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Otemachi Tower: A Green Beacon in Urban Landscape

In the heart of Tokyo's bustling business district lies a remarkable example of urban eco-consciousness: Otemachi Tower. Recently, this architectural masterpiece was awarded the top honor, the Minister of Land, Infrastructure, Transport and Tourism Award, at the 6th Green Infrastructure Awards. This recognition applauds the tower's ongoing commitment to reviving urban nature, a journey that spans over a decade of ecological innovation.

A Legacy of Green Infrastructure

The Green Infrastructure Awards, initiated in 2020 by the Green Infrastructure Public-Private Partnership Platform, celebrate exemplary initiatives in the realm of green infrastructure. Otemachi Tower stands out not only for its impressive structure but also for its dedication to creating urban green spaces, notably the 3,600 square meters of green public area known as "Otemachi no Mori" or Otemachi Forest. This urban oasis covers roughly one-third of the tower's site, offering a refreshing environment for both locals and visitors.

Since its opening in August 2013, the tower has maintained a commitment to conserve and manage its green area as a genuine forest. Events that leverage the comfort of this environment are held monthly, fostering a connection to nature for nearby office workers and visitors alike. Its open pathways and vibrant events have played a vital role in enhancing the visitor experience, key factors that contributed to this prestigious award.

The Vision of Otemachi no Mori

Otemachi no Mori is not your ordinary urban park; it embodies a philosophy of nurturing nature within the city. The landscape has been cultivated using a technique known as "pre-forest," where trees and plants grown over three years in forests located in Chiba Prefecture were transplanted to coincide with the tower's completion. This meticulous management style aims to emulate a natural forest, which has also helped in forming an ecological network that includes the adjacent Imperial Palace Gardens.

The impact of Otemachi Forest goes beyond aesthetics. It has contributed to a significant temperature reduction, mitigating the urban heat island effect with an average drop of 1.7°C compared to pre-development levels. The forest serves as a retreat for city dwellers, transforming the concrete jungle into a genuine haven of tranquility.

Additionally, the design incorporates advanced water management techniques, allowing rainwater to be temporarily stored and reused for irrigation, thereby reducing the risk of flooding during heavy rains.

Biodiversity at Otemachi

Biodiversity thrives in this urban green space. The number of plant species has increased dramatically from 107 in 2013 to 208 by 2021, adapting to the area's environmental shifts. Rare species such as Shiroyamabuki and Yamabukiso, listed in national and Tokyo's red lists, are now part of this thriving ecosystem. Insects and birds also find a home here, with 129 types of insects and 13 bird species, including the majestic Ootaka and Hayabusa, being observed since the forest's inception.

Enhancing Well-Being Through Nature

Recognizing the psychological benefits of green spaces, Otemachi Tower hosts various events aimed at enhancing the well-being of its visitors. Initiatives like "FIKA" offer a Swedish-inspired break in nature, featuring seasonal activities such as baked sweet potatoes and nature workshops. Similarly, the "Mori no Ichi" (Forest Market) provides an ethical marketplace, bringing together natural products and unique cocktails inspired by the forest.

The scientific community is also taking notice; a joint study by Tokyo Tatemono and the National Institute for Forest Science is underway to analyze how urban greenery impacts the well-being of city workers. The research includes measuring stress hormones and conducting psychological surveys to understand the health benefits derived from green spaces like Otemachi no Mori.

Recognition and Awards

The accolades received by Otemachi Tower and Otemachi no Mori highlight their exceptional standards in green infrastructure and urban landscapes. Some notable recognitions include:

• - 2013: DBJ Green Building Certification (Platinum)
• - 2014: First certification from ABINC for urban biodiversity
• - 2015: Minister of Land Award for Urban Park Competition
• - 2023: First certification as a Natural Coexistence Site by the Ministry of the Environment

Conclusion

Otemachi Tower and its surrounding forest are not just exemplary models of urban development; they represent a forward-thinking approach to integrating natural environments into city landscapes. As Tokyo continues to grow, such projects encourage a sustainable future, proving that even in urban settings, nature can thrive.

For visitors and urban professionals alike, Otemachi no Mori provides a place to reconnect with nature and experience the benefits of biodiversity and sustainability in the heart of Japan’s capital city.