Birds: Installation of Regenerative "Kyobashi Nest" Using Recycled Waste Materials, Featuring a Viewing Exhibit to Observe Nest Interior via Live Camera

Tokyo Tatemono Co., Ltd. and Hakuten Inc. are pleased to announce the installation of "Kyobashi Nests," made from recycled pruned branches, dead leaves, and building-derived waste materials, in the "Kyobashi Hill" multi-use green space at Tokyo Square Garden (Chuo-ku, Tokyo), owned and managed by Tokyo Tatemono and others, effective April 2, 2026. The "Kyobashi Nest" installation project (hereinafter referred to as "the Project") aims to support wild bird nesting and provide an urban experience of coexistence with nature by incorporating a live viewing function that allows real-time observation of the nest's interior. The "Kyobashi Nest" is created using eggshells as a base, along with pruned branches generated from the "Kyobashi Hill" planting maintenance work and waste materials such as pruned logs from the management work of "Otemachi Forest," a green space on the premises of "Otemachi Tower" (Chiyoda-ku, Tokyo). Utilizing digital manufacturing technologies like 3D printers, it is woven like a bird's nest. Two types of designs are being developed, pursuing structures where wild birds can nest safely, such as an egg-shaped form that harmonizes with the wood grain and a shape that naturally rises from logs. Additionally, a "nesting material stand" will be installed to provide materials for wild birds' nests, offering waste materials from events held at Tokyo Square Garden. The nest box incorporates a live camera, allowing observation from a live view monitor of what materials birds choose and how they form their nests. This provides urban dwellers with an opportunity to feel the rhythms of nature in their daily lives and deepen their understanding of ecosystems and circular resource utilization. This Project aims to contribute to regenerative ecosystem cycles by giving new life to waste materials that have served their purpose, preparing and watching over the living environment for wild birds in urban areas. ## Background of the Project Tokyo Square Garden is a large-scale complex building with excellent access, directly connected to "Kyobashi" Station on the Tokyo Metro Ginza Line, and within walking distance of JR "Tokyo" Station and the Ginza area. Despite this, it features a multi-layered green space, "Kyobashi Hill," spanning approximately 3,000m² with a height of about 31m from B1 to the 5th floor, adorned with plantings that display beautiful colors throughout the seasons. Its environmental conservation efforts, prioritizing biodiversity, have been highly acclaimed, earning numerous certifications and awards, including the "Certified Business for Biodiversity Conservation® (ABINC Certification). This Project aims to circulate materials that would otherwise be discarded as new value by creating nest boxes using recycled waste materials generated from "Kyobashi Hill" and other areas within this urban space that offers a rich natural feel. Furthermore, by establishing an environment where visitors can observe the selection of nesting materials and the nesting process, it fosters a consciousness of coexistence with nature among urban residents, promoting awareness and behavioral changes towards a regenerative society. ## Features of the "Kyobashi Nest" ### 1. Regenerative Nest Structure Circulating Natural Materials The two types of "Kyobashi Nests" produced and installed in this Project are formed using 3D printers, utilizing waste materials such as pruned branches, dead leaves, fabric scraps, and building material offcuts as recycled resources. By crushing and pelletizing the materials, a natural texture that harmonizes with the wood grain is achieved. Simultaneously, the internal structure is designed to prevent rainwater intrusion and ensure ventilation, creating a comfortable environment where wild birds can live safely. The diversity of the materials themselves imbues each nest box with individuality, symbolizing urban circulation. * **Cocoon Nest** A nest box with an organic form reminiscent of a "small life's egg" gently resting against the wood grain. Inspired by the oval cocoons of insects found on trees, this design offers a robust structure with smooth curves to smoothly deflect wind and rain. Furthermore, by raising the internal floor, ventilation is maintained, creating a comfortable space where rainwater is less likely to penetrate. We pray that small birds will hatch and take flight from the Cocoon nest. * **Growing Nest** This nest box utilizes pruned logs from "Otemachi Forest," a green space spanning about one-third of the Otemachi Tower's premises, making it appear as if the tree itself has naturally grown and formed. By completely integrating with the surrounding trees and blending into the landscape, it serves as camouflage, safely protecting small birds from predators. ### 2. Live Viewing to Observe Nesting in Real-Time A small live camera is built inside the "Kyobashi Nest" to enable real-time observation of the materials birds use for nest building and their nesting process. Through monitors installed in the office entrance, visitors can witness the activities of nature up close while in an urban space. By visualizing the nesting process like a "show window," the aim is to promote understanding of biodiversity and raise awareness of nature conservation. ### 3. Installation of "Nesting Material Stand" to Support Urban Ecosystems Birds build nests not only with twigs and leaves but also by utilizing diverse materials present in human living spaces. This Project installs a nesting material stand that collects biodegradable materials such as scraps from events at Tokyo Square Garden and waste materials from buildings, allowing birds to select natural and urban-derived materials. This supports the process of fostering a rich ecosystem within the city, where what is unnecessary for humans becomes a vital part of the birds' "home," creating a place for deeper understanding of bird ecology. ## Installation Overview of "Kyobashi Nest" | Name | Kyobashi Nest | | :----------------- | :---------------------------------------------------------------------------------------------------------- | | Location | Tokyo Square Garden, Kyobashi Hill 3F
(3-1-1 Kyobashi, Chuo-ku, Tokyo / Tokyo Square Garden 3F) | | Access | Directly connected to Kyobashi Station (Tokyo Metro Ginza Line)
2 min walk to Ginza-Itchome Station (Tokyo Metro Yurakucho Line)
2 min walk to Takaracho Station (Toei Asakusa Line)
6 min walk to Tokyo Station (JR)
6 min walk to Yurakucho Station (JR) | | Installation Date | April 2, 2026 | | Installing Body | Tokyo Tatemono Co., Ltd. | | Planning/Produce/Manufacture | Hakuten Inc. | | Production Cooperation | Koshin Planning Co., Ltd. | | Supervision | The Wild Bird Society of Japan | | Official Website | https://tokyo-sg.com/ | ## Comments from The Wild Bird Society of Japan (Original Text) Tokyo Square Garden is abundant with planted trees and wall greenery, creating an environment around the low-rise floors up to the 3rd floor that is rarely seen in large cities. Especially on the 3rd floor's Kyobashi Hill, there is a green rooftop terrace and a large water basin on the south side, where several types of birds constantly gather, making it a bird oasis. This new challenge at this location is to "prepare nesting conditions for Japanese Tits." Based on our past experience, we discussed how best to install the nest box and what nesting necessities are currently lacking here to create a construction plan. While hoping that Japanese Tits will take a liking to the somewhat unusual Kyobashi Nest, we will also be watching over it. ## Tokyo Tatemono's Initiatives on Regeneration In recent years, issues surrounding the global and social environment have become increasingly severe, with the impacts of climate change intensifying. Amidst this situation, a new concept is spreading internationally: not just "sustainability," but the regeneration of nature and society to create a better future. Against this backdrop, Tokyo Tatemono announced the "Regenerative City Tokyo" concept at the international conference "RegenerAction Japan 2024" in November 2024*1. Subsequently, at "RegenerAction Japan 2025" in October 2025, it released the "Regenerative Cities Manifesto" outlining the vision for a Regenerative City*2, and launched "REGENE," an owned media platform introducing regenerative initiatives both domestically and internationally. Through these efforts, we aim to create a global movement beyond single organizations and realize a regenerative world from Tokyo. *1 Related Release: