TENTO is a shared office built with thinning trees in Yamakita machi, the westernmost part of Kanagawa Prefecture. It is located in the shared workplace “mass × mass*” in Naka-Ku, Yokohama City.

The name “TENTO” means the place where entrepreneurs attempting to solve social problems through business methods can gather. They eat, exchange information, and socialize together in a mountain lodge, TENTO.

One of the features of TENTO is that the booths are made of locally grown thinned wood. Wouldn’t it be nice to save the forest and the water in the local area by working in Yokohama? To keep the forest healthy and maintain vital water sources, the TENTO office is made of thinning trees in Yamakita machi, which is the source of Yokohama’s water.

The residents of the office can visit Yamakita machi too. By stepping into the forest, they will be able to inspirations for new ideas and interact with other shared office residents through events such as camping and barbecues.

As of 2021, there is another TENTO base in Numazu City, Shizuoka Prefecture, called “Numashin COMPASS | TENTO Numazu,” built with the nearest thinned wood in Mt. Shidaka as well.

*mass × mass (Kannai Future Center) is a shared workplace operated by Kannai Innovation Initiative Co.. It functions as a community platform with co-working space and workshop studio all in one.

What Makes the Project Circular

1. Reforestation through the use of thinning wood

Thinning is essential for maintaining a healthy forest environment. By allowing adequate sunlight into the forest, plants can grow in the understory, and an appropriate density of trees can be maintained. TENTO effectively utilizes waste wood in Yamakita-machi and conserves and regenerates forest resources to preserve the water source.

2.Minimizing and reusing the materials

TENTO booths are made from thinning wood which is cut into boards of the exact dimensions. You can quickly build a wall by inserting a few planks of lumber into steel racks set up in the four corners without using nails. It has a characteristic of circular design that the boards can be used without making holes, so they can be reused to make new product after use.

3. Creating new links with other people through the office

TENTO is designed to loosely connect with other residents but also allows to have their own space at the same time. Sharing the space with other people creates opportunities for communication and stimulation for innovations. In addition, TENTO will enable people to connect to other areas in the prefecture, such as Yokohama and Yamakita machi, and it creates an opportunity to visit different places. TENTO gives good opportunities to engage with residents and to solve local problems.

Project Overview

Organization MASS2SQUARE Inc.
Category Waste reduction、Reforestation、Shared office
Introduced 2015
Address 33 1F/2F, Kitanakadory 3-Chome,
Naka-Ku, Yokohama,Kanagawa 231-0003
URL https://massmass.jp/price/tent-office/
Contact Email:info@massmass.jp


Craft Beer Paper

Craft beer paper is a recycled paper made from malt waste. kitafuku Inc. works with local breweries and restaurants to turn waste into valuable paper products to achieve up-cycling.

Zero Ring

A project to circulate takeout bento boxes in the Minato Mirai area. It aims to solve the problem of disposable containers waste by reusing takeout containers and make mealtime fancy and enjoyable.


Aquaponics is a system of "circular organic agriculture" that crosses hydroponics and aquaculture. It minimizes resource circulation and promotes local consumption to rvitalize local communities.


Coco&K. imports lovely, eco-minded, fairtrade bags from the Philippines. The products are up-cycled from discarded aluminum juice packages. It helps the locals live independently and keeps the environment clean.


Ikasa is an umbrella sharing service that allows users to borrow and return umbrellas at the umbrella spots quickly. Ikasa's umbrellas are durable and repairable, which helps to reduce the number of disposable umbrellas.

Web Iikamo Ichi

Web Iikamo Ichi is a web platform that offers a monthly marché online. You can find many Yokohama-made sustainable groceries and other products.


“ZERO PC” is the computer upcycling project led by People Port Inc trying to make the environmental impact by their business zero and supporting domestic refugees and poor children.

Yokohama Blue Carbon

Yokohama City, as “SDGs Future City,” leads the Yokohama Blue Carbon Project. It works on utilizing ocean resources and regenerating marine ecosystems and the local Fishing Industry.

Kawamura Laboratory (Yokohama National University)

Izuru Kawamura and Noriko Kanai team, Yokohama National university, successfully derives cellulose nanofibers from spent coffee grounds(SCGs). This study shows that SCGs cellulose nanofibers can be used as alternative resources and will potentially contribute to the development of sustainability.

The Yokohama Reuse Bin Project

The project is to produce the Yokohama-exclusive beverage and reusable glass bottles in Yokohama. It conceives the regional circle of the bottles and the local consumption of the juice and approaches environmental issues as well as supports the local communities.

The Eco Picture Diary

Environmental journal Project is to encourage children to be aware of environmental issues and its solutions through making a poster. The project is held every summer to help create new circular businesses in Yokohama.

Food Bank Yokohama

Food Bank Yokohama is a non profit organization that collects the food that would not be used or would be discarded along the food supply chain and distributes it to homeless people and welfare facilities in Yokohama.

The Jellyfish Laboratory

Jellyfish Research Laboratory is a social biotech startup located in Tsurumi-ku, Yokohama from Institute of Physical and Chemical Research. They work on improving biodiversity, marine conservation and life science by utilizing jellyfish.

Yokoyoko Project

Yokoyoko Project is a project which intends to provide renewable electricity generated in Yokohama-cho, Aomori to the companies in Yokohama city, Kanagawa. With the system of blockchain which is provided by Minna-Denryoku, Inc., the project make it possible to certify where the electricity came from.

The WE shop

The WE shop is a charity shop based on donation and volunteers run by WE21 Japan in Naka ward, Yokohama. There are several locations and are functioning as a community space where diverse people living in the community get together and make connections as well.

The Circular Economy Plus T-shirt

The Circular Economy Plus T-shirt Project aims to make sustainable T-shirts using waste plastic bottles discarded in the area. The project is initiated by the Yokohama branch of NPO greenbird, Japan Environment Planning Inc., Okawa Printing Co., Ltd., and a designer from Yokohama.

The Kanagawa Up Cycle Consortium

The Kanagawa Up Cycle Consortium is established in collaboration with Kanagawa Prefecture and TBM Co., Ltd. that develops, manufactures and sells a new material “LIMEX.” The aim is to promote a circular economy through up-cycling that utilizes LIMEX and to realize a circular town development.

Nite hi WORKS

"Nite hi WORKS" is an art project by artist Minoru Inayoshi and actor Azusa Watanabe. The concept is "changing something from the original to something now" by unexpectedly and freely adding different languages ​​(ideas) from different eras, cultures and many other things "different."

Fab lab Kannai

Fab Lab Kannai is a manufacturing laboratory for citizens in Kannai, Yokohama. It functions as a local manufacturing base, cooperating with co-working spaces in the area for start-up companies, and developing business labs in local community spaces as there are several 3D printers, sewing machines and laser cutters inside.


"reBirth" is a project to transform discarded ocean plastic into beautiful traditional crafts. The project produces beautiful molded plates while mixing different types and colors of plastic materials. The idea was created by “Plas+tech project” which is led by Techno Labo Co., Ltd.

Y-Wai Hiroba

Y-Wai Hiroba is a community space and shared office created by renovating a vacant house in Isogo ward, Yokohama.The first floor is a community space where locals can get together and hold meetings, and the second floor is a shared office that welcomes local businesses. The space can be a local shelter in case of emergency.

SDGs Yokohama Kanazawa Living Lab

SDGs Yokohama Kanazawa Living Lab works on the circular economic agriculture project which makes use of the eelgrass (seaweed that grows in the sea) as fertilizer, grows vegetables such as chili at local farms and creates a unique seasoning by associating with a local elementary school.

Yokohama Wood Straw Project

The project produces wooden straws made of wood thinned from the water source forest in Doshi Village, Yamanashi Prefecture, which supplies water with citizens in Yokohama and those straws are handmade by people with disabilities Yokohama.